Merge branch 'rs/alias-use-copy-array'
[git/git.git] / patch-ids.c
1 #include "cache.h"
2 #include "diff.h"
3 #include "commit.h"
4 #include "sha1-lookup.h"
5 #include "patch-ids.h"
6
7 static int patch_id_defined(struct commit *commit)
8 {
9 /* must be 0 or 1 parents */
10 return !commit->parents || !commit->parents->next;
11 }
12
13 int commit_patch_id(struct commit *commit, struct diff_options *options,
14 struct object_id *oid, int diff_header_only, int stable)
15 {
16 if (!patch_id_defined(commit))
17 return -1;
18
19 if (commit->parents)
20 diff_tree_oid(&commit->parents->item->object.oid,
21 &commit->object.oid, "", options);
22 else
23 diff_root_tree_oid(&commit->object.oid, "", options);
24 diffcore_std(options);
25 return diff_flush_patch_id(options, oid, diff_header_only, stable);
26 }
27
28 /*
29 * When we cannot load the full patch-id for both commits for whatever
30 * reason, the function returns -1 (i.e. return error(...)). Despite
31 * the "neq" in the name of this function, the caller only cares about
32 * the return value being zero (a and b are equivalent) or non-zero (a
33 * and b are different), and returning non-zero would keep both in the
34 * result, even if they actually were equivalent, in order to err on
35 * the side of safety. The actual value being negative does not have
36 * any significance; only that it is non-zero matters.
37 */
38 static int patch_id_neq(const void *cmpfn_data,
39 const void *entry,
40 const void *entry_or_key,
41 const void *unused_keydata)
42 {
43 /* NEEDSWORK: const correctness? */
44 struct diff_options *opt = (void *)cmpfn_data;
45 struct patch_id *a = (void *)entry;
46 struct patch_id *b = (void *)entry_or_key;
47
48 if (is_null_oid(&a->patch_id) &&
49 commit_patch_id(a->commit, opt, &a->patch_id, 0, 0))
50 return error("Could not get patch ID for %s",
51 oid_to_hex(&a->commit->object.oid));
52 if (is_null_oid(&b->patch_id) &&
53 commit_patch_id(b->commit, opt, &b->patch_id, 0, 0))
54 return error("Could not get patch ID for %s",
55 oid_to_hex(&b->commit->object.oid));
56 return !oideq(&a->patch_id, &b->patch_id);
57 }
58
59 int init_patch_ids(struct repository *r, struct patch_ids *ids)
60 {
61 memset(ids, 0, sizeof(*ids));
62 repo_diff_setup(r, &ids->diffopts);
63 ids->diffopts.detect_rename = 0;
64 ids->diffopts.flags.recursive = 1;
65 diff_setup_done(&ids->diffopts);
66 hashmap_init(&ids->patches, patch_id_neq, &ids->diffopts, 256);
67 return 0;
68 }
69
70 int free_patch_ids(struct patch_ids *ids)
71 {
72 hashmap_free(&ids->patches, 1);
73 return 0;
74 }
75
76 static int init_patch_id_entry(struct patch_id *patch,
77 struct commit *commit,
78 struct patch_ids *ids)
79 {
80 struct object_id header_only_patch_id;
81
82 patch->commit = commit;
83 if (commit_patch_id(commit, &ids->diffopts, &header_only_patch_id, 1, 0))
84 return -1;
85
86 hashmap_entry_init(patch, oidhash(&header_only_patch_id));
87 return 0;
88 }
89
90 struct patch_id *has_commit_patch_id(struct commit *commit,
91 struct patch_ids *ids)
92 {
93 struct patch_id patch;
94
95 if (!patch_id_defined(commit))
96 return NULL;
97
98 memset(&patch, 0, sizeof(patch));
99 if (init_patch_id_entry(&patch, commit, ids))
100 return NULL;
101
102 return hashmap_get(&ids->patches, &patch, NULL);
103 }
104
105 struct patch_id *add_commit_patch_id(struct commit *commit,
106 struct patch_ids *ids)
107 {
108 struct patch_id *key;
109
110 if (!patch_id_defined(commit))
111 return NULL;
112
113 key = xcalloc(1, sizeof(*key));
114 if (init_patch_id_entry(key, commit, ids)) {
115 free(key);
116 return NULL;
117 }
118
119 hashmap_add(&ids->patches, key);
120 return key;
121 }