$ git clone -n https://src.fedoraproject.org/rpms/PyMca.git /var/lib/mock/f39-build-2437909-60811/root/chroot_tmpdir/scmroot/PyMca
Cloning into '/var/lib/mock/f39-build-2437909-60811/root/chroot_tmpdir/scmroot/PyMca'...
$ git fetch origin f46dfaf046f25d5142380a488882ea8455d18a45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/PyMca
 * [new ref]         f46dfaf046f25d5142380a488882ea8455d18a45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f46dfaf Version 7.2.0