Git 2.10
[git/git.git] / patch-ids.c
CommitLineData
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1#include "cache.h"
2#include "diff.h"
3#include "commit.h"
5289bae1 4#include "sha1-lookup.h"
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5#include "patch-ids.h"
6
ded2c097 7int commit_patch_id(struct commit *commit, struct diff_options *options,
b3dfeebb 8 unsigned char *sha1, int diff_header_only)
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9{
10 if (commit->parents)
ed1c9977 11 diff_tree_sha1(commit->parents->item->object.oid.hash,
12 commit->object.oid.hash, "", options);
5d23e133 13 else
ed1c9977 14 diff_root_tree_sha1(commit->object.oid.hash, "", options);
5d23e133 15 diffcore_std(options);
b3dfeebb 16 return diff_flush_patch_id(options, sha1, diff_header_only);
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17}
18
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19/*
20 * When we cannot load the full patch-id for both commits for whatever
21 * reason, the function returns -1 (i.e. return error(...)). Despite
22 * the "cmp" in the name of this function, the caller only cares about
23 * the return value being zero (a and b are equivalent) or non-zero (a
24 * and b are different), and returning non-zero would keep both in the
25 * result, even if they actually were equivalent, in order to err on
26 * the side of safety. The actual value being negative does not have
27 * any significance; only that it is non-zero matters.
28 */
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29static int patch_id_cmp(struct patch_id *a,
30 struct patch_id *b,
b3dfeebb 31 struct diff_options *opt)
5d23e133 32{
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33 if (is_null_sha1(a->patch_id) &&
34 commit_patch_id(a->commit, opt, a->patch_id, 0))
35 return error("Could not get patch ID for %s",
36 oid_to_hex(&a->commit->object.oid));
37 if (is_null_sha1(b->patch_id) &&
38 commit_patch_id(b->commit, opt, b->patch_id, 0))
39 return error("Could not get patch ID for %s",
40 oid_to_hex(&b->commit->object.oid));
dfb7a1b4 41 return hashcmp(a->patch_id, b->patch_id);
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42}
43
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44int init_patch_ids(struct patch_ids *ids)
45{
46 memset(ids, 0, sizeof(*ids));
47 diff_setup(&ids->diffopts);
8f67f8ae 48 DIFF_OPT_SET(&ids->diffopts, RECURSIVE);
28452655 49 diff_setup_done(&ids->diffopts);
dfb7a1b4 50 hashmap_init(&ids->patches, (hashmap_cmp_fn)patch_id_cmp, 256);
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51 return 0;
52}
53
54int free_patch_ids(struct patch_ids *ids)
55{
dfb7a1b4 56 hashmap_free(&ids->patches, 1);
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57 return 0;
58}
59
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60static int init_patch_id_entry(struct patch_id *patch,
61 struct commit *commit,
62 struct patch_ids *ids)
5d23e133 63{
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64 unsigned char header_only_patch_id[GIT_SHA1_RAWSZ];
65
683f17ec 66 patch->commit = commit;
b3dfeebb 67 if (commit_patch_id(commit, &ids->diffopts, header_only_patch_id, 1))
dfb7a1b4 68 return -1;
5d23e133 69
b3dfeebb 70 hashmap_entry_init(patch, sha1hash(header_only_patch_id));
dfb7a1b4 71 return 0;
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72}
73
74struct patch_id *has_commit_patch_id(struct commit *commit,
75 struct patch_ids *ids)
76{
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77 struct patch_id patch;
78
79 memset(&patch, 0, sizeof(patch));
80 if (init_patch_id_entry(&patch, commit, ids))
81 return NULL;
82
b3dfeebb 83 return hashmap_get(&ids->patches, &patch, &ids->diffopts);
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84}
85
86struct patch_id *add_commit_patch_id(struct commit *commit,
87 struct patch_ids *ids)
88{
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89 struct patch_id *key = xcalloc(1, sizeof(*key));
90
91 if (init_patch_id_entry(key, commit, ids)) {
92 free(key);
93 return NULL;
94 }
95
96 hashmap_add(&ids->patches, key);
97 return key;
5d23e133 98}