test: add downstream check for spring-cloud-gcp (#3092)

Fixes https://togithub.com/googleapis/sdk-platform-java/issues/2534

The check takes 2 minutes

.github/workflows/downstream.yaml

@@ -47,3 +47,20 @@ jobs:
         run: ./.kokoro/presubmit/common_test.sh
       - name: Perform downstream compatibility testing
         run: REPOS_UNDER_TEST="${{ matrix.repo }}" ./.kokoro/presubmit/downstream-compatibility.sh
+  downstream-compatibility-spring-generator:
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: temurin
+      - run: mvn -version
+      - name: Install xmllint
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install libxml2-utils
+      - name: Perform downstream compatibility testing
+        run: ./.kokoro/presubmit/downstream-compatibility-spring.sh

.kokoro/presubmit/common.sh

@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+commonScriptDir=$(realpath "$(dirname "${BASH_SOURCE[0]}")")
+
 # In the given directory ($1),
 #   update the pom.xml's dependency on the given artifact ($2) to the given version ($3)
 # ex: update_dependency google-cloud-java/google-cloud-jar-parent google-cloud-shared-dependencies 1.2.3
@@ -70,20 +72,41 @@ function parse_pom_version {
 # ex: find_last_release_version java-bigtable
 # ex: find_last_release_version java-storage 2.22.x
 function find_last_release_version {
+  repo=$1
   branch=${2-"main"} # Default to using main branch
-  curl -s -o "versions_$1.txt" "https://raw.githubusercontent.com/googleapis/$1/$branch/versions.txt"
+  org=${3-"googleapis"}
+  curl -s -o "versions_${repo}.txt" "https://raw.githubusercontent.com/${org}/${repo}/${branch}/versions.txt"
 
   # First check to see if there's an entry for the overall repo. Used for google-cloud-java.
-  primary_artifact=$(grep -E "^$1" "versions_$1.txt" | head -n 1)
-  if [ -z "$primary_artifact" ]; then
+  primary_artifact=$(grep -E "^${repo}" "versions_${repo}.txt" | head -n 1)
+  if [ -z "${primary_artifact}" ]; then
     # Otherwise, use the first google-cloud-* artifact's version.
     primary_artifact=$(grep -E "^google-cloud-" "versions_$1.txt" | head -n 1)
   fi
-  if [ -z "$primary_artifact" ]; then
+  if [ -z "${primary_artifact}" ]; then
     echo "Unable to identify primary artifact for $1"
     exit 1
   fi
 
   parts=($(echo "$primary_artifact" | tr ":" "\n"))
   echo "${parts[1]}"
 }
+
+# copies settings.xml from the root of sdk-platform-java into Maven's home
+# folder
+function setup_maven_mirror {
+  echo "Setup maven mirror"
+  mkdir -p "${HOME}/.m2"
+  cp "${commonScriptDir}/../../settings.xml" "${HOME}/.m2"
+}
+
+function install_repo_modules {
+  target_projects="$1"
+  projects_arg=""
+  if [ -n "${target_projects}" ]; then
+    projects_arg="--projects ${target_projects}"
+  fi
+  echo "Installing this repo's modules to local maven."
+  mvn -q -B -ntp install ${projects_arg} \
+    -Dcheckstyle.skip -Dfmt.skip -DskipTests -T 1C
+}

.kokoro/presubmit/downstream-compatibility-spring.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+# Copyright 2024 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.
+
+# This script is only meant to test spring-cloud-gpc, specifically on its
+# autoconfig generation workflow
+
+set -eox pipefail
+
+# Get the directory of the build script
+scriptDir=$(realpath "$(dirname "${BASH_SOURCE[0]}")")
+cd "${scriptDir}/../.." # cd to the root of this repo
+source "$scriptDir/common.sh"
+
+install_repo_modules
+GAPIC_GENERATOR_VERSION=$(parse_pom_version "gapic-generator-java-bom")
+echo "Install complete. gapic-generator-java-bom = $GAPIC_GENERATOR_VERSION"
+
+pushd gapic-generator-java/target
+# Download and configure spring-cloud-gcp for testing
+last_release=$(find_last_release_version "spring-cloud-gcp" "main" "GoogleCloudPlatform")
+git clone "https://github.com/GoogleCloudPlatform/spring-cloud-gcp.git" --depth=1 --branch "v$last_release"
+update_all_poms_dependency "spring-cloud-gcp" "gapic-generator-java-bom" "${GAPIC_GENERATOR_VERSION}"
+
+# Install spring-cloud-gcp modules
+pushd spring-cloud-gcp/spring-cloud-generator
+../mvnw \
+  -U \
+  --batch-mode \
+  --no-transfer-progress \
+  --show-version \
+  --threads 1.5C \
+  --define maven.test.skip=true \
+  --define maven.javadoc.skip=true \
+  install
+
+
+# Generate showcase autoconfig
+./scripts/generate-showcase.sh
+pushd showcase/showcase-spring-starter
+mvn verify
+popd # showcase/showcase-spring-starter
+
+popd # spring-cloud-gcp/spring-cloud-generator
+popd # gapic-generator-java/target

.kokoro/presubmit/downstream-compatibility.sh

@@ -21,18 +21,15 @@ if [ -z "${REPOS_UNDER_TEST}" ]; then
   exit 1
 fi
 
+
 # Get the directory of the build script
 scriptDir=$(realpath "$(dirname "${BASH_SOURCE[0]}")")
 cd "${scriptDir}/../.." # cd to the root of this repo
 source "$scriptDir/common.sh"
 
-echo "Setup maven mirror"
-mkdir -p "${HOME}/.m2"
-cp settings.xml "${HOME}/.m2"
+setup_maven_mirror
 
-echo "Installing this repo's modules to local maven."
-mvn -q -B -ntp install --projects '!gapic-generator-java' \
-  -Dcheckstyle.skip -Dfmt.skip -DskipTests -T 1C
+install_repo_modules '!gapic-generator-java'
 SHARED_DEPS_VERSION=$(parse_pom_version java-shared-dependencies)
 echo "Install complete. java-shared-dependencies = $SHARED_DEPS_VERSION"