Andrew's git - gitweb.git/blob

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