tweag/rules_nixpkgs

nix remote jobs are not working correctly on CI

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avdv commented

Describe the bug

I noticed that the nix remote CI jobs (withNixRemote = true) actually don't run remotely since the NIX_REMOTE_ENABLED variable which is checked here:

rules_nixpkgs/.github/workflows/workflow.yaml

Lines 60 to 63 in c1afab1

if [ "$NIX_REMOTE_ENABLED" = "true" ]; then
echo "Setting BAZEL_NIX_REMOTE env variable"
export BAZEL_NIX_REMOTE=nix-server
fi

is actually set to matrix.withNixRemote && matrix.os == 'ubuntu-latest' verbatim, so the condition is never true.

After fixing that problem (see 5046b7d), the jobs fail with:

       Return code: 1
      Error output: 
        > warning: unknown setting 'always-allow-substitutes'
        > ssh: connect to host localhost port 2222: Connection refused
        > error: failed to start SSH connection to 'nix-server'

See https://github.com/tweag/rules_nixpkgs/actions/runs/9875397903/job/27271997561

To Reproduce

Expected behavior
CI jobs should be able to use the nix server that is started inside a Docker container.

Environment

  • OS name + version: ubuntu-latest
  • Version of the code:

Additional context
I am going to disable the jobs for now. @z8v could you have a look to see what's going on?