90-systemd 460 Bytes
#!/bin/sh

# the part below relates to systemd as init specifically
rpm -q systemd-sysvinit || exit 0

# file str [str...]
# NB: str is also treated as a regex,
#     be careful if you copy the function
sub() {
	local file="$1"
	shift
	for i in "$@"; do
		grep -q "^$i" "$file" || echo "$i" >> "$file"
	done
}

# tune make-initrd
sub /etc/initrd.mk 'MODULES_PRELOAD += autofs4'

# don't allow systemd to set LANG (see also #27408)
sub /etc/locale.conf 'LANG='