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
   8 static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] < ref-list";
   9
  10 static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
  11         found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
  12 static const char **pattern;
  13
  14 static void show_one(const char *refname, const unsigned char *sha1)
  15 {
  16         const char *hex = find_unique_abbrev(sha1, abbrev);
  17         if (hash_only)
  18                 printf("%s\n", hex);
  19         else
  20                 printf("%s %s\n", hex, refname);
  21 }
  22
  23 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  24 {
  25         struct object *obj;
  26         const char *hex;
  27         unsigned char peeled[20];
  28
  29         if (tags_only || heads_only) {
  30                 int match;
  31
  32                 match = heads_only && !prefixcmp(refname, "refs/heads/");
  33                 match |= tags_only && !prefixcmp(refname, "refs/tags/");
  34                 if (!match)
  35                         return 0;
  36         }
  37         if (pattern) {
  38                 int reflen = strlen(refname);
  39                 const char **p = pattern, *m;
  40                 while ((m = *p++) != NULL) {
  41                         int len = strlen(m);
  42                         if (len > reflen)
  43                                 continue;
  44                         if (memcmp(m, refname + reflen - len, len))
  45                                 continue;
  46                         if (len == reflen)
  47                                 goto match;
  48                         /* "--verify" requires an exact match */
  49                         if (verify)
  50                                 continue;
  51                         if (refname[reflen - len - 1] == '/')
  52                                 goto match;
  53                 }
  54                 return 0;
  55         }
  56
  57 match:
  58         found_match++;
  59
  60         /* This changes the semantics slightly that even under quiet we
  61          * detect and return error if the repository is corrupt and
  62          * ref points at a nonexistent object.
  63          */
  64         if (!has_sha1_file(sha1))
  65                 die("git show-ref: bad ref %s (%s)", refname,
  66                     sha1_to_hex(sha1));
  67
  68         if (quiet)
  69                 return 0;
  70
  71         show_one(refname, sha1);
  72
  73         if (!deref_tags)
  74                 return 0;
  75
  76         if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
  77                 if (!is_null_sha1(peeled)) {
  78                         hex = find_unique_abbrev(peeled, abbrev);
  79                         printf("%s %s^{}\n", hex, refname);
  80                 }
  81         }
  82         else {
  83                 obj = parse_object(sha1);
  84                 if (!obj)
  85                         die("git show-ref: bad ref %s (%s)", refname,
  86                             sha1_to_hex(sha1));
  87                 if (obj->type == OBJ_TAG) {
  88                         obj = deref_tag(obj, refname, 0);
  89                         if (!obj)
  90                                 die("git show-ref: bad tag at ref %s (%s)", refname,
  91                                     sha1_to_hex(sha1));
  92                         hex = find_unique_abbrev(obj->sha1, abbrev);
  93                         printf("%s %s^{}\n", hex, refname);
  94                 }
  95         }
  96         return 0;
  97 }
  98
  99 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
 100 {
 101         struct string_list *list = (struct string_list *)cbdata;
 102         string_list_insert(refname, list);
 103         return 0;
 104 }
 105
 106 /*
 107  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 108  * and
 109  * (1) strip "^{}" at the end of line if any;
 110  * (2) ignore if match is provided and does not head-match refname;
 111  * (3) warn if refname is not a well-formed refname and skip;
 112  * (4) ignore if refname is a ref that exists in the local repository;
 113  * (5) otherwise output the line.
