Use bcarnes' squashfs label patches instead of the dubious kludge

[nixos-qemu-vm-isolation] / modules / qemu-vm-isolation.nix

diff --git a/modules/qemu-vm-isolation.nix b/modules/qemu-vm-isolation.nix
index 69bacde444273ae9076c4ffe1f8d8a160767259c..5467f29a366de753f2714a6001762d2ae821999b 100644 (file)
--- a/modules/qemu-vm-isolation.nix
+++ b/modules/qemu-vm-isolation.nix
@@ -49,6 +49,17 @@ let
       }/nix-store.img";
     squashfs =
       "${hostPkgs.callPackage (modulesPath + "/../lib/make-squashfs.nix") {
+        squashfsTools = hostPkgs.squashfsTools.overrideAttrs (old: {
+          # We patch in support for squashfs labels because
+          # https://github.com/NixOS/nixpkgs/pull/236656 requires filesystems to have labels and
+          # https://github.com/plougher/squashfs-tools/issues/59 squashfs doesn't support labels
+          patches = (old.patches or []) ++ [ ./squashfs-tools-label.patch ];
+          buildInputs = (old.buildInputs or []) ++ [ hostPkgs.makeWrapper ];
+          postInstall = (old.postInstall or "") + ''
+            wrapProgram "$out/bin/mksquashfs" \
+              --append-flags "-label nix-store"
+          '';
+        });
         storeContents = config.virtualisation.additionalPaths;
       }}";
   };
@@ -61,8 +72,7 @@ in {
 
         erofs is more compact than ext4, but less mature.
 
-        squashfs support currently requires a dubious kludge that results in these
-        VMs not being able to mount any other squashfs volumes besides the nix store.
+        squashfs is best, but requires patches to set the filesystem label.
       '';
       type = lib.types.enum [ "ext4" "erofs" "squashfs" ];
       default = "ext4";
@@ -76,8 +86,10 @@ in {
       nixpkgs.overlays = optional (cfg.nixStoreFilesystemType == "squashfs")
         (final: prev: {
           util-linux = prev.util-linux.overrideAttrs (old: {
-            patches = (old.patches or [ ])
-              ++ [ ./libblkid-squashfs-nix-store-kludge.patch ];
+            # We patch in support for squashfs labels because
+            # https://github.com/NixOS/nixpkgs/pull/236656 requires filesystems to have labels and
+            # https://github.com/plougher/squashfs-tools/issues/59 squashfs doesn't support labels
+            patches = (old.patches or [ ]) ++ [ ./util-linux-squashfs-label.patch ];
           });
         });