🌅

.github/workflows/build.yaml

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+name: Spack buildcache build
+
+on: push
+
+env:
+  SPACK_COLOR: always
+  SPACK_BACKTRACE: please
+
+jobs:
+  example:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Spack
+        run: |
+          git clone --depth=1 https://github.com/spack/spack.git
+          echo "$PWD/spack/bin/" >> "$GITHUB_PATH"
+
+      - name: Concretize
+        run: spack -e . concretize
+
+      - name: Install
+        run: spack -e . install -j $(($(nproc) + 1)) --no-check-signature --fail-fast
+
+      - name: Push packages and update index
+        run: |
+          spack -e . mirror set --push --oci-username haampie --oci-password "${{ secrets.GITHUB_TOKEN }}" spack-buildcache
+          spack -e . buildcache push -j $(($(nproc) + 1)) --base-image ubuntu:22.04 --unsigned --update-index spack-buildcache
+        if: always()

README.md

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+# Spack buildcache for Github Actions
+
+This repo provides a buildcache to speed up Spack in your Github Actions.
+
+Currently it provides binaries for `%gcc@12 os=ubuntu22.04 target=x86_64_v2`
+
+To use it, add an environment `spack.yaml` to the root of your own repository
+
+```yaml
+spack:
+  view: my_view
+  specs:
+  - [email protected]
+
+  packages:
+    all:
+      require: '%gcc@12 target=x86_64_v2'
+
+  mirrors:
+    spack-buildcache: oci://ghcr.io/haampie/spack-buildcache
+```
+
+and Spack install it in a Github Action:
+
+```yaml
+name: Build
+
+on: push
+
+env:
+  SPACK_COLOR: always
+  SPACK_BACKTRACE: please
+
+jobs:
+  example:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Spack
+        run: |
+          git clone --depth=1 https://github.com/spack/spack.git
+          echo "$PWD/spack/bin/" >> "$GITHUB_PATH"
+
+      - name: Concretize
+        run: spack -e . concretize
+
+      - name: Install
+        run: spack -e . install --no-check-signature
+
+      - name: Run
+        run: ./my_view/bin/python -c 'print("hello world")'
+```
+
+## Caching your own binaries
+
+If you want to cache your own binaries too, add an additional mirror to your
+environment config:
+
+```yaml
+spack:
+
+  ...
+
+  mirrors:
+    spack-buildcache: oci://ghcr.io/haampie/spack-buildcache
+    local-buildcache: oci://ghcr.io/<username>/spack-buildcache
+```
+
+and push the environment's binaries to the local buildcache:
+
+```yaml
+jobs:
+  exampe:
+    steps:
+      ...
+      - name: Push packages and update index
+        run: |
+          spack -e . mirror set --push --oci-username <username> --oci-password "${{ secrets.GITHUB_TOKEN }}" local-buildcache
+          spack -e . buildcache push -j $(nproc) --base-image ubuntu:22.04 --unsigned --update-index local-buildcache
+```

spack.yaml

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+spack:
+  specs:
+  - autoconf
+  - automake
+  - bison
+  - cmake
+  - flex
+  - git
+  - libtool
+  - m4
+  - meson
+  - ninja
+  - perl
+  - [email protected]
+  view: false
+  concretizer:
+    unify: false
+  packages:
+    all:
+      require: '%gcc@12 target=x86_64_v2'
+  mirrors:
+    spack-buildcache: oci://ghcr.io/haampie/spack-buildcache