$ git clone -n https://src.fedoraproject.org/rpms/python-s3transfer.git /var/lib/mock/f40-build-58900489-6569009/root/chroot_tmpdir/scmroot/python-s3transfer
Cloning into '/var/lib/mock/f40-build-58900489-6569009/root/chroot_tmpdir/scmroot/python-s3transfer'...
$ git fetch origin 699c83fe6cf8bae24fb6f0d50a4b6cbd4738c9f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-s3transfer
 * [new ref]         699c83fe6cf8bae24fb6f0d50a4b6cbd4738c9f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 699c83f 0.11.5