[lvm-devel] master - tests: add metadata-bad-mdaheader.sh

[David Teigland]

Gitweb:        https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=d7c1168c6ac66fec30ef21c0a59d00d0259ab126
Commit:        d7c1168c6ac66fec30ef21c0a59d00d0259ab126
Parent:        878741502a28c3e91d8fdff76ebcc83a68b04f91
Author:        David Teigland <teigland at redhat.com>
AuthorDate:    Tue May 28 15:20:30 2019 -0500
Committer:     David Teigland <teigland at redhat.com>
CommitterDate: Fri Jun 7 15:54:04 2019 -0500

tests: add metadata-bad-mdaheader.sh

needs xxd command
---
 test/shell/metadata-bad-mdaheader.sh |   80 ++++++++++++++++++++++++++++++++++
 1 files changed, 80 insertions(+), 0 deletions(-)

diff --git a/test/shell/metadata-bad-mdaheader.sh b/test/shell/metadata-bad-mdaheader.sh
new file mode 100644
index 0000000..cf24936
--- /dev/null
+++ b/test/shell/metadata-bad-mdaheader.sh
@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2008-2013,2018 Red Hat, Inc. All rights reserved.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# 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
+
+. lib/inittest
+
+aux prepare_devs 3
+get_devs
+
+#
+# Test corrupted mda_header.version field, which also
+# causes the mda_header checksum to be bad.
+#
+# FIXME: if a VG has only a single PV, this repair
+# doesn't work since there's no good PV to get
+# metadata from.  A more advanced repair capability
+# is needed.
+#
+
+dd if=/dev/zero of="$dev1" || true
+dd if=/dev/zero of="$dev2" || true
+dd if=/dev/zero of="$dev3" || true
+
+vgcreate $SHARED $vg "$dev1" "$dev2" "$dev3"
+
+pvs
+
+if [ -e "/usr/bin/xxd" ]; then
+
+# read mda_header which is 4k from start of disk
+dd if="$dev1" of=meta1 bs=4k count=1 skip=1
+
+# convert binary to text
+xxd meta1 > meta1.txt
+
+# Corrupt mda_header by changing the version field from 0100 to 0200
+sed 's/0000010:\ 304e\ 2a3e\ 0100\ 0000\ 0010\ 0000\ 0000\ 0000/0000010:\ 304e\ 2a3e\ 0200\ 0000\ 0010\ 0000\ 0000\ 0000/' meta1.txt > meta1-bad.txt
+
+# convert text to binary
+xxd -r meta1-bad.txt > meta1-bad
+
+# write bad mda_header back to disk
+dd if=meta1-bad of="$dev1" bs=4k seek=1
+
+# pvs reports bad metadata header
+pvs 2>&1 | tee out
+grep "bad metadata header" out
+
+fi
+
+pvs "$dev1"
+pvs "$dev2"
+pvs "$dev3"
+
+# bad metadata in one mda doesn't prevent using
+# the VG since other mdas are fine and usable
+lvcreate -l1 $vg
+
+
+vgck --updatemetadata $vg
+
+pvs 2>&1 | tee out
+not grep "bad metadata header" out
+
+pvs "$dev1"
+pvs "$dev2"
+pvs "$dev3"
+
+vgchange -an $vg
+vgremove -ff $vg
+
+