$ git clone -n https://src.fedoraproject.org/rpms/gpaw.git /var/lib/mock/f42-build-888759-188755/root/chroot_tmpdir/scmroot/gpaw
Cloning into '/var/lib/mock/f42-build-888759-188755/root/chroot_tmpdir/scmroot/gpaw'...
$ git fetch origin beb467bcd40985589b494143e614c2a67ca89698:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gpaw
 * [new ref]         beb467bcd40985589b494143e614c2a67ca89698 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at beb467b New upstream release