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# args: <group> [options]
_addgroup() {
	if ! getent group "$1" >/dev/null && groupadd "$@" >/dev/null; then
		need_group_update=1
	fi
}

# args: <group> [options]
_adduser() {
	if ! getent passwd "$1" >/dev/null && useradd "$@" >/dev/null; then
		need_passwd_update=1
	fi
}

post_install() {
	_backup=('etc/fstab' 'etc/crypttab' 'etc/group' 'etc/hosts' 'etc/ld.so.conf' 'etc/passwd'
	        'etc/shadow' 'etc/gshadow' 'etc/resolv.conf' 'etc/motd' 'etc/nsswitch.conf'
	        'etc/shells' 'etc/host.conf' 'etc/securetty' 'etc/profile' 'etc/issue')
	for _bk in ${_backup[@]}; do
		if [ -f ${_bk}.pacsave ]; then
			cp -av ${_bk}{.pacsave,}
		fi
	done
}

post_upgrade() {
	_addgroup optical -g 93
	_addgroup audio   -g 92
	_addgroup video   -g 91
	_addgroup floppy  -g 94
	_addgroup storage -g 95
	_addgroup log     -g 19
	_addgroup utmp    -g 20
	_addgroup power   -g 98
	_addgroup network -g 90
	_addgroup games   -g 50
	_addgroup uucp    -g 14
	_addgroup http    -g 33
	_adduser  http    -u 33 -d /srv/http -g http -s /usr/bin/nologin
	_addgroup scanner -g 96
	_addgroup rfkill  -g 24
	_addgroup lock    -g 54
	_addgroup uuidd   -g 68
	_adduser uuidd    -u 68 -d / -g uuidd -s /usr/bin/nologin
	_addgroup dbus    -g 81
	_adduser dbus     -u 81 -d / -g dbus -s /usr/bin/nologin
	_addgroup input   -g 97
	_addgroup systemd-journal -g 190
	_addgroup systemd-journal-gateway -g 191
	_adduser systemd-journal-gateway -u 191 -g 191 -d / -s /usr/bin/nologin
	_addgroup systemd-timesync -g 192
	_adduser systemd-timesync -u 192 -g 192 -d / -s /usr/bin/nologin
	_addgroup systemd-network -g 193
	_adduser systemd-network -u 193 -g 193 -d / -s /usr/bin/nologin
	_addgroup systemd-bus-proxy -g 194
	_adduser systemd-bus-proxy -u 194 -g 194 -d / -s /usr/bin/nologin
	_addgroup systemd-resolve -g 195
	_adduser systemd-resolve -u 195 -g 195 -d / -s /usr/bin/nologin

	# update shadow files if needed
	if (( need_group_update )); then
		grpconv >/dev/null
	fi

	if (( need_passwd_update )); then
		pwconv >/dev/null
	fi

	if ! grep -q '^include /etc/ld.so.conf.d/\*.conf$' etc/ld.so.conf; then
		echo 'include /etc/ld.so.conf.d/*.conf' >> etc/ld.so.conf
	fi

	# set "Last password change" > 0; otherwise su $user wont work
	for user in bin daemon mail ftp http nobody; do
		if LANG=C chage -l ${user} | grep -q 'password must be changed'; then
			chage -d 14871 ${user}
		fi
	done
}