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![Jeff King](/assets/img/avatar_default.png)
In some cases it's useful for efficiency reasons to get the type of an object before deciding whether to parse it, but we still want an object struct. E.g., in reachable.c, bitmaps give us the type, but we just want to mark flags on each object. Likewise, we may loop over every object and only parse tags in order to peel them; checking the type first lets us avoid parsing the non-tags. But our lookup_blob(), etc, functions make getting an object struct annoying: we have to call the right function for every type. And we cannot just use the generic lookup_object(), because it only returns an already-seen object; it won't allocate a new object struct. Let's provide a function that dispatches to the correct lookup_* function based on a run-time type. In fact, reachable.c already has such a helper, so we'll just make that public. I did change the return type from "void *" to "struct object *". While the former is a clever way to avoid casting inside the function, it's less safe and less informative to people reading the function declaration. The next commit will add a new caller. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
229 lines
5.4 KiB
C
229 lines
5.4 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "tag.h"
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#include "commit.h"
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#include "blob.h"
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#include "diff.h"
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#include "revision.h"
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#include "reachable.h"
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#include "cache-tree.h"
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#include "progress.h"
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#include "list-objects.h"
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#include "packfile.h"
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#include "worktree.h"
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#include "object-store.h"
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#include "pack-bitmap.h"
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struct connectivity_progress {
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struct progress *progress;
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unsigned long count;
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};
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static void update_progress(struct connectivity_progress *cp)
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{
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cp->count++;
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if ((cp->count & 1023) == 0)
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display_progress(cp->progress, cp->count);
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}
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static int add_one_ref(const char *path, const struct object_id *oid,
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int flag, void *cb_data)
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{
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struct rev_info *revs = (struct rev_info *)cb_data;
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struct object *object;
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if ((flag & REF_ISSYMREF) && (flag & REF_ISBROKEN)) {
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warning("symbolic ref is dangling: %s", path);
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return 0;
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}
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object = parse_object_or_die(oid, path);
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add_pending_object(revs, object, "");
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return 0;
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}
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/*
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* The traversal will have already marked us as SEEN, so we
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* only need to handle any progress reporting here.
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*/
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static void mark_object(struct object *obj, const char *name, void *data)
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{
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update_progress(data);
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}
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static void mark_commit(struct commit *c, void *data)
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{
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mark_object(&c->object, NULL, data);
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}
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struct recent_data {
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struct rev_info *revs;
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timestamp_t timestamp;
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};
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static void add_recent_object(const struct object_id *oid,
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timestamp_t mtime,
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struct recent_data *data)
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{
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struct object *obj;
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enum object_type type;
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if (mtime <= data->timestamp)
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return;
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/*
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* We do not want to call parse_object here, because
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* inflating blobs and trees could be very expensive.
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* However, we do need to know the correct type for
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* later processing, and the revision machinery expects
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* commits and tags to have been parsed.
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*/
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type = oid_object_info(the_repository, oid, NULL);
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if (type < 0)
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die("unable to get object info for %s", oid_to_hex(oid));
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switch (type) {
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case OBJ_TAG:
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case OBJ_COMMIT:
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obj = parse_object_or_die(oid, NULL);
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break;
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case OBJ_TREE:
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obj = (struct object *)lookup_tree(the_repository, oid);
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break;
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case OBJ_BLOB:
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obj = (struct object *)lookup_blob(the_repository, oid);
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break;
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default:
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die("unknown object type for %s: %s",
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oid_to_hex(oid), type_name(type));
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}
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if (!obj)
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die("unable to lookup %s", oid_to_hex(oid));
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add_pending_object(data->revs, obj, "");
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}
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static int add_recent_loose(const struct object_id *oid,
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const char *path, void *data)
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{
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struct stat st;
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struct object *obj = lookup_object(the_repository, oid);
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if (obj && obj->flags & SEEN)
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return 0;
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if (stat(path, &st) < 0) {
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/*
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* It's OK if an object went away during our iteration; this
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* could be due to a simultaneous repack. But anything else
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* we should abort, since we might then fail to mark objects
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* which should not be pruned.
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*/
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if (errno == ENOENT)
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return 0;
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return error_errno("unable to stat %s", oid_to_hex(oid));
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}
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add_recent_object(oid, st.st_mtime, data);
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return 0;
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}
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static int add_recent_packed(const struct object_id *oid,
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struct packed_git *p, uint32_t pos,
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void *data)
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{
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struct object *obj = lookup_object(the_repository, oid);
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if (obj && obj->flags & SEEN)
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return 0;
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add_recent_object(oid, p->mtime, data);
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return 0;
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}
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int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
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timestamp_t timestamp)
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{
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struct recent_data data;
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int r;
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data.revs = revs;
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data.timestamp = timestamp;
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r = for_each_loose_object(add_recent_loose, &data,
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FOR_EACH_OBJECT_LOCAL_ONLY);
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if (r)
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return r;
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return for_each_packed_object(add_recent_packed, &data,
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FOR_EACH_OBJECT_LOCAL_ONLY);
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}
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static int mark_object_seen(const struct object_id *oid,
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enum object_type type,
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int exclude,
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uint32_t name_hash,
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struct packed_git *found_pack,
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off_t found_offset)
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{
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struct object *obj = lookup_object_by_type(the_repository, oid, type);
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if (!obj)
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die("unable to create object '%s'", oid_to_hex(oid));
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obj->flags |= SEEN;
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return 0;
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}
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void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
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timestamp_t mark_recent, struct progress *progress)
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{
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struct connectivity_progress cp;
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struct bitmap_index *bitmap_git;
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/*
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* Set up revision parsing, and mark us as being interested
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* in all object types, not just commits.
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*/
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revs->tag_objects = 1;
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revs->blob_objects = 1;
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revs->tree_objects = 1;
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/* Add all refs from the index file */
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add_index_objects_to_pending(revs, 0);
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/* Add all external refs */
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for_each_ref(add_one_ref, revs);
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/* detached HEAD is not included in the list above */
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head_ref(add_one_ref, revs);
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other_head_refs(add_one_ref, revs);
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/* Add all reflog info */
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if (mark_reflog)
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add_reflogs_to_pending(revs, 0);
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cp.progress = progress;
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cp.count = 0;
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bitmap_git = prepare_bitmap_walk(revs, NULL, 0);
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if (bitmap_git) {
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traverse_bitmap_commit_list(bitmap_git, revs, mark_object_seen);
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free_bitmap_index(bitmap_git);
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} else {
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if (prepare_revision_walk(revs))
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die("revision walk setup failed");
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traverse_commit_list(revs, mark_commit, mark_object, &cp);
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}
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if (mark_recent) {
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revs->ignore_missing_links = 1;
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if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
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die("unable to mark recent objects");
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if (prepare_revision_walk(revs))
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die("revision walk setup failed");
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traverse_commit_list(revs, mark_commit, mark_object, &cp);
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}
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display_progress(cp.progress, cp.count);
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}
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