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 "path-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                         hex = find_unique_abbrev(obj->sha1, abbrev);
  90                         printf("%s %s^{}\n", hex, refname);
  91                 }
  92         }
  93         return 0;
  94 }
  95
  96 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  97 {
  98         struct path_list *list = (struct path_list *)cbdata;
  99         path_list_insert(refname, list);
 100         return 0;
 101 }
 102
 103 /*
 104  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 105  * and
 106  * (1) strip "^{}" at the end of line if any;
 107  * (2) ignore if match is provided and does not head-match refname;
 108  * (3) warn if refname is not a well-formed refname and skip;
 109  * (4) ignore if refname is a ref that exists in the local repository;
 110  * (5) otherwise output the line.
 111  */
 112 static int exclude_existing(const char *match)
 113 {
 114         static struct path_list existing_refs = { NULL, 0, 0, 0 };
 115         char buf[1024];
 116         int matchlen = match ? strlen(match) : 0;
 117
 118         for_each_ref(add_existing, &existing_refs);
 119         while (fgets(buf, sizeof(buf), stdin)) {
 120                 char *ref;
 121                 int len = strlen(buf);
 122
 123                 if (len > 0 && buf[len - 1] == '\n')
 124                         buf[--len] = '\0';
 125                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 126                         len -= 3;
 127                         buf[len] = '\0';
 128                 }
 129                 for (ref = buf + len; buf < ref; ref--)
 130                         if (isspace(ref[-1]))
 131                                 break;
 132                 if (match) {
 133                         int reflen = buf + len - ref;
 134                         if (reflen < matchlen)
 135                                 continue;
 136                         if (strncmp(ref, match, matchlen))
 137                                 continue;
 138                 }
 139                 if (check_ref_format(ref)) {
 140                         fprintf(stderr, "warning: ref '%s' ignored\n", ref);
 141                         continue;
 142                 }
 143                 if (!path_list_has_path(&existing_refs, ref)) {
 144                         printf("%s\n", buf);
 145                 }
 146         }
 147         return 0;
 148 }
 149
 150 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 151 {
 152         int i;
 153
 154         for (i = 1; i < argc; i++) {
 155                 const char *arg = argv[i];
 156                 if (*arg != '-') {
 157                         pattern = argv + i;
 158                         break;
 159                 }
 160                 if (!strcmp(arg, "--")) {
 161                         pattern = argv + i + 1;
 162                         if (!*pattern)
 163                                 pattern = NULL;
 164                         break;
 165                 }
 166                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 167                         quiet = 1;
 168                         continue;
 169                 }
 170                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 171                         show_head = 1;
 172                         continue;
 173                 }
 174                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 175                         deref_tags = 1;
 176                         continue;
 177                 }
 178                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 179                         hash_only = 1;
 180                         continue;
 181                 }
 182                 if (!prefixcmp(arg, "--hash=") ||
 183                     (!prefixcmp(arg, "--abbrev") &&
 184                      (arg[8] == '=' || arg[8] == '\0'))) {
 185                         if (arg[2] != 'h' && !arg[8])
 186                                 /* --abbrev only */
 187                                 abbrev = DEFAULT_ABBREV;
 188                         else {
 189                                 /* --hash= or --abbrev= */
 190                                 char *end;
 191                                 if (arg[2] == 'h') {
 192                                         hash_only = 1;
 193                                         arg += 7;
 194                                 }
 195                                 else
 196                                         arg += 9;
 197                                 abbrev = strtoul(arg, &end, 10);
 198                                 if (*end || abbrev > 40)
 199                                         usage(show_ref_usage);
 200                                 if (abbrev < MINIMUM_ABBREV)
 201                                         abbrev = MINIMUM_ABBREV;
 202                         }
 203                         continue;
 204                 }
 205                 if (!strcmp(arg, "--verify")) {
 206                         verify = 1;
 207                         continue;
 208                 }
 209                 if (!strcmp(arg, "--tags")) {
 210                         tags_only = 1;
 211                         continue;
 212                 }
 213                 if (!strcmp(arg, "--heads")) {
 214                         heads_only = 1;
 215                         continue;
 216                 }
 217                 if (!strcmp(arg, "--exclude-existing"))
 218                         return exclude_existing(NULL);
 219                 if (!prefixcmp(arg, "--exclude-existing="))
 220                         return exclude_existing(arg + 19);
 221                 usage(show_ref_usage);
 222         }
 223
 224         if (verify) {
 225                 if (!pattern)
 226                         die("--verify requires a reference");
 227                 while (*pattern) {
 228                         unsigned char sha1[20];
 229
 230                         if (!prefixcmp(*pattern, "refs/") &&
 231                             resolve_ref(*pattern, sha1, 1, NULL)) {
 232                                 if (!quiet)
 233                                         show_one(*pattern, sha1);
 234                         }
 235                         else if (!quiet)
 236                                 die("'%s' - not a valid ref", *pattern);
 237                         else
 238                                 return 1;
 239                         pattern++;
 240                 }
 241                 return 0;
 242         }
 243
 244         if (show_head)
 245                 head_ref(show_ref, NULL);
 246         for_each_ref(show_ref, NULL);
 247         if (!found_match) {
 248                 if (verify && !quiet)
 249                         die("No match");
 250                 return 1;
 251         }
 252         return 0;
 253 }