Ship mdadm-shutdown.service and suggest dracut-core.

Users of systemd with rootfs on Intel Matrix Raid and DDF external
metadata-raid arrays that require mdmon monitoring, may wish to
install dracut-core package and enable mdadm-shutdown.service. This
will create a shutdown initramfs, that systemd-shutdown can pivot
to. This may result in an improved shutdown behaviour with less hangs
and synced raid arrays. The generated initramfs will takeover mdmon
monitoring, wait for the arrays to be clean before stopping them and
unmounting everything and finally executing requested shutdown
command.

4 files changed, 36 insertions, 1 deletions

diff --git a/debian/changelog b/debian/changelog
index 7dad63ad..566a9a04 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,17 @@
+mdadm (4.0-2) unstable; urgency=medium
+
+  * Ship mdadm-shutdown.service and suggest dracut-core. Users of systemd
+    with rootfs on Intel Matrix Raid and DDF external metadata-raid arrays
+    that require mdmon monitoring, may wish to install dracut-core package
+    and enable mdadm-shutdown.service. This will create a shutdown
+    initramfs, that systemd-shutdown can pivot to. This may result in an
+    improved shutdown behaviour with less hangs and synced raid
+    arrays. The generated initramfs will takeover mdmon monitoring, wait
+    for the arrays to be clean before stopping them and unmounting
+    everything and finally executing requested shutdown command.
+
+ -- Dimitri John Ledkov <xnox@ubuntu.com>  Tue, 10 Oct 2017 11:55:52 +0100
+
 mdadm (4.0-1) unstable; urgency=medium
 
   * New upstream release. LP: #1668128
diff --git a/debian/control b/debian/control
index df66b9ad..41dfdc8d 100644
--- a/debian/control
+++ b/debian/control
@@ -13,7 +13,7 @@ Package: mdadm
 Architecture: linux-any
 Depends: ${shlibs:Depends}, udev, ${misc:Depends}, lsb-base, debconf
 Recommends: ${mta:Recommends}, kmod | module-init-tools
-Suggests: ${mta:Suggests}
+Suggests: ${mta:Suggests}, dracut-core
 Description: tool to administer Linux MD arrays (software RAID)
  The mdadm utility can be used to create, manage, and monitor MD
  (multi-disk) arrays for software RAID or multipath I/O.
diff --git a/debian/mdadm-shutdown.service b/debian/mdadm-shutdown.service
new file mode 100644
index 00000000..59762c8f
--- /dev/null
+++ b/debian/mdadm-shutdown.service
@@ -0,0 +1,20 @@
+[Unit]
+Description=Prepare mdadm shutdown initramfs
+ConditionFileIsExecutable=/usr/bin/dracut
+After=local-fs.target boot.mount boot.automount
+Wants=local-fs.target
+Conflicts=shutdown.target umount.target
+DefaultDependencies=no
+
+[Service]
+RemainAfterExit=yes
+Type=oneshot
+ExecStart=/bin/true
+ExecStop=/bin/mount -o remount,exec,suid /run
+ExecStop=/bin/mkdir -p /run/initramfs
+ExecStop=/usr/bin/dracut --no-compress --no-kernel --quiet --force --force-add "shutdown mdraid" --omit "caps" /run/initramfs/shutdown.cpio
+ExecStop=/bin/sh -c 'cd /run/initramfs; cpio -id --quiet < shutdown.cpio'
+ExecStop=/bin/rm /run/initramfs/shutdown.cpio
+
+[Install]
+WantedBy=sysinit.target
diff --git a/debian/rules b/debian/rules
index 1ed970a9..b13f218a 100755
--- a/debian/rules
+++ b/debian/rules
@@ -67,6 +67,7 @@ install-arch: build-arch
 	install -Dm0755 udeb/mdadm $(DESTDIR_UDEB)/sbin/mdadm
 	install -Dm0755 udeb/mdmon $(DESTDIR_UDEB)/sbin/mdmon
 	install -Dm0644 udev-md-raid-arrays.rules $(DESTDIR_UDEB)/lib/udev/rules.d/63-md-raid-arrays.rules
+	install -Dm0644 debian/mdadm-shutdown.service $(DESTDIR)/lib/systemd/system/mdadm-shutdown.service
 ifeq ($(shell dpkg-vendor --derives-from Ubuntu && echo yes), yes)
 	install -Dm0644 udev-md-raid-assembly.rules $(DESTDIR_UDEB)/lib/udev/rules.d/64-md-raid-assembly.rules
 	install -Dm0644 debian/source_mdadm.py $(DESTDIR)/usr/share/apport/package-hooks/source_mdadm.py