How to change language automatically when prompted for a password?

After a dialogue with Gunnar Hjalmarsson in the comment field I think the following shellscript should work in order to run programs with elevated permissions. It will use US English keyboard when you type the password, and reset the keyboard to your own keyboard directly after that.

You can use the name mysudo or if you wish a shorter (but unique) program name.

#!/bin/bash

curkeyb=$(setxkbmap -query|grep 'layout:'|sed 's/.* //')
setxkbmap us
sudo echo "sudo $@"
setxkbmap "$curkeyb"
sudo "$@"

Make it executable and copy it to a directory in PATH, for example

chmod +x mysudo
mv mysudo /usr/local/sbin

and then you can use it instead of sudo

Examples:

mysudo nano hello.txt
mysudo -H gedit hello.txt  # remember -H with GUI programs
mysudo parted -ls

Explanation:

1. The shebang tells that bash should be used to run the shellscript.
2. The original keyboard setting is saved.
3. The keyboard is changed to US English.
4. sudo is started, and if not run recently, it will ask for password.
5. The keyboard is reset to the original setting.
6. The previous sudo command gave the shell elevated permissions for some minutes. This means that the real command can be run with the original keyboard and elevated permissions without asking for password (again).

If you install and run onboard you will see how the keyboard changes so that the top row of keys will map the numbers 1 2 ... 9 0 when the system is waiting for the password, and then changes back to your lanaguage.