* Work around an incompatibility between LVM's udev rules and GRUB 2

(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550704).

svn path=/nixpkgs/trunk/; revision=19304

pkgs/tools/misc/grub/1.9x.nix

@@ -16,7 +16,17 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ bison ncurses libusb freetype ];
 
-  patchPhase =
+  patches =
+    [ # The udev rules for LVM create symlinks in /dev/mapper rathe
+      # than device nodes, causing GRUB to fail to recognize LVM
+      # volumes. See
+      # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550704
+      # This ugly workaround makes `find_root_device' use stat() on
+      # files in /dev/mapper instead of lstat().
+      ./device-mapper-symlinks.patch
+    ];
+
+  postPatch =
     '' gunzip < "${unifont_bdf}" > "unifont.bdf"
        sed -i "configure" \
            -e "s|/usr/src/unifont.bdf|$PWD/unifont.bdf|g"

pkgs/tools/misc/grub/device-mapper-symlinks.patch

@@ -0,0 +1,28 @@
+Only in grub-1.97.1-orig/: grub-1.97.1
+diff -rc -x '*~' grub-1.97.1-orig/util/getroot.c grub-1.97.1/util/getroot.c
+*** grub-1.97.1-orig/util/getroot.c	2009-11-09 16:48:16.000000000 +0100
+--- grub-1.97.1/util/getroot.c	2010-01-08 00:26:12.000000000 +0100
+***************
+*** 217,224 ****
+  	continue;
+  
+        if (S_ISLNK (st.st_mode))
+! 	/* Don't follow symbolic links.  */
+! 	continue;
+  
+        if (S_ISDIR (st.st_mode))
+  	{
+--- 217,229 ----
+  	continue;
+  
+        if (S_ISLNK (st.st_mode))
+!         {
+!           if (strcmp(dir, "mapper") != 0)
+!             /* Don't follow symbolic links.  */
+!             continue;
+!           if (stat (ent->d_name, &st) < 0)
+!             continue;
+!         }
+  
+        if (S_ISDIR (st.st_mode))
+  	{