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![Junio C Hamano](/assets/img/avatar_default.png)
Mark-up unused parameters in the code so that we can eventually enable -Wunused-parameter by default. * jk/unused-parameter: t/helper: mark unused callback void data parameters tag: mark unused parameters in each_tag_name_fn callbacks rev-parse: mark unused parameter in for_each_abbrev callback replace: mark unused parameter in each_mergetag_fn callback replace: mark unused parameter in ref callback merge-tree: mark unused parameter in traverse callback fsck: mark unused parameters in various fsck callbacks revisions: drop unused "opt" parameter in "tweak" callbacks count-objects: mark unused parameter in alternates callback am: mark unused keep_cr parameters http-push: mark unused parameter in xml callback http: mark unused parameters in curl callbacks do_for_each_ref_helper(): mark unused repository parameter test-ref-store: drop unimplemented reflog-expire command
694 lines
16 KiB
C
694 lines
16 KiB
C
#include "builtin.h"
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#include "bulk-checkin.h"
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#include "config.h"
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#include "environment.h"
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#include "gettext.h"
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#include "git-zlib.h"
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#include "hex.h"
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#include "object-store-ll.h"
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#include "object.h"
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#include "delta.h"
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#include "pack.h"
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#include "blob.h"
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#include "commit.h"
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#include "replace-object.h"
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#include "strbuf.h"
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#include "tag.h"
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#include "tree.h"
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#include "tree-walk.h"
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#include "progress.h"
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#include "decorate.h"
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#include "fsck.h"
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static int dry_run, quiet, recover, has_errors, strict;
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static const char unpack_usage[] = "git unpack-objects [-n] [-q] [-r] [--strict]";
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/* We always read in 4kB chunks. */
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static unsigned char buffer[4096];
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static unsigned int offset, len;
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static off_t consumed_bytes;
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static off_t max_input_size;
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static git_hash_ctx ctx;
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static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
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static struct progress *progress;
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/*
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* When running under --strict mode, objects whose reachability are
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* suspect are kept in core without getting written in the object
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* store.
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*/
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struct obj_buffer {
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char *buffer;
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unsigned long size;
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};
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static struct decoration obj_decorate;
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static struct obj_buffer *lookup_object_buffer(struct object *base)
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{
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return lookup_decoration(&obj_decorate, base);
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}
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static void add_object_buffer(struct object *object, char *buffer, unsigned long size)
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{
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struct obj_buffer *obj;
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CALLOC_ARRAY(obj, 1);
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obj->buffer = buffer;
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obj->size = size;
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if (add_decoration(&obj_decorate, object, obj))
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die("object %s tried to add buffer twice!", oid_to_hex(&object->oid));
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}
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/*
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* Make sure at least "min" bytes are available in the buffer, and
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* return the pointer to the buffer.
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*/
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static void *fill(int min)
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{
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if (min <= len)
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return buffer + offset;
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if (min > sizeof(buffer))
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die("cannot fill %d bytes", min);
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if (offset) {
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the_hash_algo->update_fn(&ctx, buffer, offset);
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memmove(buffer, buffer + offset, len);
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offset = 0;
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}
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do {
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ssize_t ret = xread(0, buffer + len, sizeof(buffer) - len);
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if (ret <= 0) {
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if (!ret)
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die("early EOF");
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die_errno("read error on input");
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}
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len += ret;
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} while (len < min);
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return buffer;
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}
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static void use(int bytes)
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{
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if (bytes > len)
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die("used more bytes than were available");
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len -= bytes;
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offset += bytes;
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/* make sure off_t is sufficiently large not to wrap */
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if (signed_add_overflows(consumed_bytes, bytes))
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die("pack too large for current definition of off_t");
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consumed_bytes += bytes;
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if (max_input_size && consumed_bytes > max_input_size)
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die(_("pack exceeds maximum allowed size"));
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display_throughput(progress, consumed_bytes);
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}
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/*
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* Decompress zstream from the standard input into a newly
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* allocated buffer of specified size and return the buffer.
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* The caller is responsible to free the returned buffer.
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*
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* But for dry_run mode, "get_data()" is only used to check the
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* integrity of data, and the returned buffer is not used at all.
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* Therefore, in dry_run mode, "get_data()" will release the small
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* allocated buffer which is reused to hold temporary zstream output
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* and return NULL instead of returning garbage data.
