refspec.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "refspec.h"
   4
   5 static struct refspec_item s_tag_refspec = {
   6         0,
   7         1,
   8         0,
   9         0,
  10         "refs/tags/*",
  11         "refs/tags/*"
  12 };
  13
  14 /* See TAG_REFSPEC for the string version */
  15 const struct refspec_item *tag_refspec = &s_tag_refspec;
  16
  17 /*
  18  * Parses the provided refspec 'refspec' and populates the refspec_item 'item'.
  19  * Returns 1 if successful and 0 if the refspec is invalid.
  20  */
  21 static int parse_refspec(struct refspec_item *item, const char *refspec, int fetch)
  22 {
  23         size_t llen;
  24         int is_glob;
  25         const char *lhs, *rhs;
  26         int flags;
  27
  28         is_glob = 0;
  29
  30         lhs = refspec;
  31         if (*lhs == '+') {
  32                 item->force = 1;
  33                 lhs++;
  34         }
  35
  36         rhs = strrchr(lhs, ':');
  37
  38         /*
  39          * Before going on, special case ":" (or "+:") as a refspec
  40          * for pushing matching refs.
  41          */
  42         if (!fetch && rhs == lhs && rhs[1] == '\0') {
  43                 item->matching = 1;
  44                 return 1;
  45         }
  46
  47         if (rhs) {
  48                 size_t rlen = strlen(++rhs);
  49                 is_glob = (1 <= rlen && strchr(rhs, '*'));
  50                 item->dst = xstrndup(rhs, rlen);
  51         }
  52
  53         llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
  54         if (1 <= llen && memchr(lhs, '*', llen)) {
  55                 if ((rhs && !is_glob) || (!rhs && fetch))
  56                         return 0;
  57                 is_glob = 1;
  58         } else if (rhs && is_glob) {
  59                 return 0;
  60         }
  61
  62         item->pattern = is_glob;
  63         item->src = xstrndup(lhs, llen);
  64         flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
  65
  66         if (fetch) {
  67                 struct object_id unused;
  68
  69                 /* LHS */
  70                 if (!*item->src)
  71                         ; /* empty is ok; it means "HEAD" */
  72                 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(item->src, &unused))
  73                         item->exact_sha1 = 1; /* ok */
  74                 else if (!check_refname_format(item->src, flags))
  75                         ; /* valid looking ref is ok */
  76                 else
  77                         return 0;
  78                 /* RHS */
  79                 if (!item->dst)
  80                         ; /* missing is ok; it is the same as empty */
  81                 else if (!*item->dst)
  82                         ; /* empty is ok; it means "do not store" */
  83                 else if (!check_refname_format(item->dst, flags))
  84                         ; /* valid looking ref is ok */
  85                 else
  86                         return 0;
  87         } else {
  88                 /*
  89                  * LHS
  90                  * - empty is allowed; it means delete.
  91                  * - when wildcarded, it must be a valid looking ref.
  92                  * - otherwise, it must be an extended SHA-1, but
  93                  *   there is no existing way to validate this.
  94                  */
  95                 if (!*item->src)
  96                         ; /* empty is ok */
  97                 else if (is_glob) {
  98                         if (check_refname_format(item->src, flags))
  99                                 return 0;
 100                 }
 101                 else
 102                         ; /* anything goes, for now */
 103                 /*
 104                  * RHS
 105                  * - missing is allowed, but LHS then must be a
 106                  *   valid looking ref.
 107                  * - empty is not allowed.
 108                  * - otherwise it must be a valid looking ref.
