builtin-show-ref.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "object.h"
   4 #include "tag.h"
   5 #include "path-list.h"
   6
   7 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";
   8
   9 static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
  10         found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
  11 static const char **pattern;
  12
  13 static void show_one(const char *refname, const unsigned char *sha1)
  14 {
  15         const char *hex = find_unique_abbrev(sha1, abbrev);
  16         if (hash_only)
  17                 printf("%s\n", hex);
  18         else
  19                 printf("%s %s\n", hex, refname);
  20 }
  21
  22 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  23 {
  24         struct object *obj;
  25         const char *hex;
  26         unsigned char peeled[20];
  27
  28         if (tags_only || heads_only) {
  29                 int match;
  30
  31                 match = heads_only && !prefixcmp(refname, "refs/heads/");
  32                 match |= tags_only && !prefixcmp(refname, "refs/tags/");
  33                 if (!match)
  34                         return 0;
  35         }
  36         if (pattern) {
  37                 int reflen = strlen(refname);
  38                 const char **p = pattern, *m;
  39                 while ((m = *p++) != NULL) {
  40                         int len = strlen(m);
  41                         if (len > reflen)
  42                                 continue;
  43                         if (memcmp(m, refname + reflen - len, len))
  44                                 continue;
  45                         if (len == reflen)
  46                                 goto match;
  47                         /* "--verify" requires an exact match */
  48                         if (verify)
  49                                 continue;
  50                         if (refname[reflen - len - 1] == '/')
  51                                 goto match;
  52                 }
  53                 return 0;
  54         }
  55
  56 match:
  57         found_match++;
  58
  59         /* This changes the semantics slightly that even under quiet we
  60          * detect and return error if the repository is corrupt and
  61          * ref points at a nonexistent object.
  62          */
  63         if (!has_sha1_file(sha1))
  64                 die("git-show-ref: bad ref %s (%s)", refname,
  65                     sha1_to_hex(sha1));
  66
  67         if (quiet)
  68                 return 0;
  69
  70         show_one(refname, sha1);
  71
  72         if (!deref_tags)
  73                 return 0;
  74
  75         if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
  76                 if (!is_null_sha1(peeled)) {
  77                         hex = find_unique_abbrev(peeled, abbrev);
  78                         printf("%s %s^{}\n", hex, refname);
  79                 }
  80         }
  81         else {
  82                 obj = parse_object(sha1);
  83                 if (!obj)
  84                         die("git-show-ref: bad ref %s (%s)", refname,
  85                             sha1_to_hex(sha1));
  86                 if (obj->type == OBJ_TAG) {
  87                         obj = deref_tag(obj, refname, 0);
  88                         hex = find_unique_abbrev(obj->sha1, abbrev);
  89                         printf("%s %s^{}\n", hex, refname);
  90                 }
  91         }
  92         return 0;
  93 }
  94
  95 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  96 {
  97         struct path_list *list = (struct path_list *)cbdata;
  98         path_list_insert(refname, list);
  99         return 0;
 100 }
 101
 102 /*
 103  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 104  * and
 105  * (1) strip "^{}" at the end of line if any;
 106  * (2) ignore if match is provided and does not head-match refname;
 107  * (3) warn if refname is not a well-formed refname and skip;
 108  * (4) ignore if refname is a ref that exists in the local repository;
 109  * (5) otherwise output the line.
