$ git clone -n https://src.fedoraproject.org/rpms/python-testfixtures.git /var/lib/mock/f40-build-2223514-52743/root/chroot_tmpdir/scmroot/python-testfixtures
Cloning into '/var/lib/mock/f40-build-2223514-52743/root/chroot_tmpdir/scmroot/python-testfixtures'...
$ git fetch origin e608f6e6bf8a2bf4a01126c3f59de48b5aabdc25:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-testfixtures
 * [new ref]         e608f6e6bf8a2bf4a01126c3f59de48b5aabdc25 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e608f6e Update to latest upstream release 7.2.2 (closes rhbz#2139114)