| #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, |
| unsigned char *sha1, int diff_header_only) |
| { |
| if (!patch_id_defined(commit)) |
| return -1; |
| |
| if (commit->parents) |
| diff_tree_sha1(commit->parents->item->object.oid.hash, |
| commit->object.oid.hash, "", options); |
| else |
| diff_root_tree_sha1(commit->object.oid.hash, "", options); |
| diffcore_std(options); |
| return diff_flush_patch_id(options, sha1, 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 patch_id *a, |
| struct patch_id *b, |
| struct diff_options *opt) |
| { |
| if (is_null_sha1(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_sha1(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 hashcmp(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, 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) |
| { |
| unsigned char header_only_patch_id[GIT_SHA1_RAWSZ]; |
| |
| 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)); |
| 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, &ids->diffopts); |
| } |
| |
| struct patch_id *add_commit_patch_id(struct commit *commit, |
| struct patch_ids *ids) |
| { |
| struct patch_id *key = xcalloc(1, sizeof(*key)); |
| |
| if (!patch_id_defined(commit)) |
| return NULL; |
| |
| if (init_patch_id_entry(key, commit, ids)) { |
| free(key); |
| return NULL; |
| } |
| |
| hashmap_add(&ids->patches, key); |
| return key; |
| } |