$ git clone -n https://src.fedoraproject.org/rpms/sympy.git /var/lib/mock/f38-build-side-42-init-devel-1092314-30062/root/chroot_tmpdir/scmroot/sympy
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1092314-30062/root/chroot_tmpdir/scmroot/sympy'...
$ git fetch origin 0ef50362dea96f5c84362dd96d90bdad8080826a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sympy
 * [new ref]         0ef50362dea96f5c84362dd96d90bdad8080826a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ef5036 Fix the antlr4 Recommends (bz 2172030).