zfs: dynamically determine latestCompatibleLinuxPackages

This removes the need to micromanage this value, instead we simply find
the correct one based on the existing kernelCompatible attr (though that
is now a function). This not only simplifies ZFS upgrades, but also
whenever Kernel versions are removed due to EOL.

(cherry picked from commit 7fa05c7)
(cherry picked from commit 34e1748)
(cherry picked from commit d174eca)

pkgs/os-specific/linux/zfs/2_1.nix

@@ -1,7 +1,6 @@
 { callPackage
 , kernel ? null
 , stdenv
-, linuxKernel
 , lib
 , nixosTests
 , ...
@@ -15,9 +14,7 @@ callPackage ./generic.nix args {
   # this attribute is the correct one for this package.
   kernelModuleAttribute = "zfs_2_1";
   # check the release notes for compatible kernels
-  kernelCompatible = kernel.kernelOlder "6.8";
-
-  latestCompatibleLinuxPackages = linuxKernel.packages.linux_6_6;
+  kernelCompatible = kernel: kernel.kernelOlder "6.8";
 
   # This is a fixed version to the 2.1.x series, move only
   # if the 2.1.x series moves.

pkgs/os-specific/linux/zfs/2_2.nix

@@ -2,7 +2,6 @@
 , kernel ? null
 , stdenv
 , lib
-, linuxKernel
 , nixosTests
 , ...
 } @ args:
@@ -15,9 +14,7 @@ callPackage ./generic.nix args {
   # this attribute is the correct one for this package.
   kernelModuleAttribute = "zfs_2_2";
   # check the release notes for compatible kernels
-  kernelCompatible = kernel.kernelOlder "6.10";
-
-  latestCompatibleLinuxPackages = linuxKernel.packages.linux_6_6;
+  kernelCompatible = kernel: kernel.kernelOlder "6.10";
 
   # this package should point to the latest release.
   version = "2.2.5";

pkgs/os-specific/linux/zfs/generic.nix

@@ -2,6 +2,7 @@ let
   genericBuild =
   { pkgs, lib, stdenv, fetchFromGitHub, fetchpatch
   , autoreconfHook269, util-linux, nukeReferences, coreutils
+  , linuxKernel
   , perl
   , configFile ? "all"
 
@@ -27,7 +28,6 @@ let
   , kernelModuleAttribute
   , extraPatches ? []
   , rev ? "zfs-${version}"
-  , latestCompatibleLinuxPackages
   , kernelCompatible ? null
   , maintainers ? (with lib.maintainers; [ amarshall ])
   , tests
@@ -198,7 +198,13 @@ let
     outputs = [ "out" ] ++ optionals buildUser [ "dev" ];
 
     passthru = {
-      inherit enableMail latestCompatibleLinuxPackages kernelModuleAttribute;
+      inherit enableMail kernelModuleAttribute;
+      latestCompatibleLinuxPackages = lib.pipe linuxKernel.packages [
+        builtins.attrValues
+        (builtins.filter (kPkgs: (builtins.tryEval kPkgs).success && kPkgs ? kernel && kPkgs.kernel.pname == "linux" && kernelCompatible kPkgs.kernel))
+        (builtins.sort (a: b: (lib.versionOlder a.kernel.version b.kernel.version)))
+        lib.last
+      ];
       # The corresponding userspace tools to this instantiation
       # of the ZFS package set.
       userspaceTools = genericBuild (outerArgs // {
@@ -235,7 +241,7 @@ let
       mainProgram = "zfs";
       # If your Linux kernel version is not yet supported by zfs, try zfs_unstable.
       # On NixOS set the option `boot.zfs.package = pkgs.zfs_unstable`.
-      broken = buildKernel && (kernelCompatible != null) && !kernelCompatible;
+      broken = buildKernel && (kernelCompatible != null) && !(kernelCompatible kernel);
     };
   };
 in

pkgs/os-specific/linux/zfs/unstable.nix

@@ -1,7 +1,6 @@
 { callPackage
 , kernel ? null
 , stdenv
-, linuxKernel
 , nixosTests
 , ...
 } @ args:
@@ -14,9 +13,7 @@ callPackage ./generic.nix args {
   # this attribute is the correct one for this package.
   kernelModuleAttribute = "zfs_unstable";
   # check the release notes for compatible kernels
-  kernelCompatible = kernel.kernelOlder "6.11";
-
-  latestCompatibleLinuxPackages = linuxKernel.packages.linux_6_10;
+  kernelCompatible = kernel: kernel.kernelOlder "6.11";
 
   # this package should point to a version / git revision compatible with the latest kernel release
   # IMPORTANT: Always use a tagged release candidate or commits from the