Regression in 1.12.0 when building deb package

[rmanus]

Since the upgrade to 1.12.0, my deb package cannot install anymore with the following error:

/var/lib/dpkg/info/jagos.postinst: 71: /var/lib/dpkg/info/jagos.postinst: Syntax error: \"else\" unexpected
dpkg: error processing package jagos (--install):
installed jagos package post-installation script subprocess returned error exit status 2

The culprit code around line 71 is

systemctl --system daemon-reload >/dev/null || true
debsystemctl=$(command -v deb-systemd-invoke || echo systemctl)
if ! systemctl is-enabled setup-hugepages >/dev/null
then
else
    $debsystemctl restart setup-hugepages >/dev/null || true
fi

Notice that there is no code in 'if' section and this is causing the error.

Fyi, my package is built with

--deb-systemd ./resources/build/jagos/setup-hugepages.service

[dev-gto]

Hi!
I can also confirm this issue. It seems to be related to the lines beginning at

fpm/templates/deb/postinst_upgrade.sh.erb

Line 23 in d50f756

<% if attributes[:deb_systemd_enable?]-%>

I'm using fpm within Ubuntu 18.04

[jordansissel]

I can probably provide a workaround in a patch, but I don't have the bandwidth to determine if it is the correct fix.

[jordansissel]

#1752 is an attempt to resolve this