$ git clone -n https://src.fedoraproject.org/rpms/volpack.git /var/lib/mock/f40-build-797972-141642/root/chroot_tmpdir/scmroot/volpack
Cloning into '/var/lib/mock/f40-build-797972-141642/root/chroot_tmpdir/scmroot/volpack'...
$ git fetch origin 85abad404aa3ca892c0eb5fb797c1983334a9510:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/volpack
 * [new ref]         85abad404aa3ca892c0eb5fb797c1983334a9510 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85abad4 fix casts to resolve FTBFS