commit cf3b9736bb0076e58df26e9cd8c9ba0dd3e4d515
author Fabian Meumertzheim <fabian@meumertzhe.im> Tue Nov 21 21:38:24 2023
committer Javac Team <javac-team+copybara@google.com> Tue Nov 21 21:39:15 2023
tree 5a692bde8769a29fce80b6979a4ed4200c67637a
parent 33ed406f653ecfda611933103261a6ad3146dbd5

Allow path to `ct.sym` to be specified via a system property

When turbine is compiled into a native image, no JAVA_HOME will be available at runtime and the `java.home` system property won't be set. To still provide support for `--release` in that situation, the new `turbine.ctSymPath` system property can be set to give turbine the required access to `ct.sym`.

Work towards https://github.com/bazelbuild/stardoc/issues/195#issuecomment-1821286258

Fixes #296

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/turbine/pull/296 from fmeum:ctsym b74452bb7e2cfbcad28f80c35182f7469cacb11a
PiperOrigin-RevId: 584416598

java/com/google/turbine/binder/CtSymClassBinder.java

diff --git a/java/com/google/turbine/binder/CtSymClassBinder.java b/java/com/google/turbine/binder/CtSymClassBinder.java
index f0e21f2..f7ead38 100644
--- a/java/com/google/turbine/binder/CtSymClassBinder.java
+++ b/java/com/google/turbine/binder/CtSymClassBinder.java
@@ -48,11 +48,20 @@
   private static final int FEATURE_VERSION = Runtime.version().feature();
 
   public static @Nullable ClassPath bind(int version) throws IOException {
-    String javaHome = JAVA_HOME.value();
-    requireNonNull(javaHome, "attempted to use --release, but JAVA_HOME is not set");
-    Path ctSym = Paths.get(javaHome).resolve("lib/ct.sym");
-    if (!Files.exists(ctSym)) {
-      throw new IllegalStateException("lib/ct.sym does not exist in " + javaHome);
+    Path ctSym;
+    String explicitCtSymPath = System.getProperty("turbine.ctSymPath");
+    if (explicitCtSymPath == null) {
+      String javaHome = JAVA_HOME.value();
+      requireNonNull(javaHome, "attempted to use --release, but JAVA_HOME is not set");
+      ctSym = Paths.get(javaHome).resolve("lib/ct.sym");
+      if (!Files.exists(ctSym)) {
+        throw new IllegalStateException("lib/ct.sym does not exist in " + javaHome);
+      }
+    } else {
+      ctSym = Paths.get(explicitCtSymPath);
+      if (!Files.exists(ctSym)) {
+        throw new IllegalStateException("ct.sym does not exist at " + ctSym);
+      }
     }
     Map<ClassSymbol, BytecodeBoundClass> map = new HashMap<>();
     Map<ModuleSymbol, ModuleInfo> modules = new HashMap<>();