From cbba1ab70ae7b0df8b9e883ebd81ef6bcdaa39b0 Mon Sep 17 00:00:00 2001
From: JFronny <git@akbvopenfl1.hopto.org>
Date: Sat, 15 Jul 2023 00:00:27 +0200
Subject: [PATCH] support for testing offline via gradle-side reflection hacks
 and firejail

---
 buildSrc/java-offline                         |  2 ++
 .../src/main/kotlin/inceptum.java.gradle.kts  | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100755 buildSrc/java-offline

diff --git a/buildSrc/java-offline b/buildSrc/java-offline
new file mode 100755
index 0000000..7f00408
--- /dev/null
+++ b/buildSrc/java-offline
@@ -0,0 +1,2 @@
+#!/bin/bash
+firejail --net=none "$G_ORIGINAL_EXECUTABLE" "$@"
\ No newline at end of file
diff --git a/buildSrc/src/main/kotlin/inceptum.java.gradle.kts b/buildSrc/src/main/kotlin/inceptum.java.gradle.kts
index 37f5cc8..c97b26f 100644
--- a/buildSrc/src/main/kotlin/inceptum.java.gradle.kts
+++ b/buildSrc/src/main/kotlin/inceptum.java.gradle.kts
@@ -36,4 +36,23 @@ publishing {
             }
         }
     }
+}
+
+afterEvaluate {
+    if (hasProperty("offline")) {
+        tasks.withType(JavaExec::class) {
+            environment("G_ORIGINAL_EXECUTABLE", executable ?: "java")
+            //TODO once we are not using a toolchain, just do executable(rootDir.resolve("buildSrc/java-offline"))
+            val originalMetadata = javaLauncher.get().metadata
+            val field = org.gradle.api.internal.provider.AbstractProperty::class.java.getDeclaredField("value")
+            field.isAccessible = true
+            val customLauncher = object: JavaLauncher {
+                override fun getMetadata(): JavaInstallationMetadata = originalMetadata
+                override fun getExecutablePath(): RegularFile = rootProject.layout.projectDirectory
+                    .dir("buildSrc")
+                    .file("java-offline")
+            }
+            field.set(javaLauncher, org.gradle.api.internal.provider.Providers.of(customLauncher))
+        }
+    }
 }
\ No newline at end of file