Fix the unlock linux host script to support users without password (#19665)

changes/19580-fix-linux-unlock-script-for-user-without-password

@@ -0,0 +1 @@
+* Fixed the Linux unlock script to support passwordless users.

ee/server/service/embedded_scripts/linux_unlock.sh

@@ -6,6 +6,16 @@ do
     echo "$user"
     if [ "$user" != "root" ]; then
         echo "Unlocking password for $user"
-        passwd -u $user
+        STDERR=$(passwd -u "$user" 2>&1 >/dev/null)
+        if [ $? -eq 3 ]; then
+          # possibly due to the user not having a password
+          # use this convoluted case approach to avoid bashisms (POSIX portable)
+          case "$STDERR" in
+            *"unlocking the password would result in a passwordless account"* )
+              # unlock and delete password to set it back to empty
+              passwd -ud "$user"
+            ;;
+          esac
+        fi
     fi
 done

scripts/mdm/linux/linux-unlock.sh

@@ -6,6 +6,16 @@ do
     echo "$user"
     if [ "$user" != "root" ]; then
         echo "Unlocking password for $user"
-        passwd -u $user
+        STDERR=$(passwd -u "$user" 2>&1 >/dev/null)
+        if [ $? -eq 3 ]; then
+          # possibly due to the user not having a password
+          # use this convoluted case approach to avoid bashisms (POSIX portable)
+          case "$STDERR" in
+            *"unlocking the password would result in a passwordless account"* )
+              # unlock and delete password to set it back to empty
+              passwd -ud "$user"
+            ;;
+          esac
+        fi
     fi
 done