userdel implementation using deluser and chroot

gistfile1.sh

#!/bin/sh

# I haven't tested this.
# I don't even know if it works.

# Also, -f is different.
# In this implementation, -f will automatically confirm -r

if [ "$UID" != "0" ]; then
	echo "You are not logged in as root. Cannot continue."
	exit 1
fi

if [ -z "$__CHROOT_USE_ENVIRON" ]; then
	FORCE=
	REMOVE=
	CHROOT=

	while getopts "frR:" opt; do
		case "$opt" in
		f)	FORCE="yes" ;;
		r)	REMOVE="yes" ;;
		R)	CHROOT="$OPTARG" ;;
		\?)	echo "Unknown option -$OPTARG ignored" >&2 ;;
		:)	echo "Option -$OPTARG requires an argument" >&2 ;;
		esac
	done

	USER=${@:$OPTIND}
else
	if [ -z "$__CHROOT_FORCE" -o -z "$__CHROOT_REMOVE" -o -z "$__CHROOT_USER" ]; then
		echo "__CHROOT_USE_ENVIRON, but missing environment!" >&2
		exit 1
	fi

	FORCE="$__CHROOT_FORCE"
	REMOVE="$__CHROOT_REMOVE"
	USER="$__CHROOT_USER"
fi

if [ -n "$CHROOT" ]; then
	if [ -d "$CHROOT" ]; then
		export __CHROOT_FORCE=$FORCE
		export __CHROOT_REMOVE=$REMOVE
		export __CHROOT_USER=$USER
		export __CHROOT_USE_ENVIRON=yes
		exec chroot "$CHROOT" $0
	else
		echo "$CHROOT is not a directory" >&2 ;;
	fi
	exit 1
fi

# Grab their home and mail dir
USER_HOME=$( grep "^$USER" /etc/passwd | cut -d: -f6 )

# Delete the user
deluser $USER

# Remove their home dir
if [ -n "$REMOVE" ]; then
	DO_REMOVE=

	if [ -z "$FORCE" ]; then
		printf "Are you sure you want to rm -rf $USER_HOME? (y/N) "
		read $confirm
		if [ "$confirm" != "y" -o "$confirm" != "Y" ]; then
			echo "Not removing directory"
		else
			DO_REMOVE=yes
		fi
	else
		DO_REMOVE=yes
	fi

	[ -n "$DO_REMOVE" ] && rm -rf $USER_HOME
fi