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3da492f808
As alluded to in the previous patch, the code in patch-ids.c is using the hashmaps API wrong. Luckily we do not have a bug, as all hashmap functionality that we use here (hashmap_get) passes through the keydata. If hashmap_get_next were to be used, a bug would occur as that passes NULL for the key_data. So instead use the hashmap API correctly and provide the caller required data in the compare function via the first argument that always gets passed and was setup via the hashmap_init function. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
118 lines
3.1 KiB
C
118 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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struct object_id *oid, 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_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);
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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 diff_options *opt,
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struct patch_id *a,
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struct patch_id *b,
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const void *unused_keydata)
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{
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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))
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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))
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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 oidcmp(&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,
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&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(&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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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))
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return -1;
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hashmap_entry_init(patch, sha1hash(header_only_patch_id.hash));
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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, 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);
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return key;
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}
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