builtin/show-ref.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4 #include "object.h"
   5 #include "tag.h"
   6 #include "string-list.h"
   7 #include "parse-options.h"
   8
   9 static const char * const show_ref_usage[] = {
  10         N_("git show-ref [-q | --quiet] [--verify] [--head] [-d | --dereference] [-s | --hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [<pattern>...]"),
  11         N_("git show-ref --exclude-existing[=pattern] < ref-list"),
  12         NULL
  13 };
  14
  15 static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
  16            quiet, hash_only, abbrev, exclude_arg;
  17 static const char **pattern;
  18 static const char *exclude_existing_arg;
  19
  20 static void show_one(const char *refname, const struct object_id *oid)
  21 {
  22         const char *hex = find_unique_abbrev(oid->hash, abbrev);
  23         if (hash_only)
  24                 printf("%s\n", hex);
  25         else
  26                 printf("%s %s\n", hex, refname);
  27 }
  28
  29 static int show_ref(const char *refname, const struct object_id *oid,
  30                     int flag, void *cbdata)
  31 {
  32         const char *hex;
  33         struct object_id peeled;
  34
  35         if (show_head && !strcmp(refname, "HEAD"))
  36                 goto match;
  37
  38         if (tags_only || heads_only) {
  39                 int match;
  40
  41                 match = heads_only && starts_with(refname, "refs/heads/");
  42                 match |= tags_only && starts_with(refname, "refs/tags/");
  43                 if (!match)
  44                         return 0;
  45         }
  46         if (pattern) {
  47                 int reflen = strlen(refname);
  48                 const char **p = pattern, *m;
  49                 while ((m = *p++) != NULL) {
  50                         int len = strlen(m);
  51                         if (len > reflen)
  52                                 continue;
  53                         if (memcmp(m, refname + reflen - len, len))
  54                                 continue;
  55                         if (len == reflen)
  56                                 goto match;
  57                         /* "--verify" requires an exact match */
  58                         if (verify)
  59                                 continue;
  60                         if (refname[reflen - len - 1] == '/')
  61                                 goto match;
  62                 }
  63                 return 0;
  64         }
  65
  66 match:
  67         found_match++;
  68
  69         /* This changes the semantics slightly that even under quiet we
  70          * detect and return error if the repository is corrupt and
  71          * ref points at a nonexistent object.
  72          */
  73         if (!has_sha1_file(oid->hash))
  74                 die("git show-ref: bad ref %s (%s)", refname,
  75                     oid_to_hex(oid));
  76
  77         if (quiet)
  78                 return 0;
  79
  80         show_one(refname, oid);
  81
  82         if (!deref_tags)
  83                 return 0;
  84
  85         if (!peel_ref(refname, peeled.hash)) {
  86                 hex = find_unique_abbrev(peeled.hash, abbrev);
  87                 printf("%s %s^{}\n", hex, refname);
  88         }
  89         return 0;
  90 }
  91
  92 static int add_existing(const char *refname, const struct object_id *oid,
  93                         int flag, void *cbdata)
  94 {
  95         struct string_list *list = (struct string_list *)cbdata;
  96         string_list_insert(list, refname);
  97         return 0;
  98 }
  99
 100 /*
 101  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 102  * and
 103  * (1) strip "^{}" at the end of line if any;
 104  * (2) ignore if match is provided and does not head-match refname;
 105  * (3) warn if refname is not a well-formed refname and skip;
 106  * (4) ignore if refname is a ref that exists in the local repository;
 107  * (5) otherwise output the line.
