builtin/show-ref.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "gettext.h"
   4 #include "hex.h"
   5 #include "refs/refs-internal.h"
   6 #include "object-name.h"
   7 #include "object-store-ll.h"
   8 #include "object.h"
   9 #include "tag.h"
  10 #include "string-list.h"
  11 #include "parse-options.h"
  12
  13 static const char * const show_ref_usage[] = {
  14         N_("git show-ref [--head] [-d | --dereference]\n"
  15            "             [-s | --hash[=<n>]] [--abbrev[=<n>]] [--tags]\n"
  16            "             [--heads] [--] [<pattern>...]"),
  17         N_("git show-ref --verify [-q | --quiet] [-d | --dereference]\n"
  18            "             [-s | --hash[=<n>]] [--abbrev[=<n>]]\n"
  19            "             [--] [<ref>...]"),
  20         N_("git show-ref --exclude-existing[=<pattern>]"),
  21         N_("git show-ref --exists <ref>"),
  22         NULL
  23 };
  24
  25 struct show_one_options {
  26         int quiet;
  27         int hash_only;
  28         int abbrev;
  29         int deref_tags;
  30 };
  31
  32 static void show_one(const struct show_one_options *opts,
  33                      const char *refname, const struct object_id *oid)
  34 {
  35         const char *hex;
  36         struct object_id peeled;
  37
  38         if (!repo_has_object_file(the_repository, oid))
  39                 die("git show-ref: bad ref %s (%s)", refname,
  40                     oid_to_hex(oid));
  41
  42         if (opts->quiet)
  43                 return;
  44
  45         hex = repo_find_unique_abbrev(the_repository, oid, opts->abbrev);
  46         if (opts->hash_only)
  47                 printf("%s\n", hex);
  48         else
  49                 printf("%s %s\n", hex, refname);
  50
  51         if (!opts->deref_tags)
  52                 return;
  53
  54         if (!peel_iterated_oid(oid, &peeled)) {
  55                 hex = repo_find_unique_abbrev(the_repository, &peeled, opts->abbrev);
  56                 printf("%s %s^{}\n", hex, refname);
  57         }
  58 }
  59
  60 struct show_ref_data {
  61         const struct show_one_options *show_one_opts;
  62         const char **patterns;
  63         int found_match;
  64         int show_head;
  65 };
  66
  67 static int show_ref(const char *refname, const struct object_id *oid,
  68                     int flag UNUSED, void *cbdata)
  69 {
  70         struct show_ref_data *data = cbdata;
  71
  72         if (data->show_head && !strcmp(refname, "HEAD"))
  73                 goto match;
  74
  75         if (data->patterns) {
  76                 int reflen = strlen(refname);
  77                 const char **p = data->patterns, *m;
  78                 while ((m = *p++) != NULL) {
  79                         int len = strlen(m);
  80                         if (len > reflen)
  81                                 continue;
  82                         if (memcmp(m, refname + reflen - len, len))
  83                                 continue;
  84                         if (len == reflen)
  85                                 goto match;
  86                         if (refname[reflen - len - 1] == '/')
  87                                 goto match;
  88                 }
  89                 return 0;
  90         }
  91
  92 match:
  93         data->found_match++;
  94
  95         show_one(data->show_one_opts, refname, oid);
  96
  97         return 0;
  98 }
  99
 100 static int add_existing(const char *refname,
 101                         const struct object_id *oid UNUSED,
 102                         int flag UNUSED, void *cbdata)
 103 {
 104         struct string_list *list = (struct string_list *)cbdata;
 105         string_list_insert(list, refname);
 106         return 0;
 107 }
 108
 109 struct exclude_existing_options {
 110         /*
 111          * We need an explicit `enabled` field because it is perfectly valid
 112          * for `pattern` to be `NULL` even if `--exclude-existing` was given.
 113          */
 114         int enabled;
 115         const char *pattern;
 116 };
 117
 118 /*
 119  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 120  * and
 121  * (1) strip "^{}" at the end of line if any;
 122  * (2) ignore if match is provided and does not head-match refname;
 123  * (3) warn if refname is not a well-formed refname and skip;
 124  * (4) ignore if refname is a ref that exists in the local repository;
 125  * (5) otherwise output the line.
