nixos/duckdns: init module

[notthebee]

Description of changes

Added a Systemd service for updating DuckDNS domains

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[bjornfor]

Echoing the query string like this exposes the secret to all (unprivileged) processes on the system -- can we avoid that?

If not, please add a big warning in the option description.

[bjornfor]

You updated at the same time I commented 😀

However, the secret is still visible in process listings.

[bjornfor]

I think "curl -K ./secret_params.txt ..." where secret_params.txt contains lines of "-d key=value" is the way to go. "replace-secret" in nixpkgs might help with securely preparing the file. (Untested.)

[notthebee]

Used the -K parameter and some shell redirection to hide the secrets in the process list

[bjornfor]

Used the -K parameter and some shell redirection to hide the secrets in the process list

Thanks!

Please rebase / squash the commits and I can take another look. (I think those 11 commits are just fixups to the one "init" commit?)

[notthebee]

Used the -K parameter and some shell redirection to hide the secrets in the process list

Thanks!

Please rebase / squash the commits and I can take another look. (I think those 11 commits are just fixups to the one "init" commit?)

Done :)

[Scrumplex]

Apart from these small nit picks, LGTM

[notthebee]

@bjornfor @h7x4 Are there any other changes I should make before this can be merged?