Bug#881303: lvm2: dh_installsystemd fragment generates warning during configuration

[Julian Gilbey]

Package: lvm2
Version: 2.02.176-1
Severity: normal

I don't know whether the bug here lies in dh_installsystemd or in
lvm2, so please reassign to dh_installsystemd if this is the wrong
package.

At the end of lvm2's debian/rules, it says:
	dh_installsystemd --remaining-packages

But the lvm2 postinst then ends up finishing with the following:

# Automatically added by dh_installsystemd/10.10.5
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
	if [ -n "$2" ]; then
		_dh_action=try-restart
	else
		_dh_action=start
	fi
	deb-systemd-invoke $_dh_action  >/dev/null || true
fi
# End automatically added section

and this throws up the warning message:

Syntax: /usr/bin/deb-systemd-invoke <action> <unit file> [<unit file> ...]

because no unit file is listed after $_dh_action.

I'm inclined to think that this is a debhelper bug...

Best wishes,

   Julian

-- System Information:
Debian Release: buster/sid
  APT prefers stretch
  APT policy: (500, 'stretch'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8), LANGUAGE=en_GB.utf8 (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages lvm2 depends on:
ii  dmeventd                  2:1.02.145-1
ii  dmsetup                   2:1.02.145-1
ii  libblkid1                 2.30.2-0.1
ii  libc6                     2.24-17
ii  libdevmapper-event1.02.1  2:1.02.145-1
ii  libdevmapper1.02.1        2:1.02.145-1
ii  liblvm2app2.2             2.02.176-1
ii  libreadline5              5.2+dfsg-3+b1
ii  libsystemd0               235-2
ii  libudev1                  235-2
ii  lsb-base                  9.20170808

Versions of packages lvm2 recommends:
ii  thin-provisioning-tools  0.7.4-2

lvm2 suggests no packages.

-- no debconf information