[WIP] CI: use BuildKit Docker layer caching

.github/workflows/ci.yml

@@ -42,6 +42,7 @@ jobs:
       CI_JOB_NAME: "${{ matrix.name }}"
       CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
       HEAD_SHA: "${{ github.event.pull_request.head.sha || github.sha }}"
+      DOCKER_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
       SCCACHE_BUCKET: rust-lang-ci-sccache2
       TOOLSTATE_REPO: "https://github.com/rust-lang-nursery/rust-toolstate"
       CACHE_DOMAIN: ci-caches.rust-lang.org
@@ -50,19 +51,10 @@ jobs:
     strategy:
       matrix:
         include:
-          - name: mingw-check
-            os: ubuntu-20.04-4core-16gb
-            env: {}
-          - name: mingw-check-tidy
-            os: ubuntu-20.04-4core-16gb
-            env: {}
-          - name: x86_64-gnu-llvm-16
+          - name: quick
             env:
               ENABLE_GCC_CODEGEN: "1"
-            os: ubuntu-20.04-16core-64gb
-          - name: x86_64-gnu-tools
-            os: ubuntu-20.04-16core-64gb
-            env: {}
+            os: ubuntu-20.04
     timeout-minutes: 600
     runs-on: "${{ matrix.os }}"
     steps:
@@ -168,10 +160,13 @@ jobs:
         if: "success() && !env.SKIP_JOB && (github.event_name == 'push' || env.DEPLOY == '1' || env.DEPLOY_ALT == '1')"
   auto:
     name: "auto - ${{ matrix.name }}"
+    permissions:
+      packages: write
     env:
       CI_JOB_NAME: "${{ matrix.name }}"
       CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
       HEAD_SHA: "${{ github.event.pull_request.head.sha || github.sha }}"
+      DOCKER_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
       SCCACHE_BUCKET: rust-lang-ci-sccache2
       DEPLOY_BUCKET: rust-lang-ci2
       TOOLSTATE_REPO: "https://github.com/rust-lang-nursery/rust-toolstate"
@@ -204,7 +199,7 @@ jobs:
             os: ubuntu-20.04-8core-32gb
             env: {}
           - name: dist-arm-linux
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
             env: {}
           - name: dist-armhf-linux
             os: ubuntu-20.04-8core-32gb
@@ -251,12 +246,12 @@ jobs:
           - name: dist-x86_64-linux
             env:
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
           - name: dist-x86_64-linux-alt
             env:
               IMAGE: dist-x86_64-linux
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
           - name: dist-x86_64-musl
             env:
               CODEGEN_BACKENDS: "llvm,cranelift"
@@ -291,7 +286,7 @@ jobs:
           - name: x86_64-gnu-integration
             env:
               CI_ONLY_WHEN_CHANNEL: nightly
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
           - name: x86_64-gnu-debug
             os: ubuntu-20.04-8core-32gb
             env: {}
@@ -561,11 +556,14 @@ jobs:
         if: "success() && !env.SKIP_JOB && (github.event_name == 'push' || env.DEPLOY == '1' || env.DEPLOY_ALT == '1')"
   try:
     name: "try - ${{ matrix.name }}"
+    permissions:
+      packages: write
     env:
       DIST_TRY_BUILD: 1
       CI_JOB_NAME: "${{ matrix.name }}"
       CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
       HEAD_SHA: "${{ github.event.pull_request.head.sha || github.sha }}"
+      DOCKER_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
       SCCACHE_BUCKET: rust-lang-ci-sccache2
       DEPLOY_BUCKET: rust-lang-ci2
       TOOLSTATE_REPO: "https://github.com/rust-lang-nursery/rust-toolstate"
@@ -579,10 +577,10 @@ jobs:
     strategy:
       matrix:
         include:
-          - name: dist-x86_64-linux
+          - name: quick
             env:
               CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04
     timeout-minutes: 600
     runs-on: "${{ matrix.os }}"
     steps:

