Merge branch 'jc/name-branch'

* jc/name-branch:
  Don't permit ref/branch names to end with ".lock"
  check_ref_format(): tighten refname rules
  strbuf_check_branch_ref(): a helper to check a refname for a branch
  Fix branch -m @{-1} newname
  check-ref-format --branch: give Porcelain a way to grok branch shorthand
  strbuf_branchname(): a wrapper for branch name shorthands
  Rename interpret/substitute nth_last_branch functions

Conflicts:
	Documentation/git-check-ref-format.txt

1 files changed, 6 insertions, 12 deletions

diff --git a/builtin-checkout.c b/builtin-checkout.c
index fc55bbe14..33d1fecb6 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -353,16 +353,11 @@ struct branch_info {
 static void setup_branch_path(struct branch_info *branch)
 {
 	struct strbuf buf = STRBUF_INIT;
-	int ret;
 
-	if ((ret = interpret_nth_last_branch(branch->name, &buf))
-	    && ret == strlen(branch->name)) {
+	strbuf_branchname(&buf, branch->name);
+	if (strcmp(buf.buf, branch->name))
 		branch->name = xstrdup(buf.buf);
-		strbuf_splice(&buf, 0, 0, "refs/heads/", 11);
-	} else {
-		strbuf_addstr(&buf, "refs/heads/");
-		strbuf_addstr(&buf, branch->name);
-	}
+	strbuf_splice(&buf, 0, 0, "refs/heads/", 11);
 	branch->path = strbuf_detach(&buf, NULL);
 }
 
@@ -738,12 +733,11 @@ no_reference:
 
 	if (opts.new_branch) {
 		struct strbuf buf = STRBUF_INIT;
-		strbuf_addstr(&buf, "refs/heads/");
-		strbuf_addstr(&buf, opts.new_branch);
+		if (strbuf_check_branch_ref(&buf, opts.new_branch))
+			die("git checkout: we do not like '%s' as a branch name.",
+			    opts.new_branch);
 		if (!get_sha1(buf.buf, rev))
 			die("git checkout: branch %s already exists", opts.new_branch);
-		if (check_ref_format(buf.buf))
-			die("git checkout: we do not like '%s' as a branch name.", opts.new_branch);
 		strbuf_release(&buf);
 	}