Support GnuPG >= 2.1

[penguian]

See also metomi/rose#2483

National Computational Infrastructure now offers an Open OnDemand service that uses GnuPG 2.2.20.

Currently mosrs/setup.py contains

    agent = dedent("""
        [ -f ~/.gpg-agent-info ] && source ~/.gpg-agent-info
        if [ -S "${GPG_AGENT_INFO%%:*}" ]; then
            export GPG_AGENT_INFO
        else
            eval $( gpg-agent --daemon --allow-preset-passphrase --batch --max-cache-ttl 43200 --write-env-file ~/.gpg-agent-info )
        fi
        """)

This uses the file ~/.gpg-agent-info to set the environment variable GPG_AGENT_INFO. GnuPG since version 2.1 no longer supports this variable. In fact the way that gpg-agent is launched, as well as how sockets are used, has changed since 2.1. See [1], [2].

I have begun working on a fork of mosrs-setup that supports GnuPG both before and after version 2.1.

[ScottWales]

Is this needed at all on OOD - does the desktop session have a gpg agent attached?

[penguian]

The OOD desktop can be configured to run gpg-agent, but Rose 2019.X doesn't know about GPG 2.1X, so (e.g.) rosie go does not work on OOD. That's why I created an issue for Rose. The current issue for mosrs-setup is to ensure that caching of credentials for both MOSRS and NCI works as expected on OOD despite the mismatch between Rose and GPG.

FCM and Subversion should also work with cached credentials on OOD. I am not sure if mosrs-setup is needed for these, but am currently testing.

[penguian]

Correction: rosie go does work on OOD, provided it has the correct settings in rose.conf but asks for passwords each time it is run.