packv4: nth_packed_object_sha1() packv4 support
[git/packv4.git] / builtin-pack-refs.c
blob09df4e11a8bb89cded9be4af06bb162b7a92bd4c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4 #include "object.h"
5 #include "tag.h"
7 static const char builtin_pack_refs_usage[] =
8 "git-pack-refs [--all] [--prune | --no-prune]";
10 struct ref_to_prune {
11 struct ref_to_prune *next;
12 unsigned char sha1[20];
13 char name[FLEX_ARRAY];
16 #define PACK_REFS_PRUNE 0x0001
17 #define PACK_REFS_ALL 0x0002
19 struct pack_refs_cb_data {
20 unsigned int flags;
21 struct ref_to_prune *ref_to_prune;
22 FILE *refs_file;
25 static int do_not_prune(int flags)
27 /* If it is already packed or if it is a symref,
28 * do not prune it.
30 return (flags & (REF_ISSYMREF|REF_ISPACKED));
33 static int handle_one_ref(const char *path, const unsigned char *sha1,
34 int flags, void *cb_data)
36 struct pack_refs_cb_data *cb = cb_data;
37 int is_tag_ref;
39 /* Do not pack the symbolic refs */
40 if ((flags & REF_ISSYMREF))
41 return 0;
42 is_tag_ref = !prefixcmp(path, "refs/tags/");
44 /* ALWAYS pack refs that were already packed or are tags */
45 if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref && !(flags & REF_ISPACKED))
46 return 0;
48 fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
49 if (is_tag_ref) {
50 struct object *o = parse_object(sha1);
51 if (o->type == OBJ_TAG) {
52 o = deref_tag(o, path, 0);
53 if (o)
54 fprintf(cb->refs_file, "^%s\n",
55 sha1_to_hex(o->sha1));
59 if ((cb->flags & PACK_REFS_PRUNE) && !do_not_prune(flags)) {
60 int namelen = strlen(path) + 1;
61 struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
62 hashcpy(n->sha1, sha1);
63 strcpy(n->name, path);
64 n->next = cb->ref_to_prune;
65 cb->ref_to_prune = n;
67 return 0;
70 /* make sure nobody touched the ref, and unlink */
71 static void prune_ref(struct ref_to_prune *r)
73 struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
75 if (lock) {
76 unlink(git_path("%s", r->name));
77 unlock_ref(lock);
81 static void prune_refs(struct ref_to_prune *r)
83 while (r) {
84 prune_ref(r);
85 r = r->next;
89 static struct lock_file packed;
91 static int pack_refs(unsigned int flags)
93 int fd;
94 struct pack_refs_cb_data cbdata;
96 memset(&cbdata, 0, sizeof(cbdata));
97 cbdata.flags = flags;
99 fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
100 cbdata.refs_file = fdopen(fd, "w");
101 if (!cbdata.refs_file)
102 die("unable to create ref-pack file structure (%s)",
103 strerror(errno));
105 /* perhaps other traits later as well */
106 fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
108 for_each_ref(handle_one_ref, &cbdata);
109 if (ferror(cbdata.refs_file))
110 die("failed to write ref-pack file");
111 if (fflush(cbdata.refs_file) || fsync(fd) || fclose(cbdata.refs_file))
112 die("failed to write ref-pack file (%s)", strerror(errno));
113 if (commit_lock_file(&packed) < 0)
114 die("unable to overwrite old ref-pack file (%s)", strerror(errno));
115 if (cbdata.flags & PACK_REFS_PRUNE)
116 prune_refs(cbdata.ref_to_prune);
117 return 0;
120 int cmd_pack_refs(int argc, const char **argv, const char *prefix)
122 int i;
123 unsigned int flags;
125 flags = PACK_REFS_PRUNE;
126 for (i = 1; i < argc; i++) {
127 const char *arg = argv[i];
128 if (!strcmp(arg, "--prune")) {
129 flags |= PACK_REFS_PRUNE; /* now the default */
130 continue;
132 if (!strcmp(arg, "--no-prune")) {
133 flags &= ~PACK_REFS_PRUNE;
134 continue;
136 if (!strcmp(arg, "--all")) {
137 flags |= PACK_REFS_ALL;
138 continue;
140 /* perhaps other parameters later... */
141 break;
143 if (i != argc)
144 usage(builtin_pack_refs_usage);
146 return pack_refs(flags);