$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebchannel.git /var/lib/mock/f42-build-side-1-3579939-46816/root/chroot_tmpdir/scmroot/qt5-qtwebchannel
Cloning into '/var/lib/mock/f42-build-side-1-3579939-46816/root/chroot_tmpdir/scmroot/qt5-qtwebchannel'...
$ git fetch origin e16c636dc47707cbee2c2f260b7bc1c598aaadf6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebchannel
 * [new ref]         e16c636dc47707cbee2c2f260b7bc1c598aaadf6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e16c636 5.15.17