$ git clone -n https://src.fedoraproject.org/rpms/synapse.git /var/lib/mock/f40-build-2261021-54425/root/chroot_tmpdir/scmroot/synapse
Cloning into '/var/lib/mock/f40-build-2261021-54425/root/chroot_tmpdir/scmroot/synapse'...
$ git fetch origin 47087dc7e156161bc354fcb8cd0cbc469cc8e375:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/synapse
 * [new ref]         47087dc7e156161bc354fcb8cd0cbc469cc8e375 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47087dc Change -Wincompatible-pointer-types from error to warning