$ git clone -n https://src.fedoraproject.org/rpms/gpaw.git /var/lib/mock/f40-build-2404650-60558/root/chroot_tmpdir/scmroot/gpaw
Cloning into '/var/lib/mock/f40-build-2404650-60558/root/chroot_tmpdir/scmroot/gpaw'...
$ git fetch origin 5f79fc61b4c35b598d2b2afa73e8f61498048c96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gpaw
 * [new ref]         5f79fc61b4c35b598d2b2afa73e8f61498048c96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f79fc6 New upstream release