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