btrfs-progs: tests/mkfs: Introduce test case to check if mkfs rootdir can create...

To test regression 460e93f25754 ("btrfs-progs: mkfs: check the status of
file at mkfs").

Signed-off-by: Qu Wenruo <wqu@suse.com>
[ update test to create a out of /tmp ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/tests/mkfs-tests/011-rootdir-create-file/test.sh b/tests/mkfs-tests/011-rootdir-create-file/test.sh
new file mode 100755 (executable)
index 0000000..c04f711
--- /dev/null
+++ b/tests/mkfs-tests/011-rootdir-create-file/test.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# Regression test for mkfs.btrfs --rootdir on non-existent file.
+# Expected behavior: it should create a new file if destination doesn't exist
+# Regression 460e93f25754 ("btrfs-progs: mkfs: check the status of file at mkfs")
+
+source "$TOP/tests/common"
+
+check_prereq mkfs.btrfs
+
+tmp=$(mktemp -d --tmpdir btrfs-progs-mkfs.rootdirXXXXXXX)
+# we can't use TEST_DEV, a file is needed
+img=$(mktemp btrfs-progs-mkfs.rootdirXXXXXXX)
+run_check "$TOP/mkfs.btrfs" -f --rootdir "$TOP/Documentation/" "$img"
+
+rm -rf -- "$img"