postinst is in ceph-osd 12.2.4-0ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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# postinst script for ceph-osd
#
# see: dh_installdeb(1)
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>
# 	postinst abort-remove
# 	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
[ -f "/etc/default/ceph" ] && . /etc/default/ceph
[ -z "$SERVER_USER" ] && SERVER_USER=ceph
[ -z "$SERVER_GROUP" ] && SERVER_GROUP=ceph
case "$1" in
    configure)
	:
    ;;
    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_python2:
if which pycompile >/dev/null 2>&1; then
	pycompile -p ceph-osd 
fi
# End automatically added section
# Automatically added by dh_systemd_enable/11.1.4ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# This will only remove masks created by d-s-h on package removal.
	deb-systemd-helper unmask 'ceph-osd.target' >/dev/null || true
	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'ceph-osd.target'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'ceph-osd.target' >/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 'ceph-osd.target' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_start/11.1.4ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
		if [ -d /run/systemd/system ]; then
			systemctl --system daemon-reload >/dev/null || true
		if [ -n "$2" ]; then
			_dh_action=restart
		else
			_dh_action=start
		fi
		deb-systemd-invoke $_dh_action 'ceph-osd.target' >/dev/null || true
	fi
fi
# End automatically added section
exit 0
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