Fix checkout of index-only dirs and prefixed paths

There are a couple of checkout bugs fixed here.  One is with
untracked working directory entries that are prefixes of tree
entries but not in a meaningful way (i.e. "read" is a prefix of
"readme.txt" but doesn't interfere in any way).  The second bug
is actually a redo of 07edfa0fc640f85f95507c3101e77accd7d2bf0d
where directory entries in the index that are not in the diff
were not being removed correctly.  That fix remedied one case
but broke another.

1 files changed, 25 insertions, 0 deletions

diff --git a/tests-clar/checkout/index.c b/tests-clar/checkout/index.c
index b1778a422..fe1f6874f 100644
--- a/tests-clar/checkout/index.c
+++ b/tests-clar/checkout/index.c
@@ -496,3 +496,28 @@ void test_checkout_index__validates_struct_version(void)
 	err = giterr_last();
 	cl_assert_equal_i(err->klass, GITERR_INVALID);
 }
+
+void test_checkout_index__can_update_prefixed_files(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	cl_git_mkfile("./testrepo/READ", "content\n");
+	cl_git_mkfile("./testrepo/README.after", "content\n");
+	cl_git_pass(p_mkdir("./testrepo/branch_file", 0777));
+	cl_git_pass(p_mkdir("./testrepo/branch_file/contained_dir", 0777));
+	cl_git_mkfile("./testrepo/branch_file/contained_file", "content\n");
+	cl_git_pass(p_mkdir("./testrepo/branch_file.txt.after", 0777));
+
+	opts.checkout_strategy = GIT_CHECKOUT_FORCE | GIT_CHECKOUT_REMOVE_UNTRACKED;
+
+	cl_git_pass(git_checkout_index(g_repo, NULL, &opts));
+
+	test_file_contents("./testrepo/README", "hey there\n");
+	test_file_contents("./testrepo/branch_file.txt", "hi\nbye!\n");
+	test_file_contents("./testrepo/new.txt", "my new file\n");
+
+	cl_assert(!git_path_exists("testrepo/READ"));
+	cl_assert(!git_path_exists("testrepo/README.after"));
+	cl_assert(!git_path_exists("testrepo/branch_file"));
+	cl_assert(!git_path_exists("testrepo/branch_file.txt.after"));
+}