linux-kernel-bbrv3/.github/workflows/build.yml

name: 构建带有BBRv3的内核

# Gitea Actions reads workflows from .github/workflows/ (and .gitea/workflows/).
# This workflow targets a self-hosted Gitea instance. Kernel .deb packages are
# published to Gitea's built-in Debian package registry (an apt source), not to
# Releases. arm64 is cross-compiled on the x86_64 runner
# (CROSS_COMPILE=aarch64-linux-gnu-), so only a single ubuntu-latest runner is needed.

on:
  workflow_dispatch:
  schedule:
    # Daily kernel refresh at 20:00 UTC = 04:00 Asia/Shanghai (GMT+8). Gitea/GitHub
    # Actions cron is evaluated in UTC. BBRv3 itself stays pinned to the repo patch.
    - cron: "0 20 * * *"

env:
  # Gitea Debian package registry for this owner, e.g.
  # https://git.chilldove.com/api/packages/icePigeon/debian
  PKG_REGISTRY: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/debian
  PKG_USER: ${{ github.repository_owner }}
  # Optional origin pin for uploads. The kernel image .deb is >100 MB, which trips
  # the request-body cap of a CDN/proxy fronting the registry (Cloudflare free/pro
  # caps at 100 MB and returns 413 at the edge, before the body reaches Gitea — the
  # origin itself accepts it). Set the Gitea repo/org variable PKG_ORIGIN_IP to the
  # registry origin's address (the host behind the CDN) and the publish step pins the
  # upload straight there via curl --resolve, bypassing the CDN. vars (unlike secrets)
  # ARE available to workflow-level env. Leave empty if no CDN fronts uploads.
  PKG_ORIGIN_IP: ${{ vars.PKG_ORIGIN_IP }}
  # NOTE: PKG_TOKEN (the write:package secret) is declared at JOB level below. The
  # secrets context is not available to workflow-level env, so a value set here
  # would silently be empty.

permissions:
  # Uploads authenticate via the PKG_TOKEN secret, not the auto-injected token,
  # so no write permission is requested here.
  contents: read

concurrency:
  group: bbrv3-kernel-build
  cancel-in-progress: true

jobs:
  preflight:
    runs-on: ubuntu-latest
    env:
      PKG_TOKEN: ${{ secrets.PKG_TOKEN }}
    outputs:
      kernel_version: ${{ steps.plan.outputs.kernel_version }}
      build_needed: ${{ steps.plan.outputs.build_needed }}
    steps:
      - name: 检出代码
        uses: actions/checkout@v4

      - name: 选择 stable 内核并检查 registry
        id: plan
        run: |
          set -euo pipefail

          # Track an established stable series, never the freshly-cut top series
          # that still equals mainline. See scripts/select-stable-kernel.sh.
          version=$(bash scripts/select-stable-kernel.sh)
          echo "Selected stable kernel: $version"
          echo "kernel_version=$version" >> "$GITHUB_OUTPUT"

          # Build unless BOTH arches already have their COMPLETE artifact set
          # (kernel image + meta@version + config, plus headers on amd64). A partial
          # previous upload counts as incomplete and triggers a rebuild.
          missing=0
          for da in amd64 arm64; do
            if bash scripts/registry-has-all.sh "$PKG_REGISTRY" stable main "$version" "$da"; then
              echo "All artifacts for $version ($da) already in registry."
            else
              missing=1
            fi
          done

          if [ "$missing" -eq 1 ]; then
            echo "build_needed=true" >> "$GITHUB_OUTPUT"
            echo "At least one arch for $version is incomplete; build will continue."
          else
            echo "build_needed=false" >> "$GITHUB_OUTPUT"
            echo "All arches for $version fully published; ending before build."
          fi

  build:
    needs: preflight
    if: needs.preflight.outputs.build_needed == 'true'
    strategy:
      fail-fast: false
      matrix:
        include:
          # Both targets build on a single x86_64 runner; arm64 is cross-compiled.
          # is_primary builds the Architecture:all bbrv3-config package exactly once.
          - arch: x86_64
            deb_arch: amd64
            runs_on: ubuntu-latest
            cross_compile: ""
            localversion: -bbrv3
            is_primary: "true"
          - arch: arm64
            deb_arch: arm64
            runs_on: ubuntu-latest
            cross_compile: aarch64-linux-gnu-
            localversion: -bbrv3
            is_primary: "false"
    runs-on: ${{ matrix.runs_on }}
    env:
      ARCH: ${{ matrix.arch }}
      DEB_ARCH: ${{ matrix.deb_arch }}
      KERNEL_VERSION: ${{ needs.preflight.outputs.kernel_version }}
      PKG_TOKEN: ${{ secrets.PKG_TOKEN }}
    steps:
      - name: 检出代码
        uses: actions/checkout@v4

