$ git clone -n https://src.fedoraproject.org/rpms/python-boltons.git /var/lib/mock/f45-build-29797-641/root/chroot_tmpdir/scmroot/python-boltons
Cloning into '/var/lib/mock/f45-build-29797-641/root/chroot_tmpdir/scmroot/python-boltons'...
$ git fetch origin 4b1b787796dd9a10d2a9bc730c9e9ec0f2f1b044:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boltons
 * [new ref]         4b1b787796dd9a10d2a9bc730c9e9ec0f2f1b044 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b1b787 Update to 26.1.0 upstream release