forked from extern/nixos-installer
39 lines
2.0 KiB
Nix
39 lines
2.0 KiB
Nix
dirname: inputs@{ self, nixpkgs, ...}: let
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inherit (nixpkgs) lib;
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inherit (import "${dirname}/vars.nix" dirname inputs) startsWith;
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in rec {
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## Logic Flow
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notNull = value: value != null;
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ifNull = value: default: (if value == null then default else value);
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withDefault = default: value: (if value == null then default else value);
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passNull = mayNull: expression: (if mayNull == null then null else expression);
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## Misc
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# Creates a package for `config.systemd.packages` that adds an `override.conf` to the specified `unit` (which is the only way to modify a single service template instance).
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mkSystemdOverride = pkgs: unit: text: (pkgs.runCommandNoCC unit { preferLocalBuild = true; allowSubstitutes = false; } ''
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mkdir -p $out/${lib.escapeShellArg "/etc/systemd/system/${unit}.d/"}
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<<<${lib.escapeShellArg text} cat >$out/${lib.escapeShellArg "/etc/systemd/system/${unit}.d/override.conf"}
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'');
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# Given »config.ids« (or equivalent) and a user name, returns the users numeric »uid:gid« pair as string.
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getOwnership = { gids, uids, ... }: user: "${toString uids.${user}}:${toString gids.${user}}";
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# Given »from« and »to« as »config.my.network.spec.hosts.*«,
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# picks the first of »to«'s IPs whose required subnet is either empty/any, or a prefix to any of the subnets in »from«:
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# ip = preferredRoute self.subNets other.routes;
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# ip6 = preferredRoute self.subNets (builtins.filter (r: r.is6) other.routes);
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# to.find(({ ip, prefix }) => from.any(_=>_.startsWith(prefix))).ip
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preferredRoute = from: to: (lib.findFirst ({ prefix, ip, ... }: prefix == "" || (builtins.any (fromSub: startsWith prefix fromSub) from)) { ip = ""; } to).ip;
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# Given a message and any value, traces both the message and the value, and returns the value.
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trace = message: value: (builtins.trace (message +": "+ (lib.generators.toPretty { } value)) value);
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rpoolOf = hostName: "rpool-${builtins.substring 0 8 (builtins.hashString "sha256" hostName)}";
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}
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