Thanks a lot Ludovic, this really helped :) .
The following command nearly worked:
guix archive --export --recursive hello $(guix build --source --sources=transitive hello $MORE_SOURCES)
but I had to explicitly add more sources, namely /gnu/store/*-$i.drv for these files:
binutils-2.23.2.tar.xz
bison-3.0.4.tar.xz
gc-7.6.4.tar.gz
gcc-4.8.2.tar.xz
glibc-2.18.tar.xz
guile-2.0.9.tar.xz
gcc-4.9.4.tar.xz
gettext-0.19.8.1.tar.gz
gmp-6.1.2.tar.xz
guile-2.2.3.tar.xz
libatomic_ops-7.6.4.tar.gz
libffi-3.2.1.tar.gz
libtool-2.4.6.tar.xz
libunistring-0.9.9.tar.xz
m4-1.4.18.tar.xz
perl-5.26.1.tar.gz
pkg-config-0.29.2.tar.gz
static-binaries.tar.xz
texinfo-6.5.tar.xz
zlib-1.2.11.tar.gz
It seems that these are used to bootstrap guile and GCC. Is there a way to get this list programmatically, without hardcoding version numbers?
I have updated at
https://github.com/jsmaniac/guix-reproducible-system/tree/guix-answer a small automated script which creates the archive, creates a QEMU VM with a minimalistic
Guix configuration, copies the .nar archive inside the VM, imports it and tries guix build --check hello (some Guile test seems to fall in a deadlock, but that's for another topic).
Cheers,
Georges Dupéron