refind: fix runtime errors

In newer versions, instead of using $PWD to locate its ressource files,
Refind now refers to the dir containing $0.
This causes runtime errors due to missing ressources.

In lieu a wrapper binary, we now simply patch the variable 'RefindDir'
which stores the path to the ressource dir.

pkgs/tools/bootloaders/refind/default.nix

@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
     install -D -m0644 gptsync/gptsync_${efiPlatform}.efi $out/share/refind/tools_${efiPlatform}/gptsync_${efiPlatform}.efi
 
     # helper scripts
-    install -D -m0755 refind-install $out/share/refind/refind-install
+    install -D -m0755 refind-install $out/bin/refind-install
     install -D -m0755 mkrlconf $out/bin/refind-mkrlconf
     install -D -m0755 mvrefind $out/bin/refind-mvrefind
     install -D -m0755 fonts/mkfont.sh $out/bin/refind-mkfont
@@ -86,21 +86,13 @@ stdenv.mkDerivation rec {
     # keys
     install -D -m0644 keys/* $out/share/refind/keys/
 
-    # The refind-install script assumes that all resource files are
-    # installed under the same directory as the script itself. To avoid
-    # having to patch around this assumption, generate a wrapper that
-    # cds into $out/share/refind and executes the real script from
-    # there.
-    cat >$out/bin/refind-install <<EOF
-#! ${stdenv.shell}
-cd $out/share/refind && exec -a $out/bin/refind-install ./refind-install \$*
-EOF
-    chmod +x $out/bin/refind-install
+    # Fix variable definition of 'RefindDir' which is used to locate ressource files.
+    sed -i "s,\bRefindDir=.*,RefindDir=$out/share/refind,g" $out/bin/refind-install
 
     # Patch uses of `which`.  We could patch in calls to efibootmgr,
     # openssl, convert, and openssl, but that would greatly enlarge
     # refind's closure (from ca 28MB to over 400MB).
-    sed -i 's,`which \(.*\)`,`type -p \1`,g' $out/share/refind/refind-install
+    sed -i 's,`which \(.*\)`,`type -p \1`,g' $out/bin/refind-install
     sed -i 's,`which \(.*\)`,`type -p \1`,g' $out/bin/refind-mvrefind
     sed -i 's,`which \(.*\)`,`type -p \1`,g' $out/bin/refind-mkfont
   '';