Demonstrate nixos-tests #14
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Remove Cargo.lock from .gitignore, too
There are quite a few finer detailed points worth exploring. * Ignoring .git and nix directories, as well as any gitignored files ensures that the null-db binary is not built more than necessary when iterating in development. * RUSTC_BOOTSTRAP is a workaround - you can use an unstable toolchain if you want to using some other overlay or something, but caveat emptor. * The layout with a default.nix in the top-level directory is a personal idiom, not exactly worldwide. I like to expose the whole package set from the top-level and use the --attr flag to access things in there.
The module includes a null-db service with argv and firewall options. Argv is made a freeform type to allow future flags not to require new options.
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This ensures the diagnostic is printed at program start rather than on exit. Successful exit is almost guaranteed to never happen.
Otherwise elections never happen
This is meant for use with `nix-shell` in the project root or `nix-shell /path/to/project/root`
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After obtaining nix on linux (macOS is possible, but quite a bit of work) you can run these tests and explore.
nix repl --file /path/to/null-db- inspect nixpkgs and evaluate nix expressionsnix-shell /path/to/null-db- jump into a dev environment with the tools used to build null-dbnix-build /path/to/null-db --attr null-db- build the null-db in nix and create a symlink to the result in./resultnix-build /path/to/null-db --attr null-db.tests.basic-raft- run a basic nixos-test (currently failing). If it succeeds then a symlink will be created in./result$(nix-build --no-out-link --attr null-db.tests.basic-raft.driverInteractive)/bin/nixos-test-driver- build and enter a python repl where you can run the vms and test script or otherwise interact with the nixos test environment (no./resultcreated because of--no-out-link)Best reviewed per-commit.