path: root/builtin
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authorJunio C Hamano <>2011-06-06 05:17:04 (GMT)
committerJunio C Hamano <>2011-06-06 05:17:04 (GMT)
commitc17b229454ac3f5d20fd0cff3a663b03c13cb38e (patch)
treef6b58684601a2da3bc6cf802ce764f072dd5c932 /builtin
parent02ac98374eefbe4a46d4b53a8a78057ad8ad39b7 (diff)
checkout -b <name>: correctly detect existing branch
When create a new branch, we fed "refs/heads/<proposed name>" as a string to get_sha1() and expected it to fail when a branch already exists. The right way to check if a ref exists is to check with resolve_ref(). A naïve solution that might appear attractive but does not work is to forbid slashes in get_describe_name() but that will not work. A describe name is is in the form of "ANYTHING-g<short sha1>", and that ANYTHING part comes from a original tag name used in the repository the user ran the describe command. A sick user could have a confusing hierarchical tag whose name is "refs/heads/foobar" (stored as refs/tags/refs/heads/foobar") to generate a describe name "refs/heads/foobar-6-g02ac983", and we should be able to use that name to refer to the object whose name is 02ac983. Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'builtin')
1 files changed, 1 insertions, 1 deletions
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 4ad7427..88708d4 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -874,7 +874,7 @@ no_reference:
if (strbuf_check_branch_ref(&buf, opts.new_branch))
die("git checkout: we do not like '%s' as a branch name.",
- if (!get_sha1(buf.buf, rev)) {
+ if (ref_exists(buf.buf)) {
opts.branch_exists = 1;
if (!opts.new_branch_force)
die("git checkout: branch %s already exists",