 109                  */
 110                 if (!item->dst) {
 111                         if (check_refname_format(item->src, flags))
 112                                 return 0;
 113                 } else if (!*item->dst) {
 114                         return 0;
 115                 } else {
 116                         if (check_refname_format(item->dst, flags))
 117                                 return 0;
 118                 }
 119         }
 120
 121         return 1;
 122 }
 123
 124 static struct refspec_item *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 125 {
 126         int i;
 127         struct refspec_item *rs = xcalloc(nr_refspec, sizeof(*rs));
 128
 129         for (i = 0; i < nr_refspec; i++) {
 130                 if (!parse_refspec(&rs[i], refspec[i], fetch))
 131                         goto invalid;
 132         }
 133
 134         return rs;
 135
 136  invalid:
 137         if (verify) {
 138                 /*
 139                  * nr_refspec must be greater than zero and i must be valid
 140                  * since it is only possible to reach this point from within
 141                  * the for loop above.
 142                  */
 143                 free_refspec(i+1, rs);
 144                 return NULL;
 145         }
 146         die("Invalid refspec '%s'", refspec[i]);
 147 }
 148
 149 struct refspec_item *parse_fetch_refspec(int nr_refspec, const char **refspec)
 150 {
 151         return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 152 }
 153
 154 struct refspec_item *parse_push_refspec(int nr_refspec, const char **refspec)
 155 {
 156         return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 157 }
 158
 159 void free_refspec(int nr_refspec, struct refspec_item *refspec)
 160 {
 161         int i;
 162
 163         if (!refspec)
 164                 return;
 165
 166         for (i = 0; i < nr_refspec; i++) {
 167                 free(refspec[i].src);
 168                 free(refspec[i].dst);
 169         }
 170         free(refspec);
 171 }
 172
 173 void refspec_item_init(struct refspec_item *item, const char *refspec, int fetch)
 174 {
 175         memset(item, 0, sizeof(*item));
 176
 177         if (!parse_refspec(item, refspec, fetch))
 178                 die("Invalid refspec '%s'", refspec);
 179 }
 180
 181 void refspec_item_clear(struct refspec_item *item)
 182 {
 183         FREE_AND_NULL(item->src);
 184         FREE_AND_NULL(item->dst);
 185         item->force = 0;
 186         item->pattern = 0;
 187         item->matching = 0;
 188         item->exact_sha1 = 0;
 189 }
 190
 191 void refspec_init(struct refspec *rs, int fetch)
 192 {
 193         memset(rs, 0, sizeof(*rs));
 194         rs->fetch = fetch;
 195 }
 196
 197 void refspec_append(struct refspec *rs, const char *refspec)
 198 {
 199         struct refspec_item item;
 200
 201         refspec_item_init(&item, refspec, rs->fetch);
 202
 203         ALLOC_GROW(rs->items, rs->nr + 1, rs->alloc);
 204         rs->items[rs->nr++] = item;
 205
 206         ALLOC_GROW(rs->raw, rs->raw_nr + 1, rs->raw_alloc);
 207         rs->raw[rs->raw_nr++] = xstrdup(refspec);
 208 }
 209
 210 void refspec_appendn(struct refspec *rs, const char **refspecs, int nr)
 211 {
 212         int i;
 213         for (i = 0; i < nr; i++)
 214                 refspec_append(rs, refspecs[i]);
 215 }
 216
 217 void refspec_clear(struct refspec *rs)
 218 {
 219         int i;
 220
 221         for (i = 0; i < rs->nr; i++)
 222                 refspec_item_clear(&rs->items[i]);
 223
 224         FREE_AND_NULL(rs->items);
 225         rs->alloc = 0;
 226         rs->nr = 0;
 227
 228         for (i = 0; i < rs->raw_nr; i++)
 229                 free((char *)rs->raw[i]);
 230         FREE_AND_NULL(rs->raw);
 231         rs->raw_alloc = 0;
 232         rs->raw_nr = 0;
 233
 234         rs->fetch = 0;
 235 }
 236
 237 int valid_fetch_refspec(const char *fetch_refspec_str)
 238 {
 239         struct refspec_item refspec;
 240         int ret = parse_refspec(&refspec, fetch_refspec_str, REFSPEC_FETCH);
 241         refspec_item_clear(&refspec);
 242         return ret;
 243 }