diff options
Diffstat (limited to 'patch-ids.c')
-rw-r--r-- | patch-ids.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/patch-ids.c b/patch-ids.c new file mode 100644 index 0000000000..b4166b0f38 --- /dev/null +++ b/patch-ids.c @@ -0,0 +1,117 @@ +#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; +} |