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         } else {
  53                 item->dst = NULL;
  54         }
  55
  56         llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
  57         if (1 <= llen && memchr(lhs, '*', llen)) {
  58                 if ((rhs && !is_glob) || (!rhs && fetch))
  59                         return 0;
  60                 is_glob = 1;
  61         } else if (rhs && is_glob) {
  62                 return 0;
  63         }
  64
  65         item->pattern = is_glob;
  66         item->src = xstrndup(lhs, llen);
  67         flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
  68
  69         if (fetch) {
  70                 struct object_id unused;
  71
  72                 /* LHS */
  73                 if (!*item->src)
  74                         ; /* empty is ok; it means "HEAD" */
  75                 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(item->src, &unused))
  76                         item->exact_sha1 = 1; /* ok */
  77                 else if (!check_refname_format(item->src, flags))
  78                         ; /* valid looking ref is ok */
  79                 else
  80                         return 0;
  81                 /* RHS */
  82                 if (!item->dst)
  83                         ; /* missing is ok; it is the same as empty */
  84                 else if (!*item->dst)
  85                         ; /* empty is ok; it means "do not store" */
  86                 else if (!check_refname_format(item->dst, flags))
  87                         ; /* valid looking ref is ok */
  88                 else
  89                         return 0;
  90         } else {
  91                 /*
  92                  * LHS
  93                  * - empty is allowed; it means delete.
  94                  * - when wildcarded, it must be a valid looking ref.
  95                  * - otherwise, it must be an extended SHA-1, but
  96                  *   there is no existing way to validate this.
  97                  */
  98                 if (!*item->src)
  99                         ; /* empty is ok */
 100                 else if (is_glob) {
 101                         if (check_refname_format(item->src, flags))
 102                                 return 0;
 103                 }
 104                 else
 105                         ; /* anything goes, for now */
 106                 /*
 107                  * RHS
 108                  * - missing is allowed, but LHS then must be a
 109                  *   valid looking ref.
 110                  * - empty is not allowed.
 111                  * - otherwise it must be a valid looking ref.
 112                  */
 113                 if (!item->dst) {
 114                         if (check_refname_format(item->src, flags))
 115                                 return 0;
 116                 } else if (!*item->dst) {
 117                         return 0;
 118                 } else {
 119                         if (check_refname_format(item->dst, flags))
 120                                 return 0;
 121                 }
 122         }
 123
 124         return 1;
 125 }
 126
 127 void refspec_item_init(struct refspec_item *item, const char *refspec, int fetch)
 128 {
 129         memset(item, 0, sizeof(*item));
 130
 131         if (!parse_refspec(item, refspec, fetch))
 132                 die("Invalid refspec '%s'", refspec);
 133 }
 134
 135 void refspec_item_clear(struct refspec_item *item)
 136 {
 137         FREE_AND_NULL(item->src);
 138         FREE_AND_NULL(item->dst);
 139         item->force = 0;
 140         item->pattern = 0;
 141         item->matching = 0;
 142         item->exact_sha1 = 0;
 143 }
 144
 145 void refspec_init(struct refspec *rs, int fetch)
 146 {
 147         memset(rs, 0, sizeof(*rs));
 148         rs->fetch = fetch;
 149 }
 150
 151 void refspec_append(struct refspec *rs, const char *refspec)
 152 {
 153         struct refspec_item item;
 154
 155         refspec_item_init(&item, refspec, rs->fetch);
 156
 157         ALLOC_GROW(rs->items, rs->nr + 1, rs->alloc);
 158         rs->items[rs->nr++] = item;
 159
 160         ALLOC_GROW(rs->raw, rs->raw_nr + 1, rs->raw_alloc);
 161         rs->raw[rs->raw_nr++] = xstrdup(refspec);
 162 }
 163
 164 void refspec_appendn(struct refspec *rs, const char **refspecs, int nr)
 165 {
 166         int i;
 167         for (i = 0; i < nr; i++)
 168                 refspec_append(rs, refspecs[i]);
 169 }
 170
 171 void refspec_clear(struct refspec *rs)
 172 {
 173         int i;
 174
 175         for (i = 0; i < rs->nr; i++)
 176                 refspec_item_clear(&rs->items[i]);
 177
 178         FREE_AND_NULL(rs->items);
 179         rs->alloc = 0;
 180         rs->nr = 0;
 181
 182         for (i = 0; i < rs->raw_nr; i++)
 183                 free((char *)rs->raw[i]);
 184         FREE_AND_NULL(rs->raw);
 185         rs->raw_alloc = 0;
 186         rs->raw_nr = 0;
 187
 188         rs->fetch = 0;
 189 }
 190
 191 int valid_fetch_refspec(const char *fetch_refspec_str)
 192 {
 193         struct refspec_item refspec;
 194         int ret = parse_refspec(&refspec, fetch_refspec_str, REFSPEC_FETCH);
 195         refspec_item_clear(&refspec);
 196         return ret;
 197 }
 198
 199 void refspec_ref_prefixes(const struct refspec *rs,
 200                           struct argv_array *ref_prefixes)
 201 {
 202         int i;
 203         for (i = 0; i < rs->nr; i++) {
 204                 const struct refspec_item *item = &rs->items[i];
 205                 const char *prefix = NULL;
 206
 207                 if (item->exact_sha1)
 208                         continue;
 209                 if (rs->fetch == REFSPEC_FETCH)
 210                         prefix = item->src;
 211                 else if (item->dst)
 212                         prefix = item->dst;
 213                 else if (item->src && !item->exact_sha1)
 214                         prefix = item->src;
 215
 216                 if (prefix) {
 217                         if (item->pattern) {
 218                                 const char *glob = strchr(prefix, '*');
 219                                 argv_array_pushf(ref_prefixes, "%.*s",
 220                                                  (int)(glob - prefix),
 221                                                  prefix);
 222                         } else {
 223                                 expand_ref_prefix(ref_prefixes, prefix);
 224                         }
 225                 }
 226         }
 227 }