$ git clone -n https://src.fedoraproject.org/rpms/python-peewee.git /var/lib/mock/f40-build-2121074-50739/root/chroot_tmpdir/scmroot/python-peewee
Cloning into '/var/lib/mock/f40-build-2121074-50739/root/chroot_tmpdir/scmroot/python-peewee'...
$ git fetch origin f7a1b0e6e99887091074109682c9423cc0142634:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-peewee
 * [new ref]         f7a1b0e6e99887091074109682c9423cc0142634 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7a1b0e New source for 3.17.0