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*/
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static void *get_data(unsigned long size)
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{
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git_zstream stream;
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unsigned long bufsize = dry_run && size > 8192 ? 8192 : size;
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void *buf = xmallocz(bufsize);
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memset(&stream, 0, sizeof(stream));
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stream.next_out = buf;
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stream.avail_out = bufsize;
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stream.next_in = fill(1);
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stream.avail_in = len;
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git_inflate_init(&stream);
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for (;;) {
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int ret = git_inflate(&stream, 0);
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use(len - stream.avail_in);
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if (stream.total_out == size && ret == Z_STREAM_END)
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break;
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if (ret != Z_OK) {
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error("inflate returned %d", ret);
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FREE_AND_NULL(buf);
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if (!recover)
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exit(1);
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has_errors = 1;
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break;
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}
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stream.next_in = fill(1);
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stream.avail_in = len;
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if (dry_run) {
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/* reuse the buffer in dry_run mode */
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stream.next_out = buf;
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stream.avail_out = bufsize > size - stream.total_out ?
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size - stream.total_out :
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bufsize;
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}
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}
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git_inflate_end(&stream);
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if (dry_run)
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FREE_AND_NULL(buf);
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return buf;
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}
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struct delta_info {
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struct object_id base_oid;
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unsigned nr;
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off_t base_offset;
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unsigned long size;
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void *delta;
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struct delta_info *next;
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};
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static struct delta_info *delta_list;
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static void add_delta_to_list(unsigned nr, const struct object_id *base_oid,
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off_t base_offset,
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void *delta, unsigned long size)
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{
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struct delta_info *info = xmalloc(sizeof(*info));
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oidcpy(&info->base_oid, base_oid);
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info->base_offset = base_offset;
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info->size = size;
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info->delta = delta;
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info->nr = nr;
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info->next = delta_list;
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delta_list = info;
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}
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struct obj_info {
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off_t offset;
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struct object_id oid;
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struct object *obj;
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};
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/* Remember to update object flag allocation in object.h */
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#define FLAG_OPEN (1u<<20)
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#define FLAG_WRITTEN (1u<<21)
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static struct obj_info *obj_list;
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static unsigned nr_objects;
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/*
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* Called only from check_object() after it verified this object
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* is Ok.
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*/
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static void write_cached_object(struct object *obj, struct obj_buffer *obj_buf)
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{
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struct object_id oid;
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if (write_object_file(obj_buf->buffer, obj_buf->size,
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obj->type, &oid) < 0)
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die("failed to write object %s", oid_to_hex(&obj->oid));
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obj->flags |= FLAG_WRITTEN;
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}
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/*
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* At the very end of the processing, write_rest() scans the objects
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* that have reachability requirements and calls this function.
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* Verify its reachability and validity recursively and write it out.
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*/
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static int check_object(struct object *obj, enum object_type type,
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void *data UNUSED,
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struct fsck_options *options UNUSED)
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{
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struct obj_buffer *obj_buf;
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if (!obj)
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return 1;
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if (obj->flags & FLAG_WRITTEN)
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return 0;
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if (type != OBJ_ANY && obj->type != type)
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die("object type mismatch");
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if (!(obj->flags & FLAG_OPEN)) {
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unsigned long size;
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int type = oid_object_info(the_repository, &obj->oid, &size);
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if (type != obj->type || type <= 0)
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die("object of unexpected type");
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obj->flags |= FLAG_WRITTEN;
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return 0;
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}
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obj_buf = lookup_object_buffer(obj);
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if (!obj_buf)
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die("Whoops! Cannot find object '%s'", oid_to_hex(&obj->oid));
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if (fsck_object(obj, obj_buf->buffer, obj_buf->size, &fsck_options))
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die("fsck error in packed object");
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fsck_options.walk = check_object;
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if (fsck_walk(obj, NULL, &fsck_options))
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die("Error on reachable objects of %s", oid_to_hex(&obj->oid));
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write_cached_object(obj, obj_buf);
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return 0;
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}
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static void write_rest(void)
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{
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unsigned i;
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for (i = 0; i < nr_objects; i++) {
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if (obj_list[i].obj)
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check_object(obj_list[i].obj, OBJ_ANY, NULL, NULL);
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}
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}
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static void added_object(unsigned nr, enum object_type type,
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void *data, unsigned long size);
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/*
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* Write out nr-th object from the list, now we know the contents
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* of it. Under --strict, this buffers structured objects in-core,
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* to be checked at the end.
