$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtwebchannel.git /var/lib/mock/f38-build-723772-99288/root/chroot_tmpdir/scmroot/qt6-qtwebchannel
Cloning into '/var/lib/mock/f38-build-723772-99288/root/chroot_tmpdir/scmroot/qt6-qtwebchannel'...
$ git fetch origin a91b98780a115aa6a65db8956c59b7ca6deffb6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtwebchannel
 * [new ref]         a91b98780a115aa6a65db8956c59b7ca6deffb6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a91b987 6.5.1