$ git clone -n https://src.fedoraproject.org/rpms/python-mpmath.git /var/lib/mock/f40-build-2477020-61595/root/chroot_tmpdir/scmroot/python-mpmath
Cloning into '/var/lib/mock/f40-build-2477020-61595/root/chroot_tmpdir/scmroot/python-mpmath'...
$ git fetch origin 1627cf4541c079dc0291b6ff4908bf5975ab5869:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-mpmath
 * [new ref]         1627cf4541c079dc0291b6ff4908bf5975ab5869 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1627cf4 Restore the doc subpackage