Correct path for UEFI stub

respect any $prefix given to the systemd installation

https://github.com/dracutdevs/dracut/pull/196

dracut.8.asc

@@ -498,8 +498,8 @@ will not be able to boot.
 **--uefi-stub _<FILE>_**::
     Specifies the UEFI stub loader, which will load the attached kernel, initramfs and
     kernel command line and boots the kernel. The default is
-    _/lib/systemd/boot/efi/linux<EFI-MACHINE-TYPE-NAME>.efi.stub_
-    or _/usr/lib/gummiboot/linux<EFI-MACHINE-TYPE-NAME>.efi.stub_
+    _$prefix/lib/systemd/boot/efi/linux<EFI-MACHINE-TYPE-NAME>.efi.stub_
+    or _$prefix/lib/gummiboot/linux<EFI-MACHINE-TYPE-NAME>.efi.stub_
 
 **--kernel-image _<FILE>_**::
     Specifies the kernel image, which to include in the UEFI executable. The default is

dracut.asc

@@ -132,7 +132,7 @@ The following steps are executed during a shutdown:
 
 * systemd switches to the shutdown.target
 * systemd starts
-  /lib/systemd/system/shutdown.target.wants/dracut-shutdown.service
+  $prefix/lib/systemd/system/shutdown.target.wants/dracut-shutdown.service
 * dracut-shutdown.service executes /usr/lib/dracut/dracut-initramfs-restore
   which unpacks the initramfs to /run/initramfs
 * systemd finishes shutdown.target

dracut.sh

@@ -1029,7 +1029,7 @@ if [[ ! $print_cmdline ]]; then
 
         if ! [[ -s $uefi_stub ]]; then
             for uefi_stub in \
-                "/lib/systemd/boot/efi/linux${EFI_MACHINE_TYPE_NAME}.efi.stub" \
+                "${systemdutildir}/boot/efi/linux${EFI_MACHINE_TYPE_NAME}.efi.stub" \
                     "/usr/lib/gummiboot/linux${EFI_MACHINE_TYPE_NAME}.efi.stub"; do
                 [[ -s $uefi_stub ]] || continue
                 break