      - name: 检查 registry 是否已发布
        id: check_present
        run: |
          set -euo pipefail
          if bash scripts/registry-has-all.sh "$PKG_REGISTRY" stable main "$KERNEL_VERSION" "$DEB_ARCH"; then
            echo "BUILD_NEEDED=false" >> "$GITHUB_ENV"
            echo "Full artifact set for $KERNEL_VERSION ($DEB_ARCH) present; skipping."
          else
            echo "BUILD_NEEDED=true" >> "$GITHUB_ENV"
            echo "Artifact set for $KERNEL_VERSION ($DEB_ARCH) incomplete; building."
          fi

      - name: 安装依赖项
        if: env.BUILD_NEEDED == 'true'
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            git build-essential \
            libncurses-dev libssl-dev libelf-dev \
            bison bc flex rsync debhelper \
            dpkg-dev fakeroot kmod cpio dwarves \
            libdw-dev lz4 zstd xz-utils curl jq

      - name: 安装 ARM64 交叉编译工具链
        if: env.BUILD_NEEDED == 'true' && matrix.arch == 'arm64'
        run: |
          sudo apt-get install -y gcc-aarch64-linux-gnu

      - name: 配置 ccache
        if: env.BUILD_NEEDED == 'true'
        run: |
          set -euo pipefail
          sudo apt-get install -y ccache
          # Wrap the (cross-)compilers through /usr/lib/ccache symlinks; the build
          # picks them up because this dir is prepended to PATH below.
          sudo update-ccache-symlinks || true
          ccache_bin="$(command -v ccache)"
          sudo ln -sf "$ccache_bin" /usr/lib/ccache/gcc
          if [ "$ARCH" = "arm64" ]; then
            sudo ln -sf "$ccache_bin" /usr/lib/ccache/aarch64-linux-gnu-gcc
          fi
          echo "/usr/lib/ccache" >> "$GITHUB_PATH"
          {
            echo "CCACHE_DIR=$HOME/.ccache"
            echo "CCACHE_MAXSIZE=8G"
            echo "CCACHE_COMPRESS=1"
          } >> "$GITHUB_ENV"

      - name: 恢复 ccache 缓存
        if: env.BUILD_NEEDED == 'true'
        uses: actions/cache/restore@v4
        with:
          # Only the compiler cache is worth persisting: the kernel source is
          # re-cloned each run and out/ holds freshly built packages. A unique key
          # per run forces a fresh save; restore-keys warm-start from the most recent
          # prior build of the same arch (then any build of the same arch). Restore
          # and save are split (not the combined actions/cache) because that action's
          # post-save is gated by post-if: success() — a failed publish would discard
          # the whole compile cache. The matching save runs right after the build.
          path: ~/.ccache
          key: ccache-${{ matrix.arch }}-${{ needs.preflight.outputs.kernel_version }}-${{ github.run_id }}
          restore-keys: |
            ccache-${{ matrix.arch }}-${{ needs.preflight.outputs.kernel_version }}-
            ccache-${{ matrix.arch }}-

      - name: 创建源码目录
        if: env.BUILD_NEEDED == 'true'
        run: mkdir -p ./kernel/linux

      - name: 下载内核源代码
        if: env.BUILD_NEEDED == 'true'
        working-directory: ./kernel
        run: |
          branch=$(echo "$KERNEL_VERSION" | grep -oP '^\d+\.\d+')
          git clone --depth=1 --branch linux-$branch.y \
            https://github.com/gregkh/linux.git linux

