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*] | --filter-invalid < 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 && !strncmp(refname, "refs/heads/", 11);
  32                 match |= tags_only && !strncmp(refname, "refs/tags/", 10);
  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                 int len = strlen(buf);
 120                 char *ref;
 121                 if (len > 0 && buf[len - 1] == '\n')
 122                         buf[--len] = '\0';
 123                 if (!strcmp(buf + len - 3, "^{}")) {
 124                         len -= 3;
 125                         buf[len] = '\0';
 126                 }
 127                 for (ref = buf + len; buf < ref; ref--)
 128                         if (isspace(ref[-1]))
 129                                 break;
 130                 if (match) {
 131                         int reflen = buf + len - ref;
 132                         if (reflen < matchlen)
 133                                 continue;
 134                         if (strncmp(ref, match, matchlen))
 135                                 continue;
 136                 }
 137                 if (check_ref_format(ref)) {
 138                         fprintf(stderr, "warning: ref '%s' ignored\n", ref);
 139                         continue;
 140                 }
 141                 if (!path_list_has_path(&existing_refs, ref)) {
 142                         printf("%s\n", buf);
 143                 }
 144         }
 145         return 0;
 146 }
 147
 148 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 149 {
 150         int i;
 151
 152         for (i = 1; i < argc; i++) {
 153                 const char *arg = argv[i];
 154                 if (*arg != '-') {
 155                         pattern = argv + i;
 156                         break;
 157                 }
 158                 if (!strcmp(arg, "--")) {
 159                         pattern = argv + i + 1;
 160                         if (!*pattern)
 161                                 pattern = NULL;
 162                         break;
 163                 }
 164                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 165                         quiet = 1;
 166                         continue;
 167                 }
 168                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 169                         show_head = 1;
 170                         continue;
 171                 }
 172                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 173                         deref_tags = 1;
 174                         continue;
 175                 }
 176                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 177                         hash_only = 1;
 178                         continue;
 179                 }
 180                 if (!strncmp(arg, "--hash=", 7) ||
 181                     (!strncmp(arg, "--abbrev", 8) &&
 182                      (arg[8] == '=' || arg[8] == '\0'))) {
 183                         if (arg[2] != 'h' && !arg[8])
 184                                 /* --abbrev only */
 185                                 abbrev = DEFAULT_ABBREV;
 186                         else {
 187                                 /* --hash= or --abbrev= */
 188                                 char *end;
 189                                 if (arg[2] == 'h') {
 190                                         hash_only = 1;
 191                                         arg += 7;
 192                                 }
 193                                 else
 194                                         arg += 9;
 195                                 abbrev = strtoul(arg, &end, 10);
 196                                 if (*end || abbrev > 40)
 197                                         usage(show_ref_usage);
 198                                 if (abbrev < MINIMUM_ABBREV)
 199                                         abbrev = MINIMUM_ABBREV;
 200                         }
 201                         continue;
 202                 }
 203                 if (!strcmp(arg, "--verify")) {
 204                         verify = 1;
 205                         continue;
 206                 }
 207                 if (!strcmp(arg, "--tags")) {
 208                         tags_only = 1;
 209                         continue;
 210                 }
 211                 if (!strcmp(arg, "--heads")) {
 212                         heads_only = 1;
 213                         continue;
 214                 }
 215                 if (!strcmp(arg, "--exclude-existing"))
 216                         return exclude_existing(NULL);
 217                 if (!strncmp(arg, "--exclude-existing=", 19))
 218                         return exclude_existing(arg + 19);
 219                 usage(show_ref_usage);
 220         }
 221
 222         if (verify) {
 223                 unsigned char sha1[20];
 224
 225                 while (*pattern) {
 226                         if (!strncmp(*pattern, "refs/", 5) &&
 227                             resolve_ref(*pattern, sha1, 1, NULL)) {
 228                                 if (!quiet)
 229                                         show_one(*pattern, sha1);
 230                         }
 231                         else if (!quiet)
 232                                 die("'%s' - not a valid ref", *pattern);
 233                         else
 234                                 return 1;
 235                         pattern++;
 236                 }
 237                 return 0;
 238         }
 239
 240         if (show_head)
 241                 head_ref(show_ref, NULL);
 242         for_each_ref(show_ref, NULL);
 243         if (!found_match) {
 244                 if (verify && !quiet)
 245                         die("No match");
 246                 return 1;
 247         }
 248         return 0;
 249 }