 114  */
 115 static int exclude_existing(const char *match)
 116 {
 117         static struct string_list existing_refs = { NULL, 0, 0, 0 };
 118         char buf[1024];
 119         int matchlen = match ? strlen(match) : 0;
 120
 121         for_each_ref(add_existing, &existing_refs);
 122         while (fgets(buf, sizeof(buf), stdin)) {
 123                 char *ref;
 124                 int len = strlen(buf);
 125
 126                 if (len > 0 && buf[len - 1] == '\n')
 127                         buf[--len] = '\0';
 128                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 129                         len -= 3;
 130                         buf[len] = '\0';
 131                 }
 132                 for (ref = buf + len; buf < ref; ref--)
 133                         if (isspace(ref[-1]))
 134                                 break;
 135                 if (match) {
 136                         int reflen = buf + len - ref;
 137                         if (reflen < matchlen)
 138                                 continue;
 139                         if (strncmp(ref, match, matchlen))
 140                                 continue;
 141                 }
 142                 if (check_ref_format(ref)) {
 143                         fprintf(stderr, "warning: ref '%s' ignored\n", ref);
 144                         continue;
 145                 }
 146                 if (!string_list_has_string(&existing_refs, ref)) {
 147                         printf("%s\n", buf);
 148                 }
 149         }
 150         return 0;
 151 }
 152
 153 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 154 {
 155         int i;
 156
 157         for (i = 1; i < argc; i++) {
 158                 const char *arg = argv[i];
 159                 if (*arg != '-') {
 160                         pattern = argv + i;
 161                         break;
 162                 }
 163                 if (!strcmp(arg, "--")) {
 164                         pattern = argv + i + 1;
 165                         if (!*pattern)
 166                                 pattern = NULL;
 167                         break;
 168                 }
 169                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 170                         quiet = 1;
 171                         continue;
 172                 }
 173                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 174                         show_head = 1;
 175                         continue;
 176                 }
 177                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 178                         deref_tags = 1;
 179                         continue;
 180                 }
 181                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 182                         hash_only = 1;
 183                         continue;
 184                 }
 185                 if (!prefixcmp(arg, "--hash=") ||
 186                     (!prefixcmp(arg, "--abbrev") &&
 187                      (arg[8] == '=' || arg[8] == '\0'))) {
 188                         if (arg[2] != 'h' && !arg[8])
 189                                 /* --abbrev only */
 190                                 abbrev = DEFAULT_ABBREV;
 191                         else {
 192                                 /* --hash= or --abbrev= */
 193                                 char *end;
 194                                 if (arg[2] == 'h') {
 195                                         hash_only = 1;
 196                                         arg += 7;
 197                                 }
 198                                 else
 199                                         arg += 9;
 200                                 abbrev = strtoul(arg, &end, 10);
 201                                 if (*end || abbrev > 40)
 202                                         usage(show_ref_usage);
 203                                 if (abbrev < MINIMUM_ABBREV)
 204                                         abbrev = MINIMUM_ABBREV;
 205                         }
 206                         continue;
 207                 }
 208                 if (!strcmp(arg, "--verify")) {
 209                         verify = 1;
 210                         continue;
 211                 }
 212                 if (!strcmp(arg, "--tags")) {
 213                         tags_only = 1;
 214                         continue;
 215                 }
 216                 if (!strcmp(arg, "--heads")) {
 217                         heads_only = 1;
 218                         continue;
 219                 }
 220                 if (!strcmp(arg, "--exclude-existing"))
 221                         return exclude_existing(NULL);
 222                 if (!prefixcmp(arg, "--exclude-existing="))
 223                         return exclude_existing(arg + 19);
 224                 usage(show_ref_usage);
 225         }
 226
 227         if (verify) {
 228                 if (!pattern)
 229                         die("--verify requires a reference");
 230                 while (*pattern) {
 231                         unsigned char sha1[20];
 232
 233                         if (!prefixcmp(*pattern, "refs/") &&
 234                             resolve_ref(*pattern, sha1, 1, NULL)) {
 235                                 if (!quiet)
 236                                         show_one(*pattern, sha1);
 237                         }
 238                         else if (!quiet)
 239                                 die("'%s' - not a valid ref", *pattern);
 240                         else
 241                                 return 1;
 242                         pattern++;
 243                 }
 244                 return 0;
 245         }
 246
 247         if (show_head)
 248                 head_ref(show_ref, NULL);
 249         for_each_ref(show_ref, NULL);
 250         if (!found_match) {
 251                 if (verify && !quiet)
 252                         die("No match");
 253                 return 1;
 254         }
 255         return 0;
 256 }