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
  15#define PACK_REFS_PRUNE 0x0001
  16#define PACK_REFS_ALL   0x0002
  17
  18struct pack_refs_cb_data {
  19        unsigned int flags;
  20        struct ref_to_prune *ref_to_prune;
  21        FILE *refs_file;
  22};
  23
  24static int do_not_prune(int flags)
  25{
  26        /* If it is already packed or if it is a symref,
  27         * do not prune it.
  28         */
  29        return (flags & (REF_ISSYMREF|REF_ISPACKED));
  30}
  31
  32static int handle_one_ref(const char *path, const unsigned char *sha1,
  33                          int flags, void *cb_data)
  34{
  35        struct pack_refs_cb_data *cb = cb_data;
  36        int is_tag_ref;
  37
  38        /* Do not pack the symbolic refs */
  39        if ((flags & REF_ISSYMREF))
  40                return 0;
  41        is_tag_ref = !prefixcmp(path, "refs/tags/");
  42
  43        /* ALWAYS pack refs that were already packed or are tags */
  44        if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref && !(flags & REF_ISPACKED))
  45                return 0;
  46
  47        fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
  48        if (is_tag_ref) {
  49                struct object *o = parse_object(sha1);
  50                if (o->type == OBJ_TAG) {
  51                        o = deref_tag(o, path, 0);
  52                        if (o)
  53                                fprintf(cb->refs_file, "^%s\n",
  54                                        sha1_to_hex(o->sha1));
  55                }
  56        }
  57
  58        if ((cb->flags & PACK_REFS_PRUNE) && !do_not_prune(flags)) {
  59                int namelen = strlen(path) + 1;
  60                struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
  61                hashcpy(n->sha1, sha1);
  62                strcpy(n->name, path);
  63                n->next = cb->ref_to_prune;
  64                cb->ref_to_prune = n;
  65        }
  66        return 0;
  67}
  68
  69/* make sure nobody touched the ref, and unlink */
  70static void prune_ref(struct ref_to_prune *r)
  71{
  72        struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
  73
  74        if (lock) {
  75                unlink(git_path("%s", r->name));
  76                unlock_ref(lock);
  77        }
  78}
  79
  80static void prune_refs(struct ref_to_prune *r)
  81{
  82        while (r) {
  83                prune_ref(r);
  84                r = r->next;
  85        }
  86}
  87
  88static struct lock_file packed;
  89
  90static int pack_refs(unsigned int flags)
  91{
  92        int fd;
  93        struct pack_refs_cb_data cbdata;
  94
  95        memset(&cbdata, 0, sizeof(cbdata));
  96        cbdata.flags = flags;
  97
  98        fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
  99        cbdata.refs_file = fdopen(fd, "w");
 100        if (!cbdata.refs_file)
 101                die("unable to create ref-pack file structure (%s)",
 102                    strerror(errno));
 103
 104        /* perhaps other traits later as well */
 105        fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
 106
 107        for_each_ref(handle_one_ref, &cbdata);
 108        if (ferror(cbdata.refs_file))
 109                die("failed to write ref-pack file");
 110        if (fflush(cbdata.refs_file) || fsync(fd) || fclose(cbdata.refs_file))
 111                die("failed to write ref-pack file (%s)", strerror(errno));
 112        if (commit_lock_file(&packed) < 0)
 113                die("unable to overwrite old ref-pack file (%s)", strerror(errno));
 114        if (cbdata.flags & PACK_REFS_PRUNE)
 115                prune_refs(cbdata.ref_to_prune);
 116        return 0;
 117}
 118
 119int cmd_pack_refs(int argc, const char **argv, const char *prefix)
 120{
 121        int i;
 122        unsigned int flags;
 123
 124        flags = PACK_REFS_PRUNE;
 125        for (i = 1; i < argc; i++) {
 126                const char *arg = argv[i];
 127                if (!strcmp(arg, "--prune")) {
 128                        flags |= PACK_REFS_PRUNE; /* now the default */
 129                        continue;
 130                }
 131                if (!strcmp(arg, "--no-prune")) {
 132                        flags &= ~PACK_REFS_PRUNE;
 133                        continue;
 134                }
 135                if (!strcmp(arg, "--all")) {
 136                        flags |= PACK_REFS_ALL;
 137                        continue;
 138                }
 139                /* perhaps other parameters later... */
 140                break;
 141        }
 142        if (i != argc)
 143                usage(builtin_pack_refs_usage);
 144
 145        return pack_refs(flags);
 146}