| #include "cache.h" |
| #include "diff.h" |
| #include "commit.h" |
| #include "sha1-lookup.h" |
| #include "patch-ids.h" |
| |
| static int patch_id_defined(struct commit *commit) |
| { |
| /* must be 0 or 1 parents */ |
| return !commit->parents || !commit->parents->next; |
| } |
| |
| int commit_patch_id(struct commit *commit, struct diff_options *options, |
| struct object_id *oid, int diff_header_only, int stable) |
| { |
| if (!patch_id_defined(commit)) |
| return -1; |
| |
| if (commit->parents) |
| diff_tree_oid(&commit->parents->item->object.oid, |
| &commit->object.oid, "", options); |
| else |
| diff_root_tree_oid(&commit->object.oid, "", options); |
| diffcore_std(options); |
| return diff_flush_patch_id(options, oid, diff_header_only, stable); |
| } |
| |
| /* |
| * When we cannot load the full patch-id for both commits for whatever |
| * reason, the function returns -1 (i.e. return error(...)). Despite |
| * the "neq" in the name of this function, the caller only cares about |
| * the return value being zero (a and b are equivalent) or non-zero (a |
| * and b are different), and returning non-zero would keep both in the |
| * result, even if they actually were equivalent, in order to err on |
| * the side of safety. The actual value being negative does not have |
| * any significance; only that it is non-zero matters. |
| */ |
| static int patch_id_neq(const void *cmpfn_data, |
| const struct hashmap_entry *eptr, |
| const struct hashmap_entry *entry_or_key, |
| const void *unused_keydata) |
| { |
| /* NEEDSWORK: const correctness? */ |
| struct diff_options *opt = (void *)cmpfn_data; |
| struct patch_id *a, *b; |
| |
| a = container_of(eptr, struct patch_id, ent); |
| b = container_of(entry_or_key, struct patch_id, ent); |
| |
| if (is_null_oid(&a->patch_id) && |
| commit_patch_id(a->commit, opt, &a->patch_id, 0, 0)) |
| return error("Could not get patch ID for %s", |
| oid_to_hex(&a->commit->object.oid)); |
| if (is_null_oid(&b->patch_id) && |
| commit_patch_id(b->commit, opt, &b->patch_id, 0, 0)) |
| return error("Could not get patch ID for %s", |
| oid_to_hex(&b->commit->object.oid)); |
| return !oideq(&a->patch_id, &b->patch_id); |
| } |
| |
| int init_patch_ids(struct repository *r, struct patch_ids *ids) |
| { |
| memset(ids, 0, sizeof(*ids)); |
| repo_diff_setup(r, &ids->diffopts); |
| ids->diffopts.detect_rename = 0; |
| ids->diffopts.flags.recursive = 1; |
| diff_setup_done(&ids->diffopts); |
| hashmap_init(&ids->patches, patch_id_neq, &ids->diffopts, 256); |
| return 0; |
| } |
| |
| int free_patch_ids(struct patch_ids *ids) |
| { |
| hashmap_free_entries(&ids->patches, struct patch_id, ent); |
| return 0; |
| } |
| |
| static int init_patch_id_entry(struct patch_id *patch, |
| struct commit *commit, |
| struct patch_ids *ids) |
| { |
| struct object_id header_only_patch_id; |
| |
| patch->commit = commit; |
| if (commit_patch_id(commit, &ids->diffopts, &header_only_patch_id, 1, 0)) |
| return -1; |
| |
| hashmap_entry_init(&patch->ent, oidhash(&header_only_patch_id)); |
| return 0; |
| } |
| |
| struct patch_id *has_commit_patch_id(struct commit *commit, |
| struct patch_ids *ids) |
| { |
| struct patch_id patch; |
| |
| if (!patch_id_defined(commit)) |
| return NULL; |
| |
| memset(&patch, 0, sizeof(patch)); |
| if (init_patch_id_entry(&patch, commit, ids)) |
| return NULL; |
| |
| return hashmap_get_entry(&ids->patches, &patch, ent, NULL); |
| } |
| |
| struct patch_id *add_commit_patch_id(struct commit *commit, |
| struct patch_ids *ids) |
| { |
| struct patch_id *key; |
| |
| if (!patch_id_defined(commit)) |
| return NULL; |
| |
| key = xcalloc(1, sizeof(*key)); |
| if (init_patch_id_entry(key, commit, ids)) { |
| free(key); |
| return NULL; |
| } |
| |
| hashmap_add(&ids->patches, &key->ent); |
| return key; |
| } |