#!/bin/sh -e

. /usr/share/debconf/confmodule

db_capb "backup"

if [ "$1" ]; then
	ROOT="$1"
else
	ROOT=
fi
export ROOT

. /usr/lib/user-setup/functions.sh

# For the convenience of heavy testers
set_special_users() {
	local realname
	case "$fullname" in
	    fjp)	realname="Frans Pop" ;;
	    tbm)	realname="Martin Michlmayr" ;;
	    *)		return 1 ;;
	esac
	db_set passwd/user-fullname "$realname"
	userdefault=$fullname
	db_fset passwd/username seen true
	return 0
}

# Main loop starts here. Use a state machine to allow jumping back to
# previous questions.
STATE=0
while :; do
	case "$STATE" in
	    0)
		# Ask how the password files should be set up.
		db_input low passwd/shadow || true
		# Ask if root should be allowed to login.
		db_input medium passwd/root-login || true
		;;
	    1)
		db_get passwd/root-login
		if [ "$RET" = false ]; then
			# root password will be locked
			db_set passwd/root-password ""
			db_set passwd/root-password-crypted "!"
		elif ! root_password; then
			# First check whether the root password was preseeded
			# crypted to an actual password (not locked)
			db_get passwd/root-password-crypted || true
			if ! test "$RET" || [ "x$RET" = "x!" ]; then
				# No preseed of the root password hash
				# we will prompt the user
				db_set passwd/root-password-crypted ""
				db_input critical passwd/root-password || true
				db_input critical passwd/root-password-again || true
			fi
		fi
		;;
	    2)
		db_get passwd/root-login
		if [ "$RET" = false ]; then
			# root password will be locked
			db_set passwd/root-password-again ""
		elif ! root_password; then
			# First check whether the root password was preseeded crypted
			db_get passwd/root-password-crypted || true
			if ! test "$RET" ; then
				# Compare the two passwords, loop back if not
				# identical, or if empty.
				db_get passwd/root-password
				ROOT_PW="$RET"
				if [ -z "$ROOT_PW" ]; then
					db_fset user-setup/password-empty seen false
					db_input critical user-setup/password-empty
					db_fset passwd/root-password seen false
					db_fset passwd/root-password-again seen false
					STATE=1
					continue
				elif password_is_weak "$ROOT_PW"; then
					db_set user-setup/password-weak false
					db_fset user-setup/password-weak seen false
					db_input critical user-setup/password-weak
					# TODO would be better to extend state machine
					if ! db_go; then
						STATE=1
						continue
					fi
					db_get user-setup/password-weak || RET=
					if [ "$RET" != true ]; then
						# user doesn't want to force
						# weak password
						db_fset passwd/root-password seen false
						db_fset passwd/root-password-again seen false
						STATE=1
						continue
					fi
				fi
				db_get passwd/root-password-again
				if [ "$ROOT_PW" != "$RET" ]; then
					db_fset user-setup/password-mismatch seen false
					db_input critical user-setup/password-mismatch
					db_fset passwd/root-password seen false
					db_fset passwd/root-password-again seen false
					STATE=1
					continue
				fi
				ROOT_PW=''
			fi
		fi
		;;
	    3)
		# Ask if a non-root user should be made, if there is not
		# already one.
		db_get passwd/root-login
		if [ "$RET" = false ]; then
			# always make non-root user; this user will be able
			# to sudo to root
			db_set passwd/make-user true
		elif ! is_system_user; then
			db_input medium passwd/make-user || true
		fi
		;;
	    4)
		# Prompt for user info.
		db_get passwd/make-user
		if [ "$RET" = true ] && ! is_system_user; then
			db_input critical passwd/user-fullname || true
		fi
		;;
	    5)
		# Prompt for user info.
		db_get passwd/make-user
		if [ "$RET" = true ] && ! is_system_user; then
			LOOP=""
			db_get passwd/username
			if [ -z "$RET" ]; then
				db_get passwd/user-fullname
				fullname=$RET
				if ! set_special_users; then
					userdefault=$(echo "$fullname" | \
						sed 's/ .*//' | LC_ALL=C tr A-Z a-z)
				fi
				if test -n "$userdefault" && \
					LC_ALL=C expr "$userdefault" : '[a-z][-a-z0-9]*$' >/dev/null; then
					db_set passwd/username "$userdefault"
				fi
			fi
			db_input critical passwd/username || true
		fi
		;;
	    6)
		# Verify user.
		db_get passwd/make-user
		if [ "$RET" = true ] && ! is_system_user; then
			# Verify the user name, loop with message if bad.
			db_get passwd/username
			USER="$RET"
			if ! LC_ALL=C expr "$USER" : '[a-z][-a-z0-9]*$' >/dev/null; then
				db_fset passwd/username seen false
				db_fset passwd/username-bad seen false
				db_input critical passwd/username-bad
				STATE=3
				continue
			fi
			
