$ git clone -n https://src.fedoraproject.org/rpms/plasma-welcome.git /var/lib/mock/f42-build-862418-170805/root/chroot_tmpdir/scmroot/plasma-welcome
Cloning into '/var/lib/mock/f42-build-862418-170805/root/chroot_tmpdir/scmroot/plasma-welcome'...
$ git fetch origin 5bdf5f6c53a26af46fa161171d053e45b1929868:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-welcome
 * [new ref]         5bdf5f6c53a26af46fa161171d053e45b1929868 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bdf5f6 6.2.4