-build_vpp_ubuntu_amd64 "CURRENT" || die
-set_aside_commit_build_artifacts || die
-build_vpp_ubuntu_amd64 "PARENT" || die
-set_aside_parent_build_artifacts || die
-## Replace previous 4 lines with this to speed up testing.
-#download_builds "REPLACE_WITH_URL" || die
-initialize_csit_dirs || die
+git status || die
+git describe || die
+build_vpp_ubuntu "CURRENT" || die
+set_aside_build_artifacts "current" || die
+git checkout "HEAD~" || die "Failed to checkout parent commit."
+git status || die
+git describe || die
+build_vpp_ubuntu "PARENT" || die
+set_aside_build_artifacts "parent" || die
+initialize_csit_dirs "parent" "current" || die