haskellPackages.procex: only execute tests if Kernel >= 5.9

The compile time check for close_range support is broken fundamentally
at the moment (linux-headers is always 5.14, so it'll always assume
close_range is available, upstream is aware of this issue). As a
workaround, we disable the test suite if the kernel on the builder is
too old, allowing the package to still be built.

pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml

@@ -3846,7 +3846,6 @@ broken-packages:
   - process-leksah
   - process-listlike
   - processmemory
-  - procex
   - procrastinating-variable
   - procstat
   - prof2pretty

pkgs/development/haskell-modules/configuration-nix.nix

@@ -978,4 +978,21 @@ self: super: builtins.intersectAttrs super {
     doCheck = with pkgs.stdenv; hostPlatform == buildPlatform
       && buildPlatform.isx86;
   };
+
+  # procex relies on close_range which has been introduced in Linux 5.9,
+  # the test suite seems to force the use of this feature (or the fallback
+  # mechanism is broken), so we can't run the test suite on machines with a
+  # Kernel < 5.9. To check for this, we use uname -r to obtain the Kernel
+  # version and sort -V to compare against our minimum version. If the
+  # Kernel turns out to be older, we disable the test suite.
+  procex = overrideCabal super.procex (drv: {
+    postConfigure = ''
+      minimumKernel=5.9
+      higherVersion=`printf "%s\n%s\n" "$minimumKernel" "$(uname -r)" | sort -rV | head -n1`
+      if [[ "$higherVersion" = "$minimumKernel" ]]; then
+        echo "Used Kernel doesn't support close_range, disabling tests"
+        unset doCheck
+      fi
+    '' + (drv.postConfigure or "");
+  });
 }

pkgs/development/haskell-modules/hackage-packages.nix

@@ -215225,8 +215225,6 @@ self: {
        testHaskellDepends = [ async base bytestring hspec unix ];
        description = "Ergonomic process launching with extreme flexibility and speed";
        license = lib.licenses.mit;
-       hydraPlatforms = lib.platforms.none;
-       broken = true;
      }) {};
 
   "procrastinating-structure" = callPackage