Merge branch 'master' into lj/refs

* master: (99 commits)
  lock_ref_sha1_basic does not remove empty directories on BSD
  git-push: .git/remotes/ file does not require SP after colon
  git-mv: invalidate the removed path properly in cache-tree
  Makefile: install and clean merge-recur, still.
  GIT 1.4.3-rc1
  gitweb: tree view: hash_base and hash are now context sensitive
  git-diff -B output fix.
  fetch: Reset remote refs list each time fetch_main is called
  Remove -fPIC which was only needed for Git.xs
  Fix approxidate() to understand 12:34 AM/PM are 00:34 and 12:34
  git-diff -B output fix.
  Make cvsexportcommit remove files.
  diff --stat: ensure at least one '-' for deletions, and one '+' for additions
  diff --stat=width[,name-width]: allow custom diffstat output width.
  gitweb: History: blob and tree are first, then commitdiff, etc
  gitweb: Remove redundant "commit" from history
  http/ftp: optionally ask curl to not use EPSV command
  gitweb: Don't use quotemeta on internally generated strings
  gitweb: Add snapshot to shortlog
  gitweb: Factor out gitweb_have_snapshot()
  ...

refs.c

@@ -234,6 +234,12 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
 			}
 		}
 
+		/* Is it a directory? */
+		if (S_ISDIR(st.st_mode)) {
+			errno = EISDIR;
+			return NULL;
+		}
+
 		/*
 		 * Anything else, just open it and try to use it as
 		 * a ref