builtin-show-ref.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "object.h"
   4 #include "tag.h"
   5
   6 static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*]";
   7
   8 static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
   9         found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
  10 static const char **pattern;
  11
  12 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  13 {
  14         struct object *obj;
  15         const char *hex;
  16         unsigned char peeled[20];
  17
  18         if (tags_only || heads_only) {
  19                 int match;
  20
  21                 match = heads_only && !strncmp(refname, "refs/heads/", 11);
  22                 match |= tags_only && !strncmp(refname, "refs/tags/", 10);
  23                 if (!match)
  24                         return 0;
  25         }
  26         if (pattern) {
  27                 int reflen = strlen(refname);
  28                 const char **p = pattern, *m;
  29                 while ((m = *p++) != NULL) {
  30                         int len = strlen(m);
  31                         if (len > reflen)
  32                                 continue;
  33                         if (memcmp(m, refname + reflen - len, len))
  34                                 continue;
  35                         if (len == reflen)
  36                                 goto match;
  37                         /* "--verify" requires an exact match */
  38                         if (verify)
  39                                 continue;
  40                         if (refname[reflen - len - 1] == '/')
  41                                 goto match;
  42                 }
  43                 return 0;
  44         }
  45
  46 match:
  47         found_match++;
  48
  49         /* This changes the semantics slightly that even under quiet we
  50          * detect and return error if the repository is corrupt and
  51          * ref points at a nonexistent object.
  52          */
  53         if (!has_sha1_file(sha1))
  54                 die("git-show-ref: bad ref %s (%s)", refname,
  55                     sha1_to_hex(sha1));
  56
  57         if (quiet)
  58                 return 0;
  59
  60         hex = find_unique_abbrev(sha1, abbrev);
  61         if (hash_only)
  62                 printf("%s\n", hex);
  63         else
  64                 printf("%s %s\n", hex, refname);
  65
  66         if (!deref_tags)
  67                 return 0;
  68
  69         if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
  70                 if (!is_null_sha1(peeled)) {
  71                         hex = find_unique_abbrev(peeled, abbrev);
  72                         printf("%s %s^{}\n", hex, refname);
  73                 }
  74         }
  75         else {
  76                 obj = parse_object(sha1);
  77                 if (!obj)
  78                         die("git-show-ref: bad ref %s (%s)", refname,
  79                             sha1_to_hex(sha1));
  80                 if (obj->type == OBJ_TAG) {
  81                         obj = deref_tag(obj, refname, 0);
  82                         hex = find_unique_abbrev(obj->sha1, abbrev);
  83                         printf("%s %s^{}\n", hex, refname);
  84                 }
  85         }
  86         return 0;
  87 }
  88
  89 int cmd_show_ref(int argc, const char **argv, const char *prefix)
  90 {
  91         int i;
  92
  93         for (i = 1; i < argc; i++) {
  94                 const char *arg = argv[i];
  95                 if (*arg != '-') {
  96                         pattern = argv + i;
  97                         break;
  98                 }
  99                 if (!strcmp(arg, "--")) {
 100                         pattern = argv + i + 1;
 101                         if (!*pattern)
 102                                 pattern = NULL;
 103                         break;
 104                 }
 105                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 106                         quiet = 1;
 107                         continue;
 108                 }
 109                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 110                         show_head = 1;
 111                         continue;
 112                 }
 113                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 114                         deref_tags = 1;
 115                         continue;
 116                 }
 117                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 118                         hash_only = 1;
 119                         continue;
 120                 }
 121                 if (!strncmp(arg, "--hash=", 7) ||
 122                     (!strncmp(arg, "--abbrev", 8) &&
 123                      (arg[8] == '=' || arg[8] == '\0'))) {
 124                         if (arg[3] != 'h' && !arg[8])
 125                                 /* --abbrev only */
 126                                 abbrev = DEFAULT_ABBREV;
 127                         else {
 128                                 /* --hash= or --abbrev= */
 129                                 char *end;
 130                                 if (arg[3] == 'h') {
 131                                         hash_only = 1;
 132                                         arg += 7;
 133                                 }
 134                                 else
 135                                         arg += 9;
 136                                 abbrev = strtoul(arg, &end, 10);
 137                                 if (*end || abbrev > 40)
 138                                         usage(show_ref_usage);
 139                                 if (abbrev < MINIMUM_ABBREV)
 140                                         abbrev = MINIMUM_ABBREV;
 141                         }
 142                         continue;
 143                 }
 144                 if (!strcmp(arg, "--verify")) {
 145                         verify = 1;
 146                         continue;
 147                 }
 148                 if (!strcmp(arg, "--tags")) {
 149                         tags_only = 1;
 150                         continue;
 151                 }
 152                 if (!strcmp(arg, "--heads")) {
 153                         heads_only = 1;
 154                         continue;
 155                 }
 156                 usage(show_ref_usage);
 157         }
 158         if (show_head)
 159                 head_ref(show_ref, NULL);
 160         for_each_ref(show_ref, NULL);
 161         if (!found_match) {
 162                 if (verify && !quiet)
 163                         die("No match");
 164                 return 1;
 165         }
 166         return 0;
 167 }