builtin/show-ref.c

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