$ git clone -n https://src.fedoraproject.org/rpms/librepository.git /var/lib/mock/f41-build-1022157-18052/root/chroot_tmpdir/scmroot/librepository
Cloning into '/var/lib/mock/f41-build-1022157-18052/root/chroot_tmpdir/scmroot/librepository'...
$ git fetch origin 560bb3488c3a27b4441efb110c25a7e93b13c243:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librepository
 * [new ref]         560bb3488c3a27b4441efb110c25a7e93b13c243 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 560bb34 Eliminate use of obsolete %patchN syntax (#2283636)