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
   7static const char builtin_pack_refs_usage[] =
   8"git-pack-refs [--all] [--prune | --no-prune]";
   9
  10struct ref_to_prune {
  11        struct ref_to_prune *next;
  12        unsigned char sha1[20];
  13        char name[FLEX_ARRAY];
  14};
  15
  16#define PACK_REFS_PRUNE 0x0001
  17#define PACK_REFS_ALL   0x0002
  18
  19struct pack_refs_cb_data {
  20        unsigned int flags;
  21        struct ref_to_prune *ref_to_prune;
  22        FILE *refs_file;
  23};
  24
  25static int do_not_prune(int flags)
  26{
  27        /* If it is already packed or if it is a symref,
  28         * do not prune it.
  29         */
  30        return (flags & (REF_ISSYMREF|REF_ISPACKED));
  31}
  32
  33static int handle_one_ref(const char *path, const unsigned char *sha1,
  34                          int flags, void *cb_data)
  35{
  36        struct pack_refs_cb_data *cb = cb_data;
  37        int is_tag_ref;
  38
  39        /* Do not pack the symbolic refs */
  40        if ((flags & REF_ISSYMREF))
  41                return 0;
  42        is_tag_ref = !prefixcmp(path, "refs/tags/");
  43
  44        /* ALWAYS pack refs that were already packed or are tags */
  45        if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref && !(flags & REF_ISPACKED))
  46                return 0;
  47
  48        fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
  49        if (is_tag_ref) {
  50                struct object *o = parse_object(sha1);
  51                if (o->type == OBJ_TAG) {
  52                        o = deref_tag(o, path, 0);
  53                        if (o)
  54                                fprintf(cb->refs_file, "^%s\n",
  55                                        sha1_to_hex(o->sha1));
  56                }
  57        }
  58
  59        if ((cb->flags & PACK_REFS_PRUNE) && !do_not_prune(flags)) {
  60                int namelen = strlen(path) + 1;
  61                struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
  62                hashcpy(n->sha1, sha1);
  63                strcpy(n->name, path);
  64                n->next = cb->ref_to_prune;
  65                cb->ref_to_prune = n;
  66        }
  67        return 0;
  68}
  69
  70/* make sure nobody touched the ref, and unlink */
  71static void prune_ref(struct ref_to_prune *r)
  72{
  73        struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
  74
  75        if (lock) {
  76                unlink(git_path("%s", r->name));
  77                unlock_ref(lock);
  78        }
  79}
  80
  81static void prune_refs(struct ref_to_prune *r)
  82{
  83        while (r) {
  84                prune_ref(r);
  85                r = r->next;
  86        }
  87}
  88
  89static struct lock_file packed;
  90
  91static int pack_refs(unsigned int flags)
  92{
  93        int fd;
  94        struct pack_refs_cb_data cbdata;
  95
  96        memset(&cbdata, 0, sizeof(cbdata));
  97        cbdata.flags = flags;
  98
  99        fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
 100        cbdata.refs_file = fdopen(fd, "w");
 101        if (!cbdata.refs_file)
 102                die("unable to create ref-pack file structure (%s)",
 103                    strerror(errno));
 104
 105        /* perhaps other traits later as well */
 106        fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
 107
 108        for_each_ref(handle_one_ref, &cbdata);
 109        if (ferror(cbdata.refs_file))
 110                die("failed to write ref-pack file");
 111        if (fflush(cbdata.refs_file) || fsync(fd) || fclose(cbdata.refs_file))
 112                die("failed to write ref-pack file (%s)", strerror(errno));
 113        if (commit_lock_file(&packed) < 0)
 114                die("unable to overwrite old ref-pack file (%s)", strerror(errno));
 115        if (cbdata.flags & PACK_REFS_PRUNE)
 116                prune_refs(cbdata.ref_to_prune);
 117        return 0;
 118}
 119
 120int cmd_pack_refs(int argc, const char **argv, const char *prefix)
 121{
 122        int i;
 123        unsigned int flags;
 124
 125        flags = PACK_REFS_PRUNE;
 126        for (i = 1; i < argc; i++) {
 127                const char *arg = argv[i];
 128                if (!strcmp(arg, "--prune")) {
 129                        flags |= PACK_REFS_PRUNE; /* now the default */
 130                        continue;
 131                }
 132                if (!strcmp(arg, "--no-prune")) {
 133                        flags &= ~PACK_REFS_PRUNE;
 134                        continue;
 135                }
 136                if (!strcmp(arg, "--all")) {
 137                        flags |= PACK_REFS_ALL;
 138                        continue;
 139                }
 140                /* perhaps other parameters later... */
 141                break;
 142        }
 143        if (i != argc)
 144                usage(builtin_pack_refs_usage);
 145
 146        return pack_refs(flags);
 147}