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

   1#include "builtin.h"
   2#include "cache.h"
   3#include "refs.h"
   4#include "object.h"
   5#include "tag.h"
   6#include "parse-options.h"
   7
   8struct ref_to_prune {
   9        struct ref_to_prune *next;
  10        unsigned char sha1[20];
  11        char name[FLEX_ARRAY];
  12};
  13
  14#define PACK_REFS_PRUNE 0x0001
  15#define PACK_REFS_ALL   0x0002
  16
  17struct pack_refs_cb_data {
  18        unsigned int flags;
  19        struct ref_to_prune *ref_to_prune;
  20        FILE *refs_file;
  21};
  22
  23static int do_not_prune(int flags)
  24{
  25        /* If it is already packed or if it is a symref,
  26         * do not prune it.
  27         */
  28        return (flags & (REF_ISSYMREF|REF_ISPACKED));
  29}
  30
  31static int handle_one_ref(const char *path, const unsigned char *sha1,
  32                          int flags, void *cb_data)
  33{
  34        struct pack_refs_cb_data *cb = cb_data;
  35        int is_tag_ref;
  36
  37        /* Do not pack the symbolic refs */
  38        if ((flags & REF_ISSYMREF))
  39                return 0;
  40        is_tag_ref = !prefixcmp(path, "refs/tags/");
  41
  42        /* ALWAYS pack refs that were already packed or are tags */
  43        if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref && !(flags & REF_ISPACKED))
  44                return 0;
  45
  46        fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
  47        if (is_tag_ref) {
  48                struct object *o = parse_object(sha1);
  49                if (o->type == OBJ_TAG) {
  50                        o = deref_tag(o, path, 0);
  51                        if (o)
  52                                fprintf(cb->refs_file, "^%s\n",
  53                                        sha1_to_hex(o->sha1));
  54                }
  55        }
  56
  57        if ((cb->flags & PACK_REFS_PRUNE) && !do_not_prune(flags)) {
  58                int namelen = strlen(path) + 1;
  59                struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
  60                hashcpy(n->sha1, sha1);
  61                strcpy(n->name, path);
  62                n->next = cb->ref_to_prune;
  63                cb->ref_to_prune = n;
  64        }
  65        return 0;
  66}
  67
  68/* make sure nobody touched the ref, and unlink */
  69static void prune_ref(struct ref_to_prune *r)
  70{
  71        struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
  72
  73        if (lock) {
  74                unlink(git_path("%s", r->name));
  75                unlock_ref(lock);
  76        }
  77}
  78
  79static void prune_refs(struct ref_to_prune *r)
  80{
  81        while (r) {
  82                prune_ref(r);
  83                r = r->next;
  84        }
  85}
  86
  87static struct lock_file packed;
  88
  89static int pack_refs(unsigned int flags)
  90{
  91        int fd;
  92        struct pack_refs_cb_data cbdata;
  93
  94        memset(&cbdata, 0, sizeof(cbdata));
  95        cbdata.flags = flags;
  96
  97        fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
  98        cbdata.refs_file = fdopen(fd, "w");
  99        if (!cbdata.refs_file)
 100                die("unable to create ref-pack file structure (%s)",
 101                    strerror(errno));
 102
 103        /* perhaps other traits later as well */
 104        fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
 105
 106        for_each_ref(handle_one_ref, &cbdata);
 107        if (ferror(cbdata.refs_file))
 108                die("failed to write ref-pack file");
 109        if (fflush(cbdata.refs_file) || fsync(fd) || fclose(cbdata.refs_file))
 110                die("failed to write ref-pack file (%s)", strerror(errno));
 111        /*
 112         * Since the lock file was fdopen()'ed and then fclose()'ed above,
 113         * assign -1 to the lock file descriptor so that commit_lock_file()
 114         * won't try to close() it.
 115         */
 116        packed.fd = -1;
 117        if (commit_lock_file(&packed) < 0)
 118                die("unable to overwrite old ref-pack file (%s)", strerror(errno));
 119        if (cbdata.flags & PACK_REFS_PRUNE)
 120                prune_refs(cbdata.ref_to_prune);
 121        return 0;
 122}
 123
 124static char const * const pack_refs_usage[] = {
 125        "git-pack-refs [options]",
 126        NULL
 127};
 128
 129int cmd_pack_refs(int argc, const char **argv, const char *prefix)
 130{
 131        unsigned int flags = PACK_REFS_PRUNE;
 132        struct option opts[] = {
 133                OPT_BIT(0, "all",   &flags, "pack everything", PACK_REFS_ALL),
 134                OPT_BIT(0, "prune", &flags, "prune loose refs (default)", PACK_REFS_PRUNE),
 135                OPT_END(),
 136        };
 137        if (parse_options(argc, argv, opts, pack_refs_usage, 0))
 138                usage_with_options(pack_refs_usage, opts);
 139        return pack_refs(flags);
 140}