builtin/show-ref.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4 #include "object-store.h"
   5 #include "object.h"
   6 #include "tag.h"
   7 #include "string-list.h"
   8 #include "parse-options.h"
   9
  10 static const char * const show_ref_usage[] = {
  11         N_("git show-ref [-q | --quiet] [--verify] [--head] [-d | --dereference] [-s | --hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [<pattern>...]"),
  12         N_("git show-ref --exclude-existing[=<pattern>]"),
  13         NULL
  14 };
  15
  16 static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
  17            quiet, hash_only, abbrev, exclude_arg;
  18 static const char **pattern;
  19 static const char *exclude_existing_arg;
  20
  21 static void show_one(const char *refname, const struct object_id *oid)
  22 {
  23         const char *hex;
  24         struct object_id peeled;
  25
  26         if (!has_sha1_file(oid->hash))
  27                 die("git show-ref: bad ref %s (%s)", refname,
  28                     oid_to_hex(oid));
  29
  30         if (quiet)
  31                 return;
  32
  33         hex = find_unique_abbrev(oid, abbrev);
  34         if (hash_only)
  35                 printf("%s\n", hex);
  36         else
  37                 printf("%s %s\n", hex, refname);
  38
  39         if (!deref_tags)
  40                 return;
  41
  42         if (!peel_ref(refname, &peeled)) {
  43                 hex = find_unique_abbrev(&peeled, abbrev);
  44                 printf("%s %s^{}\n", hex, refname);
  45         }
  46 }
  47
  48 static int show_ref(const char *refname, const struct object_id *oid,
  49                     int flag, void *cbdata)
  50 {
  51         if (show_head && !strcmp(refname, "HEAD"))
  52                 goto match;
  53
  54         if (tags_only || heads_only) {
  55                 int match;
  56
  57                 match = heads_only && starts_with(refname, "refs/heads/");
  58                 match |= tags_only && starts_with(refname, "refs/tags/");
  59                 if (!match)
  60                         return 0;
  61         }
  62         if (pattern) {
  63                 int reflen = strlen(refname);
  64                 const char **p = pattern, *m;
  65                 while ((m = *p++) != NULL) {
  66                         int len = strlen(m);
  67                         if (len > reflen)
  68                                 continue;
  69                         if (memcmp(m, refname + reflen - len, len))
  70                                 continue;
  71                         if (len == reflen)
  72                                 goto match;
  73                         if (refname[reflen - len - 1] == '/')
  74                                 goto match;
  75                 }
  76                 return 0;
  77         }
  78
  79 match:
  80         found_match++;
  81
  82         show_one(refname, oid);
  83
  84         return 0;
  85 }
  86
  87 static int add_existing(const char *refname, const struct object_id *oid,
  88                         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         BUG_ON_OPT_NEG(unset);
 155         exclude_arg = 1;
 156         *(const char **)opt->value = arg;
 157         return 0;
 158 }
 159
 160 static const struct option show_ref_options[] = {
 161         OPT_BOOL(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
 162         OPT_BOOL(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
 163         OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
 164                     "requires exact ref path")),
 165         OPT_HIDDEN_BOOL('h', NULL, &show_head,
 166                         N_("show the HEAD reference, even if it would be filtered out")),
 167         OPT_BOOL(0, "head", &show_head,
 168           N_("show the HEAD reference, even if it would be filtered out")),
 169         OPT_BOOL('d', "dereference", &deref_tags,
 170                     N_("dereference tags into object IDs")),
 171         { OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"),
 172           N_("only show SHA1 hash using <n> digits"),
 173           PARSE_OPT_OPTARG, &hash_callback },
 174         OPT__ABBREV(&abbrev),
 175         OPT__QUIET(&quiet,
 176                    N_("do not print results to stdout (useful with --verify)")),
 177         { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
 178           N_("pattern"), N_("show refs from stdin that aren't in local repository"),
 179           PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
 180         OPT_END()
 181 };
 182
 183 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 184 {
 185         argc = parse_options(argc, argv, prefix, show_ref_options,
 186                              show_ref_usage, 0);
 187
 188         if (exclude_arg)
 189                 return exclude_existing(exclude_existing_arg);
 190
 191         pattern = argv;
 192         if (!*pattern)
 193                 pattern = NULL;
 194
 195         if (verify) {
 196                 if (!pattern)
 197                         die("--verify requires a reference");
 198                 while (*pattern) {
 199                         struct object_id oid;
 200
 201                         if ((starts_with(*pattern, "refs/") || !strcmp(*pattern, "HEAD")) &&
 202                             !read_ref(*pattern, &oid)) {
 203                                 show_one(*pattern, &oid);
 204                         }
 205                         else if (!quiet)
 206                                 die("'%s' - not a valid ref", *pattern);
 207                         else
 208                                 return 1;
 209                         pattern++;
 210                 }
 211                 return 0;
 212         }
 213
 214         if (show_head)
 215                 head_ref(show_ref, NULL);
 216         for_each_ref(show_ref, NULL);
 217         if (!found_match) {
 218                 if (verify && !quiet)
 219                         die("No match");
 220                 return 1;
 221         }
 222         return 0;
 223 }