diff options
Diffstat (limited to 'reachable.c')
| -rw-r--r-- | reachable.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/reachable.c b/reachable.c new file mode 100644 index 0000000..b515fa2 --- /dev/null +++ b/reachable.c @@ -0,0 +1,226 @@ +#include "cache.h" +#include "refs.h" +#include "tag.h" +#include "commit.h" +#include "blob.h" +#include "diff.h" +#include "revision.h" +#include "reachable.h" +#include "cache-tree.h" + +static void process_blob(struct blob *blob, + struct object_array *p, + struct name_path *path, + const char *name) +{ + struct object *obj = &blob->object; + + if (!blob) + die("bad blob object"); + if (obj->flags & SEEN) + return; + obj->flags |= SEEN; + /* Nothing to do, really .. The blob lookup was the important part */ +} + +static void process_gitlink(const unsigned char *sha1, + struct object_array *p, + struct name_path *path, + const char *name) +{ + /* I don't think we want to recurse into this, really. */ +} + +static void process_tree(struct tree *tree, + struct object_array *p, + struct name_path *path, + const char *name) +{ + struct object *obj = &tree->object; + struct tree_desc desc; + struct name_entry entry; + struct name_path me; + + if (!tree) + die("bad tree object"); + if (obj->flags & SEEN) + return; + obj->flags |= SEEN; + if (parse_tree(tree) < 0) + die("bad tree object %s", sha1_to_hex(obj->sha1)); + add_object(obj, p, path, name); + me.up = path; + me.elem = name; + me.elem_len = strlen(name); + + init_tree_desc(&desc, tree->buffer, tree->size); + + while (tree_entry(&desc, &entry)) { + if (S_ISDIR(entry.mode)) + process_tree(lookup_tree(entry.sha1), p, &me, entry.path); + else if (S_ISGITLINK(entry.mode)) + process_gitlink(entry.sha1, p, &me, entry.path); + else + process_blob(lookup_blob(entry.sha1), p, &me, entry.path); + } + free(tree->buffer); + tree->buffer = NULL; +} + +static void process_tag(struct tag *tag, struct object_array *p, const char *name) +{ + struct object *obj = &tag->object; + struct name_path me; + + if (obj->flags & SEEN) + return; + obj->flags |= SEEN; + + me.up = NULL; + me.elem = "tag:/"; + me.elem_len = 5; + + if (parse_tag(tag) < 0) + die("bad tag object %s", sha1_to_hex(obj->sha1)); + if (tag->tagged) + add_object(tag->tagged, p, NULL, name); +} + +static void walk_commit_list(struct rev_info *revs) +{ + int i; + struct commit *commit; + struct object_array objects = { 0, 0, NULL }; + + /* Walk all commits, process their trees */ + while ((commit = get_revision(revs)) != NULL) + process_tree(commit->tree, &objects, NULL, ""); + + /* Then walk all the pending objects, recursively processing them too */ + for (i = 0; i < revs->pending.nr; i++) { + struct object_array_entry *pending = revs->pending.objects + i; + struct object *obj = pending->item; + const char *name = pending->name; + if (obj->type == OBJ_TAG) { + process_tag((struct tag *) obj, &objects, name); + continue; + } + if (obj->type == OBJ_TREE) { + process_tree((struct tree *)obj, &objects, NULL, name); + continue; + } + if (obj->type == OBJ_BLOB) { + process_blob((struct blob *)obj, &objects, NULL, name); + continue; + } + die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name); + } +} + +static int add_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1, + const char *email, unsigned long timestamp, int tz, + const char *message, void *cb_data) +{ + struct object *object; + struct rev_info *revs = (struct rev_info *)cb_data; + + object = parse_object(osha1); + if (object) + add_pending_object(revs, object, ""); + object = parse_object(nsha1); + if (object) + add_pending_object(revs, object, ""); + return 0; +} + +static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data) +{ + struct object *object = parse_object(sha1); + struct rev_info *revs = (struct rev_info *)cb_data; + + if (!object) + die("bad object ref: %s:%s", path, sha1_to_hex(sha1)); + add_pending_object(revs, object, ""); + + return 0; +} + +static int add_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data) +{ + for_each_reflog_ent(path, add_one_reflog_ent, cb_data); + return 0; +} + +static void add_one_tree(const unsigned char *sha1, struct rev_info *revs) +{ + struct tree *tree = lookup_tree(sha1); + if (tree) + add_pending_object(revs, &tree->object, ""); +} + +static void add_cache_tree(struct cache_tree *it, struct rev_info *revs) +{ + int i; + + if (it->entry_count >= 0) + add_one_tree(it->sha1, revs); + for (i = 0; i < it->subtree_nr; i++) + add_cache_tree(it->down[i]->cache_tree, revs); +} + +static void add_cache_refs(struct rev_info *revs) +{ + int i; + + read_cache(); + for (i = 0; i < active_nr; i++) { + /* + * The index can contain blobs and GITLINKs, GITLINKs are hashes + * that don't actually point to objects in the repository, it's + * almost guaranteed that they are NOT blobs, so we don't call + * lookup_blob() on them, to avoid populating the hash table + * with invalid information + */ + if (S_ISGITLINK(active_cache[i]->ce_mode)) + continue; + + lookup_blob(active_cache[i]->sha1); + /* + * We could add the blobs to the pending list, but quite + * frankly, we don't care. Once we've looked them up, and + * added them as objects, we've really done everything + * there is to do for a blob + */ + } + if (active_cache_tree) + add_cache_tree(active_cache_tree, revs); +} + +void mark_reachable_objects(struct rev_info *revs, int mark_reflog) +{ + /* + * Set up revision parsing, and mark us as being interested + * in all object types, not just commits. + */ + revs->tag_objects = 1; + revs->blob_objects = 1; + revs->tree_objects = 1; + + /* Add all refs from the index file */ + add_cache_refs(revs); + + /* Add all external refs */ + for_each_ref(add_one_ref, revs); + + /* Add all reflog info */ + if (mark_reflog) + for_each_reflog(add_one_reflog, revs); + + /* + * Set up the revision walk - this will move all commits + * from the pending list to the commit walking list. + */ + if (prepare_revision_walk(revs)) + die("revision walk setup failed"); + walk_commit_list(revs); +} |