refactor: switch from using UUIDs for filesystems to partlabels. Requires partition modifications on hosts before rebuild

hosts/nero/hardware.nix

@@ -9,6 +9,7 @@
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
+    ../shared/fs-layouts/single-disk-btrfs.nix
   ];
 
   boot = {
@@ -22,58 +23,27 @@
     ];
 
     initrd.kernelModules = [ ];
-    kernelModules = [ "kvm-amd" ];
+    kernelModules = [ ];
     extraModulePackages = [ ];
   };
 
-  fileSystems = {
+  fileSystems."/mnt/fileshare" = {
-    "/" = {
+    device = "frank@vergil.cfl.rr.com:/mnt/shares";
-      device = "/dev/disk/by-uuid/7559f03a-28da-482d-934a-5d4f88ab085f";
+    fsType = "sshfs";
-      fsType = "btrfs";
-    };
 
-    "/home" = {
+    options = [
-      device = "/dev/disk/by-uuid/7559f03a-28da-482d-934a-5d4f88ab085f";
+      "uid=1000"
-      fsType = "btrfs";
+      "gid=1000"
-      options = [ "subvol=home" ];
+      "default_permissions"
-    };
+      "allow_other"
-
+      "_netdev"
-    "/nix" = {
+      "x-systemd.automount"
-      device = "/dev/disk/by-uuid/7559f03a-28da-482d-934a-5d4f88ab085f";
+      "reconnect"
-      fsType = "btrfs";
+      "ServerAliveInterval=15"
-      options = [ "subvol=nix" ];
+      "IdentityFile=${config.sops.secrets.personal_ssh_key_ed25519.path}"
-    };
+    ];
-
-    "/boot" = {
-      device = "/dev/disk/by-uuid/12B3-D345";
-      fsType = "vfat";
-      options = [
-        "fmask=0077"
-        "dmask=0077"
-      ];
-    };
-
-    "/mnt/fileshare" = {
-      device = "frank@vergil.cfl.rr.com:/mnt/shares";
-      fsType = "sshfs";
-      options = [
-        "uid=1000"
-        "gid=1000"
-        "default_permissions"
-        "allow_other"
-        "_netdev"
-        "x-systemd.automount"
-        "reconnect"
-        "ServerAliveInterval=15"
-        "IdentityFile=/root/.ssh/id_rsa"
-      ];
-    };
   };
 
-  swapDevices = [
-    { device = "/dev/disk/by-uuid/431e8332-e3d5-400b-93e7-27b9c8dc1dfe"; }
-  ];
-
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 
   hardware = {

hosts/pdw-frankiel/hardware.nix

@@ -9,6 +9,7 @@
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
+    ../shared/fs-layouts/single-disk-btrfs.nix
   ];
 
   boot = {
@@ -24,43 +25,11 @@
 
     initrd.kernelModules = [ ];
 
-    kernelModules = [ "kvm-intel" ];
+    kernelModules = [ ];
 
     extraModulePackages = [ ];
   };
 
-  fileSystems = {
-    "/" = {
-      device = "/dev/disk/by-uuid/2b88fa45-f012-4df6-b59c-5b45ee0fc6e8";
-      fsType = "btrfs";
-    };
-
-    "/home" = {
-      device = "/dev/disk/by-uuid/2b88fa45-f012-4df6-b59c-5b45ee0fc6e8";
-      fsType = "btrfs";
-      options = [ "subvol=home" ];
-    };
-
-    "/nix" = {
-      device = "/dev/disk/by-uuid/2b88fa45-f012-4df6-b59c-5b45ee0fc6e8";
-      fsType = "btrfs";
-      options = [ "subvol=nix" ];
-    };
-
-    "/boot" = {
-      device = "/dev/disk/by-uuid/679B-3FC0";
-      fsType = "vfat";
-      options = [
-        "fmask=0077"
-        "dmask=0077"
-      ];
-    };
-  };
-
-  swapDevices = [
-    { device = "/dev/disk/by-uuid/2ef72da1-8c5b-449d-8460-0f5833bd856d"; }
-  ];
-
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 
   hardware = {

