[PATCH 3/3] checkout: fix ambiguity check in subdir

[Nguyễn Thái Ngọc Duy]

The two functions in parse_branchname_arg(), verify_non_filename and
check_filename, need correct prefix in order to reconstruct the paths
and check for their existence. With NULL prefix, they just check paths
at top dir instead.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 builtin/checkout.c            |  4 ++--
 t/t2010-checkout-ambiguous.sh |  9 +++++++++
 t/t2024-checkout-dwim.sh      | 12 ++++++++++++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 1f71d06..53c7284 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -985,7 +985,7 @@ static int parse_branchname_arg(int argc, const char **argv,
                int recover_with_dwim = dwim_new_local_branch_ok;
 
                if (!has_dash_dash &&
-                   (check_filename(NULL, arg) || !no_wildcard(arg)))
+                   (check_filename(opts->prefix, arg) || !no_wildcard(arg)))
                        recover_with_dwim = 0;
                /*
                 * Accept "git checkout foo" and "git checkout foo --"
@@ -1046,7 +1046,7 @@ static int parse_branchname_arg(int argc, const char 
**argv,
                 * it would be extremely annoying.
                 */
                if (argc)
-                       verify_non_filename(NULL, arg);
+                       verify_non_filename(opts->prefix, arg);
        } else {
                argcount++;
                argv++;
diff --git a/t/t2010-checkout-ambiguous.sh b/t/t2010-checkout-ambiguous.sh
index e76e84a..2e47fe0 100755
--- a/t/t2010-checkout-ambiguous.sh
+++ b/t/t2010-checkout-ambiguous.sh
@@ -41,6 +41,15 @@ test_expect_success 'check ambiguity' '
        test_must_fail git checkout world all
 '
 
+test_expect_success 'check ambiguity in subdir' '
+       mkdir sub &&
+       # not ambiguous because sub/world does not exist
+       git -C sub checkout world ../all &&
+       echo hello >sub/world &&
+       # ambiguous because sub/world does exist
+       test_must_fail git -C sub checkout world ../all
+'
+
 test_expect_success 'disambiguate checking out from a tree-ish' '
        echo bye > world &&
        git checkout world -- world &&
diff --git a/t/t2024-checkout-dwim.sh b/t/t2024-checkout-dwim.sh
index 468a000..3e5ac81 100755
--- a/t/t2024-checkout-dwim.sh
+++ b/t/t2024-checkout-dwim.sh
@@ -174,6 +174,18 @@ test_expect_success 'checkout of branch with a file having 
the same name fails'
        test_branch master
 '
 
+test_expect_success 'checkout of branch with a file in subdir having the same 
name fails' '
+       git checkout -B master &&
+       test_might_fail git branch -D spam &&
+
+       >spam &&
+       mkdir sub &&
+       mv spam sub/spam &&
+       test_must_fail git -C sub checkout spam &&
+       test_must_fail git rev-parse --verify refs/heads/spam &&
+       test_branch master
+'
+
 test_expect_success 'checkout <branch> -- succeeds, even if a file with the 
same name exists' '
        git checkout -B master &&
        test_might_fail git branch -D spam &&
-- 
2.8.2.524.g6ff3d78