$ git clone -n https://src.fedoraproject.org/rpms/bouncycastle.git /var/lib/mock/f41-build-1465475-23647/root/chroot_tmpdir/scmroot/bouncycastle
Cloning into '/var/lib/mock/f41-build-1465475-23647/root/chroot_tmpdir/scmroot/bouncycastle'...
$ git fetch origin 5168a17a5af1ae54c6a697f5f75022b38f66c44e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bouncycastle
 * [new ref]         5168a17a5af1ae54c6a697f5f75022b38f66c44e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5168a17 Forgotten macro usage