tests: md: test guestfish finds md and LV devices in different combinations

Test guestfish finds:
1. md device created from physical block device and LV,
2. md device created from LVs
3. LV created on md device

raid0 is used for md device because it is inoperable if one of its components is inaccessible so it is easy observable that md device is missing (raid1 in this case will be operable but in degraded state).

tests/md/Makefile.am

@@ -23,6 +23,7 @@ TESTS = \
 	test-list-filesystems.sh \
 	test-list-md-devices.sh \
 	test-lvm-on-md-device.sh \
+	test-md-and-lvm-devices.sh \
 	test-mdadm.sh
 
 TESTS_ENVIRONMENT = $(top_builddir)/run --test

tests/md/test-md-and-lvm-devices.sh

@@ -0,0 +1,142 @@
+#!/bin/bash -
+# libguestfs
+# Copyright (C) 2018 Red Hat Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+# Test guestfish finds:
+# 1. md device created from physical block device and LV,
+# 2. md device created from LVs
+# 3. LV created on md device
+#
+# raid0 is used for md device because it is inoperable if one of its components
+# is inaccessible so it is easy observable that md device is missing (raid1 in
+# this case will be operable but in degraded state).
+
+set -e
+
+$TEST_FUNCTIONS
+skip_if_skipped
+
+disk1=md-and-lvm-devices-1.img
+disk2=md-and-lvm-devices-2.img
+
+rm -f $disk1 $disk2
+
+# Clean up if the script is killed or exits early
+cleanup ()
+{
+    status=$?
+    set +e
+
+    # Don't delete the output files if non-zero exit
+    if [ "$status" -eq 0 ]; then rm -f $disk1 $disk2; fi
+
+    exit $status
+}
+trap cleanup INT QUIT TERM EXIT
+
+# Create 2 disks partitioned as:
+# sda1: 20M MD (md127)
+# sda2: 20M PV (vg1)
+# sda3: 20M MD (md125)
+#
+# sdb1: 20M PV (vg0)
+# sdb2: 20M PV (vg2)
+# sdb3: 20M MD (md125)
+#
+# lv0   : LV (vg0)
+# lv1   : LV (vg1)
+# lv2   : LV (vg2)
+# md127 : md (sda1, lv0)
+# md126 : md (lv1, lv2)
+# md125 : md (sda3, sdb3)
+# vg3   : VG (md125)
+# lv3   : LV (vg3)
+#
+
+guestfish <<EOF
+# Add 2 empty disks
+sparse $disk1 100M
+sparse $disk2 100M
+run
+
+# Partition disks
+part-init /dev/sda mbr
+part-add /dev/sda p 64 41023
+part-add /dev/sda p 41024 81983
+part-add /dev/sda p 81984 122943
+part-init /dev/sdb mbr
+part-add /dev/sdb p 64 41023
+part-add /dev/sdb p 41024 81983
+part-add /dev/sdb p 81984 122943
+
+# Create volume group and logical volume on sdb1
+pvcreate /dev/sdb1
+vgcreate vg0 /dev/sdb1
+lvcreate-free lv0 vg0 100
+
+# Create md from sda1 and vg0/lv0
+md-create md-sda1-lv0 "/dev/sda1 /dev/vg0/lv0" level:raid0
+
+# Create volume group and logical volume on sda2
+pvcreate /dev/sda2
+vgcreate vg1 /dev/sda2
+lvcreate-free lv1 vg1 100
+
+# Create volume group and logical volume on sdb2
+pvcreate /dev/sdb2
+vgcreate vg2 /dev/sdb2
+lvcreate-free lv2 vg2 100
+
+# Create md from vg1/lv1 and vg2/lv2
+md-create md-lv1-lv2 "/dev/vg1/lv1 /dev/vg2/lv2" level:raid0
+
+# Create md from sda3 and sdb3
+md-create md-sda3-sdb3 "/dev/sda3 /dev/sdb3" level:raid0
+
+# Create volume group and logical volume on md125 (last created md)
+pvcreate /dev/md125
+vgcreate vg3 /dev/md125
+lvcreate-free lv3 vg3 100
+EOF
+
+# Ensure list-md-devices now returns all created md devices
+# and lvs returns all created logical volumes.
+output=$(
+guestfish --format=raw -a $disk1 --format=raw -a $disk2 <<EOF
+run
+list-md-devices
+lvs
+EOF
+)
+
+expected="/dev/md125
+/dev/md126
+/dev/md127
+/dev/vg0/lv0
+/dev/vg1/lv1
+/dev/vg2/lv2
+/dev/vg3/lv3"
+
+if [ "$output" != "$expected" ]; then
+    echo "$0: error: actual output did not match expected output"
+    echo -e "actual:\n$output"
+    echo -e "expected:\n$expected"
+    exit 1
+fi
+
+# cleanup() is called implicitly which cleans up everything
+exit 0