src/ci/docker/host-x86_64/quick/Dockerfile

@@ -0,0 +1,36 @@
+FROM ubuntu:23.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  make \
+  file \
+  curl \
+  ca-certificates \
+  python3 \
+  git && rm -rf /var/lib/apt/lists/*
+
+# Note: libgccjit needs to match the default gcc version for the linker to find it.
+
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+# We are disabling CI LLVM since this builder is intentionally using a host
+# LLVM, rather than the typical src/llvm-project LLVM.
+ENV NO_DOWNLOAD_CI_LLVM 1
+
+# This is not the latest LLVM version, so some components required by tests may
+# be missing.
+ENV IS_NOT_LATEST_LLVM 1
+
+# Using llvm-link-shared due to libffi issues -- see #34486
+ENV RUST_CONFIGURE_ARGS \
+      --build=x86_64-unknown-linux-gnu \
+      --llvm-root=/usr/lib/llvm-16 \
+      --enable-llvm-link-shared \
+      --set rust.thin-lto-import-instr-limit=10
+
+COPY host-x86_64/x86_64-gnu-llvm-16/script.sh /tmp/
+
+ENV SCRIPT /tmp/script.sh

src/ci/docker/run.sh

@@ -74,25 +74,6 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
 
       cksum=$(sha512sum $hash_key | \
         awk '{print $1}')
-
-      url="https://$CACHE_DOMAIN/docker/$cksum"
-
-      echo "Attempting to download $url"
-      rm -f /tmp/rustci_docker_cache
-      set +e
-      retry curl --max-time 600 -y 30 -Y 10 --connect-timeout 30 -f -L -C - \
-        -o /tmp/rustci_docker_cache "$url"
-
-      docker_archive_hash=$(sha512sum /tmp/rustci_docker_cache | awk '{print $1}')
-      echo "Downloaded archive hash: ${docker_archive_hash}"
-
-      echo "Loading images into docker"
-      # docker load sometimes hangs in the CI, so time out after 10 minutes with TERM,
-      # KILL after 12 minutes
-      loaded_images=$(/usr/bin/timeout -k 720 600 docker load -i /tmp/rustci_docker_cache \
-        | sed 's/.* sha/sha/')
-      set -e
-      printf "Downloaded containers:\n$loaded_images\n"
     fi
 
     dockerfile="$docker_dir/$image/Dockerfile"
@@ -103,44 +84,48 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
         context="$script_dir"
     fi
     echo "::group::Building docker image for $image"
-
-    # As of August 2023, Github Actions have updated Docker to 23.X,
-    # which uses the BuildKit by default. It currently throws aways all
-    # intermediate layers, which breaks our usage of S3 layer caching.
-    # Therefore we opt-in to the old build backend for now.
-    export DOCKER_BUILDKIT=0
-    retry docker \
-      build \
-      --rm \
-      -t rust-ci \
-      -f "$dockerfile" \
-      "$context"
+    echo "Image checksum ${cksum}"
+
+    # On PR jobs, we don't have permissions to write to the cache, so we should not use
+    # `docker login` nor caching.
+    if [ "$PR_CI_JOB" -eq 1 ]
+    then
+         docker pull ghcr.io/rust-lang-ci/rust-ci:e933e07d88a3a99bf4260cfb60899ada91f8df72a6588179fcf65ebe7ce824675eb8f2c985515ca3c51f2d0f5c006cb1d9e2fa66af562cdc91537385af559d59
+#        docker buildx create --use --driver docker-container
+#        retry docker buildx build --rm -t rust-ci \
+#            --output=type=docker \
+#            --cache-from type=registry,ref=ghcr.io/rust-lang-ci/rust-ci:${cksum} \
+#            -f "$dockerfile" "$context"
+    else
+        docker pull ghcr.io/rust-lang-ci/rust-ci:e933e07d88a3a99bf4260cfb60899ada91f8df72a6588179fcf65ebe7ce824675eb8f2c985515ca3c51f2d0f5c006cb1d9e2fa66af562cdc91537385af559d59
+
+        docker buildx create --use --driver docker-container
+
+        # Login to Docker registry
+        echo ${DOCKER_TOKEN} | docker login ghcr.io --username rust-lang-ci --password-stdin
+
+        dest="type=registry,ref=ghcr.io/rust-lang-ci/rust-ci:${cksum},compression=zstd,mode=max"
+
+        retry docker \
+              buildx \
+              build \
+              --rm \
+              -t rust-ci \
+              -f "$dockerfile" \
+              --cache-from type=registry,ref=ghcr.io/rust-lang-ci/rust-ci:${cksum} \
+              --cache-to ${dest} \
+              --output=type=docker \
+              "$context"
+        docker manifest inspect rust-ci
+    fi
     echo "::endgroup::"
 
