Merge branch 'maint'

[git.git] / builtin-checkout.c

diff --git a/builtin-checkout.c b/builtin-checkout.c
index 9377a1c71ea8571d3e36e9e19aa322db765e93c8..4497b7092d0e88aa731c64c0f22bf0d05ead0411 100644 (file)
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -580,6 +580,18 @@ no_reference:
                return checkout_paths(source_tree, pathspec);
        }
 
+       if (opts.new_branch) {
+               struct strbuf buf;
+               strbuf_init(&buf, 0);
+               strbuf_addstr(&buf, "refs/heads/");
+               strbuf_addstr(&buf, 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);
+       }
+
        if (new.name && !new.commit) {
                die("Cannot switch branch to a non-commit.");
        }