builtin-pack-refs.c

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