$ git clone -n https://src.fedoraproject.org/rpms/python-decorator.git /var/lib/mock/f45-build-30270-643/root/chroot_tmpdir/scmroot/python-decorator
Cloning into '/var/lib/mock/f45-build-30270-643/root/chroot_tmpdir/scmroot/python-decorator'...
$ git fetch origin 9fd29ef8bfe64a3a64933fe5b2e83caee614c43b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-decorator
 * [new ref]         9fd29ef8bfe64a3a64933fe5b2e83caee614c43b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fd29ef Update to 5.3.1