dtourolle
5dc1279429
Cap both halves of the container build: CARGO_BUILD_JOBS limits how many rustc processes cargo starts, while --cpus limits what the container gets regardless of what nested build scripts spawn — cc, cmake, and ring's asm build all parallelise on their own account and do not consult cargo. Without both, a full cross-compile takes every thread on the host and makes the machine unusable for the length of a background build. Assisted-by: LLM
73 lines
2.4 KiB
Bash
Executable File
73 lines
2.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Run a command inside the DarkRoom Android build container.
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#
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# ./docker/android/build.sh cargo ndk -t arm64-v8a build --release
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# ./docker/android/build.sh cargo check --target aarch64-linux-android
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# ./docker/android/build.sh # interactive shell
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#
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# Builds the image on first use. Rebuild after editing the Dockerfile with:
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# ./docker/android/build.sh --rebuild
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set -euo pipefail
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IMAGE="darkroom-android:latest"
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HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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REPO="$(cd "${HERE}/../.." && pwd)"
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# Prefer podman (rootless by default); fall back to docker.
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if command -v podman >/dev/null 2>&1; then
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ENGINE=podman
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elif command -v docker >/dev/null 2>&1; then
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ENGINE=docker
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else
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echo "error: neither podman nor docker found" >&2
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exit 1
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fi
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if [[ "${1:-}" == "--rebuild" ]]; then
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shift
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"${ENGINE}" build -t "${IMAGE}" "${HERE}"
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elif ! "${ENGINE}" image exists "${IMAGE}" 2>/dev/null && \
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! "${ENGINE}" image inspect "${IMAGE}" >/dev/null 2>&1; then
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echo "==> building ${IMAGE} (first run; several minutes)"
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"${ENGINE}" build -t "${IMAGE}" "${HERE}"
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fi
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# Persist the cargo registry and target dir across runs, or every build
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# re-downloads the crate index.
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CACHE="${XDG_CACHE_HOME:-${HOME}/.cache}/darkroom-android"
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mkdir -p "${CACHE}/registry" "${CACHE}/target"
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ARGS=(
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--rm
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-v "${REPO}:/work:z"
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-v "${CACHE}/registry:/opt/cargo/registry:z"
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-v "${CACHE}/target:/work/target-android:z"
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-e CARGO_TARGET_DIR=/work/target-android
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-w /work
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)
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# Build parallelism. A full cross-compile will otherwise take every thread on
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# the host and make the machine unusable for the length of the build, which is
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# a poor trade when it is running in the background.
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#
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# Both halves are needed: CARGO_BUILD_JOBS caps how many rustc processes cargo
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# starts, while --cpus caps what the container gets no matter what any nested
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# build script decides to spawn (cc, cmake, and ring's asm build all parallelise
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# on their own account and do not consult cargo).
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JOBS="${DARKROOM_BUILD_JOBS:-8}"
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if [[ "${JOBS}" != "0" ]]; then
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ARGS+=(--cpus "${JOBS}" -e "CARGO_BUILD_JOBS=${JOBS}")
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fi
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# Rootless podman already maps the host user; docker needs it stated.
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if [[ "${ENGINE}" == "docker" ]]; then
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ARGS+=(--user "$(id -u):$(id -g)")
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fi
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if [[ $# -eq 0 ]]; then
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ARGS+=(-it)
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set -- /bin/bash
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fi
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exec "${ENGINE}" run "${ARGS[@]}" "${IMAGE}" "$@"
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