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-rw-r--r--refspec.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/refspec.c b/refspec.c
new file mode 100644
index 0000000000..78edc48ae8
--- /dev/null
+++ b/refspec.c
@@ -0,0 +1,227 @@
+#include "cache.h"
+#include "argv-array.h"
+#include "refs.h"
+#include "refspec.h"
+
+static struct refspec_item s_tag_refspec = {
+ 0,
+ 1,
+ 0,
+ 0,
+ "refs/tags/*",
+ "refs/tags/*"
+};
+
+/* See TAG_REFSPEC for the string version */
+const struct refspec_item *tag_refspec = &s_tag_refspec;
+
+/*
+ * Parses the provided refspec 'refspec' and populates the refspec_item 'item'.
+ * Returns 1 if successful and 0 if the refspec is invalid.
+ */
+static int parse_refspec(struct refspec_item *item, const char *refspec, int fetch)
+{
+ size_t llen;
+ int is_glob;
+ const char *lhs, *rhs;
+ int flags;
+
+ is_glob = 0;
+
+ lhs = refspec;
+ if (*lhs == '+') {
+ item->force = 1;
+ lhs++;
+ }
+
+ rhs = strrchr(lhs, ':');
+
+ /*
+ * Before going on, special case ":" (or "+:") as a refspec
+ * for pushing matching refs.
+ */
+ if (!fetch && rhs == lhs && rhs[1] == '\0') {
+ item->matching = 1;
+ return 1;
+ }
+
+ if (rhs) {
+ size_t rlen = strlen(++rhs);
+ is_glob = (1 <= rlen && strchr(rhs, '*'));
+ item->dst = xstrndup(rhs, rlen);
+ } else {
+ item->dst = NULL;
+ }
+
+ llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
+ if (1 <= llen && memchr(lhs, '*', llen)) {
+ if ((rhs && !is_glob) || (!rhs && fetch))
+ return 0;
+ is_glob = 1;
+ } else if (rhs && is_glob) {
+ return 0;
+ }
+
+ item->pattern = is_glob;
+ item->src = xstrndup(lhs, llen);
+ flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
+
+ if (fetch) {
+ struct object_id unused;
+
+ /* LHS */
+ if (!*item->src)
+ ; /* empty is ok; it means "HEAD" */
+ else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(item->src, &unused))
+ item->exact_sha1 = 1; /* ok */
+ else if (!check_refname_format(item->src, flags))
+ ; /* valid looking ref is ok */
+ else
+ return 0;
+ /* RHS */
+ if (!item->dst)
+ ; /* missing is ok; it is the same as empty */
+ else if (!*item->dst)
+ ; /* empty is ok; it means "do not store" */
+ else if (!check_refname_format(item->dst, flags))
+ ; /* valid looking ref is ok */
+ else
+ return 0;
+ } else {
+ /*
+ * LHS
+ * - empty is allowed; it means delete.
+ * - when wildcarded, it must be a valid looking ref.
+ * - otherwise, it must be an extended SHA-1, but
+ * there is no existing way to validate this.
+ */
+ if (!*item->src)
+ ; /* empty is ok */
+ else if (is_glob) {
+ if (check_refname_format(item->src, flags))
+ return 0;
+ }
+ else
+ ; /* anything goes, for now */
+ /*
+ * RHS
+ * - missing is allowed, but LHS then must be a
+ * valid looking ref.
+ * - empty is not allowed.
+ * - otherwise it must be a valid looking ref.
+ */
+ if (!item->dst) {
+ if (check_refname_format(item->src, flags))
+ return 0;
+ } else if (!*item->dst) {
+ return 0;
+ } else {
+ if (check_refname_format(item->dst, flags))
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+void refspec_item_init(struct refspec_item *item, const char *refspec, int fetch)
+{
+ memset(item, 0, sizeof(*item));
+
+ if (!parse_refspec(item, refspec, fetch))
+ die("Invalid refspec '%s'", refspec);
+}
+
+void refspec_item_clear(struct refspec_item *item)
+{
+ FREE_AND_NULL(item->src);
+ FREE_AND_NULL(item->dst);
+ item->force = 0;
+ item->pattern = 0;
+ item->matching = 0;
+ item->exact_sha1 = 0;
+}
+
+void refspec_init(struct refspec *rs, int fetch)
+{
+ memset(rs, 0, sizeof(*rs));
+ rs->fetch = fetch;
+}
+
+void refspec_append(struct refspec *rs, const char *refspec)
+{
+ struct refspec_item item;
+
+ refspec_item_init(&item, refspec, rs->fetch);
+
+ ALLOC_GROW(rs->items, rs->nr + 1, rs->alloc);
+ rs->items[rs->nr++] = item;
+
+ ALLOC_GROW(rs->raw, rs->raw_nr + 1, rs->raw_alloc);
+ rs->raw[rs->raw_nr++] = xstrdup(refspec);
+}
+
+void refspec_appendn(struct refspec *rs, const char **refspecs, int nr)
+{
+ int i;
+ for (i = 0; i < nr; i++)
+ refspec_append(rs, refspecs[i]);
+}
+
+void refspec_clear(struct refspec *rs)
+{
+ int i;
+
+ for (i = 0; i < rs->nr; i++)
+ refspec_item_clear(&rs->items[i]);
+
+ FREE_AND_NULL(rs->items);
+ rs->alloc = 0;
+ rs->nr = 0;
+
+ for (i = 0; i < rs->raw_nr; i++)
+ free((char *)rs->raw[i]);
+ FREE_AND_NULL(rs->raw);
+ rs->raw_alloc = 0;
+ rs->raw_nr = 0;
+
+ rs->fetch = 0;
+}
+
+int valid_fetch_refspec(const char *fetch_refspec_str)
+{
+ struct refspec_item refspec;
+ int ret = parse_refspec(&refspec, fetch_refspec_str, REFSPEC_FETCH);
+ refspec_item_clear(&refspec);
+ return ret;
+}
+
+void refspec_ref_prefixes(const struct refspec *rs,
+ struct argv_array *ref_prefixes)
+{
+ int i;
+ for (i = 0; i < rs->nr; i++) {
+ const struct refspec_item *item = &rs->items[i];
+ const char *prefix = NULL;
+
+ if (item->exact_sha1)
+ continue;
+ if (rs->fetch == REFSPEC_FETCH)
+ prefix = item->src;
+ else if (item->dst)
+ prefix = item->dst;
+ else if (item->src && !item->exact_sha1)
+ prefix = item->src;
+
+ if (prefix) {
+ if (item->pattern) {
+ const char *glob = strchr(prefix, '*');
+ argv_array_pushf(ref_prefixes, "%.*s",
+ (int)(glob - prefix),
+ prefix);
+ } else {
+ expand_ref_prefix(ref_prefixes, prefix);
+ }
+ }
+ }
+}