As announced in the NixOS 22.11 release notes, 23.05 will switch NixOS
to using nsncd (a non-caching reimplementation in Rust) as NSS lookup
dispatcher, instead of the buggy and deprecated glibc-provided nscd.
If you need to switch back, set `services.nscd.enableNsncd = false`, but
please open an issue in nixpkgs so your issue can be fixed.
This has shown to be flaky in the VM test, at least when running on
the aarch64 ofborg builder(s).
I assume it's some flakyness in systemd-networkd not being fully up, or
at least not up to the point that it properly replies to the _gateway
request.
This part of the test is supposed to test external (non-glibc) nss
module lookup for the host database works, which is already sufficiently
covered in the previous checks (for *.localhost). Drop these redundant
checks. We're not integration-testing networkd here.
nixosTests.systemd is quite heavy, it requires a full graphical system,
which is quite a big of a rebuild if the only thing you want to test is
whether dynamic users work.
This is now moved to an `nscd` test, which tests various NSS lookups,
making extra sure that the nscd path is tested, not the fallback path
(by hiding /etc/nsswitch.conf and /etc/hosts for getent).
nixosTests.resolv is removed. It didn't check for reverse lookups,
didn't catch nscd breaking halfway in between, and also had an
ambiguous reverse lookup - 192.0.2.1 could either reverse lookup to
host-ipv4.example.net, or host-dual.example.net.
