#include "builtin.h" #include "alloc.h" #include "hex.h" #include "repository.h" #include "config.h" #include "attr.h" #include "object.h" #include "blob.h" #include "commit.h" #include "tag.h" #include "tree.h" #include "delta.h" #include "pack.h" #include "pack-revindex.h" #include "csum-file.h" #include "tree-walk.h" #include "diff.h" #include "revision.h" #include "list-objects.h" #include "list-objects-filter.h" #include "list-objects-filter-options.h" #include "pack-objects.h" #include "progress.h" #include "refs.h" #include "streaming.h" #include "thread-utils.h" #include "pack-bitmap.h" #include "delta-islands.h" #include "reachable.h" #include "oid-array.h" #include "strvec.h" #include "list.h" #include "packfile.h" #include "object-store.h" #include "replace-object.h" #include "dir.h" #include "midx.h" #include "trace2.h" #include "shallow.h" #include "promisor-remote.h" #include "pack-mtimes.h" /* * Objects we are going to pack are collected in the `to_pack` structure. * It contains an array (dynamically expanded) of the object data, and a map * that can resolve SHA1s to their position in the array. */ static struct packing_data to_pack; static inline struct object_entry *oe_delta( const struct packing_data *pack, const struct object_entry *e) { if (!e->delta_idx) return NULL; if (e->ext_base) return &pack->ext_bases[e->delta_idx - 1]; else return &pack->objects[e->delta_idx - 1]; } static inline unsigned long oe_delta_size(struct packing_data *pack, const struct object_entry *e) { if (e->delta_size_valid) return e->delta_size_; /* * pack->delta_size[] can't be NULL because oe_set_delta_size() * must have been called when a new delta is saved with * oe_set_delta(). * If oe_delta() returns NULL (i.e. default state, which means * delta_size_valid is also false), then the caller must never * call oe_delta_size(). */ return pack->delta_size[e - pack->objects]; } unsigned long oe_get_size_slow(struct packing_data *pack, const struct object_entry *e); static inline unsigned long oe_size(struct packing_data *pack, const struct object_entry *e) { if (e->size_valid) return e->size_; return oe_get_size_slow(pack, e); } static inline void oe_set_delta(struct packing_data *pack, struct object_entry *e, struct object_entry *delta) { if (delta) e->delta_idx = (delta - pack->objects) + 1; else e->delta_idx = 0; } static inline struct object_entry *oe_delta_sibling( const struct packing_data *pack, const struct object_entry *e) { if (e->delta_sibling_idx) return &pack->objects[e->delta_sibling_idx - 1]; return NULL; } static inline struct object_entry *oe_delta_child( const struct packing_data *pack, const struct object_entry *e) { if (e->delta_child_idx) return &pack->objects[e->delta_child_idx - 1]; return NULL; } static inline void oe_set_delta_child(struct packing_data *pack, struct object_entry *e, struct object_entry *delta) { if (delta) e->delta_child_idx = (delta - pack->objects) + 1; else e->delta_child_idx = 0; } static inline void oe_set_delta_sibling(struct packing_data *pack, struct object_entry *e, struct object_entry *delta) { if (delta) e->delta_sibling_idx = (delta - pack->objects) + 1; else e->delta_sibling_idx = 0; } static inline void oe_set_size(struct packing_data *pack, struct object_entry *e, unsigned long size) { if (size < pack->oe_size_limit) { e->size_ = size; e->size_valid = 1; } else { e->size_valid = 0; if (oe_get_size_slow(pack, e) != size) BUG("'size' is supposed to be the object size!"); } } static inline void oe_set_delta_size(struct packing_data *pack, struct object_entry *e, unsigned long size) { if (size < pack->oe_delta_size_limit) { e->delta_size_ = size; e->delta_size_valid = 1; } else { packing_data_lock(pack); if (!pack->delta_size) ALLOC_ARRAY(pack->delta_size, pack->nr_alloc); packing_data_unlock(pack); pack->delta_size[e - pack->objects] = size; e->delta_size_valid = 0; } } #define IN_PACK(obj) oe_in_pack(&to_pack, obj) #define SIZE(obj) oe_size(&to_pack, obj) #define SET_SIZE(obj,size) oe_set_size(&to_pack, obj, size) #define DELTA_SIZE(obj) oe_delta_size(&to_pack, obj) #define DELTA(obj) oe_delta(&to_pack, obj) #define DELTA_CHILD(obj) oe_delta_child(&to_pack, obj) #define DELTA_SIBLING(obj) oe_delta_sibling(&to_pack, obj) #define SET_DELTA(obj, val) oe_set_delta(&to_pack, obj, val) #define SET_DELTA_EXT(obj, oid) oe_set_delta_ext(&to_pack, obj, oid) #define SET_DELTA_SIZE(obj, val) oe_set_delta_size(&to_pack, obj, val) #define SET_DELTA_CHILD(obj, val) oe_set_delta_child(&to_pack, obj, val) #define SET_DELTA_SIBLING(obj, val) oe_set_delta_sibling(&to_pack, obj, val) static const char *pack_usage[] = { N_("git pack-objects --stdout [] [< | < ]"), N_("git pack-objects [] [< | < ]"), NULL }; static struct pack_idx_entry **written_list; static uint32_t nr_result, nr_written, nr_seen; static struct bitmap_index *bitmap_git; static uint32_t write_layer; static int non_empty; static int reuse_delta = 1, reuse_object = 1; static int keep_unreachable, unpack_unreachable, include_tag; static timestamp_t unpack_unreachable_expiration; static int pack_loose_unreachable; static int cruft; static timestamp_t cruft_expiration; static int local; static int have_non_local_packs; static int incremental; static int ignore_packed_keep_on_disk; static int ignore_packed_keep_in_core; static int allow_ofs_delta; static struct pack_idx_option pack_idx_opts; static const char *base_name; static int progress = 1; static int window = 10; static unsigned long pack_size_limit; static int depth = 50; static int delta_search_threads; static int pack_to_stdout; static int sparse; static int thin; static int num_preferred_base; static struct progress *progress_state; static struct packed_git *reuse_packfile; static uint32_t reuse_packfile_objects; static struct bitmap *reuse_packfile_bitmap; static int use_bitmap_index_default = 1; static int use_bitmap_index = -1; static int allow_pack_reuse = 1; static enum { WRITE_BITMAP_FALSE = 0, WRITE_BITMAP_QUIET, WRITE_BITMAP_TRUE, } write_bitmap_index; static uint16_t write_bitmap_options = BITMAP_OPT_HASH_CACHE; static int exclude_promisor_objects; static int use_delta_islands; static unsigned long delta_cache_size = 0; static unsigned long max_delta_cache_size = DEFAULT_DELTA_CACHE_SIZE; static unsigned long cache_max_small_delta_size = 1000; static unsigned long window_memory_limit = 0; static struct string_list uri_protocols = STRING_LIST_INIT_NODUP; enum missing_action { MA_ERROR = 0, /* fail if any missing objects are encountered */ MA_ALLOW_ANY, /* silently allow ALL missing objects */ MA_ALLOW_PROMISOR, /* silently allow all missing PROMISOR objects */ }; static enum missing_action arg_missing_action; static show_object_fn fn_show_object; struct configured_exclusion { struct oidmap_entry e; char *pack_hash_hex; char *uri; }; static struct oidmap configured_exclusions; static struct oidset excluded_by_config; /* * stats */ static uint32_t written, written_delta; static uint32_t reused, reused_delta; /* * Indexed commits */ static struct commit **indexed_commits; static unsigned int indexed_commits_nr; static unsigned int indexed_commits_alloc; static void index_commit_for_bitmap(struct commit *commit) { if (indexed_commits_nr >= indexed_commits_alloc) { indexed_commits_alloc = (indexed_commits_alloc + 32) * 2; REALLOC_ARRAY(indexed_commits, indexed_commits_alloc); } indexed_commits[indexed_commits_nr++] = commit; } static void *get_delta(struct object_entry *entry) { unsigned long size, base_size, delta_size; void *buf, *base_buf, *delta_buf; enum object_type type; buf = read_object_file(&entry->idx.oid, &type, &size); if (!buf) die(_("unable to read %s"), oid_to_hex(&entry->idx.oid)); base_buf = read_object_file(&DELTA(entry)->idx.oid, &type, &base_size); if (!base_buf) die("unable to read %s", oid_to_hex(&DELTA(entry)->idx.oid)); delta_buf = diff_delta(base_buf, base_size, buf, size, &delta_size, 0); /* * We successfully computed this delta once but dropped it for * memory reasons. Something is very wrong if this time we * recompute and create a different delta. */ if (!delta_buf || delta_size != DELTA_SIZE(entry)) BUG("delta size changed"); free(buf); free(base_buf); return delta_buf; } static unsigned long do_compress(void **pptr, unsigned long size) { git_zstream stream; void *in, *out; unsigned long maxsize; git_deflate_init(&stream, pack_compression_level); maxsize = git_deflate_bound(&stream, size); in = *pptr; out = xmalloc(maxsize); *pptr = out; stream.next_in = in; stream.avail_in = size; stream.next_out = out; stream.avail_out = maxsize; while (git_deflate(&stream, Z_FINISH) == Z_OK) ; /* nothing */ git_deflate_end(&stream); free(in); return stream.total_out; } static unsigned long write_large_blob_data(struct git_istream *st, struct hashfile *f, const struct object_id *oid) { git_zstream stream; unsigned char ibuf[1024 * 16]; unsigned char obuf[1024 * 16]; unsigned long olen = 0; git_deflate_init(&stream, pack_compression_level); for (;;) { ssize_t readlen; int zret = Z_OK; readlen = read_istream(st, ibuf, sizeof(ibuf)); if (readlen == -1) die(_("unable to read %s"), oid_to_hex(oid)); stream.next_in = ibuf; stream.avail_in = readlen; while ((stream.avail_in || readlen == 0) && (zret == Z_OK || zret == Z_BUF_ERROR)) { stream.next_out = obuf; stream.avail_out = sizeof(obuf); zret = git_deflate(&stream, readlen ? 0 : Z_FINISH); hashwrite(f, obuf, stream.next_out - obuf); olen += stream.next_out - obuf; } if (stream.avail_in) die(_("deflate error (%d)"), zret); if (readlen == 0) { if (zret != Z_STREAM_END) die(_("deflate error (%d)"), zret); break; } } git_deflate_end(&stream); return olen; } /* * we are going to reuse the existing object data as is. make * sure it is not corrupt. */ static int check_pack_inflate(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned long expect) { git_zstream stream; unsigned char fakebuf[4096], *in; int st; memset(&stream, 0, sizeof(stream)); git_inflate_init(&stream); do { in = use_pack(p, w_curs, offset, &stream.avail_in); stream.next_in = in; stream.next_out = fakebuf; stream.avail_out = sizeof(fakebuf); st = git_inflate(&stream, Z_FINISH); offset += stream.next_in - in; } while (st == Z_OK || st == Z_BUF_ERROR); git_inflate_end(&stream); return (st == Z_STREAM_END && stream.total_out == expect && stream.total_in == len) ? 0 : -1; } static void copy_pack_data(struct hashfile *f, struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len) { unsigned char *in; unsigned long avail; while (len) { in = use_pack(p, w_curs, offset, &avail); if (avail > len) avail = (unsigned long)len; hashwrite(f, in, avail); offset += avail; len -= avail; } } static inline int oe_size_greater_than(struct packing_data *pack, const struct object_entry *lhs, unsigned long rhs) { if (lhs->size_valid) return lhs->size_ > rhs; if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */ return 1; return oe_get_size_slow(pack, lhs) > rhs; } /* Return 0 if we will bust the pack-size limit */ static unsigned long write_no_reuse_object(struct hashfile *f, struct object_entry *entry, unsigned long limit, int usable_delta) { unsigned long size, datalen; unsigned char header[MAX_PACK_OBJECT_HEADER], dheader[MAX_PACK_OBJECT_HEADER]; unsigned hdrlen; enum object_type type; void *buf; struct git_istream *st = NULL; const unsigned hashsz = the_hash_algo->rawsz; if (!usable_delta) { if (oe_type(entry) == OBJ_BLOB && oe_size_greater_than(&to_pack, entry, big_file_threshold) && (st = open_istream(the_repository, &entry->idx.oid, &type, &size, NULL)) != NULL) buf = NULL; else { buf = read_object_file(&entry->idx.oid, &type, &size); if (!buf) die(_("unable to read %s"), oid_to_hex(&entry->idx.oid)); } /* * make sure no cached delta data remains from a * previous attempt before a pack split occurred. */ FREE_AND_NULL(entry->delta_data); entry->z_delta_size = 0; } else if (entry->delta_data) { size = DELTA_SIZE(entry); buf = entry->delta_data; entry->delta_data = NULL; type = (allow_ofs_delta && DELTA(entry)->idx.offset) ? OBJ_OFS_DELTA : OBJ_REF_DELTA; } else { buf = get_delta(entry); size = DELTA_SIZE(entry); type = (allow_ofs_delta && DELTA(entry)->idx.offset) ? OBJ_OFS_DELTA : OBJ_REF_DELTA; } if (st) /* large blob case, just assume we don't compress well */ datalen = size; else if (entry->z_delta_size) datalen = entry->z_delta_size; else datalen = do_compress(&buf, size); /* * The object header is a byte of 'type' followed by zero or * more bytes of length. */ hdrlen = encode_in_pack_object_header(header, sizeof(header), type, size); if (type == OBJ_OFS_DELTA) { /* * Deltas with relative base contain an additional * encoding of the relative offset for the delta * base from this object's position in the pack. */ off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset; unsigned pos = sizeof(dheader) - 1; dheader[pos] = ofs & 127; while (ofs >>= 7) dheader[--pos] = 128 | (--ofs & 127); if (limit && hdrlen + sizeof(dheader) - pos + datalen + hashsz >= limit) { if (st) close_istream(st); free(buf); return 0; } hashwrite(f, header, hdrlen); hashwrite(f, dheader + pos, sizeof(dheader) - pos); hdrlen += sizeof(dheader) - pos; } else if (type == OBJ_REF_DELTA) { /* * Deltas with a base reference contain * additional