TLDR: default.nix was pointing to an unmaintained code base whereas stable.nix is up-to-date and maintained.
History
1. At first their was one Python version of vdirsyncer that had been working fine for years. Then, maintenance decreased and the package was marked as broken in nixpkgs.
2. The original author (@untitaker on github.com) of vdirsyncer decided to re-implement (part of) vdirsyncer in Rust. Nixpkgs made `vdirsyncer` point to the Rust version and renamed the Python historical version to `vdirsyncerStable`.
3. Eventually, @untitaker gave up on the Rust version.
4. Someone else (@WhyNotHugo on github.com) decided to take over maintenance of the Python version.
5. Mario Rodas (@marsam on github) and Damien Cassou updated the `vdirsyncerStable` to point to the work of @WhyNotHugo and mark the package as working again.
We currently build CONFIG_IPV6=m.
This seems to be not really well-supported in mainline kernels - see
https://lore.kernel.org/netdev/20201115224509.2020651-1-flokli@flokli.de/T/#u
Compiling it as a module doesn't give too much benefit - even for people
who did explicitly set `enableIPv6` to false, the `ipv6` module was
still loaded, as soon as another module was loaded that requires it
(bridge,br_netfilter,wireguard,ip6table_mangle,sctp,…).
By compiling it in, we only loose the possibility to not add it to
`boot.kernelModules` anymore (as it's part of the kernel directly). The
space savings are negligible.
People wanting to disable IPv6 still get the appropriate sysctls and
options set (while having the kernel code loaded), nothing is really
changing here.
This reverts commit 0fc5e60fd2510bea25434eadf7e986208632c29c.
For some reason the v1.0.3 PyPI tarball ships with tests that expect pytest-testmon master instead of the v1.0.3 code (tarpas/pytest-testmon#158), causing these tests to fail against 1.0.3 itself.
Also change to using cmake for the build (this is best supported by
upstream) and enable the automated tests for rtl_433.
The description could also use some love, so improved that as well.
