Add Kokoro configs for publishing Kythe xrefs.

PiperOrigin-RevId: 284835614

kokoro/kythe/generate_xrefs.cfg

@@ -0,0 +1,28 @@
+build_file: "gvisor/kokoro/kythe/generate_xrefs.sh"
+
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73898
+      keyname: "kokoro-rbe-service-account"
+    }
+  }
+}
+
+bazel_setting {
+  project_id: "gvisor-rbe"
+  local_execution: false
+  auth_credential: {
+    keystore_config_id: 73898
+    keyname: "kokoro-rbe-service-account"
+  }
+  bes_backend_address: "buildeventservice.googleapis.com"
+  foundry_backend_address: "remotebuildexecution.googleapis.com"
+  upsalite_frontend_address: "https://source.cloud.google.com"
+}
+
+action {
+  define_artifacts {
+    regex: "*.kzip"
+  }
+}

kokoro/kythe/generate_xrefs.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+# Copyright 2019 The gVisor Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -ex
+
+# Install the latest version of Bazel. The default on Kokoro images is out of
+# date.
+if command -v use_bazel.sh >/dev/null; then
+  use_bazel.sh latest
+fi
+bazel version
+
+# We need to use python 3.6 (the Kokoro PY3 default is 3.4) to compile `//...`
+# because benchmarktools requires a version of `requests` that is not a
+# available in 3.4.
+pyenv versions
+pyenv global 3.6.1
+
+readonly KYTHE_VERSION='v0.0.37'
+readonly WORKDIR="$(mktemp -d)"
+readonly KYTHE_DIR="${WORKDIR}/kythe-${KYTHE_VERSION}"
+if [[ -n "$KOKORO_GIT_COMMIT" ]]; then
+  readonly KZIP_FILENAME="${KOKORO_ARTIFACTS_DIR}/${KOKORO_GIT_COMMIT}.kzip"
+else
+  readonly KZIP_FILENAME="$(git rev-parse HEAD).kzip"
+fi
+
+wget -q -O "${WORKDIR}/kythe.tar.gz" \
+  "https://github.com/kythe/kythe/releases/download/${KYTHE_VERSION}/kythe-${KYTHE_VERSION}.tar.gz"
+tar --no-same-owner -xzf "${WORKDIR}/kythe.tar.gz" --directory "$WORKDIR"
+
+if [[ -n "$KOKORO_ARTIFACTS_DIR" ]]; then
+  cd "${KOKORO_ARTIFACTS_DIR}/github/gvisor"
+fi
+bazel \
+  --bazelrc="${KYTHE_DIR}/extractors.bazelrc" \
+  build \
+  --override_repository kythe_release="${KYTHE_DIR}" \
+  --define=kythe_corpus=gvisor.dev \
+  //...
+
+"${KYTHE_DIR}/tools/kzip" merge \
+  --output "$KZIP_FILENAME" \
+  $(find -L bazel-out/*/extra_actions/ -name '*.kzip')