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  1. In theory, enabling SSH support on the `gpg-agent` is as simple as passing the `--enable-ssh-support` option to the `gpg-agent`
  2. when initialized. However, this is tricky in Ubuntu (and probably many other Linux systems) because the `gpg-agent` is
  3. constantly relaunched. If we're on a machine we don't want to modify too much (as in disabling the classic `ssh-agent`), this
  4. is even trickier.
  5.  
  6. Here's how I solved it:
  7.  
  8. * Enable SSH support for the `gpg-agent` every time. While this is a system modification, it's a mild one and easy to revert.
  9.   This is accomplished with the command:
  10.  
  11. ```sh
  12. echo enable-ssh-support >> .gnupg/gpg-agent.conf
  13. ```
  14.  
  15. * Then, kill the `gpg-agent` manually. It'll be restarted automatically and pick up the new option:
  16.  
  17. ```sh
  18. kill $(pgrep gpg-agent)
  19. ```
  20.  
  21. * Finally, have the SSH client point to the `gpg-agent` when looking for keys, instead of the traditional `ssh-agent`. This
  22.   will only affect the current shell, so it won't affect the system beyond that. It's accomplished by rewiring the following
  23.   environment variable:
  24.  
  25. ```sh
  26. export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
  27. ```
  28.  
  29. And that's it! If you have an authentication GPG subkey on a smartcard, you can now use that to connect through SSH.
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