assemble arm64 image in amd64 container

1. In order to support qemu-binfmt with non-native chroot, install
qemu-user-static on host rather than in container

On debian 12 host, after install qemu-user-static

$ cat /proc/sys/fs/binfmt_misc/qemu-aarch64
enabled
interpreter /usr/libexec/qemu-binfmt/aarch64-binfmt-P
flags: POCF
offset 0
magic 7f454c460201010000000000000000000200b700
mask ffffffffffffff00fffffffffffffffffeffffff

On an amd64 host:
$ debootstrap --arch=arm64 buster buster-chroot http://deb.debian.org/debian
...
$ chroot buster-chroot /bin/bash

See https://issues.guix.gnu.org/36117 for detail

2. Install arch-test in container unconditionally
which is required by mmdebstrap

root@0fb7bae77452:/usr/src/config/uefi-arm64-ostree# ruck build --config image.yaml
...
2024-04-01 12:30:49,605 Running mmdebstrap.
I: automatically chosen mode: root
E: install arch-test for foreign architecture support

Signed-off-by: Hongxu Jia <[email protected]>

docker/Dockerfile

@@ -4,6 +4,7 @@ FROM debian:testing
 # hadolint ignore=DL3008
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
+        arch-test \
         mmdebstrap \
         bubblewrap \
         dosfstools \
@@ -32,8 +33,6 @@ RUN apt-get update && \
         git && \
         rm -rf /var/lib/apt/lists/*
 
-RUN if [ "$(uname -m)" = "x86_64" ]; then apt update && apt install qemu-user-static arch-test -y; fi
-
 COPY files/pip.conf /etc/pip.conf
 RUN pip install omegaconf
 

tools/build-container.sh

@@ -1,3 +1,7 @@
 #!/bin/bash
 
+# qemu-binfmt with non-native chroot
+sudo apt update
+sudo apt install qemu-user-static -y
+
 docker build -t ruck docker