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*/
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static void write_object(unsigned nr, enum object_type type,
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void *buf, unsigned long size)
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{
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if (!strict) {
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if (write_object_file(buf, size, type,
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&obj_list[nr].oid) < 0)
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die("failed to write object");
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added_object(nr, type, buf, size);
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free(buf);
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obj_list[nr].obj = NULL;
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} else if (type == OBJ_BLOB) {
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struct blob *blob;
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if (write_object_file(buf, size, type,
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&obj_list[nr].oid) < 0)
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die("failed to write object");
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added_object(nr, type, buf, size);
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free(buf);
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blob = lookup_blob(the_repository, &obj_list[nr].oid);
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if (blob)
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blob->object.flags |= FLAG_WRITTEN;
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else
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die("invalid blob object");
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obj_list[nr].obj = NULL;
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} else {
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struct object *obj;
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int eaten;
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hash_object_file(the_hash_algo, buf, size, type,
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&obj_list[nr].oid);
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added_object(nr, type, buf, size);
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obj = parse_object_buffer(the_repository, &obj_list[nr].oid,
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type, size, buf,
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&eaten);
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if (!obj)
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die("invalid %s", type_name(type));
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add_object_buffer(obj, buf, size);
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obj->flags |= FLAG_OPEN;
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obj_list[nr].obj = obj;
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}
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}
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static void resolve_delta(unsigned nr, enum object_type type,
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void *base, unsigned long base_size,
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void *delta, unsigned long delta_size)
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{
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void *result;
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unsigned long result_size;
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result = patch_delta(base, base_size,
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delta, delta_size,
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&result_size);
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if (!result)
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die("failed to apply delta");
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free(delta);
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write_object(nr, type, result, result_size);
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}
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/*
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* We now know the contents of an object (which is nr-th in the pack);
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* resolve all the deltified objects that are based on it.
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*/
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static void added_object(unsigned nr, enum object_type type,
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void *data, unsigned long size)
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{
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struct delta_info **p = &delta_list;
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struct delta_info *info;
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while ((info = *p) != NULL) {
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if (oideq(&info->base_oid, &obj_list[nr].oid) ||
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info->base_offset == obj_list[nr].offset) {
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*p = info->next;
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p = &delta_list;
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resolve_delta(info->nr, type, data, size,
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info->delta, info->size);
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free(info);
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continue;
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}
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p = &info->next;
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}
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}
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static void unpack_non_delta_entry(enum object_type type, unsigned long size,
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unsigned nr)
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{
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void *buf = get_data(size);
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if (buf)
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write_object(nr, type, buf, size);
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}
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struct input_zstream_data {
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git_zstream *zstream;
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unsigned char buf[8192];
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int status;
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};
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static const void *feed_input_zstream(struct input_stream *in_stream,
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unsigned long *readlen)
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{
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struct input_zstream_data *data = in_stream->data;
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git_zstream *zstream = data->zstream;