bytes for the base object ID. */ if (limit && hdrlen + hashsz + datalen + hashsz >= limit) { if (st) close_istream(st); free(buf); return 0; } hashwrite(f, header, hdrlen); hashwrite(f, DELTA(entry)->idx.oid.hash, hashsz); hdrlen += hashsz; } else { if (limit && hdrlen + datalen + hashsz >= limit) { if (st) close_istream(st); free(buf); return 0; } hashwrite(f, header, hdrlen); } if (st) { datalen = write_large_blob_data(st, f, &entry->idx.oid); close_istream(st); } else { hashwrite(f, buf, datalen); free(buf); } return hdrlen + datalen; } /* Return 0 if we will bust the pack-size limit */ static off_t write_reuse_object(struct hashfile *f, struct object_entry *entry, unsigned long limit, int usable_delta) { struct packed_git *p = IN_PACK(entry); struct pack_window *w_curs = NULL; uint32_t pos; off_t offset; enum object_type type = oe_type(entry); off_t datalen; unsigned char header[MAX_PACK_OBJECT_HEADER], dheader[MAX_PACK_OBJECT_HEADER]; unsigned hdrlen; const unsigned hashsz = the_hash_algo->rawsz; unsigned long entry_size = SIZE(entry); if (DELTA(entry)) type = (allow_ofs_delta && DELTA(entry)->idx.offset) ? OBJ_OFS_DELTA : OBJ_REF_DELTA; hdrlen = encode_in_pack_object_header(header, sizeof(header), type, entry_size); offset = entry->in_pack_offset; if (offset_to_pack_pos(p, offset, &pos) < 0) die(_("write_reuse_object: could not locate %s, expected at " "offset %"PRIuMAX" in pack %s"), oid_to_hex(&entry->idx.oid), (uintmax_t)offset, p->pack_name); datalen = pack_pos_to_offset(p, pos + 1) - offset; if (!pack_to_stdout && p->index_version > 1 && check_pack_crc(p, &w_curs, offset, datalen, pack_pos_to_index(p, pos))) { error(_("bad packed object CRC for %s"), oid_to_hex(&entry->idx.oid)); unuse_pack(&w_curs); return write_no_reuse_object(f, entry, limit, usable_delta); } offset += entry->in_pack_header_size; datalen -= entry->in_pack_header_size; if (!pack_to_stdout && p->index_version == 1 && check_pack_inflate(p, &w_curs, offset, datalen, entry_size)) { error(_("corrupt packed object for %s"), oid_to_hex(&entry->idx.oid)); unuse_pack(&w_curs); return write_no_reuse_object(f, entry, limit, usable_delta); } if (type == OBJ_OFS_DELTA) { off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset; unsigned pos = sizeof(dheader) - 1; dheader[pos] = ofs & 127; while (ofs >>= 7) dheader[--pos] = 128 | (--ofs & 127); if (limit && hdrlen + sizeof(dheader) - pos + datalen + hashsz >= limit) { unuse_pack(&w_curs); return 0; } hashwrite(f, header, hdrlen); hashwrite(f, dheader + pos, sizeof(dheader) - pos); hdrlen += sizeof(dheader) - pos; reused_delta++; } else if (type == OBJ_REF_DELTA) { if (limit && hdrlen + hashsz + datalen + hashsz >= limit) { unuse_pack(&w_curs); return 0; } hashwrite(f, header, hdrlen); hashwrite(f, DELTA(entry)->idx.oid.hash, hashsz); hdrlen += hashsz; reused_delta++; } else { if (limit && hdrlen + datalen + hashsz >= limit) { unuse_pack(&w_curs); return 0; } hashwrite(f, header, hdrlen); } copy_pack_data(f, p, &w_curs, offset, datalen); unuse_pack(&w_curs); reused++; return hdrlen + datalen; } /* Return 0 if we will bust the pack-size limit */ static off_t write_object(struct hashfile *f, struct object_entry *entry, off_t write_offset) { unsigned long limit; off_t len; int usable_delta, to_reuse; if (!pack_to_stdout) crc32_begin(f); /* apply size limit if limited packsize and not first object */ if (!pack_size_limit || !nr_written) limit = 0; else if (pack_size_limit <= write_offset) /* * the earlier object did not fit the limit; avoid * mistaking this with unlimited (i.e. limit = 0). */ limit = 1; else limit = pack_size_limit - write_offset; if (!DELTA(entry)) usable_delta = 0; /* no delta */ else if (!pack_size_limit) usable_delta = 1; /* unlimited packfile */ else if (DELTA(entry)->idx.offset == (off_t)-1) usable_delta = 0; /* base was written to another pack */ else if (DELTA(entry)->idx.offset) usable_delta = 1; /* base already exists in this pack */ else usable_delta = 0; /* base could end up in another pack */ if (!reuse_object) to_reuse = 0; /* explicit */ else if (!IN_PACK(entry)) to_reuse = 0; /* can't reuse what we don't have */ else if (oe_type(entry) == OBJ_REF_DELTA || oe_type(entry) == OBJ_OFS_DELTA) /* check_object() decided it for us ... */ to_reuse = usable_delta; /* ... but pack split may override that */ else if (oe_type(entry) != entry->in_pack_type) to_reuse = 0; /* pack has delta which is unusable */ else if (DELTA(entry)) to_reuse = 0; /* we want to pack afresh */ else to_reuse = 1; /* we have it in-pack undeltified, * and we do not need to deltify it. */ if (!to_reuse) len = write_no_reuse_object(f, entry, limit, usable_delta); else len = write_reuse_object(f, entry, limit, usable_delta); if (!len) return 0; if (usable_delta) written_delta++; written++; if (!pack_to_stdout) entry->idx.crc32 = crc32_end(f); return len; } enum write_one_status { WRITE_ONE_SKIP = -1, /* already written */ WRITE_ONE_BREAK = 0, /* writing this will bust the limit; not written */ WRITE_ONE_WRITTEN = 1, /* normal */ WRITE_ONE_RECURSIVE = 2 /* already scheduled to be written */ }; static enum write_one_status write_one(struct hashfile *f, struct object_entry *e, off_t *offset) { off_t size; int recursing; /* * we set offset to 1 (which is an impossible value) to mark * the fact that this object is involved in "write its base * first before writing a deltified object" recursion. */ recursing = (e->idx.offset == 1); if (recursing) { warning(_("recursive delta detected for object %s"), oid_to_hex(&e->idx.oid)); return WRITE_ONE_RECURSIVE; } else if (e->idx.offset || e->preferred_base) { /* offset is non zero if object is written already. */ return WRITE_ONE_SKIP; } /* if we are deltified, write out base object first. */ if (DELTA(e)) { e->idx.offset = 1; /* now recurse */ switch (write_one(f, DELTA(e), offset)) { case WRITE_ONE_RECURSIVE: /* we cannot depend on this one */ SET_DELTA(e, NULL); break; default: break; case WRITE_ONE_BREAK: e->idx.offset = recursing; return WRITE_ONE_BREAK; } } e->idx.offset = *offset; size = write_object(f, e, *offset); if (!size) { e->idx.offset = recursing; return WRITE_ONE_BREAK; } written_list[nr_written++] = &e->idx; /* make sure off_t is sufficiently large not to wrap */ if (signed_add_overflows(*offset, size)) die(_("pack too large for current definition of off_t")); *offset += size; return WRITE_ONE_WRITTEN; } static int mark_tagged(const char *path UNUSED, const struct object_id *oid, int flag UNUSED, void *cb_data UNUSED) { struct object_id peeled; struct object_entry *entry = packlist_find(&to_pack, oid); if (entry) entry->tagged = 1; if (!peel_iterated_oid(oid, &peeled)) { entry = packlist_find(&to_pack, &peeled); if (entry) entry->tagged = 1; } return 0; } static inline unsigned char oe_layer(struct packing_data *pack, struct object_entry *e) { if (!pack->layer) return 0; return pack->layer[e - pack->objects]; } static inline void add_to_write_order(struct object_entry **wo, unsigned int *endp, struct object_entry *e) { if (e->filled || oe_layer(&to_pack, e) != write_layer) return; wo[(*endp)++] = e; e->filled = 1; } static void add_descendants_to_write_order(struct object_entry **wo, unsigned int *endp, struct object_entry *e) { int add_to_order = 1; while (e) { if (add_to_order) { struct object_entry *s; /* add this node... */ add_to_write_order(wo, endp, e); /* all its siblings... */ for (s = DELTA_SIBLING(e); s; s = DELTA_SIBLING(s)) { add_to_write_order(wo, endp, s); } } /* drop down a level to add left subtree nodes if possible */ if (DELTA_CHILD(e)) { add_to_order = 1; e = DELTA_CHILD(e); } else { add_to_order = 0; /* our sibling might have some children, it is next */ if (DELTA_SIBLING(e)) { e = DELTA_SIBLING(e); continue; } /* go back to our parent node */ e = DELTA(e); while (e && !DELTA_SIBLING(e)) { /* we're on the right side of a subtree, keep * going up until we can go right again */ e = DELTA(e); } if (!e) { /* done- we hit our original root node */ return; } /* pass it off to sibling at this level */ e = DELTA_SIBLING(e); } }; } static void add_family_to_write_order(struct object_entry **wo, unsigned int *endp, struct object_entry *e) { struct object_entry *root; for (root = e; DELTA(root); root = DELTA(root)) ; /* nothing */ add_descendants_to_write_order(wo, endp, root); } static void compute_layer_order(struct object_entry **wo, unsigned int *wo_end) { unsigned int i, last_untagged; struct object_entry *objects = to_pack.objects; for (i = 0; i < to_pack.nr_objects; i++) { if (objects[i].tagged) break; add_to_write_order(wo, wo_end, &objects[i]); } last_untagged = i; /* * Then fill all the tagged tips. */ for (; i < to_pack.nr_objects; i++) { if (objects[i].tagged) add_to_write_order(wo, wo_end, &objects[i]); } /* * And then all remaining commits and tags. */ for (i = last_untagged; i < to_pack.nr_objects; i++) { if (oe_type(&objects[i]) != OBJ_COMMIT && oe_type(&objects[i]) != OBJ_TAG) continue; add_to_write_order(wo, wo_end, &objects[i]); } /* * And then all the trees. */ for (i = last_untagged; i < to_pack.nr_objects; i++) { if (oe_type(&objects[i]) != OBJ_TREE) continue; add_to_write_order(wo, wo_end, &objects[i]); } /* * Finally all the rest in really tight order */ for (i = last_untagged; i < to_pack.nr_objects; i++) { if (!objects[i].filled && oe_layer(&to_pack, &objects[i]) == write_layer) add_family_to_write_order(wo, wo_end, &objects[i]); } } static struct object_entry **compute_write_order(void) { uint32_t max_layers = 1; unsigned int i, wo_end; struct object_entry **wo; struct object_entry *objects = to_pack.objects; for (i = 0; i < to_pack.nr_objects; i++) { objects[i].tagged = 0; objects[i].filled = 0; SET_DELTA_CHILD(&objects[i], NULL); SET_DELTA_SIBLING(&objects[i], NULL); } /* * Fully connect delta_child/delta_sibling network. * Make sure delta_sibling is sorted in the original * recency order. */ for (i = to_pack.nr_objects; i > 0;) { struct object_entry *e = &objects[--i]; if (!DELTA(e)) continue; /* Mark me as the first child */ e->delta_sibling_idx = DELTA(e)->delta_child_idx; SET_DELTA_CHILD(DELTA(e), e); } /* * Mark objects that are at the tip of tags. */ for_each_tag_ref(mark_tagged, NULL); if (use_delta_islands) { max_layers = compute_pack_layers(&to_pack); free_island_marks(); } ALLOC_ARRAY(wo, to_pack.nr_objects); wo_end = 0; for (; write_layer < max_layers; ++write_layer) compute_layer_order(wo, &wo_end); if (wo_end != to_pack.nr_objects) die(_("ordered %u objects, expected %"PRIu32), wo_end, to_pack.nr_objects); return wo; } /* * A reused set of objects. All objects in a chunk have the same * relative position in the original packfile and the generated * packfile. */ static struct reused_chunk { /* The offset of the first object of this chunk in the original * packfile. */ off_t original; /* The difference for "original" minus the offset of the first object of * this chunk in the generated packfile. */ off_t difference; } *reused_chunks; static int reused_chunks_nr; static int reused_chunks_alloc; static void record_reused_object(off_t where, off_t offset) { if (reused_chunks_nr && reused_chunks[reused_chunks_nr-1].difference == offset) return; ALLOC_GROW(reused_chunks, reused_chunks_nr + 1, reused_chunks_alloc); reused_chunks[reused_chunks_nr].original = where; reused_chunks[reused_chunks_nr].difference = offset; reused_chunks_nr++; } /* * Binary search to find the chunk that "where" is in. Note * that we're not looking for an exact match, just the first * chunk that contains it (which implicitly ends at the start * of the next chunk. */ static off_t find_reused_offset(off_t where) { int lo = 0, hi = reused_chunks_nr; while (lo < hi) { int mi = lo + ((hi - lo) / 2); if (where == reused_chunks[mi].original) return reused_chunks[mi].difference; if (where < reused_chunks[mi].original) hi = mi; else lo = mi + 1; } /* * The first chunk starts at zero, so we can't have gone below * there. */ assert(lo); return reused_chunks[lo-1].difference; } static void write_reused_pack_one(size_t pos, struct hashfile *out, struct pack_window **w_curs) { off_t offset, next, cur; enum object_type type; unsigned long size; offset = pack_pos_to_offset(reuse_packfile, pos); next = pack_pos_to_offset(reuse_packfile, pos + 1); record_reused_object(offset, offset - hashfile_total(out)); cur = offset; type = unpack_object_header(reuse_packfile, w_curs, &cur, &size); assert(type >= 0); if (type == OBJ_OFS_DELTA) { off_t base_offset; off_t fixup; unsigned char header[MAX_PACK_OBJECT_HEADER]; unsigned len; base_offset = get_delta_base(reuse_packfile, w_curs, &cur, type, offset); assert(base_offset != 0); /* Convert to REF_DELTA if we must... */ if (!allow_ofs_delta) { uint32_t base_pos; struct object_id base_oid; if (offset_to_pack_pos(reuse_packfile, base_offset, &base_pos) < 0) die(_("expected object at offset %"PRIuMAX" " "in pack %s"), (uintmax_t)base_offset, reuse_packfile->pack_name); nth_packed_object_id(&base_oid, reuse_packfile, pack_pos_to_index(reuse_packfile, base_pos)); len = encode_in_pack_object_header(header, sizeof(header), OBJ_REF_DELTA, size); hashwrite(out, header, len); hashwrite(out, base_oid.hash, the_hash_algo->rawsz); copy_pack_data(out, reuse_packfile, w_curs, cur, next - cur); return; } /* Otherwise see if we need to rewrite the offset... */ fixup = find_reused_offset(offset) - find_reused_offset(base_offset); if (fixup) { unsigned char ofs_header[10]; unsigned i, ofs_len; off_t ofs = offset - base_offset - fixup; len = encode_in_pack_object_header(header, sizeof(header), OBJ_OFS_DELTA, size); i = sizeof(ofs_header) - 1; ofs_header[i] = ofs & 127; while (ofs >>= 7) ofs_header[--i] = 128 | (--ofs & 127); ofs_len = sizeof(ofs_header) - i; hashwrite(out, header, len); hashwrite(out, ofs_header + sizeof(ofs_header) - ofs_len, ofs_len); copy_pack_data(out, reuse_packfile, w_curs, cur, next - cur); return; } /* ...otherwise we have no fixup, and can write it verbatim */ } copy_pack_data(out, reuse_packfile, w_curs, offset, next - offset); } static size_t write_reused_pack_verbatim(struct hashfile *out, struct pack_window **w_curs) { size_t pos = 0; while (pos < reuse_packfile_bitmap->word_alloc && reuse_packfile_bitmap->words[pos] == (eword_t)~0) pos++; if (pos) { off_t to_write; written = (pos * BITS_IN_EWORD); to_write = pack_pos_to_offset(reuse_packfile, written) - sizeof(struct pack_header); /* We're recording one chunk, not one object. */ record_reused_object(sizeof(struct pack_header), 0); hashflush(out); copy_pack_data(out, reuse_packfile, w_curs, sizeof(struct pack_header), to_write); display_progress(progress_state, written); } return pos; } static void write_reused_pack(struct hashfile *f) { size_t i = 0; uint32_t offset; struct pack_window *w_curs = NULL; if (allow_ofs_delta) i = write_reused_pack_verbatim(f, &w_curs); for (; i < reuse_packfile_bitmap->word_alloc; ++i) { eword_t word = reuse_packfile_bitmap->words[i]; size_t pos = (i * BITS_IN_EWORD); for (offset = 0; offset < BITS_IN_EWORD; ++offset) { if ((word >> offset) == 0) break; offset += ewah_bit_ctz64(word >> offset); /* * Can use bit positions directly, even for MIDX * bitmaps. See comment in try_partial_reuse() * for why. */ write_reused_pack_one(pos + offset, f, &w_curs); display_progress(progress_state, ++written); } } unuse_pack(&w_curs); } static void write_excluded_by_configs(void) { struct oidset_iter iter; const struct object_id *oid; oidset_iter_init(&excluded_by_config, &iter); while ((oid = oidset_iter_next(&iter))) { struct configured_exclusion *ex = oidmap_get(&configured_exclusions, oid); if (!ex) BUG("configured exclusion wasn't configured"); write_in_full(1, ex->pack_hash_hex, strlen(ex->pack_hash_hex)); write_in_full(1, " ", 1); write_in_full(1, ex->uri, strlen(ex->uri)); write_in_full(1, "\n", 1); } } static const char no_split_warning[] = N_( "disabling bitmap writing, packs are split due to pack.packSizeLimit" ); static void write_pack_file(void) { uint32_t i = 0, j; struct hashfile *f; off_t offset; uint32_t nr_remaining = nr_result; time_t last_mtime = 0; struct object_entry **write_order; if (progress > pack_to_stdout) progress_state = start_progress(_("Writing objects"), nr_result); ALLOC_ARRAY(written_list, to_pack.nr_objects); write_order = compute_write_order(); do { unsigned char hash[GIT_MAX_RAWSZ]; char *pack_tmp_name = NULL; if (pack_to_stdout) f = hashfd_throughput(1, "", progress_state); else f = create_tmp_packfile(&pack_tmp_name); offset = write_pack_header(f, nr_remaining); if (reuse_packfile) { assert(pack_to_stdout); write_reused_pack(f); offset = hashfile_total(f); } nr_written = 0; for (; i < to_pack.nr_objects; i++) { struct object_entry *e = write_order[i]; if (write_one(f, e, &offset) == WRITE_ONE_BREAK) break; display_progress(progress_state, written); } if (pack_to_stdout) { /* * We never fsync when writing to stdout since we may * not be writing to an actual pack file. For instance, * the upload-pack code passes a pipe here. Calling * fsync on a pipe results in unnecessary * synchronization with the reader on some platforms. */ finalize_hashfile(f, hash, FSYNC_COMPONENT_NONE, CSUM_HASH_IN_STREAM | CSUM_CLOSE); } else if (nr_written == nr_remaining) { finalize_hashfile(f, hash, FSYNC_COMPONENT_PACK, CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); } else { /* * If we wrote the wrong number of entries in the * header, rewrite it like in fast-import. */ int fd = finalize_hashfile(f, hash, FSYNC_COMPONENT_PACK, 0); fixup_pack_header_footer(fd, hash, pack_tmp_name, nr_written, hash, offset); close(fd); if (write_bitmap_index) { if (write_bitmap_index != WRITE_BITMAP_QUIET) warning(_(no_split_warning)); write_bitmap_index = 0; } } if (!pack_to_stdout) { struct stat st; struct strbuf tmpname = STRBUF_INIT; char *idx_tmp_name = NULL; /* * Packs are runtime accessed in their mtime * order since newer packs are more likely to contain * younger objects. So if we are creating multiple * packs then we should modify the mtime of later ones * to preserve this property. */ if (stat(pack_tmp_name, &st) < 0) { warning_errno(_("failed to stat %s"), pack_tmp_name); } else if (!last_mtime) { last_mtime = st.st_mtime; } else { struct utimbuf utb; utb.actime = st.st_atime; utb.modtime = --last_mtime; if (utime(pack_tmp_name, &utb) < 0) warning_errno(_("failed utime() on %s"), pack_tmp_name); } strbuf_addf(&tmpname, "%s-%s.", base_name, hash_to_hex(hash)); if (write_bitmap_index) { bitmap_writer_set_checksum(hash); bitmap_writer_build_type_index( &to_pack, written_list, nr_written); } if (cruft) pack_idx_opts.flags |= WRITE_MTIMES; stage_tmp_packfiles(&tmpname, pack_tmp_name, written_list, nr_written, &to_pack, &pack_idx_opts, hash, &idx_tmp_name); if (write_bitmap_index) { size_t tmpname_len = tmpname.len; strbuf_addstr(&tmpname, "bitmap"); stop_progress(&progress_state); bitmap_writer_show_progress(progress); bitmap_writer_select_commits(indexed_commits, indexed_commits_nr, -1); if (bitmap_writer_build(&to_pack) < 0) die(_("failed to write bitmap index")); bitmap_writer_finish(written_list, nr_written, tmpname.buf, write_bitmap_options); write_bitmap_index = 0; strbuf_setlen(&tmpname, tmpname_len); } rename_tmp_packfile_idx(&tmpname, &idx_tmp_name); free(idx_tmp_name); strbuf_release(&tmpname); free(pack_tmp_name); puts(hash_to_hex(hash)); } /* mark written objects as written to previous pack */ for (j = 0; j < nr_written; j++) { written_list[j]->offset = (off_t)-1; } nr_remaining -= nr_written; } while (nr_remaining && i < to_pack.nr_objects); free(written_list); free(write_order); stop_progress(&progress_state); if (written != nr_result) die(_("wrote %"PRIu32" objects while expecting %"PRIu32), written, nr_result); trace2_data_intmax("pack-objects", the_repository, "write_pack_file/wrote", nr_result); } static int no_try_delta(const char *path) { static struct attr_check *check; if (!check) check = attr_check_initl("delta", NULL); git_check_attr(the_repository->index, NULL, path, check); if (ATTR_FALSE(check->items[0].value)) return 1; return 0; } /* * When adding an object, check whether we have already added it * to our packing list. If so, we can skip. However, if we are * being asked to excludei t, but the previous mention was to include * it, make sure to adjust its flags and tweak our numbers accordingly. * * As an optimization, we pass out the index position where we would have * found the item, since that saves us from having to look it up again a * few lines later when we want to add the new entry. */ static int have_duplicate_entry(const struct object_id *oid, int exclude) { struct object_entry *entry; if (reuse_packfile_bitmap && bitmap_walk_contains(bitmap_git, reuse_packfile_bitmap, oid)) return 1; entry = packlist_find(&to_pack, oid); if (!entry) return 0; if (exclude) { if (!entry->preferred_base) nr_result--; entry->preferred_base = 1; } return 1; } static int want_found_object(const struct object_id *oid, int exclude, struct packed_git *p) { if (exclude) return 1; if (incremental) return 0; if (!is_pack_valid(p)) return -1; /* * When asked to do --local (do not include an object that appears in a * pack we borrow from elsewhere) or --honor-pack-keep (do not include * an object that appears in a pack marked with .keep), finding a pack * that matches the criteria is sufficient for us to decide to omit it. * However, even if this pack does not satisfy the criteria, we need to * make sure no copy of this object appears in _any_ pack that makes us * to omit the object, so we need to check all the packs. * * We can however first check whether these options can possibly matter; * if they do not matter we know we want the object in generated pack. * Otherwise, we signal "-1" at the end to tell the caller that we do * not know either way, and it needs to check more packs. */ /* * Objects in packs borrowed from elsewhere are discarded regardless of * if they appear in other packs that weren't borrowed. */ if (local && !p->pack_local) return 0; /* * Then handle .keep first, as we have a fast(er) path there. */ if (ignore_packed_keep_on_disk || ignore_packed_keep_in_core) { /* * Set the flags for the kept-pack cache to be the ones we want * to ignore. * * That is, if we are ignoring objects in on-disk keep packs, * then we want to search through the on-disk keep and ignore * the in-core ones. */ unsigned flags = 0; if (ignore_packed_keep_on_disk) flags |= ON_DISK_KEEP_PACKS; if (ignore_packed_keep_in_core) flags |= IN_CORE_KEEP_PACKS; if (ignore_packed_keep_on_disk && p->pack_keep) return 0; if (ignore_packed_keep_in_core && p->pack_keep_in_core) return 0; if (has_object_kept_pack(oid, flags)) return 0; } /* * At this point we know definitively that either we don't care about * keep-packs, or the object is not in one. Keep checking other * conditions... */ if (!local || !have_non_local_packs) return 1; /* we don't know yet; keep looking for more packs */ return -1; } static int want_object_in_pack_one(struct packed_git *p, const struct object_id *oid, int exclude, struct packed_git **found_pack, off_t *found_offset) { off_t offset; if (p == *found_pack) offset = *found_offset; else offset = find_pack_entry_one(oid->hash, p); if (offset) { if (!*found_pack) { if (!is_pack_valid(p)) return -1; *found_offset = offset; *found_pack = p; } return want_found_object(oid, exclude, p); } return -1; } /* * Check whether we want the object in the pack (e.g., we do not want * objects found in non-local stores if the "--local" option was used). * * If the caller already knows an existing pack it wants to take the object * from, that is passed in *found_pack and *found_offset; otherwise this * function finds if there is any pack that has the object and returns the pack * and its offset in these variables. */ static int want_object_in_pack(const struct object_id *oid, int exclude, struct packed_git **found_pack, off_t *found_offset) { int want; struct list_head *pos; struct multi_pack_index *m; if (!exclude && local && has_loose_object_nonlocal(oid)) return 0; /* * If we already know the pack object lives in, start checks from that * pack - in the usual case when neither --local was given nor .keep files * are present we will determine the answer right now. */ if (*found_pack) { want = want_found_object(oid, exclude, *found_pack); if (want != -1) return want; *found_pack = NULL; *found_offset = 0; } for (m = get_multi_pack_index(the_repository); m; m = m->next) { struct pack_entry e; if (fill_midx_entry(the_repository, oid, &e, m)) { want = want_object_in_pack_one(e.p, oid, exclude, found_pack, found_offset); if (want != -1) return want; } } list_for_each(pos, get_packed_git_mru(the_repository)) { struct packed_git *p = list_entry(pos, struct packed_git, mru); want = want_object_in_pack_one(p, oid, exclude, found_pack, found_offset); if (!exclude && want > 0) list_move(&p->mru, get_packed_git_mru(the_repository)); if (want != -1) return want; } if (uri_protocols.nr) { struct configured_exclusion *ex = oidmap_get(&configured_exclusions, oid); int i; const char *p; if (ex) { for (i = 0; i < uri_protocols.nr; i++) { if (skip_prefix(ex->uri, uri_protocols.items[i].string, &p) && *p == ':') { oidset_insert(&excluded_by_config, oid); return 0; } } } } return 1; } static struct object_entry *create_object_entry(const struct object_id *oid, enum object_type type, uint32_t hash, int exclude, int no_try_delta, struct packed_git *found_pack, off_t found_offset) { struct object_entry *entry; entry = packlist_alloc(&to_pack, oid); entry->hash = hash; oe_set_type(entry, type); if (exclude) entry->preferred_base = 1; else nr_result++; if (found_pack) { oe_set_in_pack(&to_pack, entry, found_pack); entry->in_pack_offset = found_offset; } entry->no_try_delta = no_try_delta; return entry; } static const char no_closure_warning[] = N_( "disabling bitmap writing, as some objects are not being packed" ); static int add_object_entry(const struct object_id *oid, enum object_type type, const char *name, int exclude) { struct packed_git *found_pack = NULL; off_t found_offset = 0; display_progress(progress_state, ++nr_seen); if (have_duplicate_entry(oid, exclude)) return 0; if (!want_object_in_pack(oid, exclude, &found_pack, &found_offset)) { /* The pack is missing an object, so it will not have closure */ if (write_bitmap_index) { if (write_bitmap_index != WRITE_BITMAP_QUIET) warning(_(no_closure_warning)); write_bitmap_index = 0; } return 0; } create_object_entry(oid, type, pack_name_hash(name), exclude, name && no_try_delta(name), found_pack, found_offset); return 1; } static int add_object_entry_from_bitmap(const struct object_id *oid, enum object_type type, int flags UNUSED, uint32_t name_hash, struct packed_git *pack, off_t offset) { display_progress(progress_state, ++nr_seen); if (have_duplicate_entry(oid, 0)) return 0; if (!want_object_in_pack(oid, 0, &pack, &offset)) return 0; create_object_entry(oid, type, name_hash, 0, 0, pack, offset); return 1; } struct pbase_tree_cache { struct object_id oid; int ref; int temporary; void *tree_data; unsigned long tree_size; }; static struct pbase_tree_cache *(pbase_tree_cache[256]); static int pbase_tree_cache_ix(const struct object_id *oid) { return oid->hash[0] % ARRAY_SIZE(pbase_tree_cache); } static int pbase_tree_cache_ix_incr(int ix) { return (ix+1) % ARRAY_SIZE(pbase_tree_cache); } static struct pbase_tree { struct pbase_tree *next; /* This is a phony "cache" entry; we are not * going to evict it or find it through _get() * mechanism -- this is for the toplevel node that * would almost always change with any commit. */ struct pbase_tree_cache pcache; } *pbase_tree; static struct pbase_tree_cache *pbase_tree_get(const struct object_id *oid) { struct pbase_tree_cache *ent, *nent; void *data; unsigned long size; enum object_type type; int neigh; int my_ix = pbase_tree_cache_ix(oid); int available_ix = -1; /* pbase-tree-cache acts as a limited hashtable. * your object will be found at your index or within a few * slots after that slot if it is cached. */ for (neigh = 0; neigh < 8; neigh++) { ent = pbase_tree_cache[my_ix]; if (ent && oideq(&ent->oid, oid)) { ent->ref++; return ent; } else if (((available_ix < 0) && (!ent || !ent->ref)) || ((0 <= available_ix) && (!ent && pbase_tree_cache[available_ix]))) available_ix = my_ix; if (!ent) break; my_ix = pbase_tree_cache_ix_incr(my_ix); } /* Did not find one. Either we got a bogus request or * we need to read and perhaps cache. */ data = read_object_file(oid, &type, &size); if (!data) return NULL; if (type != OBJ_TREE) { free(data); return NULL; } /* We need to either cache or return a throwaway copy */ if (available_ix < 0) ent = NULL; else { ent = pbase_tree_cache[available_ix]; my_ix = available_ix; } if (!ent) { nent = xmalloc(sizeof(*nent)); nent->temporary = (available_ix < 0); } else { /* evict and reuse */ free(ent->tree_data); nent = ent; } oidcpy(&nent->oid, oid); nent->tree_data = data; nent->tree_size = size; nent->ref = 1; if (!nent->temporary) pbase_tree_cache[my_ix] = nent; return nent; } static void pbase_tree_put(struct pbase_tree_cache *cache) { if (!cache->temporary) { cache->ref--; return; } free(cache->tree_data); free(cache); } static size_t name_cmp_len(const char *name) { return strcspn(name, "\n/"); } static void add_pbase_object(struct tree_desc *tree, const char *name, size_t cmplen, const char *fullname) { struct name_entry entry; int cmp; while (tree_entry(tree,&entry)) { if (S_ISGITLINK(entry.mode)) continue; cmp = tree_entry_len(&entry) != cmplen ? 1 : memcmp(name, entry.path, cmplen); if (cmp > 0) continue; if (cmp < 0) return; if (name[cmplen] != '/') { add_object_entry(&entry.oid, object_type(entry.mode), fullname, 1); return; } if (S_ISDIR(entry.mode)) { struct tree_desc sub; struct pbase_tree_cache *tree; const char *down = name+cmplen+1; size_t downlen = name_cmp_len(down); tree = pbase_tree_get(&entry.oid); if (!tree) return; init_tree_desc(&sub, tree->tree_data, tree->tree_size); add_pbase_object(&sub, down, downlen, fullname); pbase_tree_put(tree); } } } static unsigned *done_pbase_paths; static int done_pbase_paths_num; static int done_pbase_paths_alloc; static int done_pbase_path_pos(unsigned hash) { int lo = 0; int hi = done_pbase_paths_num; while (lo < hi) { int mi = lo + (hi - lo) / 2; if (done_pbase_paths[mi] == hash) return mi; if (done_pbase_paths[mi] < hash) hi = mi; else lo = mi + 1; } return -lo-1; } static int check_pbase_path(unsigned hash) { int pos = done_pbase_path_pos(hash); if (0 <= pos) return 1; pos = -pos - 1; ALLOC_GROW(done_pbase_paths, done_pbase_paths_num + 1, done_pbase_paths_alloc); done_pbase_paths_num++; if (pos < done_pbase_paths_num) MOVE_ARRAY(done_pbase_paths + pos + 1, done_pbase_paths + pos, done_pbase_paths_num - pos - 1); done_pbase_paths[pos] = hash; return 0; } static void add_preferred_base_object(const char *name) { struct pbase_tree *it; size_t cmplen; unsigned hash = pack_name_hash(name); if (!num_preferred_base || check_pbase_path(hash)) return; cmplen = name_cmp_len(name); for (it = pbase_tree; it; it = it->next) { if (cmplen == 0) { add_object_entry(&it->pcache.oid, OBJ_TREE, NULL, 1); } else { struct tree_desc tree; init_tree_desc(&tree, it->pcache.tree_data, it->pcache.tree_size); add_pbase_object(&tree, name, cmplen, name); } } } static void add_preferred_base(struct object_id *oid) { struct pbase_tree *it; void *data; unsigned long size; struct object_id tree_oid; if (window <= num_preferred_base++) return; data = read_object_with_reference(the_repository, oid, OBJ_TREE, &size, &tree_oid); if (!data) return; for (it = pbase_tree; it; it = it->next) { if (oideq(&it->pcache.oid, &tree_oid)) { free(data); return; } } CALLOC_ARRAY(it, 1); it->next = pbase_tree; pbase_tree = it; oidcpy(&it->pcache.oid, &tree_oid); it->pcache.tree_data = data; it->pcache.tree_size = size; } static void cleanup_preferred_base(void) { struct pbase_tree *it; unsigned i; it = pbase_tree; pbase_tree = NULL; while (it) { struct pbase_tree *tmp = it; it = tmp->next; free(tmp->pcache.tree_data); free(tmp); } for (i = 0; i < ARRAY_SIZE(pbase_tree_cache); i++) { if (!pbase_tree_cache[i]) continue; free(pbase_tree_cache[i]->tree_data); FREE_AND_NULL(pbase_tree_cache[i]); } FREE_AND_NULL(done_pbase_paths); done_pbase_paths_num = done_pbase_paths_alloc = 0; } /* * Return 1 iff the object specified by "delta" can be sent * literally as a delta against the base in "base_sha1". If * so, then *base_out will point to the entry in our packing * list, or NULL if we must use the external-base list. * * Depth value does not matter - find_deltas() will * never consider reused delta as the base object to * deltify other objects against, in order to avoid * circular deltas. */ static int can_reuse_delta(const struct object_id *base_oid, struct object_entry *delta, struct object_entry **base_out) { struct object_entry *base; /* * First see if we're already sending the base (or it's explicitly in * our "excluded" list). */ base = packlist_find(&to_pack, base_oid); if (base) { if (!in_same_island(&delta->idx.oid, &base->idx.oid)) return 0; *base_out = base; return 1; } /* * Otherwise, reachability bitmaps may tell us if the receiver has it, * even if it was buried too deep in history to make it into the * packing list. */ if (thin && bitmap_has_oid_in_uninteresting(bitmap_git, base_oid)) { if (use_delta_islands) { if (!in_same_island(&delta->idx.oid, base_oid)) return 0; } *base_out = NULL; return 1; } return 0; } static void prefetch_to_pack(uint32_t object_index_start) { struct oid_array to_fetch = OID_ARRAY_INIT; uint32_t i; for (i = object_index_start; i < to_pack.nr_objects; i++) { struct object_entry *entry = to_pack.objects + i; if (!oid_object_info_extended(the_repository, &entry->idx.oid, NULL, OBJECT_INFO_FOR_PREFETCH)) continue; oid_array_append(&to_fetch, &entry->idx.oid); } promisor_remote_get_direct(the_repository, to_fetch.oid, to_fetch.nr); oid_array_clear(&to_fetch); } static void check_object(struct object_entry *entry, uint32_t object_index) { unsigned long canonical_size; enum object_type type; struct object_info oi = {.typep = &type, .sizep = &canonical_size}; if (IN_PACK(entry)) { struct packed_git *p = IN_PACK(entry); struct pack_window *w_curs = NULL; int have_base = 0; struct object_id base_ref; struct object_entry *base_entry; unsigned long used, used_0; unsigned long avail; off_t ofs; unsigned char *buf, c; enum object_type type; unsigned long in_pack_size; buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail); /* * We want in_pack_type even if we do not reuse delta * since non-delta representations could still be reused. */ used = unpack_object_header_buffer(buf, avail, &type, &in_pack_size); if (used == 0) goto give_up; if (type < 0) BUG("invalid type %d", type); entry->in_pack_type = type; /* * Determine if this is a delta and if so whether we can * reuse it or not. Otherwise let's find out as cheaply as * possible what the actual type and size for this object is. */ switch (entry->in_pack_type) { default: /* Not a delta hence we've already got all we need. */ oe_set_type(entry, entry->in_pack_type); SET_SIZE(entry, in_pack_size); entry->in_pack_header_size = used; if (oe_type(entry) < OBJ_COMMIT || oe_type(entry) > OBJ_BLOB) goto give_up; unuse_pack(&w_curs); return; case OBJ_REF_DELTA: if (reuse_delta && !entry->preferred_base) { oidread(&base_ref, use_pack(p, &w_curs, entry->in_pack_offset + used, NULL)); have_base = 1; } entry->in_pack_header_size = used + the_hash_algo->rawsz; break; case OBJ_OFS_DELTA: buf = use_pack(p, &w_curs, entry->in_pack_offset + used, NULL); used_0 = 0; c = buf[used_0++]; ofs = c & 127; while (c & 128) { ofs += 1; if (!ofs || MSB(ofs, 7)) { error(_("delta base offset overflow in pack for %s"), oid_to_hex(&entry->idx.oid)); goto give_up; } c = buf[used_0++]; ofs = (ofs << 7) + (c & 127); } ofs = entry->in_pack_offset - ofs; if (ofs <= 0 || ofs >= entry->in_pack_offset) { error(_("delta base offset out of bound for %s"), oid_to_hex(&entry->idx.oid)); goto give_up; } if (reuse_delta && !entry->preferred_base) { uint32_t pos; if (offset_to_pack_pos(p, ofs, &pos) < 0) goto give_up; if (!nth_packed_object_id(&base_ref, p, pack_pos_to_index(p, pos))) have_base = 1; } entry->in_pack_header_size = used + used_0; break; } if (have_base && can_reuse_delta(&base_ref, entry, &base_entry)) { oe_set_type(entry, entry->in_pack_type); SET_SIZE(entry, in_pack_size); /* delta size */ SET_DELTA_SIZE(entry, in_pack_size); if (base_entry) { SET_DELTA(entry, base_entry); entry->delta_sibling_idx = base_entry->delta_child_idx; SET_DELTA_CHILD(base_entry, entry); } else { SET_DELTA_EXT(entry, &base_ref); } unuse_pack(&w_curs); return; } if (oe_type(entry)) { off_t delta_pos; /* * This must be a delta and we already know what the * final object type is. Let's extract the actual * object size from the delta header. */ delta_pos = entry->in_pack_offset + entry->in_pack_header_size; canonical_size = get_size_from_delta(p, &w_curs, delta_pos); if (canonical_size == 0) goto give_up; SET_SIZE(entry, canonical_size); unuse_pack(&w_curs); return; } /* * No choice but to fall back to the recursive delta walk * with oid_object_info() to find about the object type * at this point... */ give_up: unuse_pack(&w_curs); } if (oid_object_info_extended(the_repository, &entry->idx.oid, &oi, OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_LOOKUP_REPLACE) < 0) { if (has_promisor_remote()) { prefetch_to_pack(object_index); if (oid_object_info_extended(the_repository, &entry->idx.oid, &oi, OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_LOOKUP_REPLACE) < 0) type = -1; } else { type = -1; } } oe_set_type(entry, type); if (entry->type_valid) { SET_SIZE(entry, canonical_size); } else { /* * Bad object type is checked in prepare_pack(). This is * to permit a missing preferred base object to be ignored * as a preferred base. Doing so can result in a larger * pack file, but the transfer will still take place. */ } } static int pack_offset_sort(const void *_a, const void *_b) { const struct object_entry *a = *(struct object_entry **)_a; const struct object_entry *b = *(struct object_entry **)_b; const struct packed_git *a_in_pack = IN_PACK(a); const struct packed_git *b_in_pack = IN_PACK(b); /* avoid filesystem trashing with loose objects */ if (!a_in_pack && !b_in_pack) return oidcmp(&a->idx.oid, &b->idx.oid); if (a_in_pack < b_in_pack) return -1; if (a_in_pack > b_in_pack) return 1; return a->in_pack_offset < b->in_pack_offset ? -1 : (a->in_pack_offset > b->in_pack_offset); } /* * Drop an on-disk delta we were planning to reuse. Naively, this would * just involve blanking out the "delta" field, but we have to deal * with some extra book-keeping: * * 1. Removing ourselves from the delta_sibling linked list. * * 2. Updating our size/type to the non-delta representation. These were * either not recorded initially (size) or overwritten with the delta type * (type) when check_object() decided to reuse the delta. * * 3. Resetting our delta depth, as we are now a base object. */ static void drop_reused_delta(struct object_entry *entry) { unsigned *idx = &to_pack.objects[entry->delta_idx - 1].delta_child_idx; struct object_info oi = OBJECT_INFO_INIT; enum object_type type; unsigned long size; while (*idx) { struct object_entry *oe = &to_pack.objects[*idx - 1]; if (oe == entry) *idx = oe->delta_sibling_idx; else idx = &oe->delta_sibling_idx; } SET_DELTA(entry, NULL); entry->depth = 0; oi.sizep = &size; oi.typep = &type; if (packed_object_info(the_repository, IN_PACK(entry), entry->in_pack_offset, &oi) < 0) { /* * We failed to get the info from this pack for some reason; * fall back to oid_object_info, which