$ git clone -n https://src.fedoraproject.org/rpms/python-specfile.git /var/lib/mock/f45-build-32993-665/root/chroot_tmpdir/scmroot/python-specfile
Cloning into '/var/lib/mock/f45-build-32993-665/root/chroot_tmpdir/scmroot/python-specfile'...
$ git fetch origin b786d31324e70b0101148202dce548351110150b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-specfile
 * [new ref]         b786d31324e70b0101148202dce548351110150b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b786d31 Update to 0.41.1 upstream release