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仅在 AGC Rust lane 1 消费可信缓存快照，保持独立 target 和关闭增量编译 从远端 master 的确定提交构建快照，拒绝以已有对象缓存的镜像继续叠层 隔离缓存配置与进程状态，缓存故障回退真实编译并保留失败状态 增加命中统计、编译耗时和缓存行为验证 同步缓存来源、镜像保留及不中断运行中 CI 的运维约定
87 lines
4.0 KiB
Bash
87 lines
4.0 KiB
Bash
#!/usr/bin/env bash
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# 仅消费镜像内的可信快照；所有写入留在当前容器的可写层。
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set -euo pipefail
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cache_root="${GENARRATIVE_CI_RUST_CACHE_ROOT:-/opt/genarrative-ci/rust-cache}"
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cache_binary="${cache_root}/sccache"
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state="${GENARRATIVE_CI_RUST_CACHE_STATE:-}"
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configure_local_cache() {
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# 不继承开发机/其它流水线的 OSS、S3、GHA 或 daemon 配置。
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local variable
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for variable in ${!SCCACHE_@}; do unset "${variable}"; done
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export SCCACHE_CONF="${state}/config"
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export SCCACHE_DIR="${cache_root}/objects"
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export SCCACHE_CACHE_SIZE=2G
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export SCCACHE_SERVER_UDS="${state}/server.sock"
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# 单个不可缓存的链接/测试阶段可能超过一分钟；保持统计直到 report 显式停止。
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export SCCACHE_IDLE_TIMEOUT=0
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export SCCACHE_IGNORE_SERVER_IO_ERROR=1
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}
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case "${1:-}" in
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prepare)
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: "${GITHUB_ENV:?GITHUB_ENV is required}"
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printf 'RUSTC_WRAPPER=\nCARGO_BUILD_RUSTC_WRAPPER=\nGENARRATIVE_CI_RUST_CACHE_STATE=\n' >> "${GITHUB_ENV}"
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fallback() { printf '[rust-cache] mode=direct reason=%s\n' "$1"; exit 0; }
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[[ -x "${cache_binary}" && -d "${cache_root}/objects" && -f "${cache_root}/rustc.txt" && -f "${cache_root}/source-commit.txt" && -f "${cache_root}/workspace.txt" ]] \
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|| fallback snapshot-unavailable
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if ! rustc -vV | cmp -s - "${cache_root}/rustc.txt"; then
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fallback toolchain-mismatch
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fi
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if [[ "$(pwd -P)" != "$(cat "${cache_root}/workspace.txt")" ]]; then
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fallback workspace-mismatch
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fi
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# 使用短 Unix socket 路径，避免共享固定端口或超出 sockaddr_un 长度。
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state="$(mktemp -d /tmp/ci-rust-cache.XXXXXX)"
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printf 'server_startup_timeout_ms = 5000\n' > "${state}/config"
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configure_local_cache
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# 探测必须暴露 daemon 故障；只有正式编译允许 sccache 的 IO 回退。
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unset SCCACHE_IGNORE_SERVER_IO_ERROR
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if ! timeout --kill-after=2 15 "${cache_binary}" "$(command -v rustc)" -vV > "${state}/probe.log" 2>&1; then
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timeout --kill-after=2 5 "${cache_binary}" --stop-server >/dev/null 2>&1 || true
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rm -rf -- "${state}"
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fallback wrapper-probe-failed
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fi
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script_path="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)/$(basename "${BASH_SOURCE[0]}")"
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# wrapper 路径也参与 Rust cache key；固定容器内路径，隔离由 job 容器保证。
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wrapper_path="${cache_root}/rustc-wrapper"
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printf '#!/usr/bin/env bash\nexec bash %q "$@"\n' "${script_path}" > "${wrapper_path}"
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chmod 700 "${wrapper_path}"
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{
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printf 'GENARRATIVE_CI_RUST_CACHE_ROOT=%s\n' "${cache_root}"
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printf 'GENARRATIVE_CI_RUST_CACHE_STATE=%s\n' "${state}"
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printf 'RUSTC_WRAPPER=%s\nCARGO_BUILD_RUSTC_WRAPPER=%s\n' "${wrapper_path}" "${wrapper_path}"
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} >> "${GITHUB_ENV}"
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printf '[rust-cache] mode=sccache snapshot=%s\n' "$(cat "${cache_root}/source-commit.txt")"
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;;
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report)
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if [[ -n "${state}" && -d "${state}" ]]; then
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configure_local_cache
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timeout --kill-after=2 5 "${cache_binary}" --show-stats || true
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timeout --kill-after=2 5 "${cache_binary}" --stop-server >/dev/null 2>&1 || true
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rm -rf -- "${state}"
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else
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printf '[rust-cache] mode=direct\n'
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fi
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;;
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*)
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# Cargo wrapper 协议：第一个参数是真实 rustc。失去缓存状态时仍执行原编译。
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if [[ -z "${state}" || ! -f "${state}/config" || -f "${state}/disabled" || ! -x "${cache_binary}" ]]; then
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exec "$@"
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fi
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configure_local_cache
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status=0
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"${cache_binary}" "$@" || status=$?
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if [[ "${status}" == 2 ]]; then
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# 固定 sccache 版本的自身错误码为 2；实际 rustc 失败通常为 1/101。
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# 只重试这次编译，不重跑 Cargo 或测试，真实编译错误仍按 rustc 状态返回。
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echo '[rust-cache] cache infrastructure failed; compiling directly' >&2
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# 后续 crate 直接编译，避免坏 daemon 让每个 crate 都支付一次启动超时。
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: > "${state}/disabled"
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exec "$@"
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fi
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exit "${status}"
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;;
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esac
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