     if [ "$CI" != "" ]; then
-      s3url="s3://$SCCACHE_BUCKET/docker/$cksum"
-      upload="aws s3 cp - $s3url"
       digest=$(docker inspect rust-ci --format '{{.Id}}')
-      echo "Built container $digest"
-      if ! grep -q "$digest" <(echo "$loaded_images"); then
-        echo "Uploading finished image $digest to $url"
-        set +e
-        # Print image history for easier debugging of layer SHAs
-        docker history rust-ci
-        docker history -q rust-ci | \
-          grep -v missing | \
-          xargs docker save | \
-          gzip | \
-          $upload
-        set -e
-      else
-        echo "Looks like docker image is the same as before, not uploading"
-      fi
       # Record the container image for reuse, e.g. by rustup.rs builds
       info="$dist/image-$image.txt"
       mkdir -p "$dist"
-      echo "$url" >"$info"
-      echo "$digest" >>"$info"
+      echo "${cksum}" > "$info"
       cat "$info"
     fi
 elif [ -f "$docker_dir/disabled/$image/Dockerfile" ]; then

src/ci/github-actions/ci.yml

@@ -34,6 +34,7 @@ x--expand-yaml-anchors--remove:
     CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
     # commit of PR sha or commit sha. `GITHUB_SHA` is not accurate for PRs.
     HEAD_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
+    DOCKER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
   - &public-variables
     SCCACHE_BUCKET: rust-lang-ci-sccache2
@@ -84,7 +85,7 @@ x--expand-yaml-anchors--remove:
     <<: *base-job
 
   - &job-linux-16c
-    os: ubuntu-20.04-16core-64gb
+    os: ubuntu-20.04
     <<: *base-job
 
   - &job-macos-xl
@@ -328,23 +329,16 @@ jobs:
     strategy:
       matrix:
         include:
-          - name: mingw-check
-            <<: *job-linux-4c
-
-          - name: mingw-check-tidy
-            <<: *job-linux-4c
-
-          - name: x86_64-gnu-llvm-16
+          - name: quick
             env:
               ENABLE_GCC_CODEGEN: "1"
             <<: *job-linux-16c
 
-          - name: x86_64-gnu-tools
-            <<: *job-linux-16c
-
   auto:
     <<: *base-ci-job
     name: auto - ${{ matrix.name }}
+    permissions:
+      packages: write
     env:
       <<: [*shared-ci-variables, *prod-variables]
     if: github.event_name == 'push' && github.ref == 'refs/heads/auto' && github.repository == 'rust-lang-ci/rust'
@@ -725,6 +719,8 @@ jobs:
   try:
     <<: *base-ci-job
     name: try - ${{ matrix.name }}
+    permissions:
+      packages: write
     env:
       DIST_TRY_BUILD: 1
       <<: [*shared-ci-variables, *prod-variables]
@@ -733,7 +729,7 @@ jobs:
       matrix:
         include:
           - &dist-x86_64-linux
-            name: dist-x86_64-linux
+            name: quick
             env:
               CODEGEN_BACKENDS: llvm,cranelift
             <<: *job-linux-16c