flake: format
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flake.nix
194
flake.nix
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@ -37,106 +37,114 @@
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home-manager,
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sops-nix,
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uninsane
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}: let
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nixpkgsCompiledBy = local: nixpkgs.legacyPackages."${local}";
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# return something which behaves like `pkgs`, for the provided system
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# `local` = architecture of builder. `target` = architecture of the system beying deployed to
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nixpkgsFor = local: target:
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import ((nixpkgsCompiledBy local).path) {
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crossSystem = target;
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localSystem = local;
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};
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# evaluate ONLY our overlay, for the provided system
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customPackagesFor = local: target:
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let pkgs = nixpkgsFor local target;
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in import ./pkgs/overlay.nix pkgs pkgs;
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decl-host = { name, local, target }:
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}:
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let
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# XXX: we'd prefer to use `nixosSystem = (nixpkgsCompiledBy local).nixos`
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# but it doesn't propagate config to the underlying pkgs, meaning it doesn't let you use
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# non-free packages even after setting nixpkgs.allowUnfree.
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nixosSystem = import ((nixpkgsCompiledBy local).path + "/nixos/lib/eval-config.nix");
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in (nixosSystem {
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# we use pkgs built for and *by* the target, i.e. emulation, by default.
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# cross compilation only happens on explicit access to `pkgs.cross`
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system = target;
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modules = [
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./modules
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(import ./hosts/instantiate.nix name)
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home-manager.nixosModule
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sops-nix.nixosModules.sops
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{
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nixpkgs.overlays = [
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(import "${mobile-nixos}/overlay/overlay.nix")
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uninsane.overlay
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(import ./pkgs/overlay.nix)
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(next: prev: rec {
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# non-emulated packages build *from* local *for* target.
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# for large packages like the linux kernel which are expensive to build under emulation,
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# the config can explicitly pull such packages from `pkgs.cross` to do more efficient cross-compilation.
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cross = (nixpkgsFor local target) // (customPackagesFor local target);
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stable = nixpkgs-stable.legacyPackages."${target}";
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nixpkgsCompiledBy = local: nixpkgs.legacyPackages."${local}";
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# return something which behaves like `pkgs`, for the provided system
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# `local` = architecture of builder. `target` = architecture of the system beying deployed to
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nixpkgsFor = local: target:
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import ((nixpkgsCompiledBy local).path) {
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crossSystem = target;
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localSystem = local;
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};
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# evaluate ONLY our overlay, for the provided system
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customPackagesFor = local: target:
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let pkgs = nixpkgsFor local target;
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in import ./pkgs/overlay.nix pkgs pkgs;
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# cross-compatible packages
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# gocryptfs = cross.gocryptfs;
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decl-host = { name, local, target }:
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let
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# XXX: we'd prefer to use `nixosSystem = (nixpkgsCompiledBy local).nixos`
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# but it doesn't propagate config to the underlying pkgs, meaning it doesn't let you use
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# non-free packages even after setting nixpkgs.allowUnfree.
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nixosSystem = import ((nixpkgsCompiledBy local).path + "/nixos/lib/eval-config.nix");
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in
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(nixosSystem {
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# we use pkgs built for and *by* the target, i.e. emulation, by default.
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# cross compilation only happens on explicit access to `pkgs.cross`
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system = target;
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modules = [
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./modules
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(import ./hosts/instantiate.nix name)
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home-manager.nixosModule
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sops-nix.nixosModules.sops
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{
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nixpkgs.overlays = [
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(import "${mobile-nixos}/overlay/overlay.nix")
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uninsane.overlay
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(import ./pkgs/overlay.nix)
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(next: prev: rec {
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# non-emulated packages build *from* local *for* target.
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# for large packages like the linux kernel which are expensive to build under emulation,
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# the config can explicitly pull such packages from `pkgs.cross` to do more efficient cross-compilation.
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cross = (nixpkgsFor local target) // (customPackagesFor local target);
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stable = nixpkgs-stable.legacyPackages."${target}";
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# pinned packages:
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})
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];
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}
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];
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});
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# cross-compatible packages
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# gocryptfs = cross.gocryptfs;
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decl-bootable-host = { name, local, target }: rec {
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nixosConfiguration = decl-host { inherit name local target; };
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# this produces a EFI-bootable .img file (GPT with a /boot partition and a system (/ or /nix) partition).
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# after building this:
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# - flash it to a bootable medium (SD card, flash drive, HDD)
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# - resize the root partition (use cfdisk)
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# - mount the part
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# - chown root:nixbld <part>/nix/store
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# - chown root:root -R <part>/nix/store/*
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# - chown root:root -R <part>/persist # if using impermanence
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# - populate any important things (persist/, home/colin/.ssh, etc)
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# - boot
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# - if fs wasn't resized automatically, then `sudo btrfs filesystem resize max /`
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# - checkout this flake into /etc/nixos AND UPDATE THE FS UUIDS.
