pyoxidizer

#!/bin/bash
set -euo pipefail
shopt -s extglob failglob

devel="$(dirname "$0")"
build="$(dirname "$0")/../build"

main() {
    local pyoxidizer

    if pyoxidizer="$(locate 2>/dev/null)"; then
        echo "--> Located existing PyOxidizer binary at $pyoxidizer" >&2
    else
        echo "--> Downloading PyOxidizer binary…" >&2
        pyoxidizer="$(download)"
        echo "--> Downloaded PyOxidizer binary to $pyoxidizer" >&2
    fi

    # On Linux, exec into a manylinux container with an old glibc version.
    # These manylinux images are used in the Python packaging ecosystem to
    # build widely-compatible binary packages (wheels).
    #
    # https://github.com/pypa/manylinux#readme
    if [[ "$(platform-system)" == Linux ]]; then
        mkdir -p "$build"/cache/{pyoxidizer,pip,cargo}
        exec "$devel"/within-container \
            --volume "$build/cache/pyoxidizer:/tmp/.cache/pyoxidizer" \
            --volume "$build/cache/pip:/tmp/.cache/pip" \
            --volume "$build/cache/cargo:/tmp/.cargo" \
            quay.io/pypa/manylinux2014_"$(platform-machine)" "$pyoxidizer" "$@"
    else
        exec "$pyoxidizer" "$@"
    fi
}

locate() {
    # Locate existing local copy of pyoxidizer.
    printf '%s\n' "$devel"/pyoxidizer-[0-9]*_"$(platform-machine)"?(.exe) | sort --reverse --version-sort | head -n1
}

download() {
    # Download pyoxidizer and return the path to it.
    #
    # Even though it's a Rust project, the easiest cross-platform way to
    # download it is via pip since they publish wheels with the binaries. :-)
    # Using Pip also allows us to piggy back on the version specification
    # system and platform-specific bits of a package manager/registry
    # ecosystem.
    local tmp
    tmp="$(mktemp -d)"

    # shellcheck disable=SC2064
    trap "rm -rf \"$tmp\"" EXIT

    python3 -m pip download \
        --disable-pip-version-check \
        --quiet \
        --no-deps \
        --dest "$tmp" \
        'pyoxidizer !=0.23.0' \
            >&2

    local wheels wheel binary
    wheels=("$tmp"/pyoxidizer-[0-9]*.whl)
    wheel="${wheels[0]}"
    binary="$(basename "$wheel" .whl)"

    if [[ "$(platform-system)" == Windows ]]; then
        binary+=.exe
    fi

    unzip -p "$wheel" '*/scripts/pyoxidizer*' > "$devel/$binary"
    chmod +x "$devel/$binary"

    echo "$devel/$binary"
}

platform-machine() {
    python3 -c 'import platform; print(platform.machine())'
}

platform-system() {
    python3 -c 'import platform; print(platform.system())'
}

main "$@"