 108  */
 109 static int exclude_existing(const char *match)
 110 {
 111         static struct string_list existing_refs = STRING_LIST_INIT_DUP;
 112         char buf[1024];
 113         int matchlen = match ? strlen(match) : 0;
 114
 115         for_each_ref(add_existing, &existing_refs);
 116         while (fgets(buf, sizeof(buf), stdin)) {
 117                 char *ref;
 118                 int len = strlen(buf);
 119
 120                 if (len > 0 && buf[len - 1] == '\n')
 121                         buf[--len] = '\0';
 122                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 123                         len -= 3;
 124                         buf[len] = '\0';
 125                 }
 126                 for (ref = buf + len; buf < ref; ref--)
 127                         if (isspace(ref[-1]))
 128                                 break;
 129                 if (match) {
 130                         int reflen = buf + len - ref;
 131                         if (reflen < matchlen)
 132                                 continue;
 133                         if (strncmp(ref, match, matchlen))
 134                                 continue;
 135                 }
 136                 if (check_refname_format(ref, 0)) {
 137                         warning("ref '%s' ignored", ref);
 138                         continue;
 139                 }
 140                 if (!string_list_has_string(&existing_refs, ref)) {
 141                         printf("%s\n", buf);
 142                 }
 143         }
 144         return 0;
 145 }
 146
 147 static int hash_callback(const struct option *opt, const char *arg, int unset)
 148 {
 149         hash_only = 1;
 150         /* Use full length SHA1 if no argument */
 151         if (!arg)
 152                 return 0;
 153         return parse_opt_abbrev_cb(opt, arg, unset);
 154 }
 155
 156 static int exclude_existing_callback(const struct option *opt, const char *arg,
 157                                      int unset)
 158 {
 159         exclude_arg = 1;
 160         *(const char **)opt->value = arg;
 161         return 0;
 162 }
 163
 164 static int help_callback(const struct option *opt, const char *arg, int unset)
 165 {
 166         return -1;
 167 }
 168
 169 static const struct option show_ref_options[] = {
 170         OPT_BOOL(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
 171         OPT_BOOL(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
 172         OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
 173                     "requires exact ref path")),
 174         OPT_HIDDEN_BOOL('h', NULL, &show_head,
 175                         N_("show the HEAD reference, even if it would be filtered out")),
 176         OPT_BOOL(0, "head", &show_head,
 177           N_("show the HEAD reference, even if it would be filtered out")),
 178         OPT_BOOL('d', "dereference", &deref_tags,
 179                     N_("dereference tags into object IDs")),
 180         { OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"),
 181           N_("only show SHA1 hash using <n> digits"),
 182           PARSE_OPT_OPTARG, &hash_callback },
 183         OPT__ABBREV(&abbrev),
 184         OPT__QUIET(&quiet,
 185                    N_("do not print results to stdout (useful with --verify)")),
 186         { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
 187           N_("pattern"), N_("show refs from stdin that aren't in local repository"),
 188           PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
 189         { OPTION_CALLBACK, 0, "help-all", NULL, NULL, N_("show usage"),
 190           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 191         OPT_END()
 192 };
 193
 194 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 195 {
 196         if (argc == 2 && !strcmp(argv[1], "-h"))
 197                 usage_with_options(show_ref_usage, show_ref_options);
 198
 199         argc = parse_options(argc, argv, prefix, show_ref_options,
 200                              show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);
 201
 202         if (exclude_arg)
 203                 return exclude_existing(exclude_existing_arg);
 204
 205         pattern = argv;
 206         if (!*pattern)
 207                 pattern = NULL;
 208
 209         if (verify) {
 210                 if (!pattern)
 211                         die("--verify requires a reference");
 212                 while (*pattern) {
 213                         struct object_id oid;
 214
 215                         if (starts_with(*pattern, "refs/") &&
 216                             !read_ref(*pattern, oid.hash)) {
 217                                 if (!quiet)
 218                                         show_one(*pattern, &oid);
 219                         }
 220                         else if (!quiet)
 221                                 die("'%s' - not a valid ref", *pattern);
 222                         else
 223                                 return 1;
 224                         pattern++;
 225                 }
 226                 return 0;
 227         }
 228
 229         if (show_head)
 230                 head_ref(show_ref, NULL);
 231         for_each_ref(show_ref, NULL);
 232         if (!found_match) {
 233                 if (verify && !quiet)
 234                         die("No match");
 235                 return 1;
 236         }
 237         return 0;
 238 }