system-sendmail allows all sendmail's to be auto-detected, including on
non-NixOS systems. This is, to me, a better UX than having to manually
override the sendmailPath argument.
In exchange, it is a breach of retro-compatibility. Given right now I
can't see any uses for sendmailPath other than what is supported by
system-sendmail, I didn't keep it, but it'd be possible to allow
sendmailPath to override the choice of sendmail from system-sendmail.
* pr-55320:
nixos/release-notes: mention breaking changes with matrix-synapse update
nixos/matrix-synapse: reload service with SIGHUP
nixos/tests/matrix-synapse: generate ca and certificates
nixos/matrix-synapse: use python to launch synapse
pythonPackages.pymacaroons-pynacl: remove unmaintained fork
matrix-synapse: 0.34.1.1 -> 0.99.0
pythonPackages.pymacaroons: init at 0.13.0
Hydra should support multiple Nix versions (and currently contains fixes
to work with Nix 2.0 and higher).
Further Nix versions can be added to the `hydraPkgs` expression in the
test case which lists all supported Nix versions for Hydra.
I noticed that I was seeing the Go compiler build things in parallel even when I'd set `-j1 --cores 1`. It appears that the compiler, by default, uses the number of CPUs that are available to perform a build, while nixpkgs parallelizes at the directory level.
In order to change the fewest assumptions, this explicitly tells the Go compiler to run single-threaded. The flag's documentation is:
```
-p n
the number of programs, such as build commands or
test binaries, that can be run in parallel.
The default is the number of CPUs available.
```
So this should function as expected. Feedback appreciated!
Fixes#51858
56e12aae54bc67cabe5aa7c8d055438af4f62b5e ends up passing config to pkgs. Unfortunately this might be null and pkgs/top-level/default.nix assumes it is an attrset. To fix this, we just make the default for config = {}. Thanks to @kristoff3r for tracking this down.
/cc @domenkozar
Seen these fail non-deterministically at a high enough frequency
making it a good contender to disable completely.
See also #55293, #51121.
cc @hedning @jtojnar
