f4609b896f
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because there is some breakage in the git build related to the netrc credentials helper which someone has taken care of in nixpkgs. The stable channel is not used for anything other than git, so this should be fine. Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
123 lines
3.4 KiB
C
123 lines
3.4 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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struct object_id *oid, int diff_header_only, int stable)
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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_oid(&commit->parents->item->object.oid,
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&commit->object.oid, "", options);
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else
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diff_root_tree_oid(&commit->object.oid, "", options);
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diffcore_std(options);
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return diff_flush_patch_id(options, oid, diff_header_only, stable);
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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 "neq" 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_neq(const void *cmpfn_data,
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const struct hashmap_entry *eptr,
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const struct hashmap_entry *entry_or_key,
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const void *unused_keydata)
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{
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/* NEEDSWORK: const correctness? */
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struct diff_options *opt = (void *)cmpfn_data;
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struct patch_id *a, *b;
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a = container_of(eptr, struct patch_id, ent);
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b = container_of(entry_or_key, struct patch_id, ent);
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if (is_null_oid(&a->patch_id) &&
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commit_patch_id(a->commit, opt, &a->patch_id, 0, 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_oid(&b->patch_id) &&
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commit_patch_id(b->commit, opt, &b->patch_id, 0, 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 !oideq(&a->patch_id, &b->patch_id);
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}
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int init_patch_ids(struct repository *r, struct patch_ids *ids)
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{
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memset(ids, 0, sizeof(*ids));
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repo_diff_setup(r, &ids->diffopts);
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ids->diffopts.detect_rename = 0;
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ids->diffopts.flags.recursive = 1;
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diff_setup_done(&ids->diffopts);
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hashmap_init(&ids->patches, patch_id_neq, &ids->diffopts, 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_entries(&ids->patches, struct patch_id, ent);
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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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struct object_id header_only_patch_id;
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patch->commit = commit;
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if (commit_patch_id(commit, &ids->diffopts, &header_only_patch_id, 1, 0))
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return -1;
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hashmap_entry_init(&patch->ent, oidhash(&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_entry(&ids->patches, &patch, ent, NULL);
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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;
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if (!patch_id_defined(commit))
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return NULL;
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key = xcalloc(1, sizeof(*key));
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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->ent);
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return key;
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}
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