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void *in = fill(1);
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if (in_stream->is_finished) {
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*readlen = 0;
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return NULL;
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}
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zstream->next_out = data->buf;
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zstream->avail_out = sizeof(data->buf);
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zstream->next_in = in;
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zstream->avail_in = len;
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data->status = git_inflate(zstream, 0);
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in_stream->is_finished = data->status != Z_OK;
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use(len - zstream->avail_in);
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*readlen = sizeof(data->buf) - zstream->avail_out;
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return data->buf;
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}
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static void stream_blob(unsigned long size, unsigned nr)
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{
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git_zstream zstream = { 0 };
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struct input_zstream_data data = { 0 };
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struct input_stream in_stream = {
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.read = feed_input_zstream,
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.data = &data,
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};
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struct obj_info *info = &obj_list[nr];
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data.zstream = &zstream;
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git_inflate_init(&zstream);
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if (stream_loose_object(&in_stream, size, &info->oid))
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die(_("failed to write object in stream"));
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if (data.status != Z_STREAM_END)
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die(_("inflate returned (%d)"), data.status);
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git_inflate_end(&zstream);
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if (strict) {
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struct blob *blob = lookup_blob(the_repository, &info->oid);
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if (!blob)
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die(_("invalid blob object from stream"));
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blob->object.flags |= FLAG_WRITTEN;
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}
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info->obj = NULL;
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}
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static int resolve_against_held(unsigned nr, const struct object_id *base,
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void *delta_data, unsigned long delta_size)
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{
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struct object *obj;
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struct obj_buffer *obj_buffer;
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obj = lookup_object(the_repository, base);
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if (!obj)
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return 0;
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obj_buffer = lookup_object_buffer(obj);
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if (!obj_buffer)
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return 0;
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resolve_delta(nr, obj->type, obj_buffer->buffer,
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obj_buffer->size, delta_data, delta_size);
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return 1;
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}
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static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
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unsigned nr)
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{
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void *delta_data, *base;
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unsigned long base_size;
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struct object_id base_oid;
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if (type == OBJ_REF_DELTA) {
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oidread(&base_oid, fill(the_hash_algo->rawsz));
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use(the_hash_algo->rawsz);
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delta_data = get_data(delta_size);
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if (!delta_data)
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return;
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if (repo_has_object_file(the_repository, &base_oid))
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; /* Ok we have this one */
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else if (resolve_against_held(nr, &base_oid,
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delta_data, delta_size))
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return; /* we are done */
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else {
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/* cannot resolve yet --- queue it */
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oidclr(&obj_list[nr].oid);
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add_delta_to_list(nr, &base_oid, 0, delta_data, delta_size);
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return;
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}
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} else {
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unsigned base_found = 0;
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unsigned char *pack, c;
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off_t base_offset;
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unsigned lo, mid, hi;
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pack = fill(1);
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c = *pack;
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use(1);
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base_offset = c & 127;
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while (c & 128) {
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base_offset += 1;
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if (!base_offset || MSB(base_offset, 7))
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die("offset value overflow for delta base object");
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pack = fill(1);
