$ git clone -n https://src.fedoraproject.org/rpms/plasma5support.git /var/lib/mock/f42-build-side-115155-61068693-6588528/root/chroot_tmpdir/scmroot/plasma5support
Cloning into '/var/lib/mock/f42-build-side-115155-61068693-6588528/root/chroot_tmpdir/scmroot/plasma5support'...
$ git fetch origin 500a4554076926453538e5fdd17b524aa8d93842:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma5support
 * [new ref]         500a4554076926453538e5fdd17b524aa8d93842 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 500a455 6.4.3