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 unsigned char *sha1)
  21 {
  22         const char *hex = find_unique_abbrev(sha1, 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 unsigned char *sha1, int flag, void *cbdata)
  30 {
  31         const char *hex;
  32         unsigned char peeled[20];
  33
  34         if (show_head && !strcmp(refname, "HEAD"))
  35                 goto match;
  36
  37         if (tags_only || heads_only) {
  38                 int match;
  39
  40                 match = heads_only && !prefixcmp(refname, "refs/heads/");
  41                 match |= tags_only && !prefixcmp(refname, "refs/tags/");
  42                 if (!match)
  43                         return 0;
  44         }
  45         if (pattern) {
  46                 int reflen = strlen(refname);
  47                 const char **p = pattern, *m;
  48                 while ((m = *p++) != NULL) {
  49                         int len = strlen(m);
  50                         if (len > reflen)
  51                                 continue;
  52                         if (memcmp(m, refname + reflen - len, len))
  53                                 continue;
  54                         if (len == reflen)
  55                                 goto match;
  56                         /* "--verify" requires an exact match */
  57                         if (verify)
  58                                 continue;
  59                         if (refname[reflen - len - 1] == '/')
  60                                 goto match;
  61                 }
  62                 return 0;
  63         }
  64
  65 match:
  66         found_match++;
  67
  68         /* This changes the semantics slightly that even under quiet we
  69          * detect and return error if the repository is corrupt and
  70          * ref points at a nonexistent object.
  71          */
  72         if (!has_sha1_file(sha1))
  73                 die("git show-ref: bad ref %s (%s)", refname,
  74                     sha1_to_hex(sha1));
  75
  76         if (quiet)
  77                 return 0;
  78
  79         show_one(refname, sha1);
  80
  81         if (!deref_tags)
  82                 return 0;
  83
  84         if (!peel_ref(refname, peeled)) {
  85                 hex = find_unique_abbrev(peeled, abbrev);
  86                 printf("%s %s^{}\n", hex, refname);
  87         }
  88         return 0;
  89 }
  90
  91 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  92 {
  93         struct string_list *list = (struct string_list *)cbdata;
  94         string_list_insert(list, refname);
  95         return 0;
  96 }
  97
  98 /*
  99  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 100  * and
 101  * (1) strip "^{}" at the end of line if any;
 102  * (2) ignore if match is provided and does not head-match refname;
 103  * (3) warn if refname is not a well-formed refname and skip;
 104  * (4) ignore if refname is a ref that exists in the local repository;
 105  * (5) otherwise output the line.
 106  */
 107 static int exclude_existing(const char *match)
 108 {
 109         static struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 110         char buf[1024];
 111         int matchlen = match ? strlen(match) : 0;
 112
 113         for_each_ref(add_existing, &existing_refs);
 114         while (fgets(buf, sizeof(buf), stdin)) {
 115                 char *ref;
 116                 int len = strlen(buf);
 117
 118                 if (len > 0 && buf[len - 1] == '\n')
 119                         buf[--len] = '\0';
 120                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 121                         len -= 3;
 122                         buf[len] = '\0';
 123                 }
 124                 for (ref = buf + len; buf < ref; ref--)
 125                         if (isspace(ref[-1]))
 126                                 break;
 127                 if (match) {
 128                         int reflen = buf + len - ref;
 129                         if (reflen < matchlen)
 130                                 continue;
 131                         if (strncmp(ref, match, matchlen))
 132                                 continue;
 133                 }
 134                 if (check_refname_format(ref, 0)) {
 135                         warning("ref '%s' ignored", ref);
 136                         continue;
 137                 }
 138                 if (!string_list_has_string(&existing_refs, ref)) {
 139                         printf("%s\n", buf);
 140                 }
 141         }
 142         return 0;
 143 }
 144
 145 static int hash_callback(const struct option *opt, const char *arg, int unset)
 146 {
 147         hash_only = 1;
 148         /* Use full length SHA1 if no argument */
 149         if (!arg)
 150                 return 0;
 151         return parse_opt_abbrev_cb(opt, arg, unset);
 152 }
 153
 154 static int exclude_existing_callback(const struct option *opt, const char *arg,
 155                                      int unset)
 156 {
 157         exclude_arg = 1;
 158         *(const char **)opt->value = arg;
 159         return 0;
 160 }
 161
 162 static int help_callback(const struct option *opt, const char *arg, int unset)
 163 {
 164         return -1;
 165 }
 166
 167 static const struct option show_ref_options[] = {
 168         OPT_BOOLEAN(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
 169         OPT_BOOLEAN(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
 170         OPT_BOOLEAN(0, "verify", &verify, N_("stricter reference checking, "
 171                     "requires exact ref path")),
 172         { OPTION_BOOLEAN, 'h', NULL, &show_head, NULL,
 173           N_("show the HEAD reference, even if it would be filtered out"),
 174           PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 175         OPT_BOOLEAN(0, "head", &show_head,
 176           N_("show the HEAD reference, even if it would be filtered out")),
 177         OPT_BOOLEAN('d', "dereference", &deref_tags,
 178                     N_("dereference tags into object IDs")),
 179         { OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"),
 180           N_("only show SHA1 hash using <n> digits"),
 181           PARSE_OPT_OPTARG, &hash_callback },
 182         OPT__ABBREV(&abbrev),
 183         OPT__QUIET(&quiet,
 184                    N_("do not print results to stdout (useful with --verify)")),
 185         { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
 186           N_("pattern"), N_("show refs from stdin that aren't in local repository"),
 187           PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
 188         { OPTION_CALLBACK, 0, "help-all", NULL, NULL, N_("show usage"),
 189           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 190         OPT_END()
 191 };
 192
 193 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 194 {
 195         if (argc == 2 && !strcmp(argv[1], "-h"))
 196                 usage_with_options(show_ref_usage, show_ref_options);
 197
 198         argc = parse_options(argc, argv, prefix, show_ref_options,
 199                              show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);
 200
 201         if (exclude_arg)
 202                 return exclude_existing(exclude_existing_arg);
 203
 204         pattern = argv;
 205         if (!*pattern)
 206                 pattern = NULL;
 207
 208         if (verify) {
 209                 if (!pattern)
 210                         die("--verify requires a reference");
 211                 while (*pattern) {
 212                         unsigned char sha1[20];
 213
 214                         if (!prefixcmp(*pattern, "refs/") &&
 215                             !read_ref(*pattern, sha1)) {
 216                                 if (!quiet)
 217                                         show_one(*pattern, sha1);
 218                         }
 219                         else if (!quiet)
 220                                 die("'%s' - not a valid ref", *pattern);
 221                         else
 222                                 return 1;
 223                         pattern++;
 224                 }
 225                 return 0;
 226         }
 227
 228         if (show_head)
 229                 head_ref(show_ref, NULL);
 230         for_each_ref(show_ref, NULL);
 231         if (!found_match) {
 232                 if (verify && !quiet)
 233                         die("No match");
 234                 return 1;
 235         }
 236         return 0;
 237 }