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#!/bin/sh
#
# mkconf -- outputs valid mdadm.conf contents for the local system
#
# Copyright © martin f. krafft <madduck@madduck.net>
# distributed under the terms of the Artistic Licence 2.0
#
# $Id$
#
set -eu
ME="${0##*/}"
MDADM=/sbin/mdadm
DEBIANCONFIG=/etc/default/mdadm
CONFIG=/etc/mdadm/mdadm.conf
test -r $DEBIANCONFIG && . $DEBIANCONFIG
if [ -n "${MDADM_MAILADDR__:-}" ]; then
# honour MAILADDR from the environment (from postinst)
MAILADDR="$MDADM_MAILADDR__"
else
# preserve existing MAILADDR
MAILADDR="$(sed -ne 's,MAILADDR ,,p' $CONFIG 2>/dev/null || echo root)"
fi
generate=0
[ "${1:-}" = force-generate ] && rm -f $CONFIG
case "${1:-}" in
generate|force-generate)
[ -n "${2:-}" ] && CONFIG=$2
# only barf if the config file specifies anything else than MAILADDR
if egrep -qv '^(MAILADDR.*|#.*|)$' $CONFIG 2>/dev/null; then
echo "E: $ME: $CONFIG already exists." >&2
exit -1
fi
mkdir --parent ${CONFIG%/*}
exec >$CONFIG
generate=1
;;
esac
cat <<_eof
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
DEVICE partitions
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR $MAILADDR
_eof
error=0
if [ ! -r /proc/mdstat ]; then
echo W: $ME: MD subsystem is not loaded, thus I cannot scan for arrays. >&2
error=1
elif [ ! -r /proc/partitions ]; then
echo W: $ME: /proc/partitions cannot be read, thus I cannot scan for arrays. >&2
error=2
else
echo "# definitions of existing MD arrays"
if ! $MDADM --examine --scan --config=partitions; then
error=$(($? + 128))
echo W: $ME: failed to scan for partitions. >&2
echo "### WARNING: scan failed."
else
echo
fi
fi
if [ $generate -eq 1 ]; then
cat <<_eof
# This file was auto-generated on $(date -R)
# by mkconf \$Id$
_eof
mkdir -p /var/lib/mdadm
md5sum $CONFIG > /var/lib/mdadm/mdadm.conf-generated
fi
exit $error
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