$ git clone -n https://src.fedoraproject.org/rpms/python-pyfakefs.git /var/lib/mock/f41-build-side-1-2755428-31311/root/chroot_tmpdir/scmroot/python-pyfakefs
Cloning into '/var/lib/mock/f41-build-side-1-2755428-31311/root/chroot_tmpdir/scmroot/python-pyfakefs'...
$ git fetch origin f77130c4cb5bf1e3408176cc4ebe34e8c63fad86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pyfakefs
 * [new ref]         f77130c4cb5bf1e3408176cc4ebe34e8c63fad86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f77130c Update to 5.6.0 (rhbz#2221762)