$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f41-build-1054031-19289/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f41-build-1054031-19289/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin 686bdf92a09eebe3096ef3909cf1e1e786fcd4d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         686bdf92a09eebe3096ef3909cf1e1e786fcd4d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 686bdf9 fix: rebuild