I may have finally found a clean solution to the issues[1][2][3] with
the automatic discovery of wireless network interfaces.
[1]: https://github.com/NixOS/nixpkgs/issues/101963
[2]: https://github.com/NixOS/nixpkgs/issues/23196
[3]: https://github.com/NixOS/nixpkgs/pull/125917#issuecomment-856000426
Currently the start script fails right away if no interface is available
by the time it's running, possibly leaving the system without network.
This happens when running a little early in the boot. A solution is to
instead wait for at least one interface to appear before scanning the
/sys/class/net/ directory. This is done here by listening for the right
udev events (from the net/wlan subsystem) using the `udevadm monitor`
command and grep to match its output.
This methods guarantees the availability of at least one interface to
wpa_supplicant, but won't add additional interfaces once it has started.
However, if the current interface is lost, say unplugged, the service is
automatically stopped and will be restarted as soon as a one (not
necessarily the same) is detected. It would be possible make this fully
dynamic by running another service that continously listen for udev
events and manages the main wpa_supplicant daemon, but this is probably
overkill.
I tested the following cases:
- one interface, starting at boot, w/o predictable naming scheme
- two interfaces, starting at boot (intel wireless and a usb adapter),
w/o predictable naming scheme
- one interface after the system booted, w/o predictable naming scheme
- two interfaces after the system booted, w/o predictable naming scheme
- unplugging and plugging back the current interface
I expect it suffices that the channel only blocks on one firefox ESR
test - the one for the default ESR. I didn't want to have the
information about the default in two places, so either of the tests will
be evaluated twice (but to the same *.drv I hope).
Analogous to 6325d15e90.
The test certificate expiration date was set to the default 30 days.
This certificate is generated through its own derivation. As with
every derivation, it gets cached by cache.nixos.org once we build it.
In practice, we rebuild this derivation only if one of its input
changes. The only inputs here being openssl and stdenv.
While it's not an issue on the unstable branches, it can be
problematic on a stable release: the test will fail after 30 days.
Extending the certificate lifespan from 1 month to 100 years to prevent
it from getting expired while being cached.
There is no generic services.kea.enable option. Instead kea consists of
four daemons (dhcp4, dhcp6, ddns, ctrlagent) that can be enabled
individually. In this test we're just looking at dhcp6.
Some ACME providers (like Buypass) are using a different certificate
to sign OCSP responses than for server certificates. Therefore,
sslTrustedCertificate should be provided by the user and we need to
allow that.