hosts/shared/fs-layouts/single-disk-btrfs.nix

@@ -0,0 +1,36 @@
+{ _, ... }:
+{
+  # RECOMMENDED BTRFS SUBVOLUME LAYOUT
+  # /home
+  # /home/.snapshots (needed if snapper on home dir to be enabled)
+  # /srv
+  # /var/lib/portables
+  # /var/lib/machines
+  # /tmp
+  # /var/tmp
+  #
+  # REQUIRED PARTLABELS (can be set in parted or other tools NOT!!! FILESYSTEM LABEL!)
+  # /     - NIXOS
+  # /boot - ESP
+  # swap  - SWAP
+
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-partlabel/NIXOS";
+      fsType = "btrfs";
+    };
+
+    "/boot" = {
+      device = "/dev/disk/by-partlabel/ESP";
+      fsType = "vfat";
+      options = [
+        "fmask=0077"
+        "dmask=0077"
+      ];
+    };
+  };
+
+  swapDevices = [
+    { device = "/dev/disk/by-partlabel/SWAP"; }
+  ];
+}

hosts/shared/fs-layouts/single-disk-xfs.nix

@@ -0,0 +1,27 @@
+{ _, ... }:
+{
+  # REQUIRED PARTLABELS (can be set in parted or other tools NOT!!! FILESYSTEM LABEL!)
+  # /     - NIXOS
+  # /boot - ESP
+  # swap  - SWAP
+
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-partlabel/NIXOS";
+      fsType = "xfs";
+    };
+
+    "/boot" = {
+      device = "/dev/disk/by-partlabel/ESP";
+      fsType = "vfat";
+      options = [
+        "fmask=0077"
+        "dmask=0077"
+      ];
+    };
+  };
+
+  swapDevices = [
+    { device = "/dev/disk/by-partlabel/SWAP"; }
+  ];
+}

hosts/vergil/hardware.nix

@@ -8,6 +8,7 @@
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
+    ../shared/fs-layouts/single-disk-xfs.nix
   ];
 
   boot = {
@@ -25,36 +26,26 @@
       kernelModules = [ ];
     };
 
-    kernelModules = [ "kvm-intel" ];
+    kernelModules = [ ];
     extraModulePackages = [ ];
   };
 
-  fileSystems = {
+  # DO NOT mount by partlabel or other value other than UUID.
-    "/" = {
+  # Disk is a child of a VM disk from PROXMOX and WILL NOT
-      device = "/dev/disk/by-uuid/05376a0d-18d1-4e7b-8f75-fe052a5636ac";
+  # be picked up automatically elsewise.
-      fsType = "xfs";
+  fileSystems."/mnt" = {
-    };
+    device = "/dev/disk/by-uuid/1432aeae-71e9-4f34-97dc-cf0fe74a4e00";
+    fsType = "xfs";
 
-    "/boot" = {
+    options = [
-      device = "/dev/disk/by-uuid/631D-23D2";
+      "noauto"
-      fsType = "vfat";
+      "x-systemd.automount"
-      options = [
+      "x-systemd.after=mount-vm-disk.service"
-        "fmask=0077"
+    ];
-        "dmask=0077"
-      ];
-    };
-
-    "/mnt" = {
-      device = "/dev/disk/by-uuid/1432aeae-71e9-4f34-97dc-cf0fe74a4e00";
-      fsType = "xfs";
-      options = [
-        "noauto"
-        "x-systemd.automount"
-        "x-systemd.after=mount-vm-disk.service"
-      ];
-    };
   };
 
+  # Vergil doesn't have a swap device but ../shared/fs-layouts/single-disk-xfs.nix defines one.
+  # This shouldn't be an issue at runtime but explicit removal reduces log spam.
   swapDevices = [ ];
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;