$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtserialport.git /var/lib/mock/f41-build-847183-163786/root/chroot_tmpdir/scmroot/qt5-qtserialport
Cloning into '/var/lib/mock/f41-build-847183-163786/root/chroot_tmpdir/scmroot/qt5-qtserialport'...
$ git fetch origin b2b68a018711e3b2bcb4ca80a122686beb07d01a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtserialport
 * [new ref]         b2b68a018711e3b2bcb4ca80a122686beb07d01a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2b68a0 5.15.15