$ git clone -n https://src.fedoraproject.org/rpms/python-uharfbuzz.git /var/lib/mock/f45-build-33488-670/root/chroot_tmpdir/scmroot/python-uharfbuzz
Cloning into '/var/lib/mock/f45-build-33488-670/root/chroot_tmpdir/scmroot/python-uharfbuzz'...
$ git fetch origin b8d3d1db34e17e38325db40cc98eb288118b20a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-uharfbuzz
 * [new ref]         b8d3d1db34e17e38325db40cc98eb288118b20a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8d3d1d Update to 0.56.2 (close RHBZ#2537369)