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