$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f41-build-side-1-2674890-29287/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f41-build-side-1-2674890-29287/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin a29cd4456e2bd7c5715727d502306e82bf2cad32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         a29cd4456e2bd7c5715727d502306e82bf2cad32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a29cd44 6.1.90