Make all toolchains available to test

Author: smowton

java/ql/integration-tests/all-platforms/java/buildless-sibling-projects/test.py

@@ -2,10 +2,40 @@
 from diagnostics_test_utils import *
 from buildless_test_utils import *
 
+import tempfile
+import os.path
+import sys
+
 #The version of gradle used doesn't work on java 17
 try_use_java11()
 
-run_codeql_database_create([], lang="java", extra_env={"CODEQL_EXTRACTOR_JAVA_OPTION_BUILDLESS": "true", "CODEQL_EXTRACTOR_JAVA_OPTION_BUILDLESS_CLASSPATH_FROM_BUILD_FILES": "true"})
+# On actions, expose all usable toolchains so that we can test version-selection logic.
+
+toolchains_dir = tempfile.mkdtemp(prefix="integration-tests-toolchains-")
+toolchains_file = os.path.join(toolchains_dir, "toolchains.xml")
+
+with open(toolchains_file, "w") as f:
+  f.write('<?xml version="1.0" encoding="UTF-8"?>\n<toolchains>\n')
+
+  for v in [8, 11, 17, 21]:
+    homedir = os.getenv("JAVA_HOME_%d_X64" % v)
+    if homedir is not None and homedir != "":
+      f.write("""
+        <toolchain>
+          <type>jdk</type>
+          <provides>
+            <version>%d</version>
+            <vendor>oracle</vendor>
+          </provides>
+          <configuration>
+            <jdkHome>%s</jdkHome>
+          </configuration>
+        </toolchain>
+        """ % (v, homedir))
+
+  f.write("</toolchains>")
+
+run_codeql_database_create([], lang="java", extra_env={"CODEQL_EXTRACTOR_JAVA_OPTION_BUILDLESS": "true", "CODEQL_EXTRACTOR_JAVA_OPTION_BUILDLESS_CLASSPATH_FROM_BUILD_FILES": "true", "LGTM_INDEX_MAVEN_TOOLCHAINS_FILE": toolchains_file})
 
 check_diagnostics()
 check_buildless_fetches()