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| #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) | |
| { | |
| 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); | |
| } | |
| /* | |
| * When we cannot load the full patch-id for both commits for whatever | |
| * reason, the function returns -1 (i.e. return error(...)). Despite | |
| * the "cmp" 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_cmp(struct diff_options *opt, | |
| struct patch_id *a, | |
| struct patch_id *b, | |
| const void *unused_keydata) | |
| { | |
| if (is_null_oid(&a->patch_id) && | |
| commit_patch_id(a->commit, opt, &a->patch_id, 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)) | |
| return error("Could not get patch ID for %s", | |
| oid_to_hex(&b->commit->object.oid)); | |
| return oidcmp(&a->patch_id, &b->patch_id); | |
| } | |
| int init_patch_ids(struct patch_ids *ids) | |
| { | |
| memset(ids, 0, sizeof(*ids)); | |
| diff_setup(&ids->diffopts); | |
| ids->diffopts.detect_rename = 0; | |
| DIFF_OPT_SET(&ids->diffopts, RECURSIVE); | |
| diff_setup_done(&ids->diffopts); | |
| hashmap_init(&ids->patches, (hashmap_cmp_fn)patch_id_cmp, | |
| &ids->diffopts, 256); | |
| return 0; | |
| } | |
| int free_patch_ids(struct patch_ids *ids) | |
| { | |
| hashmap_free(&ids->patches, 1); | |
| 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)) | |
| return -1; | |
| hashmap_entry_init(patch, sha1hash(header_only_patch_id.hash)); | |
| 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(&ids->patches, &patch, 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); | |
| return key; | |
| } |