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# - `nixos-rebuild --flake './#<host>' switch`
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img = nixosConfiguration.config.system.build.img;
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};
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hosts.servo = decl-bootable-host { name = "servo"; local = "x86_64-linux"; target = "x86_64-linux"; };
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hosts.desko = decl-bootable-host { name = "desko"; local = "x86_64-linux"; target = "x86_64-linux"; };
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hosts.lappy = decl-bootable-host { name = "lappy"; local = "x86_64-linux"; target = "x86_64-linux"; };
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hosts.moby = decl-bootable-host { name = "moby"; local = "aarch64-linux"; target = "aarch64-linux"; };
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# special cross-compiled variant, to speed up deploys from an x86 box to the arm target
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# note that these *do* produce different store paths, because the closure for the tools used to cross compile
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# v.s. emulate differ.
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# so deploying foo-cross and then foo incurs some rebuilding.
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hosts.moby-cross = decl-bootable-host { name = "moby"; local = "x86_64-linux"; target = "aarch64-linux"; };
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hosts.rescue = decl-bootable-host { name = "rescue"; local = "x86_64-linux"; target = "x86_64-linux"; };
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in {
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# TODO: use catAttrs?
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nixosConfigurations = builtins.mapAttrs (name: value: value.nixosConfiguration) hosts;
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imgs = builtins.mapAttrs (name: value: value.img) hosts;
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packages = let
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allPkgsFor = sys: (customPackagesFor sys sys) // {
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nixpkgs = nixpkgsCompiledBy sys;
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uninsane = uninsane.packages."${sys}";
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# pinned packages:
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})
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];
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}
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];
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});
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decl-bootable-host = { name, local, target }: rec {
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nixosConfiguration = decl-host { inherit name local target; };
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# this produces a EFI-bootable .img file (GPT with a /boot partition and a system (/ or /nix) partition).
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# after building this:
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# - flash it to a bootable medium (SD card, flash drive, HDD)
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# - resize the root partition (use cfdisk)
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# - mount the part
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# - chown root:nixbld <part>/nix/store
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# - chown root:root -R <part>/nix/store/*
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# - chown root:root -R <part>/persist # if using impermanence
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# - populate any important things (persist/, home/colin/.ssh, etc)
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# - boot
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# - if fs wasn't resized automatically, then `sudo btrfs filesystem resize max /`
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# - checkout this flake into /etc/nixos AND UPDATE THE FS UUIDS.
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# - `nixos-rebuild --flake './#<host>' switch`
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img = nixosConfiguration.config.system.build.img;
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};
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hosts = {
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servo = decl-bootable-host { name = "servo"; local = "x86_64-linux"; target = "x86_64-linux"; };
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desko = decl-bootable-host { name = "desko"; local = "x86_64-linux"; target = "x86_64-linux"; };
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lappy = decl-bootable-host { name = "lappy"; local = "x86_64-linux"; target = "x86_64-linux"; };
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moby = decl-bootable-host { name = "moby"; local = "aarch64-linux"; target = "aarch64-linux"; };
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# special cross-compiled variant, to speed up deploys from an x86 box to the arm target
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# note that these *do* produce different store paths, because the closure for the tools used to cross compile
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# v.s. emulate differ.
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# so deploying foo-cross and then foo incurs some rebuilding.
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moby-cross = decl-bootable-host { name = "moby"; local = "x86_64-linux"; target = "aarch64-linux"; };
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rescue = decl-bootable-host { name = "rescue"; local = "x86_64-linux"; target = "x86_64-linux"; };
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};
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in {
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x86_64-linux = allPkgsFor "x86_64-linux";
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aarch64-linux = allPkgsFor "aarch64-linux";
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};
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templates = {
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python-data = {
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# initialize with:
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# - `nix flake init -t '/home/colin/dev/nixos/#python-data'`
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# then enter with:
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# - `nix develop`
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path = ./templates/python-data;
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description = "python environment for data processing";
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# TODO: use catAttrs?
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nixosConfigurations = builtins.mapAttrs (name: value: value.nixosConfiguration) hosts;
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imgs = builtins.mapAttrs (name: value: value.img) hosts;
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packages =
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let
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allPkgsFor = sys: (customPackagesFor sys sys) // {
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nixpkgs = nixpkgsCompiledBy sys;
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uninsane = uninsane.packages."${sys}";
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};
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in {
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x86_64-linux = allPkgsFor "x86_64-linux";
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aarch64-linux = allPkgsFor "aarch64-linux";
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};
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templates = {
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python-data = {
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# initialize with:
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# - `nix flake init -t '/home/colin/dev/nixos/#python-data'`
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# then enter with:
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# - `nix develop`
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path = ./templates/python-data;
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description = "python environment for data processing";
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};
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};
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};
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};
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}
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