may find another copy. * And if that fails, the error will be recorded in oe_type(entry) * and dealt with in prepare_pack(). */ oe_set_type(entry, oid_object_info(the_repository, &entry->idx.oid, &size)); } else { oe_set_type(entry, type); } SET_SIZE(entry, size); } /* * Follow the chain of deltas from this entry onward, throwing away any links * that cause us to hit a cycle (as determined by the DFS state flags in * the entries). * * We also detect too-long reused chains that would violate our --depth * limit. */ static void break_delta_chains(struct object_entry *entry) { /* * The actual depth of each object we will write is stored as an int, * as it cannot exceed our int "depth" limit. But before we break * changes based no that limit, we may potentially go as deep as the * number of objects, which is elsewhere bounded to a uint32_t. */ uint32_t total_depth; struct object_entry *cur, *next; for (cur = entry, total_depth = 0; cur; cur = DELTA(cur), total_depth++) { if (cur->dfs_state == DFS_DONE) { /* * We've already seen this object and know it isn't * part of a cycle. We do need to append its depth * to our count. */ total_depth += cur->depth; break; } /* * We break cycles before looping, so an ACTIVE state (or any * other cruft which made its way into the state variable) * is a bug. */ if (cur->dfs_state != DFS_NONE) BUG("confusing delta dfs state in first pass: %d", cur->dfs_state); /* * Now we know this is the first time we've seen the object. If * it's not a delta, we're done traversing, but we'll mark it * done to save time on future traversals. */ if (!DELTA(cur)) { cur->dfs_state = DFS_DONE; break; } /* * Mark ourselves as active and see if the next step causes * us to cycle to another active object. It's important to do * this _before_ we loop, because it impacts where we make the * cut, and thus how our total_depth counter works. * E.g., We may see a partial loop like: * * A -> B -> C -> D -> B * * Cutting B->C breaks the cycle. But now the depth of A is * only 1, and our total_depth counter is at 3. The size of the * error is always one less than the size of the cycle we * broke. Commits C and D were "lost" from A's chain. * * If we instead cut D->B, then the depth of A is correct at 3. * We keep all commits in the chain that we examined. */ cur->dfs_state = DFS_ACTIVE; if (DELTA(cur)->dfs_state == DFS_ACTIVE) { drop_reused_delta(cur); cur->dfs_state = DFS_DONE; break; } } /* * And now that we've gone all the way to the bottom of the chain, we * need to clear the active flags and set the depth fields as * appropriate. Unlike the loop above, which can quit when it drops a * delta, we need to keep going to look for more depth cuts. So we need * an extra "next" pointer to keep going after we reset cur->delta. */ for (cur = entry; cur; cur = next) { next = DELTA(cur); /* * We should have a chain of zero or more ACTIVE states down to * a final DONE. We can quit after the DONE, because either it * has no bases, or we've already handled them in a previous * call. */ if (cur->dfs_state == DFS_DONE) break; else if (cur->dfs_state != DFS_ACTIVE) BUG("confusing delta dfs state in second pass: %d", cur->dfs_state); /* * If the total_depth is more than depth, then we need to snip * the chain into two or more smaller chains that don't exceed * the maximum depth. Most of the resulting chains will contain * (depth + 1) entries (i.e., depth deltas plus one base), and * the last chain (i.e., the one containing entry) will contain * whatever entries are left over, namely * (total_depth % (depth + 1)) of them. * * Since we are iterating towards decreasing depth, we need to * decrement total_depth as we go, and we need to write to the * entry what its final depth will be after all of the * snipping. Since we're snipping into chains of length (depth * + 1) entries, the final depth of an entry will be its * original depth modulo (depth + 1). Any time we encounter an * entry whose final depth is supposed to be zero, we snip it * from its delta base, thereby making it so. */ cur->depth = (total_depth--) % (depth + 1); if (!cur->depth) drop_reused_delta(cur); cur->dfs_state = DFS_DONE; } } static void get_object_details(void) { uint32_t i; struct object_entry **sorted_by_offset; if (progress) progress_state = start_progress(_("Counting objects"), to_pack.nr_objects); CALLOC_ARRAY(sorted_by_offset, to_pack.nr_objects); for (i = 0; i < to_pack.nr_objects; i++) sorted_by_offset[i] = to_pack.objects + i; QSORT(sorted_by_offset, to_pack.nr_objects, pack_offset_sort); for (i = 0; i < to_pack.nr_objects; i++) { struct object_entry *entry = sorted_by_offset[i]; check_object(entry, i); if (entry->type_valid && oe_size_greater_than(&to_pack, entry, big_file_threshold)) entry->no_try_delta = 1; display_progress(progress_state, i + 1); } stop_progress(&progress_state); /* * This must happen in a second pass, since we rely on the delta * information for the whole list being completed. */ for (i = 0; i < to_pack.nr_objects; i++) break_delta_chains(&to_pack.objects[i]); free(sorted_by_offset); } /* * We search for deltas in a list sorted by type, by filename hash, and then * by size, so that we see progressively smaller and smaller files. * That's because we prefer deltas to be from the bigger file * to the smaller -- deletes are potentially cheaper, but perhaps * more importantly, the bigger file is likely the more recent * one. The deepest deltas are therefore the oldest objects which are * less susceptible to be accessed often. */ static int type_size_sort(const void *_a, const void *_b) { const struct object_entry *a = *(struct object_entry **)_a; const struct object_entry *b = *(struct object_entry **)_b; const enum object_type a_type = oe_type(a); const enum object_type b_type = oe_type(b); const unsigned long a_size = SIZE(a); const unsigned long b_size = SIZE(b); if (a_type > b_type) return -1; if (a_type < b_type) return 1; if (a->hash > b->hash) return -1; if (a->hash < b->hash) return 1; if (a->preferred_base > b->preferred_base) return -1; if (a->preferred_base < b->preferred_base) return 1; if (use_delta_islands) { const int island_cmp = island_delta_cmp(&a->idx.oid, &b->idx.oid); if (island_cmp) return island_cmp; } if (a_size > b_size) return -1; if (a_size < b_size) return 1; return a < b ? -1 : (a > b); /* newest first */ } struct unpacked { struct object_entry *entry; void *data; struct delta_index *index; unsigned depth; }; static int delta_cacheable(unsigned long src_size, unsigned long trg_size, unsigned long delta_size) { if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size) return 0; if (delta_size < cache_max_small_delta_size) return 1; /* cache delta, if objects are large enough compared to delta size */ if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10)) return 1; return 0; } /* Protect delta_cache_size */ static pthread_mutex_t cache_mutex; #define cache_lock() pthread_mutex_lock(&cache_mutex) #define cache_unlock() pthread_mutex_unlock(&cache_mutex) /* * Protect object list partitioning (e.g. struct thread_param) and * progress_state */ static pthread_mutex_t progress_mutex; #define progress_lock() pthread_mutex_lock(&progress_mutex) #define progress_unlock() pthread_mutex_unlock(&progress_mutex) /* * Access to struct object_entry is unprotected since each thread owns * a portion of the main object list. Just don't access object entries * ahead in the list because they can be stolen and would need * progress_mutex for protection. */ static inline int oe_size_less_than(struct packing_data *pack, const struct object_entry *lhs, unsigned long rhs) { if (lhs->size_valid) return lhs->size_ < rhs; if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */ return 0; return oe_get_size_slow(pack, lhs) < rhs; } static inline void oe_set_tree_depth(struct packing_data *pack, struct object_entry *e, unsigned int tree_depth) { if (!pack->tree_depth) CALLOC_ARRAY(pack->tree_depth, pack->nr_alloc); pack->tree_depth[e - pack->objects] = tree_depth; } /* * Return the size of the object without doing any delta * reconstruction (so non-deltas are true object sizes, but deltas * return the size of the delta data). */ unsigned long oe_get_size_slow(struct packing_data *pack, const struct object_entry *e) { struct packed_git *p; struct pack_window *w_curs; unsigned char *buf; enum object_type type; unsigned long used, avail, size; if (e->type_ != OBJ_OFS_DELTA && e->type_ != OBJ_REF_DELTA) { packing_data_lock(&to_pack); if (oid_object_info(the_repository, &e->idx.oid, &size) < 0) die(_("unable to get size of %s"), oid_to_hex(&e->idx.oid)); packing_data_unlock(&to_pack); return size; } p = oe_in_pack(pack, e); if (!p) BUG("when e->type is a delta, it must belong to a pack"); packing_data_lock(&to_pack); w_curs = NULL; buf = use_pack(p, &w_curs, e->in_pack_offset, &avail); used = unpack_object_header_buffer(buf, avail, &type, &size); if (used == 0) die(_("unable to parse object header of %s"), oid_to_hex(&e->idx.oid)); unuse_pack(&w_curs); packing_data_unlock(&to_pack); return size; } static int try_delta(struct unpacked *trg, struct unpacked *src, unsigned max_depth, unsigned long *mem_usage) { struct object_entry *trg_entry = trg->entry; struct object_entry *src_entry = src->entry; unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz; unsigned ref_depth; enum object_type type; void *delta_buf; /* Don't bother doing diffs between different types */ if (oe_type(trg_entry) != oe_type(src_entry)) return -1; /* * We do not bother to try a delta that we discarded on an * earlier try, but only when reusing delta data. Note that * src_entry that is marked as the preferred_base should always * be considered, as even if we produce a suboptimal delta against * it, we will still save the transfer cost, as we already know * the other side has it and we won't send src_entry at all. */ if (reuse_delta && IN_PACK(trg_entry) && IN_PACK(trg_entry) == IN_PACK(src_entry) && !src_entry->preferred_base && trg_entry->in_pack_type != OBJ_REF_DELTA && trg_entry->in_pack_type != OBJ_OFS_DELTA) return 0; /* Let's not bust the allowed depth. */ if (src->depth >= max_depth) return 0; /* Now some size filtering heuristics. */ trg_size = SIZE(trg_entry); if (!DELTA(trg_entry)) { max_size = trg_size/2 - the_hash_algo->rawsz; ref_depth = 1; } else { max_size = DELTA_SIZE(trg_entry); ref_depth = trg->depth; } max_size = (uint64_t)max_size * (max_depth - src->depth) / (max_depth - ref_depth + 1); if (max_size == 0) return 0; src_size = SIZE(src_entry); sizediff = src_size < trg_size ? trg_size - src_size : 0; if (sizediff >= max_size) return 0; if (trg_size < src_size / 32) return 0; if (!in_same_island(&trg->entry->idx.oid, &src->entry->idx.oid)) return 0; /* Load data if not already done */ if (!trg->data) { packing_data_lock(&to_pack); trg->data = read_object_file(&trg_entry->idx.oid, &type, &sz); packing_data_unlock(&to_pack); if (!trg->data) die(_("object %s cannot be read"), oid_to_hex(&trg_entry->idx.oid)); if (sz != trg_size) die(_("object %s inconsistent object length (%"PRIuMAX" vs %"PRIuMAX")"), oid_to_hex(&trg_entry->idx.oid), (uintmax_t)sz, (uintmax_t)trg_size); *mem_usage += sz; } if (!src->data) { packing_data_lock(&to_pack); src->data = read_object_file(&src_entry->idx.oid, &type, &sz); packing_data_unlock(&to_pack); if (!src->data) { if (src_entry->preferred_base) { static int warned = 0; if (!warned++) warning(_("object %s cannot be read"), oid_to_hex(&src_entry->idx.oid)); /* * Those objects are not included in the * resulting pack. Be resilient and ignore * them if they can't be read, in case the * pack could be created nevertheless. */ return 0; } die(_("object %s cannot be read"), oid_to_hex(&src_entry->idx.oid)); } if (sz != src_size) die(_("object %s inconsistent object length (%"PRIuMAX" vs %"PRIuMAX")"), oid_to_hex(&src_entry->idx.oid), (uintmax_t)sz, (uintmax_t)src_size); *mem_usage += sz; } if (!src->index) { src->index = create_delta_index(src->data, src_size); if (!src->index) { static int warned = 0; if (!warned++) warning(_("suboptimal pack - out of memory")); return 0; } *mem_usage += sizeof_delta_index(src->index); } delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size); if (!delta_buf) return 0; if (DELTA(trg_entry)) { /* Prefer only shallower same-sized deltas. */ if (delta_size == DELTA_SIZE(trg_entry) && src->depth + 1 >= trg->depth) { free(delta_buf); return 0; } } /* * Handle memory allocation outside of the cache * accounting lock. Compiler will optimize the strangeness * away when NO_PTHREADS is defined. */ free(trg_entry->delta_data); cache_lock(); if (trg_entry->delta_data) { delta_cache_size -= DELTA_SIZE(trg_entry); trg_entry->delta_data = NULL; } if (delta_cacheable(src_size, trg_size, delta_size)) { delta_cache_size += delta_size; cache_unlock(); trg_entry->delta_data = xrealloc(delta_buf, delta_size); } else { cache_unlock(); free(delta_buf); } SET_DELTA(trg_entry, src_entry); SET_DELTA_SIZE(trg_entry, delta_size); trg->depth = src->depth + 1; return 1; } static unsigned int check_delta_limit(struct object_entry *me, unsigned int n) { struct object_entry *child = DELTA_CHILD(me); unsigned int m = n; while (child) { const unsigned int c = check_delta_limit(child, n + 1); if (m < c) m = c; child = DELTA_SIBLING(child); } return m; } static unsigned long free_unpacked(struct unpacked *n) { unsigned long freed_mem = sizeof_delta_index(n->index); free_delta_index(n->index); n->index = NULL; if (n->data) { freed_mem += SIZE(n->entry); FREE_AND_NULL(n->data); } n->entry = NULL; n->depth = 0; return freed_mem; } static void find_deltas(struct object_entry **list, unsigned *list_size, int window, int depth, unsigned *processed) { uint32_t i, idx = 0, count = 0; struct unpacked *array; unsigned long mem_usage = 0; CALLOC_ARRAY(array, window); for (;;) { struct object_entry *entry; struct unpacked *n = array + idx; int j, max_depth, best_base = -1; progress_lock(); if (!