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