nixosTests.netdata: port to python

[Br1ght0ne]

Motivation for this change

#72828

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Notify maintainers

cc @cransom

---

This change is 

[flokli]

This multiline command looks kinda scary, and it seems it also doesn't work:

netdata # > > parse error: Invalid numeric literal at line 1, column 6
netdata # > > parse error: Invalid numeric literal at line 1, column 6
netdata # > > parse error: Invalid numeric literal at line 1, column 6
netdata # > > parse error: Invalid numeric literal at line 1, column 6
netdata # > > parse error: Invalid numeric literal at line 1, column 6
netdata # > > parse error: Invalid numeric literal at line 1, column 6

[Br1ght0ne]

@flokli I hope I fixed it. Thanks for the help!

[flokli]

@GrahamcOfBorg test netdata

[Br1ght0ne]

@flokli I think it's still a problem. Tried to debug manually with nix-build netdata.nix -A driver - this command worked just fine. Maybe it's still a quoting issue?

[Lassulus]

if I run the test and log the response of the curl with:

netdata.wait_until_succeeds(f"curl -v {url} >&2")

I get this response:

netdata # *   Trying ::1:19999...
netdata # * TCP_NODELAY set
netdata # * Connected to localhost (::1) port 19999 (#0)
netdata # > GET /api/v1/data?chart=users.pwrites HTTP/1.1
netdata # > Host: localhost:19999
netdata # > User-Agent: curl/7.67.0
netdata # > Accept: */*
netdata # >
netdata # * Mark bundle as not supporting multiuse
netdata # < HTTP/1.1 404 Not Found
netdata # < Connection: close
netdata # < Server: NetData Embedded HTTP Server v1.18.1
netdata # < Access-Control-Allow-Origin: *
netdata # < Access-Control-Allow-Credentials: true
netdata # < Content-Type: text/plain; charset=utf-8
netdata # < Date: Thu, 28 Nov 2019 21:11:02 GMT
netdata # < Cache-Control: no-cache, no-store, must-revalidate
netdata # < Pragma: no-cache
netdata # < Expires: Thu, 28 Nov 2019 21:11:03 GMT
netdata # < Content-Length: 33
netdata # <
netdata # * Closing connection 0

EDIT: actually it works after a couple of retries, just as the test tries it again a couple of times

[Lassulus]

tested with nix-review and nix-build.