nixos/boot-media: soft-force entire fs layout

https://github.com/NixOS/nixpkgs/pull/131760 was made to avo
a speicific configuration conflict that errored out for multiple definitions of "/" when the installer where overlayed
on any existing host configuration.

---

Problem 1: It turns out that in also other mountpoints can coflict.

Solution 1: use `mkOverride 60` for all mountpoints (even for the ones unlikely causing confilct for consistency sake)

---

Problem 2: It turns out that on an installation media for a fresh machine (before formatting), we usually don't have any devices yet formatted. However defining for example `fileSystems.<nme>.device = "/dev/disk/by-label/...", in newer versions of nixos, seems to make the system startup fail. Similarily waiting for a non-existent swap device does not make the startup fail, but has a 1:30 min timeout.

Solution 2: For an installation medium, soft-override ("unless users know what they are doing") the entire `fileSystems` and `swapDevices` definitions.

1 files changed, 9 insertions, 9 deletions

diff --git a/nixos/modules/installer/netboot/netboot.nix b/nixos/modules/installer/netboot/netboot.nix
index f7543fdf4a23..adcaf9d1a335 100644
--- a/nixos/modules/installer/netboot/netboot.nix
+++ b/nixos/modules/installer/netboot/netboot.nix
@@ -29,31 +29,31 @@ with lib;
           then []
           else [ pkgs.grub2 pkgs.syslinux ]);
 
-    fileSystems."/" =
-      # This module is often over-layed onto an existing host config
-      # that defines `/`. We use mkOverride 60 to override standard
-      # values, but at the same time leave room for mkForce values
-      # targeted at the image build.
-      { fsType = mkOverride 60 "tmpfs";
+    # This module is often over-layed onto an existing host config
+    # that defines `fileSystems`. We use mkOverride 60 to override
+    # standard values, but at the same time leave room for mkForce
+    # values targeted at the image build.
+    fileSystems."/" = mkOverride 60
+      { fsType = "tmpfs";
         options = [ "mode=0755" ];
       };
 
     # In stage 1, mount a tmpfs on top of /nix/store (the squashfs
     # image) to make this a live CD.
-    fileSystems."/nix/.ro-store" =
+    fileSystems."/nix/.ro-store" = mkOverride 60
       { fsType = "squashfs";
         device = "../nix-store.squashfs";
         options = [ "loop" ];
         neededForBoot = true;
       };
 
-    fileSystems."/nix/.rw-store" =
+    fileSystems."/nix/.rw-store" = mkOverride 60
       { fsType = "tmpfs";
         options = [ "mode=0755" ];
         neededForBoot = true;
       };
 
-    fileSystems."/nix/store" =
+    fileSystems."/nix/store" = mkOverride 60
       { fsType = "overlay";
         device = "overlay";
         options = [