Recently a few internal APIs have changed[1]. The `outputPaths` function
has been removed and a lot of data structures are modeled with
`std::optional` which broke compilation.
This patch updates the code in `hydra-queue-runner` accordingly to make
sure that Hydra compiles again.
[1] https://github.com/NixOS/nix/pull/3883
Some time ago the data structure for maintainer descriptions in
`nixpkgs` changed from a simple attr set with maintainer emails as
values to an attribute set where the maintainer' nick is associated to
an attribute set with email, GitHub handle and full name.
Hydra can either parse a Nix list or fetches `shortName` from the
associated attribute set (which is used for `meta.licenses` as each
value in it contains a `shortName`). This behavior needs to be
replicated for maintainers to retrieve the emails for `hydra-notify`.
This change is backwards-compatible since `queryMetaStrings` is still
able to understand lists, so old versions of `nixpkgs` or packages using
the old maintainer data structure remain usable.
This is because setting only the initial heap size to more than
the default value (or the configured value) will cause all initial evals
until maxHeapSize expands to the given value to abort.
The 1.1 multiplier comes from the the configured defaults on NixOS' hydra,
and from the previous multiplier used before
7876cf677c.
The job has been failing since https://hydra.nixos.org/eval/1461286
with the following error:
hydra-eval-jobs.cc:278:17: error: 'evalSettings' was not declared in this scope
evalSettings.restrictEval = true;
^~~~~~~~~~~~
This is likely due to a typo in 0882519 where that line and the
corresponding comment were moved, and `settings` was changed in that
one place to `evalSettings`.
I reproduced the error by running `nix-build release.nix -A
build.x86_64-linux` on my machine, and this small change fixes it.
You can now set 'evaluator_max_heap_size' to make hydra-eval-jobs
restart itself if the Boehm heap exceeds the specified size.
For example, with 'evaluator_max_heap_size = 256000000',
$ hydra-eval-jobs '<nixpkgs/pkgs/top-level/release.nix>' -I nixpkgs=channel:nixos-17.09
has a max RSS of .56 GiB rather than 4.7 GiB.
Unfortunately it doesn't help much for the NixOS jobsets because of
the "tested" job which requires a huge amount of memory all by itself.
This cannot be done in the hydra-evaluator systemd unit, since then
every other Nix process (e.g. hydra-evaluator and nix-prefetch-*) will
also allocate the specified heap size, probably leading to OOM.
Also, remove support in hydra-eval-jobs for multiple jobset input
alternatives. The web interface hasn't supported this in a long
time. Thus we can use the regular "--arg" handler.
