tvl-depot/ops/nixos.nix

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# Helper functions for instantiating depot-compatible NixOS machines.
{ depot, lib, pkgs, ... }@args:
let inherit (lib) findFirst isAttrs;
in rec {
# This provides our standard set of arguments to all NixOS modules.
baseModule = { ... }: {
# Ensure that pkgs == third_party.nix
nixpkgs.pkgs = depot.third_party.nixpkgs;
nix.nixPath =
let
# Due to nixpkgsBisectPath, pkgs.path is not always in the nix store
nixpkgsStorePath =
if lib.hasPrefix builtins.storeDir (toString pkgs.path)
then builtins.storePath pkgs.path # nixpkgs is already in the store
else pkgs.path; # we need to dump nixpkgs to the store either way
in
[
("nixos=" + nixpkgsStorePath)
("nixpkgs=" + nixpkgsStorePath)
];
};
nixosFor = configuration: (depot.third_party.nixos {
configuration = { ... }: {
imports = [
baseModule
configuration
];
};
specialArgs = {
inherit (args) depot;
};
});
findSystem = hostname:
(findFirst
(system: system.config.networking.hostName == hostname)
(throw "${hostname} is not a known NixOS host")
(map nixosFor depot.ops.machines.all-systems));
rebuild-system = rebuildSystemWith (
# HACK: use the string of the original source to avoid copying the whole
# depot into the store just for this
builtins.toString depot.path.origSrc);
rebuildSystemWith = depotPath: pkgs.writeShellScriptBin "rebuild-system" ''
set -ue
if [[ $EUID -ne 0 ]]; then
echo "Oh no! Only root is allowed to rebuild the system!" >&2
exit 1
fi
echo "Rebuilding NixOS for $HOSTNAME"
system=$(${pkgs.nix}/bin/nix-build -E "((import ${depotPath} {}).ops.nixos.findSystem \"$HOSTNAME\").system" --no-out-link --show-trace)
${pkgs.nix}/bin/nix-env -p /nix/var/nix/profiles/system --set $system
$system/bin/switch-to-configuration switch
'';
# Systems that should be built in CI
whitbySystem = (nixosFor depot.ops.machines.whitby).system;
sandunySystem = (nixosFor depot.ops.machines.sanduny).system;
nixeryDev01System = (nixosFor depot.ops.machines.nixery-01).system;
meta.ci.targets = [ "sandunySystem" "whitbySystem" "nixeryDev01System" ];
}