9bfd864c59
Changes the evaluation order in that it evaluates assertions before
warnings, so that eg. the following would work:
{ config, lib, ... }:
{
options.foo = lib.mkOption {
type = lib.types.bool;
default = true;
description = "...";
};
options.bar = lib.mkOption {
type = lib.types.bool;
default = false;
description = "...";
};
config = lib.mkMerge [
(lib.mkIf config.bar {
system.build.bar = "foobar";
})
(lib.mkIf config.foo {
assertions = lib.singleton {
assertion = config.bar;
message = "Bar needs to be enabled";
};
systemd.services.foo = {
description = "Foo";
serviceConfig.ExecStart = config.system.build.bar;
};
})
];
}
This is because the systemd module includes definitions for warnings
that would trigger evaluation of the config.system.build.bar definition.
The original pull request references a breakage due to the following:
{
services.nixosManual.enable = false;
services.nixosManual.showManual = true;
}
However, changing the eval order between asserts and warnings clearly is
a corner case here and it only happens because of the aforementioned
usage of warnings in the systemd module and needs more discussion.
Nevertheless, this is still useful because it lowers the evaluation time
whenever an assertion is hit, which is a hard failure anyway.
Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the Hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:
% git remote add channels https://github.com/NixOS/nixpkgs-channels.git
For stability and maximum binary package support, it is recommended to maintain
custom changes on top of one of the channels, e.g. nixos-18.03 for the latest
release and nixos-unstable for the latest successful build of master:
% git remote update channels
% git rebase channels/nixos-18.03
For pull-requests, please rebase onto nixpkgs master.
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