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114 lines
3.1 KiB
114 lines
3.1 KiB
#include "cache.h" |
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#include "diff.h" |
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#include "commit.h" |
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#include "sha1-lookup.h" |
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#include "patch-ids.h" |
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static int patch_id_defined(struct commit *commit) |
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{ |
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/* must be 0 or 1 parents */ |
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return !commit->parents || !commit->parents->next; |
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} |
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int commit_patch_id(struct commit *commit, struct diff_options *options, |
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unsigned char *sha1, int diff_header_only) |
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{ |
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if (!patch_id_defined(commit)) |
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return -1; |
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if (commit->parents) |
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diff_tree_sha1(commit->parents->item->object.oid.hash, |
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commit->object.oid.hash, "", options); |
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else |
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diff_root_tree_sha1(commit->object.oid.hash, "", options); |
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diffcore_std(options); |
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return diff_flush_patch_id(options, sha1, diff_header_only); |
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} |
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/* |
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* When we cannot load the full patch-id for both commits for whatever |
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* reason, the function returns -1 (i.e. return error(...)). Despite |
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* the "cmp" in the name of this function, the caller only cares about |
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* the return value being zero (a and b are equivalent) or non-zero (a |
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* and b are different), and returning non-zero would keep both in the |
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* result, even if they actually were equivalent, in order to err on |
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* the side of safety. The actual value being negative does not have |
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* any significance; only that it is non-zero matters. |
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*/ |
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static int patch_id_cmp(struct patch_id *a, |
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struct patch_id *b, |
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struct diff_options *opt) |
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{ |
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if (is_null_sha1(a->patch_id) && |
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commit_patch_id(a->commit, opt, a->patch_id, 0)) |
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return error("Could not get patch ID for %s", |
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oid_to_hex(&a->commit->object.oid)); |
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if (is_null_sha1(b->patch_id) && |
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commit_patch_id(b->commit, opt, b->patch_id, 0)) |
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return error("Could not get patch ID for %s", |
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oid_to_hex(&b->commit->object.oid)); |
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return hashcmp(a->patch_id, b->patch_id); |
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} |
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int init_patch_ids(struct patch_ids *ids) |
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{ |
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memset(ids, 0, sizeof(*ids)); |
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diff_setup(&ids->diffopts); |
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ids->diffopts.detect_rename = 0; |
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DIFF_OPT_SET(&ids->diffopts, RECURSIVE); |
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diff_setup_done(&ids->diffopts); |
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hashmap_init(&ids->patches, (hashmap_cmp_fn)patch_id_cmp, 256); |
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return 0; |
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} |
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int free_patch_ids(struct patch_ids *ids) |
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{ |
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hashmap_free(&ids->patches, 1); |
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return 0; |
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} |
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static int init_patch_id_entry(struct patch_id *patch, |
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struct commit *commit, |
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struct patch_ids *ids) |
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{ |
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unsigned char header_only_patch_id[GIT_SHA1_RAWSZ]; |
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patch->commit = commit; |
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if (commit_patch_id(commit, &ids->diffopts, header_only_patch_id, 1)) |
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return -1; |
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hashmap_entry_init(patch, sha1hash(header_only_patch_id)); |
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return 0; |
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} |
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struct patch_id *has_commit_patch_id(struct commit *commit, |
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struct patch_ids *ids) |
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{ |
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struct patch_id patch; |
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if (!patch_id_defined(commit)) |
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return NULL; |
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memset(&patch, 0, sizeof(patch)); |
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if (init_patch_id_entry(&patch, commit, ids)) |
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return NULL; |
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return hashmap_get(&ids->patches, &patch, &ids->diffopts); |
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} |
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struct patch_id *add_commit_patch_id(struct commit *commit, |
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struct patch_ids *ids) |
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{ |
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struct patch_id *key = xcalloc(1, sizeof(*key)); |
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if (!patch_id_defined(commit)) |
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return NULL; |
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if (init_patch_id_entry(key, commit, ids)) { |
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free(key); |
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return NULL; |
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} |
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hashmap_add(&ids->patches, key); |
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return key; |
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}
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