使用 GitHub Actions 进行可重现构建

SOURCE_DATE_EPOCH 是一个标准化环境变量用于指导构建工具生成可重现的输出。为构建设置环境变量会使镜像索引、配置和文件元数据中的时间戳反映指定的 Unix 时间。

要在 GitHub Actions 中设置环境变量，请在构建步骤上使用内置的 env 属性。

Unix时间戳

以下示例将 SOURCE_DATE_EPOCH 变量设置为 0，即 Unix 时间戳起点。

name: ci

on:
  push:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Build
        uses: docker/build-push-action@v6
        with:
          tags: user/app:latest
        env:
          SOURCE_DATE_EPOCH: 0

name: ci

on:
  push:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Build
        uses: docker/bake-action@v5
        env:
          SOURCE_DATE_EPOCH: 0

Git 提交时间戳

以下示例将 SOURCE_DATE_EPOCH 设置为 Git 提交时间戳。

name: ci

on:
  push:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Get Git commit timestamps
        run: echo "TIMESTAMP=$(git log -1 --pretty=%ct)" >> $GITHUB_ENV

      - name: Build
        uses: docker/build-push-action@v6
        with:
          tags: user/app:latest
        env:
          SOURCE_DATE_EPOCH: ${{ env.TIMESTAMP }}

name: ci

on:
  push:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Get Git commit timestamps
        run: echo "TIMESTAMP=$(git log -1 --pretty=%ct)" >> $GITHUB_ENV

      - name: Build
        uses: docker/bake-action@v5
        env:
          SOURCE_DATE_EPOCH: ${{ env.TIMESTAMP }}

附加信息

有关 BuildKit 中 SOURCE_DATE_EPOCH 支持的详细信息，请参阅 BuildKit 文档。