$ git clone -n https://src.fedoraproject.org/rpms/libbytesize.git /var/lib/mock/f41-build-846405-163077/root/chroot_tmpdir/scmroot/libbytesize
Cloning into '/var/lib/mock/f41-build-846405-163077/root/chroot_tmpdir/scmroot/libbytesize'...
$ git fetch origin 1a6e9890ae72559bdc4cebaddded5344f6765e8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libbytesize
 * [new ref]         1a6e9890ae72559bdc4cebaddded5344f6765e8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a6e989 Update to 2.11 upstream release