commit 3e958f2d1758ab68837a056e0f1fad0165b9e6e3
Author: Oleg Solovyov <mcpain@altlinux.org>
Date:   Wed Mar 28 12:43:39 2018 +0300

    - get UNIQUE devices by UUID

diff --git a/alterator-luks/backend3/luks b/alterator-luks/backend3/luks
index 7484dc2..a88e252 100755
--- a/alterator-luks/backend3/luks
+++ b/alterator-luks/backend3/luks
@@ -10,8 +10,9 @@ CRYPTSETUP_KEY=/tmp/empty
 luks_chpasswd()
 {
 	local errmsg=
-	for device in $(blkid -o device);
+	for UUID in $(blkid -o value -s UUID | sort -u);
 	do
+		device=$(blkid -U "$UUID")
 		[ "$(blkid -o value -s TYPE "$device")" = "crypto_LUKS" ] || continue
 		cryptsetup isLuks "$device" || continue
 		errmsg="$(echo "$1" | cryptsetup --force-password --key-file "$CRYPTSETUP_KEY" luksChangeKey "$device" 2>&1)" ||