tests: test --key for a real guest (with inspection)

Test both the decryption by device name, and UUID.

tests/luks/Makefile.am

@@ -20,7 +20,8 @@ include $(top_srcdir)/subdir-rules.mk
 TESTS = \
 	test-luks.sh \
 	test-luks-list.sh \
-	test-key-option.sh
+	test-key-option.sh \
+	test-key-option-inspect.sh
 
 TESTS_ENVIRONMENT = $(top_builddir)/run --test
 

tests/luks/test-key-option-inspect.sh

@@ -0,0 +1,48 @@
+#!/bin/bash -
+# libguestfs
+# Copyright (C) 2019 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 the --key option.  It is handled by common code so we only need
+# to test one tool (guestfish).
+
+set -e
+
+$TEST_FUNCTIONS
+skip_if_skipped
+skip_unless_feature_available luks
+skip_unless_phony_guest fedora-luks.img
+
+disk=../../test-data/phony-guests/fedora-luks.img
+device=/dev/sda2
+
+# Get the UUID of the LUKS device.
+uuid="$(guestfish --ro -a $disk run : luks-uuid $device)"
+
+# Try to decrypt the disk in different ways:
+# - pass a wrong key via stdin to check the --key value is actually used only
+# - check for /etc/fedora-release as a way to know the LUKS device was
+#   decrypted correctly
+
+# Specify the libguestfs device name of the LUKS device.
+echo wrongkey | guestfish --ro -a $disk -i --keys-from-stdin \
+          --key "$device:key:FEDORA" \
+          exists /etc/fedora-release
+
+# Specify the UUID of the LUKS device.
+echo wrongkey | guestfish --ro -a $disk -i --keys-from-stdin \
+          --key "$uuid:key:FEDORA" \
+          exists /etc/fedora-release