build: fix kokoro docs-presubmit build (googleapis#685)

Fixes googleapis#682

.kokoro/build.sh

@@ -27,23 +27,27 @@ export PYTHONUNBUFFERED=1
 # Debug: show build environment
 env | grep KOKORO
 
-# Setup service account credentials.
-export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
+if [[ -f "${KOKORO_GFILE_DIR}/service-account.json" ]]; then
+  # Setup service account credentials.
+  export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
+fi
 
 # Setup project id.
 export PROJECT_ID=$(cat "${KOKORO_GFILE_DIR}/project-id.json")
 
-# Configure local Redis to be used
-export REDIS_CACHE_URL=redis://localhost
-redis-server &
+if [[ -f "${KOKORO_GFILE_DIR}/service-account.json" ]]; then
+  # Configure local Redis to be used
+  export REDIS_CACHE_URL=redis://localhost
+  redis-server &
 
-# Configure local memcached to be used
-export MEMCACHED_HOSTS=127.0.0.1
-service memcached start
+  # Configure local memcached to be used
+  export MEMCACHED_HOSTS=127.0.0.1
+  service memcached start
 
-# Some system tests require indexes. Use gcloud to create them.
-gcloud auth activate-service-account --key-file=$GOOGLE_APPLICATION_CREDENTIALS --project=$PROJECT_ID
-gcloud --quiet --verbosity=debug datastore indexes create tests/system/index.yaml
+  # Some system tests require indexes. Use gcloud to create them.
+  gcloud auth activate-service-account --key-file=$GOOGLE_APPLICATION_CREDENTIALS --project=$PROJECT_ID
+  gcloud --quiet --verbosity=debug datastore indexes create tests/system/index.yaml
+fi
 
 
 # Remove old nox

.kokoro/docs/docs-presubmit.cfg

@@ -24,5 +24,5 @@ env_vars: {
 # Only run this nox session.
 env_vars: {
     key: "NOX_SESSION"
-    value: "docs docfx"
+    value: "docs"
 }

.trampolinerc

@@ -0,0 +1,52 @@
+# Copyright 2020 Google LLC
+#
+# 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.
+
+# Template for .trampolinerc
+
+# Add required env vars here.
+required_envvars+=(
+    "STAGING_BUCKET"
+    "V2_STAGING_BUCKET"
+)
+
+# Add env vars which are passed down into the container here.
+pass_down_envvars+=(
+    "STAGING_BUCKET"
+    "V2_STAGING_BUCKET"
+    "NOX_SESSION"
+)
+
+# Prevent unintentional override on the default image.
+if [[ "${TRAMPOLINE_IMAGE_UPLOAD:-false}" == "true" ]] && \
+   [[ -z "${TRAMPOLINE_IMAGE:-}" ]]; then
+   echo "Please set TRAMPOLINE_IMAGE if you want to upload the Docker image."
+   exit 1
+fi
+
+# Define the default value if it makes sense.
+if [[ -z "${TRAMPOLINE_IMAGE_UPLOAD:-}" ]]; then
+    TRAMPOLINE_IMAGE_UPLOAD=""
+fi
+
+if [[ -z "${TRAMPOLINE_IMAGE:-}" ]]; then
+    TRAMPOLINE_IMAGE=""
+fi
+
+if [[ -z "${TRAMPOLINE_DOCKERFILE:-}" ]]; then
+    TRAMPOLINE_DOCKERFILE=""
+fi
+
+if [[ -z "${TRAMPOLINE_BUILD_FILE:-}" ]]; then
+    TRAMPOLINE_BUILD_FILE=""
+fi

owlbot.py

@@ -23,19 +23,30 @@
 
 s.replace(".kokoro/build.sh", """(export PROJECT_ID=.*)""", """\g<1>
 
-# Configure local Redis to be used
-export REDIS_CACHE_URL=redis://localhost
-redis-server &
-
-# Configure local memcached to be used
-export MEMCACHED_HOSTS=127.0.0.1
-service memcached start
-
-# Some system tests require indexes. Use gcloud to create them.
-gcloud auth activate-service-account --key-file=$GOOGLE_APPLICATION_CREDENTIALS --project=$PROJECT_ID
-gcloud --quiet --verbosity=debug datastore indexes create tests/system/index.yaml
+if [[ -f "${KOKORO_GFILE_DIR}/service-account.json" ]]; then
+  # Configure local Redis to be used
+  export REDIS_CACHE_URL=redis://localhost
+  redis-server &
+
+  # Configure local memcached to be used
+  export MEMCACHED_HOSTS=127.0.0.1
+  service memcached start
+
+  # Some system tests require indexes. Use gcloud to create them.
+  gcloud auth activate-service-account --key-file=$GOOGLE_APPLICATION_CREDENTIALS --project=$PROJECT_ID
+  gcloud --quiet --verbosity=debug datastore indexes create tests/system/index.yaml
+fi
 """)
 
+s.replace(".kokoro/build.sh", 
+  """# Setup service account credentials.
+export GOOGLE_APPLICATION_CREDENTIALS=\$\{KOKORO_GFILE_DIR\}/service-account.json""",
+  """if [[ -f "${KOKORO_GFILE_DIR}/service-account.json" ]]; then
+  # Setup service account credentials.
+  export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
+fi"""
+)
+
 s.replace(
     ".kokoro/docker/docs/Dockerfile",
     "libsqlite3-dev.*\n",
@@ -51,6 +62,12 @@
 """
 )
 
+assert 1 == s.replace(
+    ".kokoro/docs/docs-presubmit.cfg",
+    'value: "docs docfx"',
+    'value: "docs"',
+)
+
 s.shell.run(["nox", "-s", "blacken"], hide_output=False)
 
 # ----------------------------------------------------------------------------