$ git clone -n https://src.fedoraproject.org/rpms/btrfs-efi.git /var/lib/mock/f41-build-side-1-3102804-39354/root/chroot_tmpdir/scmroot/btrfs-efi
Cloning into '/var/lib/mock/f41-build-side-1-3102804-39354/root/chroot_tmpdir/scmroot/btrfs-efi'...
$ git fetch origin 74a68cde2cb497fe31e301b114e2af2df0e93608:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/btrfs-efi
 * [new ref]         74a68cde2cb497fe31e301b114e2af2df0e93608 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74a68cd Fix patch to build properly as EFI driver