Merge branch 'maint'
[git/git.git] / builtin-pack-refs.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "object.h"
4 #include "tag.h"
5
6 static const char builtin_pack_refs_usage[] =
7 "git-pack-refs [--all] [--prune]";
8
9 struct ref_to_prune {
10 struct ref_to_prune *next;
11 unsigned char sha1[20];
12 char name[FLEX_ARRAY];
13 };
14
15 struct pack_refs_cb_data {
16 int prune;
17 int all;
18 struct ref_to_prune *ref_to_prune;
19 FILE *refs_file;
20 };
21
22 static int do_not_prune(int flags)
23 {
24 /* If it is already packed or if it is a symref,
25 * do not prune it.
26 */
27 return (flags & (REF_ISSYMREF|REF_ISPACKED));
28 }
29
30 static int handle_one_ref(const char *path, const unsigned char *sha1,
31 int flags, void *cb_data)
32 {
33 struct pack_refs_cb_data *cb = cb_data;
34 int is_tag_ref;
35
36 /* Do not pack the symbolic refs */
37 if ((flags & REF_ISSYMREF))
38 return 0;
39 is_tag_ref = !strncmp(path, "refs/tags/", 10);
40 if (!cb->all && !is_tag_ref)
41 return 0;
42
43 fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
44 if (is_tag_ref) {
45 struct object *o = parse_object(sha1);
46 if (o->type == OBJ_TAG) {
47 o = deref_tag(o, path, 0);
48 if (o)
49 fprintf(cb->refs_file, "^%s\n",
50 sha1_to_hex(o->sha1));
51 }
52 }
53
54 if (cb->prune && !do_not_prune(flags)) {
55 int namelen = strlen(path) + 1;
56 struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
57 hashcpy(n->sha1, sha1);
58 strcpy(n->name, path);
59 n->next = cb->ref_to_prune;
60 cb->ref_to_prune = n;
61 }
62 return 0;
63 }
64
65 /* make sure nobody touched the ref, and unlink */
66 static void prune_ref(struct ref_to_prune *r)
67 {
68 struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
69
70 if (lock) {
71 unlink(git_path("%s", r->name));
72 unlock_ref(lock);
73 }
74 }
75
76 static void prune_refs(struct ref_to_prune *r)
77 {
78 while (r) {
79 prune_ref(r);
80 r = r->next;
81 }
82 }
83
84 static struct lock_file packed;
85
86 int cmd_pack_refs(int argc, const char **argv, const char *prefix)
87 {
88 int fd, i;
89 struct pack_refs_cb_data cbdata;
90
91 memset(&cbdata, 0, sizeof(cbdata));
92
93 for (i = 1; i < argc; i++) {
94 const char *arg = argv[i];
95 if (!strcmp(arg, "--prune")) {
96 cbdata.prune = 1;
97 continue;
98 }
99 if (!strcmp(arg, "--all")) {
100 cbdata.all = 1;
101 continue;
102 }
103 /* perhaps other parameters later... */
104 break;
105 }
106 if (i != argc)
107 usage(builtin_pack_refs_usage);
108
109 fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
110 cbdata.refs_file = fdopen(fd, "w");
111 if (!cbdata.refs_file)
112 die("unable to create ref-pack file structure (%s)",
113 strerror(errno));
114
115 /* perhaps other traits later as well */
116 fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
117
118 for_each_ref(handle_one_ref, &cbdata);
119 fflush(cbdata.refs_file);
120 fsync(fd);
121 fclose(cbdata.refs_file);
122 if (commit_lock_file(&packed) < 0)
123 die("unable to overwrite old ref-pack file (%s)", strerror(errno));
124 if (cbdata.prune)
125 prune_refs(cbdata.ref_to_prune);
126 return 0;
127 }