      - name: 应用 BBRv3 补丁
        if: env.BUILD_NEEDED == 'true'
        working-directory: ./kernel/linux
        run: |
          bash "$GITHUB_WORKSPACE/scripts/apply-bbrv3-port.sh"
          grep -n "BBR_VERSION" net/ipv4/tcp_bbr.c

      - name: 更新 Makefile 中的版本号
        if: env.BUILD_NEEDED == 'true'
        working-directory: ./kernel/linux
        run: |
          IFS='.' read -r v p s <<< "$KERNEL_VERSION"
          sed -i "s/^VERSION *=.*/VERSION = $v/" Makefile
          sed -i "s/^PATCHLEVEL *=.*/PATCHLEVEL = $p/" Makefile
          sed -i "s/^SUBLEVEL *=.*/SUBLEVEL = $s/" Makefile

      - name: 准备 .config 并禁用证书检查
        if: env.BUILD_NEEDED == 'true'
        timeout-minutes: 8
        working-directory: ./kernel/linux
        env:
          TARGET_ARCH: ${{ matrix.arch }}
          CROSS_COMPILE: ${{ matrix.cross_compile }}
        run: |
          bash "$GITHUB_WORKSPACE/scripts/prepare-kernel-config.sh" "$TARGET_ARCH"

      - name: 构建内核 Debian 包
        if: env.BUILD_NEEDED == 'true'
        working-directory: ./kernel/linux
        env:
          TARGET_ARCH: ${{ matrix.arch }}
          LOCALVERSION_SUFFIX: ${{ matrix.localversion }}
          CROSS_COMPILE: ${{ matrix.cross_compile }}
        run: |
          if [ "$TARGET_ARCH" = "arm64" ]; then
            # Drop the linux-headers package on the arm64 cross build: with
            # CONFIG_MODULE_SIG_FORMAT=y its packaging cross-compiles scripts/sign-file
            # and would need arm64 OpenSSL dev headers (libssl-dev:arm64) we don't
            # install. nokernelheaders is the kernel maintainers' documented remedy.
            DEB_BUILD_PROFILES=pkg.linux-upstream.nokernelheaders \
              make ARCH=arm64 CROSS_COMPILE="$CROSS_COMPILE" bindeb-pkg -j$(nproc) LOCALVERSION="$LOCALVERSION_SUFFIX" KDEB_COMPRESS=gzip skipdbg=true
          else
            make bindeb-pkg -j$(nproc) LOCALVERSION="$LOCALVERSION_SUFFIX" KDEB_COMPRESS=gzip skipdbg=true
          fi

      - name: ccache 统计
        if: env.BUILD_NEEDED == 'true'
        run: ccache -s

      - name: 保存 ccache 缓存
        # Save even when a later step fails: the compiler cache is valid the moment
        # the build finishes, so a downstream failure (e.g. the registry upload) must
        # not discard it. !cancelled() = save on success or failure, but skip
        # cancellations (cancel-in-progress) so half-built runs don't bloat the cache.
        # Key matches the restore step's primary key above.
        if: ${{ !cancelled() && env.BUILD_NEEDED == 'true' }}
        uses: actions/cache/save@v4
        with:
          path: ~/.ccache
          key: ccache-${{ matrix.arch }}-${{ needs.preflight.outputs.kernel_version }}-${{ github.run_id }}

      - name: 检查 deb 包
        if: env.BUILD_NEEDED == 'true'
        run: |
          if find ./kernel -maxdepth 1 \( -name '*-dbg*.deb' -o -name '*-dbgsym*.deb' \) | grep -q .; then
            echo "ERROR: debug deb package was generated."
            find ./kernel -maxdepth 1 \( -name '*-dbg*.deb' -o -name '*-dbgsym*.deb' \) -print
            exit 1
          fi
          find ./kernel -maxdepth 1 -name 'linux-*.deb' -print | sort

      - name: 构建 meta 与 config 包
        if: env.BUILD_NEEDED == 'true'
        env:
          IS_PRIMARY: ${{ matrix.is_primary }}
        run: |
          set -euo pipefail
          mkdir -p ./out

