$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f41-build-824537-154178/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f41-build-824537-154178/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin 5d53f918e16af86cee41ca46b9bd6145a23916c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         5d53f918e16af86cee41ca46b9bd6145a23916c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d53f91 rebuild