$ git clone -n https://src.fedoraproject.org/rpms/python-alembic.git /var/lib/mock/f45-build-29333-637/root/chroot_tmpdir/scmroot/python-alembic
Cloning into '/var/lib/mock/f45-build-29333-637/root/chroot_tmpdir/scmroot/python-alembic'...
$ git fetch origin 18833a9aaa92a0ddc457eec27a1f38900d408a27:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-alembic
 * [new ref]         18833a9aaa92a0ddc457eec27a1f38900d408a27 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18833a9 Update to 1.19.2