$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f45-build-28596-631/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f45-build-28596-631/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin e1ac0af616cd9042df8044cf8aadd05be1598232:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         e1ac0af616cd9042df8044cf8aadd05be1598232 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1ac0af 6.7.5