          # Depend on the *actual* image package name, immune to localversion drift.
          img_deb=$(find ./kernel -maxdepth 1 -name 'linux-image-*.deb' ! -name '*-dbg*' | sort | head -n1)
          if [ -z "$img_deb" ]; then
            echo "No linux-image .deb found to base the meta-package on." >&2
            exit 1
          fi
          img_pkg=$(dpkg-deb -f "$img_deb" Package)
          echo "Kernel image package: $img_pkg"

          bash scripts/build-meta-package.sh "$KERNEL_VERSION" "$DEB_ARCH" "$img_pkg" ./out

          # bbrv3-config is Architecture:all; build it once (on the primary arch).
          if [ "$IS_PRIMARY" = "true" ]; then
            bash scripts/build-config-package.sh ./out
          fi

      - name: 发布前复查是否已发布
        if: env.BUILD_NEEDED == 'true'
        run: |
          set -euo pipefail
          if bash scripts/registry-has-all.sh "$PKG_REGISTRY" stable main "$KERNEL_VERSION" "$DEB_ARCH"; then
            echo "PUBLISH_NEEDED=false" >> "$GITHUB_ENV"
            echo "Full set published while this job was running; skipping upload."
          else
            echo "PUBLISH_NEEDED=true" >> "$GITHUB_ENV"
            echo "Set still incomplete; publishing this build."
          fi

      - name: 发布到 Gitea Debian registry
        if: env.BUILD_NEEDED == 'true' && env.PUBLISH_NEEDED == 'true'
        run: |
          set -euo pipefail
          if [ -z "${PKG_TOKEN:-}" ]; then
            echo "PKG_TOKEN secret is required to publish (needs write:package scope)." >&2
            exit 1
          fi

          # The kernel image .deb is >100 MB, which trips the request-body cap of a
          # CDN/proxy in front of the registry (Cloudflare free/pro = 100 MB) and 413s
          # at the edge before the body reaches Gitea — the origin itself accepts it.
          # If PKG_ORIGIN_IP is set, pin the upload straight to that origin so the
          # oversized PUT never touches the CDN. SNI/Host stay $reg_host, so TLS and
          # package routing are unchanged; only the TCP connect target moves.
          reg_host=${PKG_REGISTRY#*://}; reg_host=${reg_host%%/*}
          resolve=()
          if [ -n "${PKG_ORIGIN_IP:-}" ]; then
            resolve=(--resolve "${reg_host}:443:${PKG_ORIGIN_IP}")
            echo "Uploading direct to origin ${PKG_ORIGIN_IP}, bypassing any CDN in front of ${reg_host}."
          else
            echo "PKG_ORIGIN_IP unset: uploading via DNS for ${reg_host}; if a CDN fronts it (e.g. Cloudflare, 100 MB cap) the kernel image will 413. Set the PKG_ORIGIN_IP variable to fix." >&2
          fi

          # Gitea returns 201/202 on upload, 409 when the file already exists.
          upload() {
            local f="$1" code
            code=$(curl -sS -o /dev/null -w '%{http_code}' "${resolve[@]}" \
              --user "$PKG_USER:$PKG_TOKEN" --upload-file "$f" \
              "$PKG_REGISTRY/pool/stable/main/upload" || echo 000)
            case "$code" in
              201|202) echo "Uploaded $(basename "$f") ($code)";;
              409) echo "Already present $(basename "$f") (409)";;
              *) echo "Upload failed: $(basename "$f") (HTTP $code)" >&2; return 1;;
            esac
          }

          shopt -s nullglob
          # Publish the kernel image and (x86_64) headers, plus the meta/config
          # packages. Never linux-libc-dev (clashes with the distro's userspace
          # headers) and never *-dbg* packages.
          assets=()
          for f in ./kernel/linux-image-*.deb ./kernel/linux-headers-*.deb; do
            case "$f" in *-dbg*) continue;; esac
            assets+=("$f")
          done
          assets+=( ./out/*.deb )

          if [ ${#assets[@]} -eq 0 ]; then
            echo "No .deb assets found to upload." >&2
            exit 1
          fi

          for f in "${assets[@]}"; do
            echo "Publishing $(basename "$f")"
            upload "$f"
          done
          echo "Published ${#assets[@]} package(s) for $KERNEL_VERSION ($DEB_ARCH)."