osi-tools/osi-mk.d/testuser.sh

#!/hint/bash

post_install+=(01:testuser:early)
testuser:early() {
	local arg_mountpoint=$1

	useradd --root="$arg_mountpoint" \
		--gid=users \
		--comment='Test User' \
		--create-home \
		testuser
}

post_install+=(99:testuser:late)
testuser:late() {
	local arg_mountpoint=$1

	local uidgid
	uidgid=$(awk -v FS=: -v OFS=: '$1 == "testuser" { print $3, $4 }' < "${arg_mountpoint}/etc/passwd")
	chown -R -- "$uidgid" "${arg_mountpoint}/home/testuser"
}