$ git clone -n https://src.fedoraproject.org/rpms/kcron.git /var/lib/mock/f42-build-3278875-41334/root/chroot_tmpdir/scmroot/kcron
Cloning into '/var/lib/mock/f42-build-3278875-41334/root/chroot_tmpdir/scmroot/kcron'...
$ git fetch origin f3d64e710386dff34beecfcb9362c0aa5464dc7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kcron
 * [new ref]         f3d64e710386dff34beecfcb9362c0aa5464dc7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3d64e7 Rebuild for ppc64le enablement