$ git clone -n https://src.fedoraproject.org/rpms/rakarrack.git /var/lib/mock/f41-build-746175-13352/root/chroot_tmpdir/scmroot/rakarrack
Cloning into '/var/lib/mock/f41-build-746175-13352/root/chroot_tmpdir/scmroot/rakarrack'...
$ git fetch origin ac00447fe89a99603405aa871197ec5bba4ccb61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rakarrack
 * [new ref]         ac00447fe89a99603405aa871197ec5bba4ccb61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac00447 Eliminate use of obsolete %patchN syntax (#2283636)