--- util/grub-install.in	2012-02-03 04:16:36.032265000 -0600
+++ util/grub-install.in	2012-02-03 05:35:50.362628000 -0600
@@ -469,7 +469,12 @@
 grub_device="`"$grub_probe" --device-map="${device_map}" --target=device "${grubdir}"`" || exit 1
 
 if ! test -f "${grubdir}"/grubenv; then
-    "$grub_editenv" "${grubdir}"/grubenv create
+    case "`"$grub_probe" --target=fs "${grubdir}"`" in
+        btrfs | cpiofs | newc | odc | romfs | squash4 | tarfs | zfs)
+	    ;;
+        *)
+            "$grub_editenv" "${grubdir}"/grubenv create
+    esac
 fi
 
 # Create the core image. First, auto-detect the filesystem module.
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ ChangeLog.zfs-no-grubenv	2012-02-03 05:49:27.977376000 -0600
@@ -0,0 +1,5 @@
+2012-02-03  Richard Laager <address@hidden>
+
+	* util/grub-install.in: Don't create a grubenv file on filesystems
+	to which GRUB cannot write.
+