$ git clone -n https://src.fedoraproject.org/rpms/python-pytoolconfig.git /var/lib/mock/f40-build-2135711-50815/root/chroot_tmpdir/scmroot/python-pytoolconfig
Cloning into '/var/lib/mock/f40-build-2135711-50815/root/chroot_tmpdir/scmroot/python-pytoolconfig'...
$ git fetch origin 96f778cc765477ff10cc2fda5d2ee68558f8e5a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pytoolconfig
 * [new ref]         96f778cc765477ff10cc2fda5d2ee68558f8e5a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96f778c Update to 1.2.6 (close RHBZ#2244235)