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bench/reachability-benchmark/tools/java/ensure_jdk.sh

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+#!/usr/bin/env bash
+# Offline-friendly helper to make a JDK available for benchmark builds.
+# Order of preference:
+# 1) Respect an existing JAVA_HOME when it contains javac.
+# 2) Use javac from PATH when present.
+# 3) Extract a vendored archive (jdk-21.0.1.tar.gz) into .jdk/ and use it.
+
+ensure_bench_jdk() {
+  # Re-use an explicitly provided JAVA_HOME when it already has javac.
+  if [[ -n "${JAVA_HOME:-}" && -x "${JAVA_HOME}/bin/javac" ]]; then
+    export PATH="${JAVA_HOME}/bin:${PATH}"
+    return 0
+  fi
+
+  # Use any javac already on PATH.
+  if command -v javac >/dev/null 2>&1; then
+    return 0
+  fi
+
+  local script_dir bench_root cache_dir archive_dir archive_path candidate
+  script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+  bench_root="$(cd "${script_dir}/../.." && pwd)"
+  repo_root="$(cd "${bench_root}/../.." && pwd)"
+  cache_dir="${bench_root}/.jdk"
+  archive_dir="${cache_dir}/jdk-21.0.1+12"
+
+  # Prefer an archive co-located with this script; fall back to the repo copy.
+  for candidate in \
+    "${script_dir}/jdk-21.0.1.tar.gz" \
+    "${repo_root}/src/Sdk/StellaOps.Sdk.Generator/tools/jdk-21.0.1.tar.gz"
+  do
+    if [[ -f "${candidate}" ]]; then
+      archive_path="${candidate}"
+      break
+    fi
+  done
+
+  if [[ -z "${archive_path:-}" ]]; then
+    echo "[ensure_jdk] No JDK found. Set JAVA_HOME or place jdk-21.0.1.tar.gz under tools/java/." >&2
+    return 1
+  fi
+
+  mkdir -p "${cache_dir}"
+  if [[ ! -d "${archive_dir}" ]]; then
+    tar -xzf "${archive_path}" -C "${cache_dir}"
+  fi
+
+  if [[ ! -x "${archive_dir}/bin/javac" ]]; then
+    echo "[ensure_jdk] Extracted archive but javac not found under ${archive_dir}" >&2
+    return 1
+  fi
+
+  export JAVA_HOME="${archive_dir}"
+  export PATH="${JAVA_HOME}/bin:${PATH}"
+}
+
+# Allow running as a script for quick verification.
+if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
+  if ensure_bench_jdk; then
+    java -version
+  fi
+fi