*list_size) { progress_unlock(); break; } entry = *list++; (*list_size)--; if (!entry->preferred_base) { (*processed)++; display_progress(progress_state, *processed); } progress_unlock(); mem_usage -= free_unpacked(n); n->entry = entry; while (window_memory_limit && mem_usage > window_memory_limit && count > 1) { const uint32_t tail = (idx + window - count) % window; mem_usage -= free_unpacked(array + tail); count--; } /* We do not compute delta to *create* objects we are not * going to pack. */ if (entry->preferred_base) goto next; /* * If the current object is at pack edge, take the depth the * objects that depend on the current object into account * otherwise they would become too deep. */ max_depth = depth; if (DELTA_CHILD(entry)) { max_depth -= check_delta_limit(entry, 0); if (max_depth <= 0) goto next; } j = window; while (--j > 0) { int ret; uint32_t other_idx = idx + j; struct unpacked *m; if (other_idx >= window) other_idx -= window; m = array + other_idx; if (!m->entry) break; ret = try_delta(n, m, max_depth, &mem_usage); if (ret < 0) break; else if (ret > 0) best_base = other_idx; } /* * If we decided to cache the delta data, then it is best * to compress it right away. First because we have to do * it anyway, and doing it here while we're threaded will * save a lot of time in the non threaded write phase, * as well as allow for caching more deltas within * the same cache size limit. * ... * But only if not writing to stdout, since in that case * the network is most likely throttling writes anyway, * and therefore it is best to go to the write phase ASAP * instead, as we can afford spending more time compressing * between writes at that moment. */ if (entry->delta_data && !pack_to_stdout) { unsigned long size; size = do_compress(&entry->delta_data, DELTA_SIZE(entry)); if (size < (1U << OE_Z_DELTA_BITS)) { entry->z_delta_size = size; cache_lock(); delta_cache_size -= DELTA_SIZE(entry); delta_cache_size += entry->z_delta_size; cache_unlock(); } else { FREE_AND_NULL(entry->delta_data); entry->z_delta_size = 0; } } /* if we made n a delta, and if n is already at max * depth, leaving it in the window is pointless. we * should evict it first. */ if (DELTA(entry) && max_depth <= n->depth) continue; /* * Move the best delta base up in the window, after the * currently deltified object, to keep it longer. It will * be the first base object to be attempted next. */ if (DELTA(entry)) { struct unpacked swap = array[best_base]; int dist = (window + idx - best_base) % window; int dst = best_base; while (dist--) { int src = (dst + 1) % window; array[dst] = array[src]; dst = src; } array[dst] = swap; } next: idx++; if (count + 1 < window) count++; if (idx >= window) idx = 0; } for (i = 0; i < window; ++i) { free_delta_index(array[i].index); free(array[i].data); } free(array); } /* * The main object list is split into smaller lists, each is handed to * one worker. * * The main thread waits on the condition that (at least) one of the workers * has stopped working (which is indicated in the .working member of * struct thread_params). * * When a work thread has completed its work, it sets .working to 0 and * signals the main thread and waits on the condition that .data_ready * becomes 1. * * The main thread steals half of the work from the worker that has * most work left to hand it to the idle worker. */ struct thread_params { pthread_t thread; struct object_entry **list; unsigned list_size; unsigned remaining; int window; int depth; int working; int data_ready; pthread_mutex_t mutex; pthread_cond_t cond; unsigned *processed; }; static pthread_cond_t progress_cond; /* * Mutex and conditional variable can't be statically-initialized on Windows. */ static void init_threaded_search(void) { pthread_mutex_init(&cache_mutex, NULL); pthread_mutex_init(&progress_mutex, NULL); pthread_cond_init(&progress_cond, NULL); } static void cleanup_threaded_search(void) { pthread_cond_destroy(&progress_cond); pthread_mutex_destroy(&cache_mutex); pthread_mutex_destroy(&progress_mutex); } static void *threaded_find_deltas(void *arg) { struct thread_params *me = arg; progress_lock(); while (me->remaining) { progress_unlock(); find_deltas(me->list, &me->remaining, me->window, me->depth, me->processed); progress_lock(); me->working = 0; pthread_cond_signal(&progress_cond); progress_unlock(); /* * We must not set ->data_ready before we wait on the * condition because the main thread may have set it to 1 * before we get here. In order to be sure that new * work is available if we see 1 in ->data_ready, it * was initialized to 0 before this thread was spawned * and we reset it to 0 right away. */ pthread_mutex_lock(&me->mutex); while (!me->data_ready) pthread_cond_wait(&me->cond, &me->mutex); me->data_ready = 0; pthread_mutex_unlock(&me->mutex); progress_lock(); } progress_unlock(); /* leave ->working 1 so that this doesn't get more work assigned */ return NULL; } static void ll_find_deltas(struct object_entry **list, unsigned list_size, int window, int depth, unsigned *processed) { struct thread_params *p; int i, ret, active_threads = 0; init_threaded_search(); if (delta_search_threads <= 1) { find_deltas(list, &list_size, window, depth, processed); cleanup_threaded_search(); return; } if (progress > pack_to_stdout) fprintf_ln(stderr, _("Delta compression using up to %d threads"), delta_search_threads); CALLOC_ARRAY(p, delta_search_threads); /* Partition the work amongst work threads. */ for (i = 0; i < delta_search_threads; i++) { unsigned sub_size = list_size / (delta_search_threads - i); /* don't use too small segments or no deltas will be found */ if (sub_size < 2*window && i+1 < delta_search_threads) sub_size = 0; p[i].window = window; p[i].depth = depth; p[i].processed = processed; p[i].working = 1; p[i].data_ready = 0; /* try to split chunks on "path" boundaries */ while (sub_size && sub_size < list_size && list[sub_size]->hash && list[sub_size]->hash == list[sub_size-1]->hash) sub_size++; p[i].list = list; p[i].list_size = sub_size; p[i].remaining = sub_size; list += sub_size; list_size -= sub_size; } /* Start work threads. */ for (i = 0; i < delta_search_threads; i++) { if (!p[i].list_size) continue; pthread_mutex_init(&p[i].mutex, NULL); pthread_cond_init(&p[i].cond, NULL); ret = pthread_create(&p[i].thread, NULL, threaded_find_deltas, &p[i]); if (ret) die(_("unable to create thread: %s"), strerror(ret)); active_threads++; } /* * Now let's wait for work completion. Each time a thread is done * with its work, we steal half of the remaining work from the * thread with the largest number of unprocessed objects and give * it to that newly idle thread. This ensure good load balancing * until the remaining object list segments are simply too short * to be worth splitting anymore. */ while (active_threads) { struct thread_params *target = NULL; struct thread_params *victim = NULL; unsigned sub_size = 0; progress_lock(); for (;;) { for (i = 0; !target && i < delta_search_threads; i++) if (!p[i].working) target = &p[i]; if (target) break; pthread_cond_wait(&progress_cond, &progress_mutex); } for (i = 0; i < delta_search_threads; i++) if (p[i].remaining > 2*window && (!victim || victim->remaining < p[i].remaining)) victim = &p[i]; if (victim) { sub_size = victim->remaining / 2; list = victim->list + victim->list_size - sub_size; while (sub_size && list[0]->hash && list[0]->hash == list[-1]->hash) { list++; sub_size--; } if (!sub_size) { /* * It is possible for some "paths" to have * so many objects that no hash boundary * might be found. Let's just steal the * exact half in that case. */ sub_size = victim->remaining / 2; list -= sub_size; } target->list = list; victim->list_size -= sub_size; victim->remaining -= sub_size; } target->list_size = sub_size; target->remaining = sub_size; target->working = 1; progress_unlock(); pthread_mutex_lock(&target->mutex); target->data_ready = 1; pthread_cond_signal(&target->cond); pthread_mutex_unlock(&target->mutex); if (!sub_size) { pthread_join(target->thread, NULL); pthread_cond_destroy(&target->cond); pthread_mutex_destroy(&target->mutex); active_threads--; } } cleanup_threaded_search(); free(p); } static int obj_is_packed(const struct object_id *oid) { return packlist_find(&to_pack, oid) || (reuse_packfile_bitmap && bitmap_walk_contains(bitmap_git, reuse_packfile_bitmap, oid)); } static void add_tag_chain(const struct object_id *oid) { struct tag *tag; /* * We catch duplicates already in add_object_entry(), but we'd * prefer to do this extra check to avoid having to parse the * tag at all if we already know that it's being packed (e.g., if * it was included via bitmaps, we would not have parsed it * previously). */ if (obj_is_packed(oid)) return; tag = lookup_tag(the_repository, oid); while (1) { if (!tag || parse_tag(tag) || !tag->tagged) die(_("unable to pack objects reachable from tag %s"), oid_to_hex(oid)); add_object_entry(&tag->object.oid, OBJ_TAG, NULL, 0); if (tag->tagged->type != OBJ_TAG) return; tag = (struct tag *)tag->tagged; } } static int add_ref_tag(const char *tag UNUSED, const struct object_id *oid, int flag UNUSED, void *cb_data UNUSED) { struct object_id peeled; if (!peel_iterated_oid(oid, &peeled) && obj_is_packed(&peeled)) add_tag_chain(oid); return 0; } static void prepare_pack(int window, int depth) { struct object_entry **delta_list; uint32_t i, nr_deltas; unsigned n; if (use_delta_islands) resolve_tree_islands(the_repository, progress, &to_pack); get_object_details(); /* * If we're locally repacking then we need to be doubly careful * from now on in order to make sure no stealth corruption gets * propagated to the new pack. Clients receiving streamed packs * should validate everything they get anyway so no need to incur * the additional cost here in that case. */ if (!pack_to_stdout) do_check_packed_object_crc = 1; if (!to_pack.nr_objects || !window || !depth) return; ALLOC_ARRAY(delta_list, to_pack.nr_objects); nr_deltas = n = 0; for (i = 0; i < to_pack.nr_objects; i++) { struct object_entry *entry = to_pack.objects + i; if (DELTA(entry)) /* This happens if we decided to reuse existing * delta from a pack. "reuse_delta &&" is implied. */ continue; if (!entry->type_valid || oe_size_less_than(&to_pack, entry, 50)) continue; if (entry->no_try_delta) continue; if (!entry->preferred_base) { nr_deltas++; if (oe_type(entry) < 0) die(_("unable to get type of object %s"), oid_to_hex(&entry->idx.oid)); } else { if (oe_type(entry) < 0) { /* * This object is not found, but we * don't have to include it anyway. */ continue; } } delta_list[n++] = entry; } if (nr_deltas && n > 1) { unsigned nr_done = 0; if (progress) progress_state = start_progress(_("Compressing objects"), nr_deltas); QSORT(delta_list, n, type_size_sort); ll_find_deltas(delta_list, n, window+1, depth, &nr_done); stop_progress(&progress_state); if (nr_done != nr_deltas) die(_("inconsistency with delta count")); } free(delta_list); } static int git_pack_config(const char *k, const char *v, void *cb) { if (!strcmp(k, "pack.window")) { window = git_config_int(k, v); return 0; } if (!strcmp(k, "pack.windowmemory")) { window_memory_limit = git_config_ulong(k, v); return 0; } if (!strcmp(k, "pack.depth")) { depth = git_config_int(k, v); return 0; } if (!strcmp(k, "pack.deltacachesize")) { max_delta_cache_size = git_config_int(k, v); return 0; } if (!strcmp(k, "pack.deltacachelimit")) { cache_max_small_delta_size = git_config_int(k, v); return 0; } if (!strcmp(k, "pack.writebitmaphashcache")) { if (git_config_bool(k, v)) write_bitmap_options |= BITMAP_OPT_HASH_CACHE; else write_bitmap_options &= ~BITMAP_OPT_HASH_CACHE; } if (!strcmp(k, "pack.writebitmaplookuptable")) { if (git_config_bool(k, v)) write_bitmap_options |= BITMAP_OPT_LOOKUP_TABLE; else write_bitmap_options &= ~BITMAP_OPT_LOOKUP_TABLE; } if (!strcmp(k, "pack.usebitmaps")) { use_bitmap_index_default = git_config_bool(k, v); return 0; } if (!strcmp(k, "pack.allowpackreuse")) { allow_pack_reuse = git_config_bool(k, v); return 0; } if (!strcmp(k, "pack.threads")) { delta_search_threads = git_config_int(k, v); if (delta_search_threads < 0) die(_("invalid number of threads specified (%d)"), delta_search_threads); if (!HAVE_THREADS && delta_search_threads != 1) { warning(_("no threads support, ignoring %s"), k); delta_search_threads = 0; } return 0; } if (!strcmp(k, "pack.indexversion")) { pack_idx_opts.version = git_config_int(k, v); if (pack_idx_opts.version > 2) die(_("bad pack.indexVersion=%"PRIu32), pack_idx_opts.version); return 