			if grep -v '^#' /usr/lib/user-setup/reserved-usernames | \
			   grep -q "^$USER\$"; then
				db_fset passwd/username seen false
				db_fset passwd/username-reserved seen false
				db_subst passwd/username-reserved USERNAME "$USER"
				db_input critical passwd/username-reserved
				STATE=3
				continue
			fi

			db_get passwd/user-password-crypted || true
			if ! test "$RET" ; then
				db_input critical passwd/user-password || true
				db_input critical passwd/user-password-again || true
			fi
		fi
		;;
	    7)
		db_get passwd/make-user
		if [ "$RET" = true ] && ! is_system_user; then
			db_get passwd/user-password-crypted || true
			if ! test "$RET" ; then
				# Compare the two passwords, loop with message if not
				# identical
				db_get passwd/user-password
				USER_PW="$RET"
				db_get passwd/user-password-again
				if [ "$USER_PW" != "$RET" ]; then
					db_set passwd/user-password ""
					db_set passwd/user-password-again ""
					db_fset user-setup/password-mismatch seen false
					db_input critical user-setup/password-mismatch
					db_fset passwd/user-password seen false
					db_fset passwd/user-password-again seen false
					STATE=6
					continue
				fi
				# Loop if the password is empty, and it's not
				# specifically allowed by preseeding
				if password_is_empty "$USER_PW"; then
					db_set passwd/user-password ""
					db_set passwd/user-password-again ""
					db_fset user-setup/password-empty seen false
					db_input critical user-setup/password-empty
					db_fset passwd/user-password seen false
					db_fset passwd/user-password-again seen false
					STATE=6
					continue
				elif [ "$USER_PW" ] && password_is_weak "$USER_PW"; then
					db_set user-setup/password-weak false
					db_fset user-setup/password-weak seen false
					db_input critical user-setup/password-weak
					# TODO would be better to extend state machine
					if ! db_go; then
						STATE=6
						continue
					fi
					db_get user-setup/password-weak || RET=
					if [ "$RET" != true ]; then
						# user doesn't want to force
						# weak password
						db_set passwd/user-password ""
						db_set passwd/user-password-again ""
						db_fset passwd/user-password seen false
						db_fset passwd/user-password-again seen false
						STATE=6
						continue
					fi
				fi
			fi
		fi
		;;
	    8)
		db_get passwd/username
		USER="$RET"
		db_get passwd/make-user
		if [ "$RET" = true ] && [ ! -d "$ROOT/home/$USER" ]; then
			db_input high user-setup/encrypt-home || true
		fi
		;;
	    9)
		ecryptfs_in_use=
		for homedir in "$ROOT/home"/*; do
			if [ -d "$homedir/.ecryptfs" ]; then
				ecryptfs_in_use=1
				break
			fi
		done
		if [ "$ecryptfs_in_use" ] || \
		   (db_get user-setup/encrypt-home && [ "$RET" = true ]); then
			apt-install ecryptfs-utils 2>/dev/null
		fi
		;;
	    *)
		break
		;;
	esac

	if db_go; then
		STATE=$(($STATE + 1))
	else
		STATE=$(($STATE - 1))
	fi
	#echo "ON STATE: $STATE"
done

if [ "$STATE" = -1 ]; then
	exit 10
fi
