$ git clone -n https://src.fedoraproject.org/rpms/python-mnemonic.git /var/lib/mock/f40-build-2203746-51938/root/chroot_tmpdir/scmroot/python-mnemonic
Cloning into '/var/lib/mock/f40-build-2203746-51938/root/chroot_tmpdir/scmroot/python-mnemonic'...
$ git fetch origin 4052d8b83ee50994c78a92c190ab9eb37d44f60d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-mnemonic
 * [new ref]         4052d8b83ee50994c78a92c190ab9eb37d44f60d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4052d8b Use %{version} for source1 instead of hardcoded 0.20