OpenSSL "unregistered scheme" in GitHub workflow (from git clone)

[akaihola]

In this Linux build for the Graylint repository, as well as in the corresponding macOS build, when pip tries to use git clone to get a source tree, I get this error:

Collecting darkgraylib@ git+https://github.com/akaihola/darkgraylib.git@main (from graylint==0.0.1)
  Cloning https://github.com/akaihola/darkgraylib.git (to revision main) to /run/user/1001/pip-install-dnkydxr_/darkgraylib_bbfcb20d93f844b6b422297e35bdf0b0
  Running command git clone --filter=blob:none --quiet https://github.com/akaihola/darkgraylib.git /run/user/1001/pip-install-dnkydxr_/darkgraylib_bbfcb20d93f844b6b422297e35bdf0b0
  fatal: unable to access 'https://github.com/akaihola/darkgraylib.git/': OpenSSL/3.0.9: error:16000069:STORE routines::unregistered scheme
  error: subprocess-exited-with-error
  
  × git clone --filter=blob:none --quiet https://github.com/akaihola/darkgraylib.git /run/user/1001/pip-install-dnkydxr_/darkgraylib_bbfcb20d93f844b6b422297e35bdf0b0 did not run successfully.
  │ exit code: 128
  ╰─> See above for output.
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

Maybe related to

• Always set NIX_SSL_CERT_FILE #145
• Configuring NIX_SSL_CERT_FILE for self-hosted Linux runners when needed #136

[akaihola]

I managed to work around the problem like so:

    steps:
      - uses: actions/checkout@v3
      - uses: cachix/install-nix-action@v22
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - name: Download wheel uploaded by the build-wheel job
        uses: actions/download-artifact@v3
      - name: Run tests in nix-shell
        run: |
          nix-shell \
            --pure \
            --run '
              python -m venv venv
              source venv/bin/activate
              cert_file=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
              export NIX_SSL_CERT_FILE=$cert_file
              pip install "${{needs.build-wheel.outputs.wheel-path}}[test]"
              pytest
            ' \
            ./default.nix

So NIX_SSL_CERT_FILE needed to be set inside the Nix shell environment.

I wonder if there's a more elegant way to make this work.