$ git clone -n https://src.fedoraproject.org/rpms/pygobject3.git /var/lib/mock/f40-build-796669-140843/root/chroot_tmpdir/scmroot/pygobject3
Cloning into '/var/lib/mock/f40-build-796669-140843/root/chroot_tmpdir/scmroot/pygobject3'...
$ git fetch origin 9dc560e289f46c0ad7caea0a4a2b239c083c2534:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pygobject3
 * [new ref]         9dc560e289f46c0ad7caea0a4a2b239c083c2534 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9dc560e Use gtk3 in tests