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         "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [pattern*] ",
  11         "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         struct object *obj;
  32         const char *hex;
  33         unsigned char peeled[20];
  34
  35         if (tags_only || heads_only) {
  36                 int match;
  37
  38                 match = heads_only && !prefixcmp(refname, "refs/heads/");
  39                 match |= tags_only && !prefixcmp(refname, "refs/tags/");
  40                 if (!match)
  41                         return 0;
  42         }
  43         if (pattern) {
  44                 int reflen = strlen(refname);
  45                 const char **p = pattern, *m;
  46                 while ((m = *p++) != NULL) {
  47                         int len = strlen(m);
  48                         if (len > reflen)
  49                                 continue;
  50                         if (memcmp(m, refname + reflen - len, len))
  51                                 continue;
  52                         if (len == reflen)
  53                                 goto match;
  54                         /* "--verify" requires an exact match */
  55                         if (verify)
  56                                 continue;
  57                         if (refname[reflen - len - 1] == '/')
  58                                 goto match;
  59                 }
  60                 return 0;
  61         }
  62
  63 match:
  64         found_match++;
  65
  66         /* This changes the semantics slightly that even under quiet we
  67          * detect and return error if the repository is corrupt and
  68          * ref points at a nonexistent object.
  69          */
  70         if (!has_sha1_file(sha1))
  71                 die("git show-ref: bad ref %s (%s)", refname,
  72                     sha1_to_hex(sha1));
  73
  74         if (quiet)
  75                 return 0;
  76
  77         show_one(refname, sha1);
  78
  79         if (!deref_tags)
  80                 return 0;
  81
  82         if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
  83                 if (!is_null_sha1(peeled)) {
  84                         hex = find_unique_abbrev(peeled, abbrev);
  85                         printf("%s %s^{}\n", hex, refname);
  86                 }
  87         }
  88         else {
  89                 obj = parse_object(sha1);
  90                 if (!obj)
  91                         die("git show-ref: bad ref %s (%s)", refname,
  92                             sha1_to_hex(sha1));
  93                 if (obj->type == OBJ_TAG) {
  94                         obj = deref_tag(obj, refname, 0);
  95                         if (!obj)
  96                                 die("git show-ref: bad tag at ref %s (%s)", refname,
  97                                     sha1_to_hex(sha1));
  98                         hex = find_unique_abbrev(obj->sha1, abbrev);
  99                         printf("%s %s^{}\n", hex, refname);
 100                 }
 101         }
 102         return 0;
 103 }
 104
 105 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
 106 {
 107         struct string_list *list = (struct string_list *)cbdata;
 108         string_list_insert(refname, list);
 109         return 0;
 110 }
 111
 112 /*
 113  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 114  * and
 115  * (1) strip "^{}" at the end of line if any;
 116  * (2) ignore if match is provided and does not head-match refname;
 117  * (3) warn if refname is not a well-formed refname and skip;
 118  * (4) ignore if refname is a ref that exists in the local repository;
 119  * (5) otherwise output the line.
 120  */
 121 static int exclude_existing(const char *match)
 122 {
 123         static struct string_list existing_refs = { NULL, 0, 0, 0 };
 124         char buf[1024];
 125         int matchlen = match ? strlen(match) : 0;
 126
 127         for_each_ref(add_existing, &existing_refs);
 128         while (fgets(buf, sizeof(buf), stdin)) {
 129                 char *ref;
 130                 int len = strlen(buf);
 131
 132                 if (len > 0 && buf[len - 1] == '\n')
 133                         buf[--len] = '\0';
 134                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 135                         len -= 3;
 136                         buf[len] = '\0';
 137                 }
 138                 for (ref = buf + len; buf < ref; ref--)
 139                         if (isspace(ref[-1]))
 140                                 break;
 141                 if (match) {
 142                         int reflen = buf + len - ref;
 143                         if (reflen < matchlen)
 144                                 continue;
 145                         if (strncmp(ref, match, matchlen))
 146                                 continue;
 147                 }
 148                 if (check_ref_format(ref)) {
 149                         warning("ref '%s' ignored", ref);
 150                         continue;
 151                 }
 152                 if (!string_list_has_string(&existing_refs, ref)) {
 153                         printf("%s\n", buf);
 154                 }
 155         }
 156         return 0;
 157 }
 158
 159 static int hash_callback(const struct option *opt, const char *arg, int unset)
 160 {
 161         hash_only = 1;
 162         /* Use full length SHA1 if no argument */
 163         if (!arg)
 164                 return 0;
 165         return parse_opt_abbrev_cb(opt, arg, unset);
 166 }
 167
 168 static int exclude_existing_callback(const struct option *opt, const char *arg,
 169                                      int unset)
 170 {
 171         exclude_arg = 1;
 172         *(const char **)opt->value = arg;
 173         return 0;
 174 }
 175
 176 static int help_callback(const struct option *opt, const char *arg, int unset)
 177 {
 178         return -1;
 179 }
 180
 181 static const struct option show_ref_options[] = {
 182         OPT_BOOLEAN(0, "tags", &tags_only, "only show tags (can be combined with heads)"),
 183         OPT_BOOLEAN(0, "heads", &heads_only, "only show heads (can be combined with tags)"),
 184         OPT_BOOLEAN(0, "verify", &verify, "stricter reference checking, "
 185                     "requires exact ref path"),
 186         OPT_BOOLEAN('h', "head", &show_head, "show the HEAD reference"),
 187         OPT_BOOLEAN('d', "dereference", &deref_tags,
 188                     "dereference tags into object IDs"),
 189         { OPTION_CALLBACK, 's', "hash", &abbrev, "n",
 190           "only show SHA1 hash using <n> digits",
 191           PARSE_OPT_OPTARG, &hash_callback },
 192         OPT__ABBREV(&abbrev),
 193         OPT__QUIET(&quiet),
 194         { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
 195           "pattern", "show refs from stdin that aren't in local repository",
 196           PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
 197         { OPTION_CALLBACK, 0, "help-all", NULL, NULL, "show usage",
 198           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 199         OPT_END()
 200 };
 201
 202 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 203 {
 204         argc = parse_options(argc, argv, prefix, show_ref_options,
 205                              show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);
 206
 207         if (exclude_arg)
 208                 return exclude_existing(exclude_existing_arg);
 209
 210         pattern = argv;
 211         if (!*pattern)
 212                 pattern = NULL;
 213
 214         if (verify) {
 215                 if (!pattern)
 216                         die("--verify requires a reference");
 217                 while (*pattern) {
 218                         unsigned char sha1[20];
 219
 220                         if (!prefixcmp(*pattern, "refs/") &&
 221                             resolve_ref(*pattern, sha1, 1, NULL)) {
 222                                 if (!quiet)
 223                                         show_one(*pattern, sha1);
 224                         }
 225                         else if (!quiet)
 226                                 die("'%s' - not a valid ref", *pattern);
 227                         else
 228                                 return 1;
 229                         pattern++;
 230                 }
 231                 return 0;
 232         }
 233
 234         if (show_head)
 235                 head_ref(show_ref, NULL);
 236         for_each_ref(show_ref, NULL);
 237         if (!found_match) {
 238                 if (verify && !quiet)
 239                         die("No match");
 240                 return 1;
 241         }
 242         return 0;
 243 }