$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtwebchannel.git /var/lib/mock/f40-build-800464-143563/root/chroot_tmpdir/scmroot/qt5-qtwebchannel
Cloning into '/var/lib/mock/f40-build-800464-143563/root/chroot_tmpdir/scmroot/qt5-qtwebchannel'...
$ git fetch origin bd4b8d652344c5420eabcd639f64d092898c687e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtwebchannel
 * [new ref]         bd4b8d652344c5420eabcd639f64d092898c687e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd4b8d6 5.15.13