 110  */
 111 static int exclude_existing(const char *match)
 112 {
 113         static struct path_list existing_refs = { NULL, 0, 0, 0 };
 114         char buf[1024];
 115         int matchlen = match ? strlen(match) : 0;
 116
 117         for_each_ref(add_existing, &existing_refs);
 118         while (fgets(buf, sizeof(buf), stdin)) {
 119                 char *ref;
 120                 int len = strlen(buf);
 121
 122                 if (len > 0 && buf[len - 1] == '\n')
 123                         buf[--len] = '\0';
 124                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 125                         len -= 3;
 126                         buf[len] = '\0';
 127                 }
 128                 for (ref = buf + len; buf < ref; ref--)
 129                         if (isspace(ref[-1]))
 130                                 break;
 131                 if (match) {
 132                         int reflen = buf + len - ref;
 133                         if (reflen < matchlen)
 134                                 continue;
 135                         if (strncmp(ref, match, matchlen))
 136                                 continue;
 137                 }
 138                 if (check_ref_format(ref)) {
 139                         fprintf(stderr, "warning: ref '%s' ignored\n", ref);
 140                         continue;
 141                 }
 142                 if (!path_list_has_path(&existing_refs, ref)) {
 143                         printf("%s\n", buf);
 144                 }
 145         }
 146         return 0;
 147 }
 148
 149 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 150 {
 151         int i;
 152
 153         for (i = 1; i < argc; i++) {
 154                 const char *arg = argv[i];
 155                 if (*arg != '-') {
 156                         pattern = argv + i;
 157                         break;
 158                 }
 159                 if (!strcmp(arg, "--")) {
 160                         pattern = argv + i + 1;
 161                         if (!*pattern)
 162                                 pattern = NULL;
 163                         break;
 164                 }
 165                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 166                         quiet = 1;
 167                         continue;
 168                 }
 169                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 170                         show_head = 1;
 171                         continue;
 172                 }
 173                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 174                         deref_tags = 1;
 175                         continue;
 176                 }
 177                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 178                         hash_only = 1;
 179                         continue;
 180                 }
 181                 if (!prefixcmp(arg, "--hash=") ||
 182                     (!prefixcmp(arg, "--abbrev") &&
 183                      (arg[8] == '=' || arg[8] == '\0'))) {
 184                         if (arg[2] != 'h' && !arg[8])
 185                                 /* --abbrev only */
 186                                 abbrev = DEFAULT_ABBREV;
 187                         else {
 188                                 /* --hash= or --abbrev= */
 189                                 char *end;
 190                                 if (arg[2] == 'h') {
 191                                         hash_only = 1;
 192                                         arg += 7;
 193                                 }
 194                                 else
 195                                         arg += 9;
 196                                 abbrev = strtoul(arg, &end, 10);
 197                                 if (*end || abbrev > 40)
 198                                         usage(show_ref_usage);
 199                                 if (abbrev < MINIMUM_ABBREV)
 200                                         abbrev = MINIMUM_ABBREV;
 201                         }
 202                         continue;
 203                 }
 204                 if (!strcmp(arg, "--verify")) {
 205                         verify = 1;
 206                         continue;
 207                 }
 208                 if (!strcmp(arg, "--tags")) {
 209                         tags_only = 1;
 210                         continue;
 211                 }
 212                 if (!strcmp(arg, "--heads")) {
 213                         heads_only = 1;
 214                         continue;
 215                 }
 216                 if (!strcmp(arg, "--exclude-existing"))
 217                         return exclude_existing(NULL);
 218                 if (!prefixcmp(arg, "--exclude-existing="))
 219                         return exclude_existing(arg + 19);
 220                 usage(show_ref_usage);
 221         }
 222
 223         if (verify) {
 224                 if (!pattern)
 225                         die("--verify requires a reference");
 226                 while (*pattern) {
 227                         unsigned char sha1[20];
 228
 229                         if (!prefixcmp(*pattern, "refs/") &&
 230                             resolve_ref(*pattern, sha1, 1, NULL)) {
 231                                 if (!quiet)
 232                                         show_one(*pattern, sha1);
 233                         }
 234                         else if (!quiet)
 235                                 die("'%s' - not a valid ref", *pattern);
 236                         else
 237                                 return 1;
 238                         pattern++;
 239                 }
 240                 return 0;
 241         }
 242
 243         if (show_head)
 244                 head_ref(show_ref, NULL);
 245         for_each_ref(show_ref, NULL);
 246         if (!found_match) {
 247                 if (verify && !quiet)
 248                         die("No match");
 249                 return 1;
 250         }
 251         return 0;
 252 }