# Meson's Python module doesn't support crosscompiling,
# and python dependencies may be another potential hurdle.
# There might also be a need to run runtime tests during configure time.
#
# The recommended practice is to rely on Docker to provide the x86_64 crosscompile toolchain,
# enabling native execution via binfmt.
#
# In simpler terms, everything except the crosscompile toolchain will be emulated.

name: Linux Qemu tests

on:
  pull_request:
    branches:
      - main
      - maintenance/**
  workflow_dispatch:

defaults:
  run:
    shell: bash

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  linux_qemu:
    # Only workflow_dispatch is enabled on forks.
    # To enable this job and subsequent jobs on a fork for other events, comment out:
    if: github.repository == 'numpy/numpy' || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-22.04
    continue-on-error: true
    strategy:
      fail-fast: false
      matrix:
        BUILD_PROP:
          - [
              "ppc64le",
              "powerpc64le-linux-gnu",
              "ppc64le/ubuntu:22.04",
              "-Dallow-noblas=true",
              "test_kind or test_multiarray or test_simd or test_umath or test_ufunc",
              "ppc64le"
            ]
          - [
              "ppc64le - baseline(Power9)",
              "powerpc64le-linux-gnu",
              "ppc64le/ubuntu:22.04",
              "-Dallow-noblas=true -Dcpu-baseline=vsx3",
              "test_kind or test_multiarray or test_simd or test_umath or test_ufunc",
              "ppc64le"
            ]
          - [
              "s390x",
              "s390x-linux-gnu",
              "s390x/ubuntu:22.04",
              "-Dallow-noblas=true",
              # Skipping TestRationalFunctions.test_gcd_overflow test
              # because of a possible qemu bug that appears to be related to int64 overflow in absolute operation.
              # TODO(@seiko2plus): Confirm the bug and provide a minimal reproducer, then report it to upstream.
              "(test_kind or test_multiarray or test_simd or test_umath or test_ufunc) and not test_gcd_overflow",
              "s390x"
            ]
          - [
              "s390x - baseline(Z13)",
              "s390x-linux-gnu",
              "s390x/ubuntu:22.04",
              "-Dallow-noblas=true -Dcpu-baseline=vx",
              "(test_kind or test_multiarray or test_simd or test_umath or test_ufunc) and not test_gcd_overflow",
              "s390x"
            ]
          - [
              "riscv64",
              "riscv64-linux-gnu",
              "riscv64/ubuntu:22.04",
              "-Dallow-noblas=true",
              "test_kind or test_multiarray or test_simd or test_umath or test_ufunc",
              "riscv64"
            ]
    env:
      TOOLCHAIN_NAME: ${{ matrix.BUILD_PROP[1] }}
      DOCKER_CONTAINER: ${{ matrix.BUILD_PROP[2] }}
      MESON_OPTIONS: ${{ matrix.BUILD_PROP[3] }}
      RUNTIME_TEST_FILTER: ${{ matrix.BUILD_PROP[4] }}
      ARCH: ${{ matrix.BUILD_PROP[5] }}
      TERM: xterm-256color

    name: "${{ matrix.BUILD_PROP[0] }}"
    steps:
    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
      with:
        submodules: recursive
        fetch-tags: true

    - name: Initialize binfmt_misc for qemu-user-static
      run: |
        # see https://hub.docker.com/r/tonistiigi/binfmt for available versions
        docker run --rm --privileged tonistiigi/binfmt:qemu-v9.2.2-52 --install all

    - name: Install GCC cross-compilers
      run: |
        sudo apt update
        sudo apt install -y ninja-build gcc-${TOOLCHAIN_NAME} g++-${TOOLCHAIN_NAME} gfortran-${TOOLCHAIN_NAME}

    - name: Cache docker container
      uses: actions/cache@v4.2.0
      id: container-cache
      with:
        path: ~/docker_${{ matrix.BUILD_PROP[1] }}
        key: container-${{ runner.os }}-${{ matrix.BUILD_PROP[1] }}-${{ matrix.BUILD_PROP[2] }}-${{ hashFiles('requirements/build_requirements.txt') }}

