refspec.c

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