$ git clone -n https://src.fedoraproject.org/rpms/python-xnat.git /var/lib/mock/f39-build-1615973-38643/root/chroot_tmpdir/scmroot/python-xnat
Cloning into '/var/lib/mock/f39-build-1615973-38643/root/chroot_tmpdir/scmroot/python-xnat'...
$ git fetch origin 49067abe47353e3d0b3f90e1bfdb8b6ffd484446:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-xnat
 * [new ref]         49067abe47353e3d0b3f90e1bfdb8b6ffd484446 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49067ab Silence %forgemeta