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c = *pack;
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use(1);
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base_offset = (base_offset << 7) + (c & 127);
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}
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base_offset = obj_list[nr].offset - base_offset;
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if (base_offset <= 0 || base_offset >= obj_list[nr].offset)
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die("offset value out of bound for delta base object");
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delta_data = get_data(delta_size);
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if (!delta_data)
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return;
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lo = 0;
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hi = nr;
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while (lo < hi) {
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mid = lo + (hi - lo) / 2;
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if (base_offset < obj_list[mid].offset) {
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hi = mid;
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} else if (base_offset > obj_list[mid].offset) {
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lo = mid + 1;
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} else {
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oidcpy(&base_oid, &obj_list[mid].oid);
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base_found = !is_null_oid(&base_oid);
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break;
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}
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}
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if (!base_found) {
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/*
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* The delta base object is itself a delta that
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* has not been resolved yet.
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*/
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oidclr(&obj_list[nr].oid);
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add_delta_to_list(nr, null_oid(), base_offset,
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delta_data, delta_size);
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return;
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}
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}
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if (resolve_against_held(nr, &base_oid, delta_data, delta_size))
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return;
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base = repo_read_object_file(the_repository, &base_oid, &type,
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&base_size);
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if (!base) {
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error("failed to read delta-pack base object %s",
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oid_to_hex(&base_oid));
|
|
if (!recover)
|
|
exit(1);
|
|
has_errors = 1;
|
|
return;
|
|
}
|
|
resolve_delta(nr, type, base, base_size, delta_data, delta_size);
|
|
free(base);
|
|
}
|
|
|
|
static void unpack_one(unsigned nr)
|
|
{
|
|
unsigned shift;
|
|
unsigned char *pack;
|
|
unsigned long size, c;
|
|
enum object_type type;
|
|
|
|
obj_list[nr].offset = consumed_bytes;
|
|
|
|
pack = fill(1);
|
|
c = *pack;
|
|
use(1);
|
|
type = (c >> 4) & 7;
|
|
size = (c & 15);
|
|
shift = 4;
|
|
while (c & 0x80) {
|
|
pack = fill(1);
|
|
c = *pack;
|
|
use(1);
|
|
size += (c & 0x7f) << shift;
|
|
shift += 7;
|
|
}
|
|
|
|
switch (type) {
|
|
case OBJ_BLOB:
|
|
if (!dry_run && size > big_file_threshold) {
|
|
stream_blob(size, nr);
|
|
return;
|
|
}
|
|
/* fallthrough */
|
|
case OBJ_COMMIT:
|
|
case OBJ_TREE:
|
|
case OBJ_TAG:
|
|
unpack_non_delta_entry(type, size, nr);
|
|
return;
|
|
case OBJ_REF_DELTA:
|
|
case OBJ_OFS_DELTA:
|
|
unpack_delta_entry(type, size, nr);
|
|
return;
|
|
default:
|
|
error("bad object type %d", type);
|
|
has_errors = 1;
|
|
if (recover)
|
|
return;
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static void unpack_all(void)
|
|
{
|
|
int i;
|
|
struct pack_header *hdr = fill(sizeof(struct pack_header));
|
|
|
|
nr_objects = ntohl(hdr->hdr_entries);
|
|
|
|
if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
|
|
die("bad pack file");
|
|
if (!pack_version_ok(hdr->hdr_version))
|
|
die("unknown pack file version %"PRIu32,
|
|
ntohl(hdr->hdr_version));
|
|
use(sizeof(struct pack_header));
|
|
|
|
if (!quiet)
|
|
progress = start_progress(_("Unpacking objects"), nr_objects);
|
|
CALLOC_ARRAY(obj_list, nr_objects);
|
|
begin_odb_transaction();
|
|
for (i = 0; i < nr_objects; i++) {
|
|
unpack_one(i);
|
|
display_progress(progress, i + 1);
|
|
}
|
|
end_odb_transaction();
|
|
stop_progress(&progress);
|
|
|
|
if (delta_list)
|
|
die("unresolved deltas left after unpacking");
|
|
}
|
|
|
|
int cmd_unpack_objects(int argc, const char **argv, const char *prefix UNUSED)
|
|
{
|
|
int i;
|
|
struct object_id oid;
|
|
|
|
disable_replace_refs();
|
|
|
|
git_config(git_default_config, NULL);
|
|
|
|
quiet = !isatty(2);
|
|
|
|
for (i = 1 ; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
|
|
if (*arg == '-') {
|
|
if (!strcmp(arg, "-n")) {
|
|
dry_run = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "-q")) {
|
|
quiet = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "-r")) {
|
|
recover = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--strict")) {
|
|
strict = 1;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--strict=", &arg)) {
|
|
strict = 1;
|
|
fsck_set_msg_types(&fsck_options, arg);
|
|
continue;
|
|
}
|
|
if (starts_with(arg, "--pack_header=")) {
|
|
struct pack_header *hdr;
|
|
char *c;
|
|
|
|
hdr = (struct pack_header *)buffer;
|
|
hdr->hdr_signature = htonl(PACK_SIGNATURE);
|
|
hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
|
|
if (*c != ',')
|
|
die("bad %s", arg);
|
|
hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
|
|
if (*c)
|
|
die("bad %s", arg);
|
|
len = sizeof(*hdr);
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--max-input-size=", &arg)) {
|
|
max_input_size = strtoumax(arg, NULL, 10);
|
|
continue;
|
|
}
|
|
usage(unpack_usage);
|
|
}
|
|
|
|
/* We don't take any non-flag arguments now.. Maybe some day */
|
|
usage(unpack_usage);
|
|
}
|
|
the_hash_algo->init_fn(&ctx);
|
|
unpack_all();
|
|
the_hash_algo->update_fn(&ctx, buffer, offset);
|
|
the_hash_algo->final_oid_fn(&oid, &ctx);
|
|
if (strict) {
|
|
write_rest();
|
|
if (fsck_finish(&fsck_options))
|
|
die(_("fsck error in pack objects"));
|
|
}
|
|
if (!hasheq(fill(the_hash_algo->rawsz), oid.hash))
|
|
die("final sha1 did not match");
|
|
use(the_hash_algo->rawsz);
|
|
|
|
/* Write the last part of the buffer to stdout */
|
|
while (len) {
|
|
int ret = xwrite(1, buffer + offset, len);
|
|
if (ret <= 0)
|
|
break;
|
|
len -= ret;
|
|
offset += ret;
|
|
}
|
|
|
|
/* All done */
|
|
return has_errors;
|
|
}
|