Be nicer to non-amd64 hosts #452
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Currently, we assume `debos` will run only on `amd64` hosts. However, `fakemachine` recently gained the ability to run on `arm64` hosts, so we shouldn't make this assumption anymore. This change only sets the path to `qemu` when building for a foreign arch, instead of setting it for all architectures except x86 ones. Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
This change marks the target architecture as "foreign" if it differs from the current host architecture, instead of hardcoding an expected host architecture. Due to Debian architectures not translating directly to their Go equivalents (like `mips*el` being `mips*le` instead, or `i386` being simply `386` in Go), this will only work for `amd64`, `arm64` and `riscv64` hosts. However, it seems unlikely running `debos` on a 32-bit host (or even on `mips64el`) will become a compelling use-case in the future, making this issue an acceptable limitation. Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
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With fakemachine now being compatible with arm64 hosts, it is possible to build and run debos on this architecture. However, it will still assume it runs on amd64, hence executing actions in the chroot through qemu and calling debootstrap with the
--foreignflag set, even when building for the same architecture.This PR makes use of runtime architecture detection to avoid those unnecessary tricks.