rename machines -> hosts

- shorter.
- congruent with `nixos-rebuild .` choosing what to build based on `hostname`.
- more widely used within other nix repos i've seen.
- more accurate in the case that i migrate a host to a different
machine (which i plan to do with servo).

flake.nix

@@ -45,7 +45,7 @@
     nixpkgsFor = local: target: import (patchedPkgs target) { crossSystem = target; localSystem = local; };
     # evaluate ONLY our overlay, for the provided system
     customPackagesFor = local: target: import ./pkgs/overlay.nix (nixpkgsFor local target) (nixpkgsFor local target);
-    decl-machine = { name, local, target }:
+    decl-host = { name, local, target }:
     let
       nixosSystem = import ((patchedPkgs target) + "/nixos/lib/eval-config.nix");
     in (nixosSystem {
@@ -54,7 +54,7 @@
       specialArgs = { inherit mobile-nixos home-manager impermanence; };
       modules = [
         ./modules
-        (import ./machines/instantiate.nix name)
+        (import ./hosts/instantiate.nix name)
         home-manager.nixosModule
         impermanence.nixosModule
         sops-nix.nixosModules.sops
@@ -77,8 +77,8 @@
       ];
     });
 
-    decl-bootable-machine = { name, local, target }: rec {
-      nixosConfiguration = decl-machine { inherit name local target; };
+    decl-bootable-host = { name, local, target }: rec {
+      nixosConfiguration = decl-host { inherit name local target; };
       # this produces a EFI-bootable .img file (GPT with a /boot partition and a system (/ or /nix) partition).
       # after building this:
       #   - flash it to a bootable medium (SD card, flash drive, HDD)
@@ -91,23 +91,23 @@
       #   - boot
       #   - if fs wasn't resized automatically, then `sudo btrfs filesystem resize max /`
       #   - checkout this flake into /etc/nixos AND UPDATE THE FS UUIDS.
-      #   - `nixos-rebuild --flake './#<machine>' switch`
+      #   - `nixos-rebuild --flake './#<host>' switch`
       img = nixosConfiguration.config.system.build.img;
     };
-    machines.servo = decl-bootable-machine { name = "servo"; local = "aarch64-linux"; target = "aarch64-linux"; };
-    machines.desko = decl-bootable-machine { name = "desko"; local = "x86_64-linux"; target = "x86_64-linux"; };
-    machines.lappy = decl-bootable-machine { name = "lappy"; local = "x86_64-linux"; target = "x86_64-linux"; };
-    machines.moby = decl-bootable-machine { name = "moby"; local = "aarch64-linux"; target = "aarch64-linux"; };
+    hosts.servo = decl-bootable-host { name = "servo"; local = "aarch64-linux"; target = "aarch64-linux"; };
+    hosts.desko = decl-bootable-host { name = "desko"; local = "x86_64-linux"; target = "x86_64-linux"; };
+    hosts.lappy = decl-bootable-host { name = "lappy"; local = "x86_64-linux"; target = "x86_64-linux"; };
+    hosts.moby = decl-bootable-host { name = "moby"; local = "aarch64-linux"; target = "aarch64-linux"; };
     # special cross-compiled variant, to speed up deploys from an x86 box to the arm target
     # note that these *do* produce different store paths, because the closure for the tools used to cross compile
     # v.s. emulate differ.
     # so deploying foo-cross and then foo incurs some rebuilding.
-    machines.servo-cross = decl-bootable-machine { name = "servo"; local = "x86_64-linux"; target = "aarch64-linux"; };
-    machines.moby-cross = decl-bootable-machine { name = "moby"; local = "x86_64-linux"; target = "aarch64-linux"; };
-    machines.rescue = decl-bootable-machine { name = "rescue"; local = "x86_64-linux"; target = "x86_64-linux"; };
+    hosts.servo-cross = decl-bootable-host { name = "servo"; local = "x86_64-linux"; target = "aarch64-linux"; };
+    hosts.moby-cross = decl-bootable-host { name = "moby"; local = "x86_64-linux"; target = "aarch64-linux"; };
+    hosts.rescue = decl-bootable-host { name = "rescue"; local = "x86_64-linux"; target = "x86_64-linux"; };
   in {
-    nixosConfigurations = builtins.mapAttrs (name: value: value.nixosConfiguration) machines;
-    imgs = builtins.mapAttrs (name: value: value.img) machines;
+    nixosConfigurations = builtins.mapAttrs (name: value: value.nixosConfiguration) hosts;
+    imgs = builtins.mapAttrs (name: value: value.img) hosts;
     packages = let
       allPkgsFor = sys: (customPackagesFor sys sys) // {
         nixpkgs = nixpkgsFor sys sys;

hosts/instantiate.nix

@@ -1,4 +1,4 @@
-# trampoline from flake.nix into the specific machine definition, while doing a tiny bit of common setup
+# trampoline from flake.nix into the specific host definition, while doing a tiny bit of common setup
 
 hostName: { ... }: {
   imports = [

modules/universal/allocations.nix

@@ -29,7 +29,7 @@ in
     sane.allocations.colin-uid = mkId 1000;
     sane.allocations.guest-uid = mkId 1100;
 
-    # found on all machines
+    # found on all hosts
     sane.allocations.sshd-uid = mkId 2001;  # 997
     sane.allocations.sshd-gid = mkId 2001;  # 997
     sane.allocations.polkituser-gid = mkId 2002;  # 998
@@ -39,15 +39,15 @@ in
     sane.allocations.systemd-oom-uid = mkId 2005;
     sane.allocations.systemd-oom-gid = mkId 2005;
 
-    # found on graphical machines
+    # found on graphical hosts
     sane.allocations.nm-iodine-uid = mkId 2101;  # desko/moby/lappy
 
-    # found on desko machine
+    # found on desko host
     sane.allocations.usbmux-uid = mkId 2204;
     sane.allocations.usbmux-gid = mkId 2204;
 
 
-    # originally found on moby machine
+    # originally found on moby host
     sane.allocations.avahi-uid = mkId 2304;
     sane.allocations.avahi-gid = mkId 2304;
     sane.allocations.colord-uid = mkId 2305;

modules/universal/pubkeys.nix

@@ -27,8 +27,8 @@ let
   };
 in {
   # map hostname -> something suitable for known_keys
-  hosts = builtins.mapAttrs (machine: keys: withHost machine keys.host) keys;
+  hosts = builtins.mapAttrs (host: keys: withHost host keys.host) keys;
   # map hostname -> something suitable for authorized_keys to allow access to colin@<hostname>
-  users = builtins.mapAttrs (machine: keys: withUser "colin@${machine}" keys.users.colin) keys;
+  users = builtins.mapAttrs (host: keys: withUser "colin@${host}" keys.users.colin) keys;
 }
 

modules/universal/secrets.nix

@@ -16,7 +16,7 @@
   #   add the result to .sops.yaml
   #   since we specify ssh pubkeys in the nix config, you can just grep for `ssh-ed25519` here and use those instead
   #
-  # for each machine you want to decrypt secrets:
+  # for each host you want to decrypt secrets:
   #   $ cat /etc/ssh/ssh_host_ed25519_key.pub | ssh-to-age
   #   add the result to .sops.yaml
   #   $ sops updatekeys secrets/example.yaml

readme.md

@@ -4,6 +4,12 @@ to deploy:
 nixos-rebuild --flake "./#servo" {build,switch}
 ```
 
+if the target is the same as the host, nix will grab the hostname automatically:
+
+```sh
+nixos-rebuild --flake . {build,switch}
+```
+
 more options (like building packages defined in this repo):
 
 ```sh