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 [--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        struct ref_to_prune *ref_to_prune;
  16        FILE *refs_file;
  17};
  18
  19static int do_not_prune(int flags)
  20{
  21        /* If it is already packed or if it is a symref,
  22         * do not prune it.
  23         */
  24        return (flags & (REF_ISSYMREF|REF_ISPACKED));
  25}
  26
  27static int handle_one_ref(const char *path, const unsigned char *sha1,
  28                          int flags, void *cb_data)
  29{
  30        struct pack_refs_cb_data *cb = cb_data;
  31
  32        /* Do not pack the symbolic refs */
  33        if (!(flags & REF_ISSYMREF))
  34                fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
  35        if (cb->prune && !do_not_prune(flags)) {
  36                int namelen = strlen(path) + 1;
  37                struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
  38                hashcpy(n->sha1, sha1);
  39                strcpy(n->name, path);
  40                n->next = cb->ref_to_prune;
  41                cb->ref_to_prune = n;
  42        }
  43        return 0;
  44}
  45
  46/* make sure nobody touched the ref, and unlink */
  47static void prune_ref(struct ref_to_prune *r)
  48{
  49        struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
  50
  51        if (lock) {
  52                unlink(git_path("%s", r->name));
  53                unlock_ref(lock);
  54        }
  55}
  56
  57static void prune_refs(struct ref_to_prune *r)
  58{
  59        while (r) {
  60                prune_ref(r);
  61                r = r->next;
  62        }
  63}
  64
  65static struct lock_file packed;
  66
  67int cmd_pack_refs(int argc, const char **argv, const char *prefix)
  68{
  69        int fd, i;
  70        struct pack_refs_cb_data cbdata;
  71
  72        memset(&cbdata, 0, sizeof(cbdata));
  73
  74        for (i = 1; i < argc; i++) {
  75                const char *arg = argv[i];
  76                if (!strcmp(arg, "--prune")) {
  77                        cbdata.prune = 1;
  78                        continue;
  79                }
  80                /* perhaps other parameters later... */
  81                break;
  82        }
  83        if (i != argc)
  84                usage(builtin_pack_refs_usage);
  85
  86        fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
  87        cbdata.refs_file = fdopen(fd, "w");
  88        if (!cbdata.refs_file)
  89                die("unable to create ref-pack file structure (%s)",
  90                    strerror(errno));
  91        for_each_ref(handle_one_ref, &cbdata);
  92        fsync(fd);
  93        fclose(cbdata.refs_file);
  94        if (commit_lock_file(&packed) < 0)
  95                die("unable to overwrite old ref-pack file (%s)", strerror(errno));
  96        if (cbdata.prune)
  97                prune_refs(cbdata.ref_to_prune);
  98        return 0;
  99}