$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f40-build-1495490-23854/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f40-build-1495490-23854/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin 215e15a47f8dddf520d14fabe9753e268f07e7db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         215e15a47f8dddf520d14fabe9753e268f07e7db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 215e15a 6.1.2