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From: David Craven <david@craven.ch>
Subject: Re: Build machine sysadmin support
Date: Sun, 21 Aug 2016 19:38:13 +0200
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To: guix-devel <guix-devel@gnu.org>

So guix doesn't work inside a vm - because /gnu/store is mounted
readonly. To be able to offload arm builds once guix system vm
--system=armhf-linux works, /gnu/store needs to be writeable.

Can multiple daemons concurrently use the same store?

or alternatively, can we move the

(unless (zero? (system* unionfs "-o"

"cow,allow_other,use_ino,suid,dev,max_files=65536"
                                "/rw-root=RW:/real-root=RO"
                                "/root"))
          (error "unionfs failed"))

to after the 9p filesystems have been mounted, so that the unionfs
allows writing to /gnu/store too?