nixosTests.netdata: port to python

nixos/tests/netdata.nix

@@ -1,6 +1,6 @@
 # This test runs netdata and checks for data via apps.plugin
 
-import ./make-test.nix ({ pkgs, ...} : {
+import ./make-test-python.nix ({ pkgs, ...} : {
   name = "netdata";
   meta = with pkgs.stdenv.lib.maintainers; {
     maintainers = [ cransom ];
@@ -16,23 +16,22 @@ import ./make-test.nix ({ pkgs, ...} : {
     };
 
   testScript = ''
-    startAll;
+    start_all()
 
-    $netdata->waitForUnit("netdata.service");
+    netdata.wait_for_unit("netdata.service")
 
     # wait for the service to listen before sending a request
-    $netdata->waitForOpenPort(19999);
+    netdata.wait_for_open_port(19999)
 
     # check if the netdata main page loads.
-    $netdata->succeed("curl --fail http://localhost:19999/");
+    netdata.succeed("curl --fail http://localhost:19999/")
 
     # check if netdata can read disk ops for root owned processes.
     # if > 0, successful. verifies both netdata working and
     # apps.plugin has elevated capabilities.
-    my $cmd = <<'CMD';
-    curl -s http://localhost:19999/api/v1/data\?chart=users.pwrites | \
-       jq -e '[.data[range(10)][.labels | indices("root")[0]]] | add | . > 0'
-    CMD
-    $netdata->waitUntilSucceeds($cmd);
+    url = "http://localhost:19999/api/v1/data\?chart=users.pwrites"
+    filter = '[.data[range(10)][.labels | indices("root")[0]]] | add | . > 0'
+    cmd = f"curl -s {url} | jq -e '{filter}'"
+    netdata.wait_until_succeeds(cmd)
   '';
 })