$ git clone -n https://src.fedoraproject.org/rpms/python-saneyaml.git /var/lib/mock/f39-build-1938297-43141/root/chroot_tmpdir/scmroot/python-saneyaml
Cloning into '/var/lib/mock/f39-build-1938297-43141/root/chroot_tmpdir/scmroot/python-saneyaml'...
$ git fetch origin 8b4ebc2658a600707828e3c6fd846b893e139b84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-saneyaml
 * [new ref]         8b4ebc2658a600707828e3c6fd846b893e139b84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b4ebc2 Initial import