$ git clone -n https://src.fedoraproject.org/rpms/python-pygmars.git /var/lib/mock/f39-build-2159801-50940/root/chroot_tmpdir/scmroot/python-pygmars
Cloning into '/var/lib/mock/f39-build-2159801-50940/root/chroot_tmpdir/scmroot/python-pygmars'...
$ git fetch origin 7cb2ff2118f71157dc1cb735b7dbd213843a7431:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pygmars
 * [new ref]         7cb2ff2118f71157dc1cb735b7dbd213843a7431 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cb2ff2 Initial import