Unlock GnuPG keys keys on login using PAM.
pam-gnupg is an awesome project too.
For Arch Linux users is already a pam_exec-gpg package in the AUR.
Otherwise just copy the script, set the permissions and install pam.
cp pam_exec-gpg /usr/bin/pam_exec-gpg
chown root:root /usr/bin/pam_exec-gpg
chmod 755 /usr/bin/pam_exec-gpgYou need a running gpg-agent.
The agent have to be started before you login.
Take a look at the wiki how to configure gpg-agent.
A file ~/.gnupg/pam_exec-gpg should contain the keygrip.
Add the PAM call to your config:
auth optional pam_exec.so expose_authtok /usr/bin/pam_exec-gpg
To make sure that your keys are locked again you can restart your gpg-agent.
A good time to do this is when you lock your screen.
This means all keys are locked when you leave your device but the agent is still prepared for the next use.