$ git clone -n https://src.fedoraproject.org/rpms/TOPCOM.git /var/lib/mock/f40-build-2719490-73007/root/chroot_tmpdir/scmroot/TOPCOM
Cloning into '/var/lib/mock/f40-build-2719490-73007/root/chroot_tmpdir/scmroot/TOPCOM'...
$ git fetch origin 1643096b4f29462b145a3b4a7a849565dbe07068:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/TOPCOM
 * [new ref]         1643096b4f29462b145a3b4a7a849565dbe07068 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1643096 Rebuild for soplex 7.0.0