standard_init_linux.go:211: exec user process caused "exec format error" on make build ARCH=arm32v7

[liampaull]

# create build environment
docker build \
	-t arm32v7/dt_apriltags:wheel-python \
	--build-arg ARCH="arm32v7" \
	--build-arg PYTHON_VERSION=""2"" \
	/home/liam/sandbox/lib-dt-apriltags/
Sending build context to Docker daemon  13.59MB
Step 1/17 : ARG PYTHON_VERSION="PYTHON_VERSION_NOT_SET"
Step 2/17 : ARG ARCH="ARCH_NOT_SET"
Step 3/17 : FROM ${ARCH}/ubuntu:18.04
18.04: Pulling from arm32v7/ubuntu
de691405df56: Pull complete 
e5a766b93ee2: Pull complete 
8c97e104d736: Pull complete 
d7a97b3bf2bf: Pull complete 
Digest: sha256:8d8280314eac99b6ce1e5307d0093411150a8c09b59f390658952d50139c4722
Status: Downloaded newer image for arm32v7/ubuntu:18.04
 ---> 40d364ec676a
Step 4/17 : ARG ARCH
 ---> Running in 4ce703c96804
Removing intermediate container 4ce703c96804
 ---> 80d0b7d1669f
Step 5/17 : ARG PYTHON_VERSION
 ---> Running in c128de70543c
Removing intermediate container c128de70543c
 ---> d906bb946c05
Step 6/17 : ENV QEMU_EXECVE 1
 ---> Running in b603e3e8d381
Removing intermediate container b603e3e8d381
 ---> 6f0499da46e0
Step 7/17 : COPY ./assets/qemu/${ARCH}/ /usr/bin/
 ---> 734af0b66598
Step 8/17 : RUN apt-get update &&   apt-get install -y     python${PYTHON_VERSION}     python${PYTHON_VERSION}-pip     cmake
 ---> Running in 10090cc4b8a3
standard_init_linux.go:211: exec user process caused "exec format error"

[liampaull]

@afdaniele any ideas?

[afdaniele]

@liampaull
yes, you can build for a different arch only after you set up QEMU. You need to run this on your computer

docker run --rm --privileged multiarch/qemu-user-static:register --reset

You don't see this with dts devel build because the shell does it for you.