Error when building the honeypot locally

[lorenzo-dev1]

I am trying to build the honeypot locally. Following the readme, I am executing:

docker buildx bake --load

Which failts with output:

[+] Building 2.6s (12/19)                                                                                                    docker:default
 => [dapp internal] load .dockerignore                                                                                                 0.0s
 => => transferring context: 2B                                                                                                        0.0s
 => [dapp internal] load build definition from Dockerfile                                                                              0.0s
 => => transferring dockerfile: 696B                                                                                                   0.0s
 => CANCELED [wrapped] resolve image config for docker.io/docker/dockerfile:1.4                                                        1.3s
 => CACHED [dapp] docker-image://docker.io/docker/dockerfile:1.4@sha256:9ba7531bd80fb0a858632727cf7a112fbfd19b17e94c4e84ced81e24ef1a0  0.0s
 => [dapp internal] load metadata for docker.io/riscv64/ubuntu:22.04                                                                   0.9s
 => CACHED [dapp dapp 1/3] FROM docker.io/riscv64/ubuntu:22.04@sha256:f31546bc71659c643837d57f09a161f04e866b59da4f418e064082a756c4c23  0.0s
 => [dapp internal] load build context                                                                                                 0.0s
 => CANCELED [dapp] https://github.com/cartesi/image-kernel/releases/download/v0.16.0/linux-headers-5.15.63-ctsi-2.tar.xz              0.3s
 => CACHED [dapp dapp 2/3] WORKDIR /home/dapp                                                                                          0.0s
 => ERROR [dapp builder 2/8] RUN <<EOF (apt-get update...)                                                                             0.3s
 => [wrapped internal] load .dockerignore                                                                                              0.0s
 => => transferring context: 2B                                                                                                        0.0s
 => [wrapped internal] load build definition from Dockerfile                                                                           0.0s
 => => transferring dockerfile: 4.03kB                                                                                                 0.0s
------
 > [dapp builder 2/8] RUN <<EOF (apt-get update...):
0.288 exec /bin/sh: exec format error
------
Dockerfile:4
--------------------
   3 |     ENV SOURCE_DATE_EPOCH=1692902406
   4 | >>> RUN <<EOF
   5 | >>> apt-get update
   6 | >>> apt-get install -y --no-install-recommends \
   7 | >>>     build-essential=12.9ubuntu3 \
   8 | >>>     clang-tidy=1:14.0-55~exp2
   9 | >>> rm -rf /var/lib/apt/lists/*
  10 | >>> EOF
  11 |
--------------------
ERROR: failed to solve: process "/bin/sh -c apt-get update\napt-get install -y --no-install-recommends \\\n    build-essential=12.9ubuntu3 \\\n    clang-tidy=1:14.0-55~exp2\nrm -rf /var/lib/apt/lists/*\n" did not complete successfully: exit code: 1

Is it due to the fact that the image is for the riscv64 architecture and I am trying to use it on a amd64 machine? Should I build it inside an emulator?

I thought it would work since I managed to run the echo-python example, which if I understood correctly uses the cartesi VM which runs in a riscv64 emulator.

[Yp3rion]

Although it does not seem to be explicitly mentioned in the README, the error exec /bin/sh: exec format error seems to be related to either the kernel capability binfmt_misc being disabled on the host Linux system or, more likely, to the required QEMU binaries (which in this case should be qemu-riscv64-static) not being available, as either of these would make it impossible to run executables meant for a different architecture.

I was able to fix this error and successfully complete the build process by installing the qemu-user-static package, which also includes qemu-riscv64-static and I don't think is typically present by default on any system.

I would suggest adding the above information to the README as it is not easy to understand what is going on from the error itself; I would be happy to do it myself via a pull request if that is also ok.

[lorenzo-dev1]

I was able to fix this error and successfully complete the build process by installing the qemu-user-static package, which also includes qemu-riscv64-static and I don't think is typically present by default on any system.

That solved it for myself as well.