[PATCH] guix-daemon: Add option to disable garbage collection.

[Roel Janssen]

Dear Guix,

I have an interesting situation where the guix-daemon cannot see all
directories that (may) contain Guix profiles, and therefore is not able
to judge whether a GC root is gone and can be collected, or whether it's
just inaccessible.

To be on the safe side, I'd like to disable garbage collection on this
system.  To achieve this, I wrote the attached patch.  Even though “it
works for me”, I don't think it's good to be added as-is.  At least I
need to figure out how to make the error message “Garbage collection is
disabled.” translatable.

The patch adds a “disableGarbageCollection” boolean variable to the
guix-daemon settings, and on each occasion where a store item may be
deleted, it checks this option.

This option can be set using “--disable-gc”.

It would be great if someone could review this and discuss whether
this is the right way to implement such a feature.  And to point out
what else would be needed to include this option in guix-daemon.

Thank you for your time.

Kind regards,
Roel Janssen

0001-guix-daemon-Add-option-to-disable-garbage-collection.patch
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