printf %a behaviour across architectures

run.sh

#!/bin/bash

# Make sure to follow
# https://docs.docker.com/build/building/multi-platform/
# to setup qemu with docker.

set -e -x

image=debian:bookworm-slim

cmd=""

# Manually copied from https://hub.docker.com/_/debian/tags?name=bookworm-slim
platforms="linux/386 linux/amd64 linux/arm/v5 linux/arm/v7 linux/arm64/v8 linux/mips64le linux/ppc64le linux/s390x"

mkdir -p out

for platform in $platforms; do
    # Weirdly, running with `linux/arm/v7` then `linux/arm64/v8`
    # does not make docker fetch a new image, prune docker...
    # Not recommended if you use docker for some other purpose
    yes | docker system prune -a

    outfile="out/$(echo $platform | tr '/' '-')"
    echo "$platform" > "$outfile"
    docker run --platform "$platform" --rm -it "$image" \
        sh -c "arch; LANG=C env printf '%a %.6a\\n' 0.12544 0.12544" >> "$outfile"
done

dos2unix out/*