$ git clone -n https://src.fedoraproject.org/rpms/python-feedgen.git /var/lib/mock/f40-build-2213638-52344/root/chroot_tmpdir/scmroot/python-feedgen
Cloning into '/var/lib/mock/f40-build-2213638-52344/root/chroot_tmpdir/scmroot/python-feedgen'...
$ git fetch origin aa3e3983c9b7a9a43e87148d694c4c3086f8cb30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-feedgen
 * [new ref]         aa3e3983c9b7a9a43e87148d694c4c3086f8cb30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa3e398 Convert to %autorelease and %autochangelog