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

   1#include "cache.h"
   2#include "refs.h"
   3#include "object.h"
   4#include "tag.h"
   5
   6static const char builtin_pack_refs_usage[] =
   7"git-pack-refs [--all] [--prune | --no-prune]";
   8
   9struct ref_to_prune {
  10        struct ref_to_prune *next;
  11        unsigned char sha1[20];
  12        char name[FLEX_ARRAY];
  13};
  14
  15struct pack_refs_cb_data {
  16        int prune;
  17        int all;
  18        struct ref_to_prune *ref_to_prune;
  19        FILE *refs_file;
  20};
  21
  22static 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
  30static 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
  41        /* ALWAYS pack refs that were already packed or are tags */
  42        if (!cb->all && !is_tag_ref && !(flags & REF_ISPACKED))
  43                return 0;
  44
  45        fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
  46        if (is_tag_ref) {
  47                struct object *o = parse_object(sha1);
  48                if (o->type == OBJ_TAG) {
  49                        o = deref_tag(o, path, 0);
  50                        if (o)
  51                                fprintf(cb->refs_file, "^%s\n",
  52                                        sha1_to_hex(o->sha1));
  53                }
  54        }
  55
  56        if (cb->prune && !do_not_prune(flags)) {
  57                int namelen = strlen(path) + 1;
  58                struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
  59                hashcpy(n->sha1, sha1);
  60                strcpy(n->name, path);
  61                n->next = cb->ref_to_prune;
  62                cb->ref_to_prune = n;
  63        }
  64        return 0;
  65}
  66
  67/* make sure nobody touched the ref, and unlink */
  68static void prune_ref(struct ref_to_prune *r)
  69{
  70        struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
  71
  72        if (lock) {
  73                unlink(git_path("%s", r->name));
  74                unlock_ref(lock);
  75        }
  76}
  77
  78static void prune_refs(struct ref_to_prune *r)
  79{
  80        while (r) {
  81                prune_ref(r);
  82                r = r->next;
  83        }
  84}
  85
  86static struct lock_file packed;
  87
  88int cmd_pack_refs(int argc, const char **argv, const char *prefix)
  89{
  90        int fd, i;
  91        struct pack_refs_cb_data cbdata;
  92
  93        memset(&cbdata, 0, sizeof(cbdata));
  94
  95        cbdata.prune = 1;
  96        for (i = 1; i < argc; i++) {
  97                const char *arg = argv[i];
  98                if (!strcmp(arg, "--prune")) {
  99                        cbdata.prune = 1; /* now the default */
 100                        continue;
 101                }
 102                if (!strcmp(arg, "--no-prune")) {
 103                        cbdata.prune = 0;
 104                        continue;
 105                }
 106                if (!strcmp(arg, "--all")) {
 107                        cbdata.all = 1;
 108                        continue;
 109                }
 110                /* perhaps other parameters later... */
 111                break;
 112        }
 113        if (i != argc)
 114                usage(builtin_pack_refs_usage);
 115
 116        fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
 117        cbdata.refs_file = fdopen(fd, "w");
 118        if (!cbdata.refs_file)
 119                die("unable to create ref-pack file structure (%s)",
 120                    strerror(errno));
 121
 122        /* perhaps other traits later as well */
 123        fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
 124
 125        for_each_ref(handle_one_ref, &cbdata);
 126        fflush(cbdata.refs_file);
 127        fsync(fd);
 128        fclose(cbdata.refs_file);
 129        if (commit_lock_file(&packed) < 0)
 130                die("unable to overwrite old ref-pack file (%s)", strerror(errno));
 131        if (cbdata.prune)
 132                prune_refs(cbdata.ref_to_prune);
 133        return 0;
 134}