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-rw-r--r--builtin/checkout.c19
-rwxr-xr-xt/t2015-checkout-unborn.sh11
2 files changed, 29 insertions, 1 deletions
diff --git a/builtin/checkout.c b/builtin/checkout.c
index f1984d9..a76aa2a 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -922,6 +922,17 @@ static int parse_branchname_arg(int argc, const char **argv,
return argcount;
}
+static int switch_unborn_to_new_branch(struct checkout_opts *opts)
+{
+ int status;
+ struct strbuf branch_ref = STRBUF_INIT;
+
+ strbuf_addf(&branch_ref, "refs/heads/%s", opts->new_branch);
+ status = create_symref("HEAD", branch_ref.buf, "checkout -b");
+ strbuf_release(&branch_ref);
+ return status;
+}
+
int cmd_checkout(int argc, const char **argv, const char *prefix)
{
struct checkout_opts opts;
@@ -1093,5 +1104,13 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
if (opts.writeout_stage)
die(_("--ours/--theirs is incompatible with switching branches."));
+ if (!new.commit) {
+ unsigned char rev[20];
+ int flag;
+
+ if (!read_ref_full("HEAD", rev, 0, &flag) &&
+ (flag & REF_ISSYMREF) && is_null_sha1(rev))
+ return switch_unborn_to_new_branch(&opts);
+ }
return switch_branches(&opts, &new);
}
diff --git a/t/t2015-checkout-unborn.sh b/t/t2015-checkout-unborn.sh
index c551d39..6352b74 100755
--- a/t/t2015-checkout-unborn.sh
+++ b/t/t2015-checkout-unborn.sh
@@ -1,6 +1,6 @@
#!/bin/sh
-test_description='checkout from unborn branch protects contents'
+test_description='checkout from unborn branch'
. ./test-lib.sh
test_expect_success 'setup' '
@@ -37,4 +37,13 @@ test_expect_success 'checkout from unborn merges identical index contents' '
git checkout -b new origin
'
+test_expect_success 'checking out another branch from unborn state' '
+ git checkout --orphan newroot &&
+ git checkout -b anothername &&
+ test_must_fail git show-ref --verify refs/heads/newroot &&
+ git symbolic-ref HEAD >actual &&
+ echo refs/heads/anothername >expect &&
+ test_cmp expect actual
+'
+
test_done