$ git clone -n https://src.fedoraproject.org/rpms/tomlplusplus.git /var/lib/mock/f40-build-2043555-48632/root/chroot_tmpdir/scmroot/tomlplusplus
Cloning into '/var/lib/mock/f40-build-2043555-48632/root/chroot_tmpdir/scmroot/tomlplusplus'...
$ git fetch origin fff94299fe41bc39d42e29a7cf192edb5f4de5c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tomlplusplus
 * [new ref]         fff94299fe41bc39d42e29a7cf192edb5f4de5c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fff9429 update to 3.4.0