btrfs-progs: tests: Add test case for mkfs --rootdir parameter

Add test case which checks if -r|--rootdir mkfs option can handle
symlink/char/block/fifo files.

Signed-off-by: Qu Wenruo <quwenruo.btrfs@gmx.com>
Signed-off-by: David Sterba <dsterba@suse.com>

tests/mkfs-tests/009-special-files-for-rootdir/test.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+# Check if --rootdir can handle special files (socket/fifo/char/block) correctly
+#
+# --rootdir had a problem of filling dir items/indexes with wrong type
+# and caused btrfs check to report such error
+#
+# Note: sock type is skipped in this test
+
+source "$TOP/tests/common"
+
+check_prereq mkfs.btrfs
+check_prereq btrfs
+
+setup_root_helper		# For mknod
+prepare_test_dev
+
+# mknod can create FIFO/CHAR/BLOCK file but not SOCK.
+# No neat tool to create socket file, unless using python or similar.
+# So no SOCK is tested here
+check_global_prereq mknod
+check_global_prereq dd
+
+tmp=$(mktemp -d --tmpdir btrfs-progs-mkfs.rootdirXXXXXXX)
+
+run_check mkdir "$tmp/dir"
+run_check mkdir -p "$tmp/dir/in/dir"
+run_check mknod "$tmp/fifo" p
+run_check $SUDO_HELPER mknod "$tmp/char" c 1 1
+run_check $SUDO_HELPER mknod "$tmp/block" b 1 1
+run_check dd if=/dev/zero bs=1M count=1 of="$tmp/regular"
+
+run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f -r "$tmp" "$TEST_DEV"
+
+rm -rf -- "$tmp"
+
+run_check $SUDO_HELPER "$TOP/btrfs" check "$TEST_DEV"