 126  */
 127 static int cmd_show_ref__exclude_existing(const struct exclude_existing_options *opts)
 128 {
 129         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 130         char buf[1024];
 131         int patternlen = opts->pattern ? strlen(opts->pattern) : 0;
 132
 133         for_each_ref(add_existing, &existing_refs);
 134         while (fgets(buf, sizeof(buf), stdin)) {
 135                 char *ref;
 136                 int len = strlen(buf);
 137
 138                 if (len > 0 && buf[len - 1] == '\n')
 139                         buf[--len] = '\0';
 140                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 141                         len -= 3;
 142                         buf[len] = '\0';
 143                 }
 144                 for (ref = buf + len; buf < ref; ref--)
 145                         if (isspace(ref[-1]))
 146                                 break;
 147                 if (opts->pattern) {
 148                         int reflen = buf + len - ref;
 149                         if (reflen < patternlen)
 150                                 continue;
 151                         if (strncmp(ref, opts->pattern, patternlen))
 152                                 continue;
 153                 }
 154                 if (check_refname_format(ref, 0)) {
 155                         warning("ref '%s' ignored", ref);
 156                         continue;
 157                 }
 158                 if (!string_list_has_string(&existing_refs, ref)) {
 159                         printf("%s\n", buf);
 160                 }
 161         }
 162
 163         string_list_clear(&existing_refs, 0);
 164         return 0;
 165 }
 166
 167 static int cmd_show_ref__verify(const struct show_one_options *show_one_opts,
 168                                 const char **refs)
 169 {
 170         if (!refs || !*refs)
 171                 die("--verify requires a reference");
 172
 173         while (*refs) {
 174                 struct object_id oid;
 175
 176                 if ((starts_with(*refs, "refs/") || !strcmp(*refs, "HEAD")) &&
 177                     !read_ref(*refs, &oid)) {
 178                         show_one(show_one_opts, *refs, &oid);
 179                 }
 180                 else if (!show_one_opts->quiet)
 181                         die("'%s' - not a valid ref", *refs);
 182                 else
 183                         return 1;
 184                 refs++;
 185         }
 186
 187         return 0;
 188 }
 189
 190 struct patterns_options {
 191         int show_head;
 192         int heads_only;
 193         int tags_only;
 194 };
 195
 196 static int cmd_show_ref__patterns(const struct patterns_options *opts,
 197                                   const struct show_one_options *show_one_opts,
 198                                   const char **patterns)
 199 {
 200         struct show_ref_data show_ref_data = {
 201                 .show_one_opts = show_one_opts,
 202                 .show_head = opts->show_head,
 203         };
 204
 205         if (patterns && *patterns)
 206                 show_ref_data.patterns = patterns;
 207
 208         if (opts->show_head)
 209                 head_ref(show_ref, &show_ref_data);
 210         if (opts->heads_only || opts->tags_only) {
 211                 if (opts->heads_only)
 212                         for_each_fullref_in("refs/heads/", show_ref, &show_ref_data);
 213                 if (opts->tags_only)
 214                         for_each_fullref_in("refs/tags/", show_ref, &show_ref_data);
 215         } else {
 216                 for_each_ref(show_ref, &show_ref_data);
 217         }
 218         if (!show_ref_data.found_match)
 219                 return 1;
 220
 221         return 0;
 222 }
 223
 224 static int cmd_show_ref__exists(const char **refs)
 225 {
 226         struct strbuf unused_referent = STRBUF_INIT;
 227         struct object_id unused_oid;
 228         unsigned int unused_type;
 229         int failure_errno = 0;
 230         const char *ref;
 231         int ret = 0;
 232
 233         if (!refs || !*refs)
 234                 die("--exists requires a reference");
 235         ref = *refs++;
 236         if (*refs)
 237                 die("--exists requires exactly one reference");
 238
 239         if (refs_read_raw_ref(get_main_ref_store(the_repository), ref,
