Andrew's git - gitweb.git/blob - builtin-pack-refs.c

   1#include "cache.h"
   2#include "refs.h"
   3
   4static const char builtin_pack_refs_usage[] =
   5"git-pack-refs [--all] [--prune]";
   6
   7struct ref_to_prune {
   8        struct ref_to_prune *next;
   9        unsigned char sha1[20];
  10        char name[FLEX_ARRAY];
  11};
  12
  13struct pack_refs_cb_data {
  14        int prune;
  15        int all;
  16        struct ref_to_prune *ref_to_prune;
  17        FILE *refs_file;
  18};
  19
  20static 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
  28static 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 */
  50static 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
  60static void prune_refs(struct ref_to_prune *r)
  61{
  62        while (r) {
  63                prune_ref(r);
  64                r = r->next;
  65        }
  66}
  67
  68static struct lock_file packed;
  69
  70int 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}