Add mdmonitor.service systemd unit file.

This systemd unit file runs mdadm in --monitor mode.
It is started by a SYSTEMD_WANTS signal from udev whenever
an md array is started that would benefit from mdadm --monitor.

Commandline arguments can be provided by a script
  /usr/lib/systemd/scripts/mdadm_env.sh
which should write an
  MDADM_MONITOR_ARGS=....
line to /run/sysconfig/mdadm

A script to extra args from SUSE's /etc/sysconfig/mdadm file
is provided.
If no mdadm_env.sh is provided, then args are "--scan" which
requires "mail" or "program" to be set in /etc/mdadm.conf.
I believe this is suitable for Fedora.

Signed-off-by: NeilBrown <neilb@suse.de>

2 files changed, 61 insertions, 0 deletions

diff --git a/systemd/SUSE-mdadm_env.sh b/systemd/SUSE-mdadm_env.sh
new file mode 100644
index 00000000..10b2e749
--- /dev/null
+++ b/systemd/SUSE-mdadm_env.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# extract configuration from /etc/sysconfig/mdadm and write
+# environment to /run/sysconfig/mdadm to be used by
+# systemd unit files.
+
+MDADM_SCAN="yes"
+
+# Following adapted from /etc/init.d/mdadmd on openSUSE
+
+mdadmd_CONFIG=/etc/sysconfig/mdadm
+if test -r $mdadmd_CONFIG; then
+   . $mdadmd_CONFIG
+fi
+
+if [ x$MDADM_DELAY != x"" ]; then
+  MDADM_DELAY="-d "$MDADM_DELAY;
+fi
+
+if [ x$MDADM_MAIL != x"" ]; then
+  MDADM_MAIL="-m \"$MDADM_MAIL\""
+fi
+
+if [ x$MDADM_PROGRAM != x"" ]; then
+  MDADM_PROGRAM="-p \"$MDADM_PROGRAM\""
+fi
+
+if [ x$MDADM_SCAN = x"yes" ]; then
+  MDADM_SCAN="--scan"
+else
+  MDADM_SCAN=""
+fi
+
+if [ x$MDADM_SEND_MAIL_ON_START = x"yes" ]; then
+  MDADM_SEND_MAIL="-t"
+else
+  MDADM_SEND_MAIL=""
+fi
+
+if [ x$MDADM_CONFIG != x"" ]; then
+  MDADM_CONFIG="-c \"$MDADM_CONFIG\""
+fi
+
+mkdir -p /run/sysconfig
+echo "MDADM_MONITOR_ARGS=$MDADM_RAIDDEVICES $MDADM_DELAY $MDADM_MAIL $MDADM_PROGRAM $MDADM_SCAN $MDADM_SEND_MAIL $MDADM_CONFIG" > /run/sysconfig/mdadm
diff --git a/systemd/mdmonitor.service b/systemd/mdmonitor.service
new file mode 100644
index 00000000..11aaeff2
--- /dev/null
+++ b/systemd/mdmonitor.service
@@ -0,0 +1,16 @@
+#  This file is part of mdadm.
+#
+#  mdadm 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.
+
+[Unit]
+Description=MD array monitor
+DefaultDependencies=no
+
+[Service]
+Environment=  MDADM_MONITOR_ARGS=--scan
+EnvironmentFile=-/run/sysconfig/mdadm
+ExecStartPre=-/usr/lib/systemd/scripts/mdadm_env.sh
+ExecStart=/sbin/mdadm --monitor $MDADM_MONITOR_ARGS