7 lines
539 B
Markdown
7 lines
539 B
Markdown
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# Notes for running the tests
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The VM tests do Nix builds inside the VMs, so they have writable Nix stores.
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Writable Nix stores in NixOS VM tests are, by default, tmpfs, but to speed up IO for the in-VM `nixos-rebuild`s, `./module-allow-rebuild-in-vm.nix` instead sets `virtualisation.writableStoreUseTmpfs = false;`, and allocates a much larger root filesystem for the VM.
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Specifically, each VM test allocates 20 GiB.
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If you are running low on disk space, disable `virtualisation.writableStoreUseTmpfs` in `./module-allow-rebuild-in-vm`.
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