How to programmatically get the current channel commits?

[Chris Marusich]

Hi,

It's possible to get the current Guix version via %guix-version,
exported by (guix config).  This is useful, among other reasons, for
embedding in package definitions that produce artifacts that are
destined to leave the store (e.g., a statically linked program you want
to ship off somewhere else).  Is it possible to programmatically get the
channel commits currently in use, also?

-- 
Chris

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