Nix flake configuration for my various machines (clients and homelab servers)
ci falls back to source build when cache.sub0.net is down
Parthiv Krishna
(Jun 21, 2026, 9:49 PM -0700)
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.github/workflows/nixos-build.yaml
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.github/workflows/nixos-build.yaml
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extra-conf: |
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build-dir = /nix/build
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extra-platforms = aarch64-linux
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extra-substituters = https://cache.flox.dev?priority=30 ssh-ng://nix-cache@cache.sub0.net?priority=50
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extra-trusted-public-keys = flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs= cache.sub0.net-1:x8wTeYCstMWT0jwzccBr3IT8V2DXqRKu8k/KUv5nW4Q=
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extra-substituters = https://cache.flox.dev?priority=30
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extra-trusted-public-keys = flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs=
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fallback = true
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connect-timeout = 5
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- name: Load SSH private key for secrets repo
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uses: webfactory/ssh-agent@v0.9.0
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with:
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hostname: ci-${{ matrix.host }}-${{ github.run_id }}
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- name: Build configuration
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run: |
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nix build --no-link .#nixosConfigurations.${{ matrix.host }}.config.system.build.toplevel
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nix build --fallback --no-link .#nixosConfigurations.${{ matrix.host }}.config.system.build.toplevel
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- name: Push to cache
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continue-on-error: true
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run: |
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path=$(nix path-info .#nixosConfigurations.${{ matrix.host }}.config.system.build.toplevel)
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nix copy --to ssh-ng://nix-cache@cache.sub0.net $path
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nix copy --to ssh-ng://nix-cache@cache.sub0.net "$path"
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ssh nix-cache@cache.sub0.net "nix-store --add-root /nix/var/nix/gcroots/cache/${{ matrix.host }} -r $path"