Add workflow to automatically update csa release version.

.github/scripts/update-csa-version.sh

@@ -0,0 +1,167 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+source_repo="signalfx/csa-releases"
+target_repo="${GITHUB_REPOSITORY:?GITHUB_REPOSITORY must be set}"
+base_branch="main"
+target_file="agent-csa-bundle/build.gradle.kts"
+expected_asset="oss-agent-mtagent-extension-deployment.jar"
+
+read_csa_version() {
+  sed -nE 's/^val csaVersion = "([^"]+)"$/\1/p'
+}
+
+release_json="$(gh api "repos/${source_repo}/releases/latest")"
+release_id="$(jq -r '.id' <<< "$release_json")"
+release_tag="$(jq -r '.tag_name' <<< "$release_json")"
+release_url="$(jq -r '.html_url' <<< "$release_json")"
+
+if [[ ! "$release_id" =~ ^[0-9]+$ ]]; then
+  echo "Invalid latest release ID: $release_id" >&2
+  exit 1
+fi
+
+if [[ ! "$release_tag" =~ ^[0-9]+\.[0-9]+\.[0-9]+-[0-9]+$ ]]; then
+  echo "Unsupported CSA release tag: $release_tag" >&2
+  exit 1
+fi
+
+if ! jq -e --arg asset "$expected_asset" \
+  'any(.assets[]; .name == $asset)' <<< "$release_json" >/dev/null; then
+  echo "Latest release $release_tag does not contain $expected_asset" >&2
+  exit 1
+fi
+
+if [[ ! -f "$target_file" ]]; then
+  echo "Target file does not exist: $target_file" >&2
+  exit 1
+fi
+
+mapfile -t current_versions < <(read_csa_version < "$target_file")
+if [[ "${#current_versions[@]}" -ne 1 ]]; then
+  echo "Expected exactly one csaVersion declaration in $target_file" >&2
+  exit 1
+fi
+
+current_version="${current_versions[0]}"
+if [[ "$current_version" == "$release_tag" ]]; then
+  echo "splunk-otel-java already bundles the latest CSA release, $release_tag."
+  exit 0
+fi
+
+# Avoid duplicating a manually-created or differently-named update PR.
+while IFS=$'\t' read -r pr_number pr_url; do
+  if gh pr diff "$pr_number" --repo "$target_repo" |
+    grep -Fx "+val csaVersion = \"${release_tag}\"" >/dev/null; then
+    echo "An update pull request already exists: $pr_url"
+    exit 0
+  fi
+done < <(
+  gh pr list \
+    --repo "$target_repo" \
+    --state open \
+    --limit 100 \
+    --json number,url \
+  --jq '.[] | [.number, .url] | @tsv'
+)
+
+if [[ "${DRY_RUN:-false}" == true ]]; then
+  echo "Would update CSA from $current_version to $release_tag."
+  exit 0
+fi
+
+branch_name="update-csa-version-${release_tag}"
+existing_pr="$(
+  gh pr list \
+    --repo "$target_repo" \
+    --base "$base_branch" \
+    --head "$branch_name" \
+    --state open \
+    --json url \
+    --jq '.[0].url // empty'
+)"
+if [[ -n "$existing_pr" ]]; then
+  echo "An update pull request already exists: $existing_pr"
+  exit 0
+fi
+
+base_sha="$(
+  gh api "repos/${target_repo}/git/ref/heads/${base_branch}" --jq '.object.sha'
+)"
+branch_sha="$(
+  gh api "repos/${target_repo}/git/ref/heads/${branch_name}" \
+    --jq '.object.sha' 2>/dev/null || true
+)"
+needs_commit=true
+
+if [[ -n "$branch_sha" ]]; then
+  remote_version="$(
+    gh api "repos/${target_repo}/contents/${target_file}?ref=${branch_name}" \
+      -H 'Accept: application/vnd.github.raw+json' |
+      read_csa_version
+  )"
+
+  if [[ "$remote_version" == "$release_tag" ]]; then
+    echo "The update commit already exists on $branch_name."
+    needs_commit=false
+  elif [[ "$branch_sha" != "$base_sha" ]]; then
+    echo "Remote branch $branch_name contains unexpected changes; refusing to overwrite it." >&2
+    exit 1
+  fi
+else
+  gh api \
+    --method POST \
+    "repos/${target_repo}/git/refs" \
+    -f ref="refs/heads/${branch_name}" \
+    -f sha="$base_sha" \
+    --silent
+fi
+
+if [[ "$needs_commit" == true ]]; then
+  sed -i.bak -E \
+    "s/^val csaVersion = \"[^\"]+\"$/val csaVersion = \"${release_tag}\"/" \
+    "$target_file"
+  rm -f "${target_file}.bak"
+
+  updated_version="$(read_csa_version < "$target_file")"
+  if [[ "$updated_version" != "$release_tag" ]]; then
+    echo "Failed to update csaVersion in $target_file" >&2
+    exit 1
+  fi
+
+  target_file_sha="$(
+    gh api "repos/${target_repo}/contents/${target_file}?ref=${branch_name}" \
+      --jq '.sha'
+  )"
+  encoded_content="$(base64 < "$target_file" | tr -d '\n')"
+  commit_message="[automated] Update CSA version to $release_tag"
+
+  jq -n \
+    --arg message "$commit_message" \
+    --arg content "$encoded_content" \
+    --arg branch "$branch_name" \
+    --arg sha "$target_file_sha" \
+    '{message: $message, content: $content, branch: $branch, sha: $sha}' |
+    gh api \
+      --method PUT \
+      "repos/${target_repo}/contents/${target_file}" \
+      --input - \
+      --jq '"Created commit " + .commit.sha'
+fi
+
+pr_body="$(cat <<EOF
+Updates the Cisco Secure Application version bundled with splunk-otel-java from \`$current_version\` to \`$release_tag\`.
+
+Source release: $release_url
+
+This pull request was created automatically by the daily CSA version workflow.
+EOF
+)"
+
+gh pr create \
+  --repo "$target_repo" \
+  --base "$base_branch" \
+  --head "$branch_name" \
+  --title "Update CSA version to $release_tag" \
+  --body "$pr_body" \
+  --label automated

.github/workflows/update-csa-version.yml

@@ -0,0 +1,29 @@
+name: Update bundled CSA version
+
+on:
+  schedule:
+    - cron: "17 7 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+concurrency:
+  group: update-csa-version
+  cancel-in-progress: false
+
+jobs:
+  update-csa-version:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: main
+          persist-credentials: false
+
+      - name: Update bundled CSA version
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: .github/scripts/update-csa-version.sh

agent-csa-bundle/README.md

@@ -26,3 +26,11 @@ $ ./gradlew agent-csa-bundle:assemble
 
 The resulting bundle will be located at
 `agent-csa-bundle/build/splunk-otel-javaagent-csa-<version>.jar`.
+
+## Updating the bundled CSA version
+
+The `Update bundled CSA version` GitHub Actions workflow checks the latest
+release in [`signalfx/csa-releases`](https://github.com/signalfx/csa-releases)
+once per day. When that release differs from the `csaVersion` in
+`build.gradle.kts`, the workflow opens an automated pull request with the
+update. The workflow can also be run manually from the Actions tab.