add_ref(): verify that the refname is formatted correctly

In add_ref(), verify that the refname is formatted correctly before
adding it to the ref_list.  Here we have to allow refname components
that start with ".", since (for example) the remote protocol uses
synthetic reference name ".have".  So add a new REFNAME_DOT_COMPONENT
flag that can be passed to check_refname_format() to allow leading
dots.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/refs.h b/refs.h
index b0da5fc95..d5ac13333 100644
--- a/refs.h
+++ b/refs.h
@@ -99,6 +99,7 @@ extern int for_each_reflog(each_ref_fn, void *);
 
 #define REFNAME_ALLOW_ONELEVEL 1
 #define REFNAME_REFSPEC_PATTERN 2
+#define REFNAME_DOT_COMPONENT 4
 
 /*
  * Return 0 iff ref has the correct format for a refname according to
@@ -106,7 +107,10 @@ extern int for_each_reflog(each_ref_fn, void *);
  * REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
  * reference names.  If REFNAME_REFSPEC_PATTERN is set in flags, then
  * allow a "*" wildcard character in place of one of the name
- * components.  No leading or repeated slashes are accepted.
+ * components.  No leading or repeated slashes are accepted.  If
+ * REFNAME_DOT_COMPONENT is set in flags, then allow refname
+ * components to start with "." (but not a whole component equal to
+ * "." or "..").
  */
 extern int check_refname_format(const char *ref, int flags);