We run gpg2 from another program. A typical command would be:
```
gpg2 --homedir $tmpdir --status-file logfile --import keyfile
```
In all cases we pass a temporary directory as ```--hostdir``` because we don't want to interfere or use the user's own gpg keys.
After the program runs the temporary directory is deleted.
After this, gpg-agent instances are found to be leaking:
```
16543 ? Ss 0:00 gpg-agent --homedir /tmp/virt-builder.eYvl5v/vb.gpghome.zyHsvg --use-standard-socket --daemon
16559 ? Ss 0:00 gpg-agent --homedir /tmp/virt-builder.eYvl5v/vb.gpghome.MN7zSD --use-standard-socket --daemon
```
They basically hang around forever as far as I can tell.