0; } if (!strcmp(k, "pack.writereverseindex")) { if (git_config_bool(k, v)) pack_idx_opts.flags |= WRITE_REV; else pack_idx_opts.flags &= ~WRITE_REV; return 0; } if (!strcmp(k, "uploadpack.blobpackfileuri")) { struct configured_exclusion *ex = xmalloc(sizeof(*ex)); const char *oid_end, *pack_end; /* * Stores the pack hash. This is not a true object ID, but is * of the same form. */ struct object_id pack_hash; if (parse_oid_hex(v, &ex->e.oid, &oid_end) || *oid_end != ' ' || parse_oid_hex(oid_end + 1, &pack_hash, &pack_end) || *pack_end != ' ') die(_("value of uploadpack.blobpackfileuri must be " "of the form ' ' (got '%s')"), v); if (oidmap_get(&configured_exclusions, &ex->e.oid)) die(_("object already configured in another " "uploadpack.blobpackfileuri (got '%s')"), v); ex->pack_hash_hex = xcalloc(1, pack_end - oid_end); memcpy(ex->pack_hash_hex, oid_end + 1, pack_end - oid_end - 1); ex->uri = xstrdup(pack_end + 1); oidmap_put(&configured_exclusions, ex); } return git_default_config(k, v, cb); } /* Counters for trace2 output when in --stdin-packs mode. */ static int stdin_packs_found_nr; static int stdin_packs_hints_nr; static int add_object_entry_from_pack(const struct object_id *oid, struct packed_git *p, uint32_t pos, void *_data) { off_t ofs; enum object_type type = OBJ_NONE; display_progress(progress_state, ++nr_seen); if (have_duplicate_entry(oid, 0)) return 0; ofs = nth_packed_object_offset(p, pos); if (!want_object_in_pack(oid, 0, &p, &ofs)) return 0; if (p) { struct rev_info *revs = _data; struct object_info oi = OBJECT_INFO_INIT; oi.typep = &type; if (packed_object_info(the_repository, p, ofs, &oi) < 0) { die(_("could not get type of object %s in pack %s"), oid_to_hex(oid), p->pack_name); } else if (type == OBJ_COMMIT) { /* * commits in included packs are used as starting points for the * subsequent revision walk */ add_pending_oid(revs, NULL, oid, 0); } stdin_packs_found_nr++; } create_object_entry(oid, type, 0, 0, 0, p, ofs); return 0; } static void show_commit_pack_hint(struct commit *commit UNUSED, void *data UNUSED) { /* nothing to do; commits don't have a namehash */ } static void show_object_pack_hint(struct object *object, const char *name, void *data UNUSED) { struct object_entry *oe = packlist_find(&to_pack, &object->oid); if (!oe) return; /* * Our 'to_pack' list was constructed by iterating all objects packed in * included packs, and so doesn't have a non-zero hash field that you * would typically pick up during a reachability traversal. * * Make a best-effort attempt to fill in the ->hash and ->no_try_delta * here using a now in order to perhaps improve the delta selection * process. */ oe->hash = pack_name_hash(name); oe->no_try_delta = name && no_try_delta(name); stdin_packs_hints_nr++; } static int pack_mtime_cmp(const void *_a, const void *_b) { struct packed_git *a = ((const struct string_list_item*)_a)->util; struct packed_git *b = ((const struct string_list_item*)_b)->util; /* * order packs by descending mtime so that objects are laid out * roughly as newest-to-oldest */ if (a->mtime < b->mtime) return 1; else if (b->mtime < a->mtime) return -1; else return 0; } static void read_packs_list_from_stdin(void) { struct strbuf buf = STRBUF_INIT; struct string_list include_packs = STRING_LIST_INIT_DUP; struct string_list exclude_packs = STRING_LIST_INIT_DUP; struct string_list_item *item = NULL; struct packed_git *p; struct rev_info revs; repo_init_revisions(the_repository, &revs, NULL); /* * Use a revision walk to fill in the namehash of objects in the include * packs. To save time, we'll avoid traversing through objects that are * in excluded packs. * * That may cause us to avoid populating all of the namehash fields of * all included objects, but our goal is best-effort, since this is only * an optimization during delta selection. */ revs.no_kept_objects = 1; revs.keep_pack_cache_flags |= IN_CORE_KEEP_PACKS; revs.blob_objects = 1; revs.tree_objects = 1; revs.tag_objects = 1; revs.ignore_missing_links = 1; while (strbuf_getline(&buf, stdin) != EOF) { if (!buf.len) continue; if (*buf.buf == '^') string_list_append(&exclude_packs, buf.buf + 1); else string_list_append(&include_packs, buf.buf); strbuf_reset(&buf); } string_list_sort(&include_packs); string_list_sort(&exclude_packs); for (p = get_all_packs(the_repository); p; p = p->next) { const char *pack_name = pack_basename(p); item = string_list_lookup(&include_packs, pack_name); if (!item) item = string_list_lookup(&exclude_packs, pack_name); if (item) item->util = p; } /* * Arguments we got on stdin may not even be packs. First * check that to avoid segfaulting later on in * e.g. pack_mtime_cmp(), excluded packs are handled below. * * Since we first parsed our STDIN and then sorted the input * lines the pack we error on will be whatever line happens to * sort first. This is lazy, it's enough that we report one * bad case here, we don't need to report the first/last one, * or all of them. */ for_each_string_list_item(item, &include_packs) { struct packed_git *p = item->util; if (!p) die(_("could not find pack '%s'"), item->string); if (!is_pack_valid(p)) die(_("packfile %s cannot be accessed"), p->pack_name); } /* * Then, handle all of the excluded packs, marking them as * kept in-core so that later calls to add_object_entry() * discards any objects that are also found in excluded packs. */ for_each_string_list_item(item, &exclude_packs) { struct packed_git *p = item->util; if (!p) die(_("could not find pack '%s'"), item->string); p->pack_keep_in_core = 1; } /* * Order packs by ascending mtime; use QSORT directly to access the * string_list_item's ->util pointer, which string_list_sort() does not * provide. */ QSORT(include_packs.items, include_packs.nr, pack_mtime_cmp); for_each_string_list_item(item, &include_packs) { struct packed_git *p = item->util; for_each_object_in_pack(p, add_object_entry_from_pack, &revs, FOR_EACH_OBJECT_PACK_ORDER); } if (prepare_revision_walk(&revs)) die(_("revision walk setup failed")); traverse_commit_list(&revs, show_commit_pack_hint, show_object_pack_hint, NULL); trace2_data_intmax("pack-objects", the_repository, "stdin_packs_found", stdin_packs_found_nr); trace2_data_intmax("pack-objects", the_repository, "stdin_packs_hints", stdin_packs_hints_nr); strbuf_release(&buf); string_list_clear(&include_packs, 0); string_list_clear(&exclude_packs, 0); } static void add_cruft_object_entry(const struct object_id *oid, enum object_type type, struct packed_git *pack, off_t offset, const char *name, uint32_t mtime) { struct object_entry *entry; display_progress(progress_state, ++nr_seen); entry = packlist_find(&to_pack, oid); if (entry) { if (name) { entry->hash = pack_name_hash(name); entry->no_try_delta = no_try_delta(name); } } else { if (!want_object_in_pack(oid, 0, &pack, &offset)) return; if (!pack && type == OBJ_BLOB && !has_loose_object(oid)) { /* * If a traversed tree has a missing blob then we want * to avoid adding that missing object to our pack. * * This only applies to missing blobs, not trees, * because the traversal needs to parse sub-trees but * not blobs. * * Note we only perform this check when we couldn't * already find the object in a pack, so we're really * limited to "ensure non-tip blobs which don't exist in * packs do exist via loose objects". Confused? */ return; } entry = create_object_entry(oid, type, pack_name_hash(name), 0, name && no_try_delta(name), pack, offset); } if (mtime > oe_cruft_mtime(&to_pack, entry)) oe_set_cruft_mtime(&to_pack, entry, mtime); return; } static void show_cruft_object(struct object *obj, const char *name, void *data UNUSED) { /* * if we did not record it earlier, it's at least as old as our * expiration value. Rather than find it exactly, just use that * value. This may bump it forward from its real mtime, but it * will still be "too old" next time we run with the same * expiration. * * if obj does appear in the packing list, this call is a noop (or may * set the namehash). */ add_cruft_object_entry(&obj->oid, obj->type, NULL, 0, name, cruft_expiration); } static void show_cruft_commit(struct commit *commit, void *data) { show_cruft_object((struct object*)commit, NULL, data); } static int cruft_include_check_obj(struct object *obj, void *data UNUSED) { return !has_object_kept_pack(&obj->oid, IN_CORE_KEEP_PACKS); } static int cruft_include_check(struct commit *commit, void *data) { return cruft_include_check_obj((struct object*)commit, data); } static void set_cruft_mtime(const struct object *object, struct packed_git *pack, off_t offset, time_t mtime) { add_cruft_object_entry(&object->oid, object->type, pack, offset, NULL, mtime); } static void mark_pack_kept_in_core(struct string_list *packs, unsigned keep) { struct string_list_item *item = NULL; for_each_string_list_item(item, packs) { struct packed_git *p = item->util; if (!p) die(_("could not find pack '%s'"), item->string); p->pack_keep_in_core = keep; } } static void add_unreachable_loose_objects(void); static void add_objects_in_unpacked_packs(void); static void enumerate_cruft_objects(void) { if (progress) progress_state = start_progress(_("Enumerating cruft objects"), 0); add_objects_in_unpacked_packs(); add_unreachable_loose_objects(); stop_progress(&progress_state); } static void enumerate_and_traverse_cruft_objects(struct string_list *fresh_packs) { struct packed_git *p; struct rev_info revs; int ret; repo_init_revisions(the_repository, &revs, NULL); revs.tag_objects = 1; revs.tree_objects = 1; revs.blob_objects = 1; revs.include_check = cruft_include_check; revs.include_check_obj = cruft_include_check_obj; revs.ignore_missing_links = 1; if (progress) progress_state = start_progress(_("Enumerating cruft objects"), 0); ret = add_unseen_recent_objects_to_traversal(&revs, cruft_expiration, set_cruft_mtime, 1); stop_progress(&progress_state); if (ret) die(_("unable to add cruft objects")); /* * Re-mark only the fresh packs as kept so that objects in * unknown packs do not halt the reachability traversal early. */ for (p = get_all_packs(the_repository); p; p = p->next) p->pack_keep_in_core = 0; mark_pack_kept_in_core(fresh_packs, 1); if (prepare_revision_walk(&revs)) die(_("revision walk setup failed")); if (progress) progress_state = start_progress(_("Traversing cruft objects"), 0); nr_seen = 0; traverse_commit_list(&revs, show_cruft_commit, show_cruft_object, NULL); stop_progress(&progress_state); } static void read_cruft_objects(void) { struct strbuf buf = STRBUF_INIT; struct string_list discard_packs = STRING_LIST_INIT_DUP; struct string_list fresh_packs = STRING_LIST_INIT_DUP; struct packed_git *p; ignore_packed_keep_in_core = 1; while (strbuf_getline(&buf, stdin) != EOF) { if (!buf.len) continue; if (*buf.buf == '-') string_list_append(&discard_packs, buf.buf + 1); else string_list_append(&fresh_packs, buf.buf); strbuf_reset(&buf); } string_list_sort(&discard_packs); string_list_sort(&fresh_packs); for (p = get_all_packs(the_repository); p; p = p->next) { const char *pack_name = pack_basename(p); struct string_list_item *item; item = string_list_lookup(&fresh_packs, pack_name); if (!item) item = string_list_lookup(&discard_packs, pack_name); if (item) { item->util = p; } else { /* * This pack wasn't mentioned in either the "fresh" or * "discard" list, so the caller didn't know about it. * * Mark it as kept so that its objects are ignored by * add_unseen_recent_objects_to_traversal(). We'll * unmark it before starting the traversal so it doesn't * halt the traversal early. */ p->pack_keep_in_core = 1; } } mark_pack_kept_in_core(&fresh_packs, 1); mark_pack_kept_in_core(&discard_packs, 0); if (cruft_expiration) enumerate_and_traverse_cruft_objects(&fresh_packs); else enumerate_cruft_objects(); strbuf_release(&buf); string_list_clear(&discard_packs, 0); string_list_clear(&fresh_packs, 0); } static void read_object_list_from_stdin(void) { char line[GIT_MAX_HEXSZ + 1 + PATH_MAX + 2]; struct object_id oid; const char *p; for (;;) { if (!fgets(line, sizeof(line), stdin)) { if (feof(stdin)) break; if (!ferror(stdin)) BUG("fgets returned NULL, not EOF, not error!"); if (errno != EINTR) die_errno("fgets"); clearerr(stdin); continue; } if (line[0] == '-') { if (get_oid_hex(line+1, &oid)) die(_("expected edge object ID, got garbage:\n %s"), line); add_preferred_base(&oid); continue; } if (parse_oid_hex(line, &oid, &p)) die(_("expected object ID, got garbage:\n %s"), line); add_preferred_base_object(p + 1); add_object_entry(&oid, OBJ_NONE, p + 1, 0); } } static void show_commit(struct commit *commit, void *data UNUSED) { add_object_entry(&commit->object.oid, OBJ_COMMIT, NULL, 0); if (write_bitmap_index) index_commit_for_bitmap(commit); if (use_delta_islands) propagate_island_marks(commit); } static void show_object(struct object *obj, const char *name, void *data UNUSED) { add_preferred_base_object(name); add_object_entry(&obj->oid, obj->type, name, 0); if (use_delta_islands) { const char *p; unsigned depth; struct object_entry *ent; /* the empty string is a root tree, which is depth 0 */ depth = *name ? 