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| 1 | +# Mirror DockerHub images used by the Rust project to ghcr.io. |
| 2 | +# Images are available at https://github.com/orgs/rust-lang/packages. |
| 3 | +# |
| 4 | +# In some CI jobs, we pull images from ghcr.io instead of Docker Hub because |
| 5 | +# Docker Hub has a rate limit, while ghcr.io doesn't. |
| 6 | +# Those images are pushed to ghcr.io by this job. |
| 7 | +# |
| 8 | +# Note that authenticating to DockerHub or other registries isn't possible |
| 9 | +# for PR jobs, because forks can't access secrets. |
| 10 | +# That's why we use ghcr.io: it has no rate limit and it doesn't require authentication. |
| 11 | + |
| 12 | +name: GHCR image mirroring |
| 13 | + |
| 14 | +on: |
| 15 | + workflow_dispatch: |
| 16 | + schedule: |
| 17 | + # Run daily at midnight UTC |
| 18 | + - cron: '0 0 * * *' |
| 19 | + |
| 20 | +jobs: |
| 21 | + mirror: |
| 22 | + name: DockerHub mirror |
| 23 | + runs-on: ubuntu-24.04 |
| 24 | + if: github.repository == 'rust-lang/rust' |
| 25 | + permissions: |
| 26 | + # Needed to write to the ghcr.io registry |
| 27 | + packages: write |
| 28 | + steps: |
| 29 | + - uses: actions/checkout@v4 |
| 30 | + with: |
| 31 | + persist-credentials: false |
| 32 | + |
| 33 | + - name: Log in to registry |
| 34 | + run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.repository_owner }} --password-stdin |
| 35 | + |
| 36 | + # Download crane in the current directory. |
| 37 | + # We use crane because it copies the docker image for all the architectures available in |
| 38 | + # DockerHub for the image. |
| 39 | + # Learn more about crane at |
| 40 | + # https://github.com/google/go-containerregistry/blob/main/cmd/crane/README.md |
| 41 | + - name: Download crane |
| 42 | + run: | |
| 43 | + curl -sL "https://github.com/google/go-containerregistry/releases/download/${VERSION}/go-containerregistry_${OS}_${ARCH}.tar.gz" | tar -xzf - |
| 44 | + env: |
| 45 | + VERSION: v0.20.2 |
| 46 | + OS: Linux |
| 47 | + ARCH: x86_64 |
| 48 | + |
| 49 | + - name: Mirror DockerHub |
| 50 | + run: | |
| 51 | + # List of DockerHub images to mirror to ghcr.io |
| 52 | + images=( |
| 53 | + # Mirrored because used by the mingw-check-tidy, which doesn't cache Docker images |
| 54 | + "ubuntu:22.04" |
| 55 | + # Mirrored because used by all linux CI jobs, including mingw-check-tidy |
| 56 | + "moby/buildkit:buildx-stable-1" |
| 57 | + ) |
| 58 | +
|
| 59 | + # Mirror each image from DockerHub to ghcr.io |
| 60 | + for img in "${images[@]}"; do |
| 61 | + echo "Mirroring ${img}..." |
| 62 | + # Remove namespace from the image if any. |
| 63 | + # E.g. "moby/buildkit:buildx-stable-1" becomes "buildkit:buildx-stable-1" |
| 64 | + dest_image=$(echo "${img}" | cut -d'/' -f2-) |
| 65 | + ./crane copy \ |
| 66 | + "docker.io/${img}" \ |
| 67 | + "ghcr.io/${{ github.repository_owner }}/${dest_image}" |
| 68 | + done |
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