[PATCH 3/3] Btrfs-progs: add test for receive

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

Add a test for a scenario that used to fail due to find_mount_root()
incorrectly determining the mount point for the receive path due to the
fact that a different mount point with a path that is a prefix of the
receive path exists.

This is fixed by a recent patch titled:

  "Btrfs-progs: fix mount point detection due to partial prefix match"

Reported-by: David Disseldorp <ddis@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 .../034-receive-common-mount-point-prefix/test.sh  | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100755 tests/misc-tests/034-receive-common-mount-point-prefix/test.sh

diff --git a/tests/misc-tests/034-receive-common-mount-point-prefix/test.sh b/tests/misc-tests/034-receive-common-mount-point-prefix/test.sh
new file mode 100755
index 00000000..e2a6fdfc
--- /dev/null
+++ b/tests/misc-tests/034-receive-common-mount-point-prefix/test.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+# Test that receive determines the correct mount point path when there is
+# another mount point that matches the destination's path as a prefix.
+
+source "$TEST_TOP/common"
+
+check_prereq btrfs
+check_prereq mkfs.btrfs
+
+setup_root_helper
+
+rm -f dev1 dev2
+run_check truncate -s 1G dev1
+run_check truncate -s 1G dev2
+chmod a+w dev1 dev2
+
+loop1=$(run_check_stdout $SUDO_HELPER losetup --find --show dev1)
+loop2=$(run_check_stdout $SUDO_HELPER losetup --find --show dev2)
+
+run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$loop1"
+run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$loop2"
+
+run_check $SUDO_HELPER mount "$loop1" "$TEST_MNT"
+mkdir "${TEST_MNT}/ddis"
+mkdir "${TEST_MNT}/ddis-not-a-mount"
+run_check $SUDO_HELPER mount "$loop2" "${TEST_MNT}/ddis"
+
+echo "some data" > "${TEST_MNT}/ddis/file"
+
+run_check $SUDO_HELPER "$TOP/btrfs" subvolume snapshot -r \
+	  "${TEST_MNT}/ddis" "${TEST_MNT}/ddis/snap"
+
+rm -f send.data
+run_check $SUDO_HELPER "$TOP/btrfs" send -f send.data "${TEST_MNT}/ddis/snap"
+
+# The following receive used to fail because it incorrectly determined the mount
+# point of the destination path to be ${TEST_MNT}/ddis and not $TEST_MNT.
+run_check $SUDO_HELPER "$TOP/btrfs" receive -f send.data \
+	  "${TEST_MNT}/ddis-not-a-mount"
+
+run_check $SUDO_HELPER umount "${TEST_MNT}/ddis"
+run_check $SUDO_HELPER umount "$TEST_MNT"
+
+# Cleanup loop devices and send data.
+run_check $SUDO_HELPER losetup -d "$loop1"
+run_check $SUDO_HELPER losetup -d "$loop2"
+rm -f dev1 dev2 send.data
-- 
2.11.0