    - name: Creates new container
      if: steps.container-cache.outputs.cache-hit != 'true'
      run: |
        docker run --platform=linux/${ARCH} --name the_container --interactive \
          -v /:/host -v $(pwd):/numpy ${DOCKER_CONTAINER} /bin/bash -c "
          apt update &&
          apt install -y cmake git python3 python-is-python3 python3-dev python3-pip &&
          mkdir -p /lib64 && ln -s /host/lib64/ld-* /lib64/ &&
          ln -s /host/lib/x86_64-linux-gnu /lib/x86_64-linux-gnu &&
          rm -rf /usr/${TOOLCHAIN_NAME} && ln -s /host/usr/${TOOLCHAIN_NAME} /usr/${TOOLCHAIN_NAME} &&
          rm -rf /usr/lib/gcc/${TOOLCHAIN_NAME} && ln -s /host/usr/lib/gcc-cross/${TOOLCHAIN_NAME} /usr/lib/gcc/${TOOLCHAIN_NAME} &&
          rm -f /usr/bin/gcc && ln -s /host/usr/bin/${TOOLCHAIN_NAME}-gcc /usr/bin/gcc &&
          rm -f /usr/bin/g++ && ln -s /host/usr/bin/${TOOLCHAIN_NAME}-g++ /usr/bin/g++ &&
          rm -f /usr/bin/gfortran && ln -s /host/usr/bin/${TOOLCHAIN_NAME}-gfortran /usr/bin/gfortran &&
          rm -f /usr/bin/ar && ln -s /host/usr/bin/${TOOLCHAIN_NAME}-ar /usr/bin/ar &&
          rm -f /usr/bin/as && ln -s /host/usr/bin/${TOOLCHAIN_NAME}-as /usr/bin/as &&
          rm -f /usr/bin/ld && ln -s /host/usr/bin/${TOOLCHAIN_NAME}-ld /usr/bin/ld &&
          rm -f /usr/bin/ld.bfd && ln -s /host/usr/bin/${TOOLCHAIN_NAME}-ld.bfd /usr/bin/ld.bfd &&
          rm -f /usr/bin/ninja && ln -s /host/usr/bin/ninja /usr/bin/ninja &&
          git config --global --add safe.directory /numpy &&
          # No need to build ninja from source, the host ninja is used for the build
          grep -v ninja /numpy/requirements/build_requirements.txt > /tmp/build_requirements.txt &&
          python -m pip install -r /tmp/build_requirements.txt &&
          python -m pip install pytest pytest-xdist hypothesis typing_extensions &&
          rm -f /usr/local/bin/ninja && mkdir -p /usr/local/bin && ln -s /host/usr/bin/ninja /usr/local/bin/ninja
        "
        docker commit the_container the_container
        mkdir -p "~/docker_${TOOLCHAIN_NAME}"
        docker save -o "~/docker_${TOOLCHAIN_NAME}/the_container.tar" the_container

    - name: Load container from cache
      if: steps.container-cache.outputs.cache-hit == 'true'
      run: docker load -i "~/docker_${TOOLCHAIN_NAME}/the_container.tar"

    - name: Meson Build
      run: |
        docker run --rm --platform=linux/${ARCH} -e "TERM=xterm-256color" \
          -v $(pwd):/numpy -v /:/host the_container \
          /bin/script -e -q -c "/bin/bash --noprofile --norc -eo pipefail -c '
            cd /numpy && spin build --clean -- ${MESON_OPTIONS}
          '"

    - name: Meson Log
      if: always()
      run: 'cat build/meson-logs/meson-log.txt'

    - name: Run Tests
      run: |
        docker run --rm --platform=linux/${ARCH} -e "TERM=xterm-256color" \
          -v $(pwd):/numpy -v /:/host the_container \
          /bin/script -e -q -c "/bin/bash --noprofile --norc -eo pipefail -c '
            export F90=/usr/bin/gfortran
            cd /numpy && spin test -- -k \"${RUNTIME_TEST_FILTER}\"
          '"

