$ git clone -n https://src.fedoraproject.org/rpms/synfig.git /var/lib/mock/f40-build-2309372-57344/root/chroot_tmpdir/scmroot/synfig
Cloning into '/var/lib/mock/f40-build-2309372-57344/root/chroot_tmpdir/scmroot/synfig'...
$ git fetch origin 1e06ef4b1c4f04f34ef522a172e57dd8dbe39ee5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/synfig
 * [new ref]         1e06ef4b1c4f04f34ef522a172e57dd8dbe39ee5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e06ef4 Rebuilt for Boost 1.83