115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
#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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