$ git clone -n https://src.fedoraproject.org/rpms/efibootmgr.git /var/lib/mock/f42-build-867433-175505/root/chroot_tmpdir/scmroot/efibootmgr
Cloning into '/var/lib/mock/f42-build-867433-175505/root/chroot_tmpdir/scmroot/efibootmgr'...
$ git fetch origin 1fdd48765372a82d8b678d6fcaf9d8b3d9903132:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/efibootmgr
 * [new ref]         1fdd48765372a82d8b678d6fcaf9d8b3d9903132 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fdd487 Rebuilt for the bin-sbin merge (2nd attempt)