bin sh set -e summary of how this script can be called postinst config

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#!/bin/sh
set -e
# summary of how this script can be called:
# * <postinst> `configure' <most-recently-configured-version>
# * <old-postinst> `abort-upgrade' <new version>
# * <conflictor's-postinst> `abort-remove' `in-favour' <package>
# <new-version>
# * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
# <failed-install-package> <version> `removing'
# <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
#
# quoting from the policy:
# Any necessary prompting should almost always be confined to the
# post-installation script, and should be protected with a conditional
# so that unnecessary prompting doesn't happen if a package's
# installation fails and the `postinst' is called with `abort-upgrade',
# `abort-remove' or `abort-deconfigure'.
case "$1" in
configure)
# Add prometheus user
if ! getent passwd prometheus > /dev/null; then
adduser --quiet --system --home /var/lib/prometheus --no-create-home \
--group --gecos "Prometheus daemon" prometheus || true
fi
chown prometheus:prometheus /var/lib/prometheus || true
chown prometheus:prometheus /var/log/prometheus || true
chown prometheus:prometheus /etc/default/prometheus-postgres-exporter \
|| true
chmod 0640 /etc/default/prometheus-postgres-exporter || true
;;
abort-upgrade|abort-remove|abort-deconfigure)
:
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
# Automatically added by dh_systemd_enable
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask prometheus-postgres-exporter.service >/dev/null || true
# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled prometheus-postgres-exporter.service; then
# Enables the unit on first installation, creates new
# symlinks on upgrades if the unit file has changed.
deb-systemd-helper enable prometheus-postgres-exporter.service >/dev/null || true
else
# Update the statefile to add new symlinks (if any), which need to be
# cleaned up on purge. Also remove old symlinks.
deb-systemd-helper update-state prometheus-postgres-exporter.service >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
if [ -x "/etc/init.d/prometheus-postgres-exporter" ]; then
update-rc.d prometheus-postgres-exporter defaults >/dev/null
if [ -n "$2" ]; then
_dh_action=restart
else
_dh_action=start
fi
invoke-rc.d prometheus-postgres-exporter $_dh_action || exit $?
fi
fi
# End automatically added section
exit 0