# Returns a true value if there seems to be a system user account.
# OVERRIDE_SYSTEM_USER overrides this to assume that no system user account
# exists.
is_system_user () {
	if [ "$OVERRIDE_SYSTEM_USER" ]; then
		return 1
	fi

	if ! [ -e $ROOT/etc/passwd ]; then
		return 1
	fi
	
        # Assume NIS, or any uid from 1000 to 29999,  means there is a user.
        if grep -q '^+:' $ROOT/etc/passwd || \
           grep -q '^[^:]*:[^:]*:[1-9][0-9][0-9][0-9]:' $ROOT/etc/passwd || \
           grep -q '^[^:]*:[^:]*:[12][0-9][0-9][0-9][0-9]:' $ROOT/etc/passwd; then
                return 0
        else
                return 1
        fi
}

# Returns a true value if root already has a password.
root_password () {
	if ! [ -e $ROOT/etc/passwd ]; then
		return 1
	fi
	
	# Assume there is a root password if NIS is being used.
	if grep -q '^+:' $ROOT/etc/passwd; then
		return 0
	fi

	# Be more careful than usual about test arguments in the following,
	# just in case (for example) the encrypted password string is "!".

	if [ -e $ROOT/etc/shadow ] && \
	   [ -n "`grep ^root: $ROOT/etc/shadow | cut -d : -f 2`" ] && \
	   [ "x`grep ^root: $ROOT/etc/shadow | cut -d : -f 2`" != 'x*' ] && \
	   [ "x`grep ^root: $ROOT/etc/shadow | cut -d : -f 2`" != 'x!' ]; then
		return 0
	fi
	
	if [ -e $ROOT/etc/passwd ] && \
		[ -n "`grep ^root: $ROOT/etc/passwd | cut -d : -f 2`" ] && \
		[ "x`grep ^root: $ROOT/etc/passwd | cut -d : -f 2`" != 'xx' ]; then
			return 0
	fi

	return 1
}

password_is_empty () {
	db_get user-setup/allow-password-empty
	if [ "$RET" = true ]; then
		return 1 # don't consider this as empty if explicitly allowed
	fi
	[ -z "$1" ]
}

password_is_weak () {
	db_get user-setup/allow-password-weak
	if [ "$RET" = true ]; then
		return 1 # don't consider this as weak if explicitly allowed
	fi
	[ "$(printf %s "$1" | wc -c)" -lt 8 ]
}
