Comment by porridgeraisin

I wrap `pinentry` (which is in the dependency trees of gnupg, pacman, gvfs, udisks2 and other software that you can de-facto depend on on desktops) inside my own simple askpass.

  $ cat ~/scripts/pinentry-askpass
  #!/usr/bin/env bash
  
  pinentry <<INPUT | grep '^D ' | cut -c 3-
  SETPROMPT Password:
  GETPIN
  INPUT

  $ cat ~/.bashrc | grep ASKPASS
  export SUDO_ASKPASS="$HOME/scripts/pinentry-askpass"
  export SSH_ASKPASS="$SUDO_ASKPASS"

It automatically launches the GTK, TTY, or QT version depending on your environment.

It's also useful for agents to use sudo, you can write in instructions to tool-call `sudo -A` and you get a GUI popup to enter the password, and the agent continues from there. And since the "prompt" in pinentry can be customised... you can get the agent to set up a temporary askpass, which replaces "Password:" in the prompt with questions like "Can I delete this old log file in /var?" and you enter your password to authorise.