ludo@gnu.org (Ludovic Courtès) skribis:

> Mark H Weaver <mhw@netris.org> skribis:
>
>> It would be great if we had a build hook to enable guix-daemon to
>> natively build packages for any system supported by qemu, by running the
>> build processes within qemu.
>
> QEMU has a ‘qemu-binfmt-conf.sh’ script that installs binfmt_misc
> handlers for all the architecture-specific ELF variants.  Once you’ve
> run this script, you can transparently run, say, ARM executables (the
> kernel takes care of invoking ‘qemu-arm’ for you).

[...]

> Then we just need to tell the daemon to not complain (“but I’m an
> 'x86_64-linux'”).

The attached patch does that.

However, there’s an added complication: the file name of the qemu-*
executables registered in binfmt_misc are apparently resolved relative
to the root directory of the process that does ‘execve’.

So we would need to add a guix-daemon --chroot-directory=DIR argument
for each element in the closure of QEMU.  Not great.

Thoughts?

Ludo’.