[dm-devel] [PATCH] multipathd.service: add dependency on systemd-udevd-kernel.socket

[mwilck at suse.com]

From: Martin Wilck <mwilck at suse.com>

Since f42d918 ("multipathd: Remove dependency on
systemd-udev-settle.service"), multipathd has no dependencies on
udev any more. In reality, multipathd depends quite heavily on udev.

multipathd startup succeeds indeed if udevd isn't running. Connecting to the
udev monitor netlink socket works, too, and if udevd is started later on,
multipathd will receive events over this socket. multipathd doesn't connect to
the udev control socket, but it does attempt to trigger uevents using
sysfs. For these events to be processed, the udev kernel socket must be
listening. For that, it's sufficient to depend on systemd-udevd-kernel.socket,
which will start udevd on demand if it isn't running.

Signed-off-by: Martin Wilck <mwilck at suse.com>

---
Note: I'd like to get this merged into the current upstream PR.
---
 multipathd/multipathd.service | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/multipathd/multipathd.service b/multipathd/multipathd.service
index 87cb534..1919b38 100644
--- a/multipathd/multipathd.service
+++ b/multipathd/multipathd.service
@@ -2,6 +2,8 @@
 Description=Device-Mapper Multipath Device Controller
 Before=iscsi.service iscsid.service lvm2-activation-early.service
 Before=local-fs-pre.target blk-availability.service shutdown.target
+Wants=systemd-udevd-kernel.socket
+After=systemd-udevd-kernel.socket
 After=multipathd.socket systemd-remount-fs.service
 DefaultDependencies=no
 Conflicts=shutdown.target
-- 
2.34.0