$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtserialport.git /var/lib/mock/f40-build-800423-143529/root/chroot_tmpdir/scmroot/qt5-qtserialport
Cloning into '/var/lib/mock/f40-build-800423-143529/root/chroot_tmpdir/scmroot/qt5-qtserialport'...
$ git fetch origin 6fab6cfd569629401ec6cd6d805a77f2e0d4fcf9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtserialport
 * [new ref]         6fab6cfd569629401ec6cd6d805a77f2e0d4fcf9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fab6cf 5.15.13