 240                               &unused_oid, &unused_referent, &unused_type,
 241                               &failure_errno)) {
 242                 if (failure_errno == ENOENT) {
 243                         error(_("reference does not exist"));
 244                         ret = 2;
 245                 } else {
 246                         errno = failure_errno;
 247                         error_errno(_("failed to look up reference"));
 248                         ret = 1;
 249                 }
 250
 251                 goto out;
 252         }
 253
 254 out:
 255         strbuf_release(&unused_referent);
 256         return ret;
 257 }
 258
 259 static int hash_callback(const struct option *opt, const char *arg, int unset)
 260 {
 261         struct show_one_options *opts = opt->value;
 262         struct option abbrev_opt = *opt;
 263
 264         opts->hash_only = 1;
 265         /* Use full length SHA1 if no argument */
 266         if (!arg)
 267                 return 0;
 268
 269         abbrev_opt.value = &opts->abbrev;
 270         return parse_opt_abbrev_cb(&abbrev_opt, arg, unset);
 271 }
 272
 273 static int exclude_existing_callback(const struct option *opt, const char *arg,
 274                                      int unset)
 275 {
 276         struct exclude_existing_options *opts = opt->value;
 277         BUG_ON_OPT_NEG(unset);
 278         opts->enabled = 1;
 279         opts->pattern = arg;
 280         return 0;
 281 }
 282
 283 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 284 {
 285         struct exclude_existing_options exclude_existing_opts = {0};
 286         struct patterns_options patterns_opts = {0};
 287         struct show_one_options show_one_opts = {0};
 288         int verify = 0, exists = 0;
 289         const struct option show_ref_options[] = {
 290                 OPT_BOOL(0, "tags", &patterns_opts.tags_only, N_("only show tags (can be combined with heads)")),
 291                 OPT_BOOL(0, "heads", &patterns_opts.heads_only, N_("only show heads (can be combined with tags)")),
 292                 OPT_BOOL(0, "exists", &exists, N_("check for reference existence without resolving")),
 293                 OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
 294                             "requires exact ref path")),
 295                 OPT_HIDDEN_BOOL('h', NULL, &patterns_opts.show_head,
 296                                 N_("show the HEAD reference, even if it would be filtered out")),
 297                 OPT_BOOL(0, "head", &patterns_opts.show_head,
 298                   N_("show the HEAD reference, even if it would be filtered out")),
 299                 OPT_BOOL('d', "dereference", &show_one_opts.deref_tags,
 300                             N_("dereference tags into object IDs")),
 301                 OPT_CALLBACK_F('s', "hash", &show_one_opts, N_("n"),
 302                                N_("only show SHA1 hash using <n> digits"),
 303                                PARSE_OPT_OPTARG, &hash_callback),
 304                 OPT__ABBREV(&show_one_opts.abbrev),
 305                 OPT__QUIET(&show_one_opts.quiet,
 306                            N_("do not print results to stdout (useful with --verify)")),
 307                 OPT_CALLBACK_F(0, "exclude-existing", &exclude_existing_opts,
 308                                N_("pattern"), N_("show refs from stdin that aren't in local repository"),
 309                                PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback),
 310                 OPT_END()
 311         };
 312
 313         git_config(git_default_config, NULL);
 314
 315         argc = parse_options(argc, argv, prefix, show_ref_options,
 316                              show_ref_usage, 0);
 317
 318         die_for_incompatible_opt3(exclude_existing_opts.enabled, "--exclude-existing",
 319                                   verify, "--verify",
 320                                   exists, "--exists");
 321
 322         if (exclude_existing_opts.enabled)
 323                 return cmd_show_ref__exclude_existing(&exclude_existing_opts);
 324         else if (verify)
 325                 return cmd_show_ref__verify(&show_one_opts, argv);
 326         else if (exists)
 327                 return cmd_show_ref__exists(argv);
 328         else
 329                 return cmd_show_ref__patterns(&patterns_opts, &show_one_opts, argv);
 330 }