[Nix-dev] nixops: Deploying from macOS

[Daiderd Jordan]

1. Things like writeText use the stdenv so the inputs differ depending on the platform, resulting in a different output. Even tho the resulting files would be identical.
2. Yes, if the nix-daemon is used the NIX_BUILD_HOOK and NIX_REMOTE_SYSTEMS will be determined by the daemon process.
This means that nixops can't configure it dynamically to build using the vm.

I don't think there's a solution for this at the moment, except for configuring distributed builds on your nixops host.


On 26 May 2017 at 12:39:22, Kirill Elagin (kirelagin at gmail.com) wrote:

Hi,

I have finally switched my laptop to using nix-daemon and got bitten by https://github.com/NixOS/nixops/issues/260 (and/or https://github.com/NixOS/nixops/issues/483).

To be honest, I am completely lost. Could someone please explain to me what is going on here?

1. The error that I get is this one:

> error: a ‘x86_64-linux’ is required to build ‘/nix/store/cm2y0hlgv6dpcyzf022ih1b0qwh3x5n7-etc-logind.conf.drv’, but I am a ‘x86_64-darwin’

Why on Earth is Linux needed to build _config files_? Building configs is mostly echoing, right? Who exactly tells nix that `environment.etc` files require a certain platform to be built? Maybe we could fix that?

2. How is this all related to nix-daemon? `nixops/deployment.py` checks for `os.environ.get('NIX_REMOTE') != 'daemon'`, why does it do this? Is that because `NIX_BUILD_HOOK` does not work when using nix-daemon? What’s that whole story with `NIX_REMOTE_SYSTEMS` and ssh keys really about? Why are there no issues with ssh keys when we I do not use nix-daemon? Why copying something manually helps?
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