Remove some references to perl.

docs/source/dev/README.rst

@@ -36,7 +36,7 @@ It is also possible go through the testing script interactively - useful for deb
 
 This will give you a result symlink in the current directory.
 Inside that is bin/nixos-test-driver which gives you a kind of REPL for interacting with the VMs.
-The kind of `Perl in this testScript <https://github.com/PrivateStorageio/PrivateStorageio/blob/78881a3/nixos/modules/tests/private-storage.nix#L180>`_ is what you can enter into this REPL.
+The kind of `Python in this testScript <https://github.com/PrivateStorageio/PrivateStorageio/blob/78881a3/nixos/modules/tests/private-storage.nix#L180>`_ is what you can enter into this REPL.
 Consult the `official documentation on NixOS Tests <https://nixos.org/manual/nixos/stable/index.html#sec-nixos-tests>`_ for more information.
 
 Architecture overview
@@ -48,8 +48,5 @@ Architecture overview
 .. include::
       ../../../morph/grid/local/README.rst
 
-
-
-
 .. _Nix: https://nixos.org/nix
 

nixos/modules/tests/private-storage.nix

@@ -14,7 +14,7 @@ let
     "ssh" "-oStrictHostKeyChecking=no" "-i" "/tmp/ssh_key" "${username}@${hostname}" ":"
   ];
 
-  # Separate helper programs so we can write as little perl inside a string
+  # Separate helper programs so we can write as little python inside a string
   # inside a nix expression as possible.
   run-introducer = ./run-introducer.py;
   run-client = ./run-client.py;
@@ -72,11 +72,11 @@ let
     networking.dhcpcd.enable = false;
   };
 
-  # Return a Perl program fragment to run a shell command on one of the nodes.
+  # Return a python program fragment to run a shell command on one of the nodes.
   # The first argument is the name of the node.  The second is a list of the
   # argv to run.
   #
-  # The program's output is piped to systemd-cat and the Perl fragment
+  # The program's output is piped to systemd-cat and the python fragment
   # evaluates to success if the command exits with a success status.
   runOnNode = node: argv:
     let