1 : 0; for (p = strchr(name, '/'); p; p = strchr(p + 1, '/')) depth++; ent = packlist_find(&to_pack, &obj->oid); if (ent && depth > oe_tree_depth(&to_pack, ent)) oe_set_tree_depth(&to_pack, ent, depth); } } static void show_object__ma_allow_any(struct object *obj, const char *name, void *data) { assert(arg_missing_action == MA_ALLOW_ANY); /* * Quietly ignore ALL missing objects. This avoids problems with * staging them now and getting an odd error later. */ if (!has_object(the_repository, &obj->oid, 0)) return; show_object(obj, name, data); } static void show_object__ma_allow_promisor(struct object *obj, const char *name, void *data) { assert(arg_missing_action == MA_ALLOW_PROMISOR); /* * Quietly ignore EXPECTED missing objects. This avoids problems with * staging them now and getting an odd error later. */ if (!has_object(the_repository, &obj->oid, 0) && is_promisor_object(&obj->oid)) return; show_object(obj, name, data); } static int option_parse_missing_action(const struct option *opt, const char *arg, int unset) { assert(arg); assert(!unset); if (!strcmp(arg, "error")) { arg_missing_action = MA_ERROR; fn_show_object = show_object; return 0; } if (!strcmp(arg, "allow-any")) { arg_missing_action = MA_ALLOW_ANY; fetch_if_missing = 0; fn_show_object = show_object__ma_allow_any; return 0; } if (!strcmp(arg, "allow-promisor")) { arg_missing_action = MA_ALLOW_PROMISOR; fetch_if_missing = 0; fn_show_object = show_object__ma_allow_promisor; return 0; } die(_("invalid value for '%s': '%s'"), "--missing", arg); return 0; } static void show_edge(struct commit *commit) { add_preferred_base(&commit->object.oid); } static int add_object_in_unpacked_pack(const struct object_id *oid, struct packed_git *pack, uint32_t pos, void *data UNUSED) { if (cruft) { off_t offset; time_t mtime; if (pack->is_cruft) { if (load_pack_mtimes(pack) < 0) die(_("could not load cruft pack .mtimes")); mtime = nth_packed_mtime(pack, pos); } else { mtime = pack->mtime; } offset = nth_packed_object_offset(pack, pos); add_cruft_object_entry(oid, OBJ_NONE, pack, offset, NULL, mtime); } else { add_object_entry(oid, OBJ_NONE, "", 0); } return 0; } static void add_objects_in_unpacked_packs(void) { if (for_each_packed_object(add_object_in_unpacked_pack, NULL, FOR_EACH_OBJECT_PACK_ORDER | FOR_EACH_OBJECT_LOCAL_ONLY | FOR_EACH_OBJECT_SKIP_IN_CORE_KEPT_PACKS | FOR_EACH_OBJECT_SKIP_ON_DISK_KEPT_PACKS)) die(_("cannot open pack index")); } static int add_loose_object(const struct object_id *oid, const char *path, void *data UNUSED) { enum object_type type = oid_object_info(the_repository, oid, NULL); if (type < 0) { warning(_("loose object at %s could not be examined"), path); return 0; } if (cruft) { struct stat st; if (stat(path, &st) < 0) { if (errno == ENOENT) return 0; return error_errno("unable to stat %s", oid_to_hex(oid)); } add_cruft_object_entry(oid, type, NULL, 0, NULL, st.st_mtime); } else { add_object_entry(oid, type, "", 0); } return 0; } /* * We actually don't even have to worry about reachability here. * add_object_entry will weed out duplicates, so we just add every * loose object we find. */ static void add_unreachable_loose_objects(void) { for_each_loose_file_in_objdir(get_object_directory(), add_loose_object, NULL, NULL, NULL); } static int has_sha1_pack_kept_or_nonlocal(const struct object_id *oid) { static struct packed_git *last_found = (void *)1; struct packed_git *p; p = (last_found != (void *)1) ? last_found : get_all_packs(the_repository); while (p) { if ((!p->pack_local || p->pack_keep || p->pack_keep_in_core) && find_pack_entry_one(oid->hash, p)) { last_found = p; return 1; } if (p == last_found) p = get_all_packs(the_repository); else p = p->next; if (p == last_found) p = p->next; } return 0; } /* * Store a list of sha1s that are should not be discarded * because they are either written too recently, or are * reachable from another object that was. * * This is filled by get_object_list. */ static struct oid_array recent_objects; static int loosened_object_can_be_discarded(const struct object_id *oid, timestamp_t mtime) { if (!unpack_unreachable_expiration) return 0; if (mtime > unpack_unreachable_expiration) return 0; if (oid_array_lookup(&recent_objects, oid) >= 0) return 0; return 1; } static void loosen_unused_packed_objects(void) { struct packed_git *p; uint32_t i; uint32_t loosened_objects_nr = 0; struct object_id oid; for (p = get_all_packs(the_repository); p; p = p->next) { if (!p->pack_local || p->pack_keep || p->pack_keep_in_core) continue; if (open_pack_index(p)) die(_("cannot open pack index")); for (i = 0; i < p->num_objects; i++) { nth_packed_object_id(&oid, p, i); if (!packlist_find(&to_pack, &oid) && !has_sha1_pack_kept_or_nonlocal(&oid) && !loosened_object_can_be_discarded(&oid, p->mtime)) { if (force_object_loose(&oid, p->mtime)) die(_("unable to force loose object")); loosened_objects_nr++; } } } trace2_data_intmax("pack-objects", the_repository, "loosen_unused_packed_objects/loosened", loosened_objects_nr); } /* * This tracks any options which pack-reuse code expects to be on, or which a * reader of the pack might not understand, and which would therefore prevent * blind reuse of what we have on disk. */ static int pack_options_allow_reuse(void) { return allow_pack_reuse && pack_to_stdout && !ignore_packed_keep_on_disk && !ignore_packed_keep_in_core && (!local || !have_non_local_packs) && !incremental; } static int get_object_list_from_bitmap(struct rev_info *revs) { if (!(bitmap_git = prepare_bitmap_walk(revs, 0))) return -1; if (pack_options_allow_reuse() && !reuse_partial_packfile_from_bitmap( bitmap_git, &reuse_packfile, &reuse_packfile_objects, &reuse_packfile_bitmap)) { assert(reuse_packfile_objects); nr_result += reuse_packfile_objects; nr_seen += reuse_packfile_objects; display_progress(progress_state, nr_seen); } traverse_bitmap_commit_list(bitmap_git, revs, &add_object_entry_from_bitmap); return 0; } static void record_recent_object(struct object *obj, const char *name UNUSED, void *data UNUSED) { oid_array_append(&recent_objects, &obj->oid); } static void record_recent_commit(struct commit *commit, void *data UNUSED) { oid_array_append(&recent_objects, &commit->object.oid); } static int mark_bitmap_preferred_tip(const char *refname, const struct object_id *oid, int flags UNUSED, void *data UNUSED) { struct object_id peeled; struct object *object; if (!peel_iterated_oid(oid, &peeled)) oid = &peeled; object = parse_object_or_die(oid, refname); if (object->type == OBJ_COMMIT) object->flags |= NEEDS_BITMAP; return 0; } static void mark_bitmap_preferred_tips(void) { struct string_list_item *item; const struct string_list *preferred_tips; preferred_tips = bitmap_preferred_tips(the_repository); if (!preferred_tips) return; for_each_string_list_item(item, preferred_tips) { for_each_ref_in(item->string, mark_bitmap_preferred_tip, NULL); } } static void get_object_list(struct rev_info *revs, int ac, const char **av) { struct setup_revision_opt s_r_opt = { .allow_exclude_promisor_objects = 1, }; char line[1000]; int flags = 0; int save_warning; save_commit_buffer = 0; setup_revisions(ac, av, revs, &s_r_opt); /* make sure shallows are read */ is_repository_shallow(the_repository); save_warning = warn_on_object_refname_ambiguity; warn_on_object_refname_ambiguity = 0; while (fgets(line, sizeof(line), stdin) != NULL) { int len = strlen(line); if (len && line[len - 1] == '\n') line[--len] = 0; if (!len) break; if (*line == '-') { if (!strcmp(line, "--not")) { flags ^= UNINTERESTING; write_bitmap_index = 0; continue; } if (starts_with(line, "--shallow ")) { struct object_id oid; if (get_oid_hex(line + 10, &oid)) die("not an object name '%s'", line + 10); register_shallow(the_repository, &oid); use_bitmap_index = 0; continue; } die(_("not a rev '%s'"), line); } if (handle_revision_arg(line, revs, flags, REVARG_CANNOT_BE_FILENAME)) die(_("bad revision '%s'"), line); } warn_on_object_refname_ambiguity = save_warning; if (use_bitmap_index && !get_object_list_from_bitmap(revs)) return; if (use_delta_islands) load_delta_islands(the_repository, progress); if (write_bitmap_index) mark_bitmap_preferred_tips(); if (prepare_revision_walk(revs)) die(_("revision walk setup failed")); mark_edges_uninteresting(revs, show_edge, sparse); if (!fn_show_object) fn_show_object = show_object; traverse_commit_list(revs, show_commit, fn_show_object, NULL); if (unpack_unreachable_expiration) { revs->ignore_missing_links = 1; if (add_unseen_recent_objects_to_traversal(revs, unpack_unreachable_expiration, NULL, 0)) die(_("unable to add recent objects")); if (prepare_revision_walk(revs)) die(_("revision walk setup failed")); traverse_commit_list(revs, record_recent_commit, record_recent_object, NULL); } if (keep_unreachable) add_objects_in_unpacked_packs(); if (pack_loose_unreachable) add_unreachable_loose_objects(); if (unpack_unreachable) loosen_unused_packed_objects(); oid_array_clear(&recent_objects); } static void add_extra_kept_packs(const struct string_list *names) { struct packed_git *p; if (!names->nr) return; for (p = get_all_packs(the_repository); p; p = p->next) { const char *name = basename(p->pack_name); int i; if (!p->pack_local) continue; for (i = 0; i < names->nr; i++) if (!fspathcmp(name, names->items[i].string)) break; if (i < names->nr) { p->pack_keep_in_core = 1; ignore_packed_keep_in_core = 1; continue; } } } static int option_parse_index_version(const struct option *opt, const char *arg, int unset) { char *c; const char *val = arg; BUG_ON_OPT_NEG(unset); pack_idx_opts.version = strtoul(val, &c, 10); if (pack_idx_opts.version > 2) die(_("unsupported index version %s"), val); if (*c == ',' && c[1]) pack_idx_opts.off32_limit = strtoul(c+1, &c, 0); if (*c || pack_idx_opts.off32_limit & 0x80000000) die(_("bad index version '%s'"), val); return 0; } static int option_parse_unpack_unreachable(const struct option *opt, const char *arg, int unset) { if (unset) { unpack_unreachable = 0; unpack_unreachable_expiration = 0; } else { unpack_unreachable = 1; if (arg) unpack_unreachable_expiration = approxidate(arg); } return 0; } static int option_parse_cruft_expiration(const struct option *opt, const char *arg, int unset) { if (unset) { cruft = 0; cruft_expiration = 0; } else { cruft = 1; if (arg) cruft_expiration = approxidate(arg); } return 0; } int cmd_pack_objects(int argc, const char **argv, const char *prefix) { int use_internal_rev_list = 0; int shallow = 0; int all_progress_implied = 0; struct strvec rp = STRVEC_INIT; int rev_list_unpacked = 0, rev_list_all = 0, rev_list_reflog = 0; int rev_list_index = 0; int stdin_packs = 0; struct string_list keep_pack_list = STRING_LIST_INIT_NODUP; struct list_objects_filter_options filter_options = LIST_OBJECTS_FILTER_INIT; struct option pack_objects_options[] = { OPT_SET_INT('q', "quiet", &progress, N_("do not show progress meter"), 0), OPT_SET_INT(0, "progress", &progress, N_("show progress meter"), 1), OPT_SET_INT(0, "all-progress", &progress, N_("show progress meter during object writing phase"), 2), OPT_BOOL(0, "all-progress-implied", &all_progress_implied, N_("similar to --all-progress when progress meter is shown")), OPT_CALLBACK_F(0, "index-version", NULL, N_("[,]"), N_("write the pack index file in the specified idx format version"), PARSE_OPT_NONEG, option_parse_index_version), OPT_MAGNITUDE(0, "max-pack-size", &pack_size_limit, N_("maximum size of each output pack file")), OPT_BOOL(0, "local", &local, N_("ignore borrowed objects from alternate object store")), OPT_BOOL(0, "incremental", &incremental, N_("ignore packed objects")), OPT_INTEGER(0, "window", &window, N_("limit pack window by objects")), OPT_MAGNITUDE(0, "window-memory", &window_memory_limit, N_("limit pack window by memory in addition to object limit")), OPT_INTEGER(0, "depth", &depth, N_("maximum length of delta chain allowed in the resulting pack")), OPT_BOOL(0, "reuse-delta", &reuse_delta, N_("reuse existing deltas")), OPT_BOOL(0, "reuse-object", &reuse_object, N_("reuse existing objects")), OPT_BOOL(0, "delta-base-offset", &allow_ofs_delta, N_("use OFS_DELTA objects")), OPT_INTEGER(0, "threads", &delta_search_threads, N_("use threads when searching for best delta matches")), OPT_BOOL(0, "non-empty", &non_empty, N_("do not create an empty pack output")), OPT_BOOL(0, "revs", &use_internal_rev_list, N_("read revision arguments from standard input")), OPT_SET_INT_F(0, "unpacked", &rev_list_unpacked, N_("limit the objects to those that are not yet packed"), 1, PARSE_OPT_NONEG), OPT_SET_INT_F(0, "all", &rev_list_all, N_("include objects reachable from any reference"), 1, PARSE_OPT_NONEG), OPT_SET_INT_F(0, "reflog", &rev_list_reflog, N_("include objects referred by reflog entries"), 1, PARSE_OPT_NONEG), OPT_SET_INT_F(0, "indexed-objects", &rev_list_index, N_("include objects referred to by the index"), 1, PARSE_OPT_NONEG), OPT_BOOL(0, "stdin-packs", &stdin_packs, N_("read packs from stdin")), OPT_BOOL(0, "stdout", &pack_to_stdout, N_("output pack to stdout")), OPT_BOOL(0, "include-tag", &include_tag, N_("include tag objects that refer to objects to be packed")), OPT_BOOL(0, "keep-unreachable", &keep_unreachable, N_("keep unreachable objects")), OPT_BOOL(0, "pack-loose-unreachable", &pack_loose_unreachable, N_("pack loose unreachable objects")), OPT_CALLBACK_F(0, "unpack-unreachable", NULL, N_("time"), N_("unpack unreachable objects newer than