1 files changed, 42 insertions, 0 deletions
diff --git a/examples/package-example/build/build.scala b/examples/package-example/build/build.scala
new file mode 100644
index 0000000..3874507
--- /dev/null
+++ b/examples/package-example/build/build.scala
@@ -0,0 +1,42 @@
+package package_example_build
+import java.nio.file._
+import java.security.MessageDigest
+import cbt._
+class Build(val context: Context) extends BaseBuild with PackageJars {
+  override def groupId = "org.example"
+  override def version = "1.0.0"
+
+  def hash(file: Path): String = {
+    val digest = MessageDigest.getInstance("SHA-256");
+    val in = Files.newInputStream(file)
+    try {
+      val chunk = new Array[Byte](4096)
+      while(in.read(chunk) > 0) {
+        digest.update(chunk)
+      }
+    } finally {
+      in.close
+    }
+    val bytes = digest.digest()
+    val builder = new StringBuilder(bytes.length * 2);
+    for(b <- bytes) {
+      builder.append(f"$b%02x")
+    }
+    builder.toString
+  }
+
+  override def run = {
+    val pass1 = super.`package`.map(f => hash(f.toPath))
+    lib.clean(cleanFiles, true, false, false, false)
+    transientCache.clear()
+    val pass2 = super.`package`.map(f => hash(f.toPath))
+
+    assert(
+      pass1 == pass2,
+      "The checksums of jars generated during two separate builds did not match. " +
+        "The build is not reproducible."
+    )
+    ExitCode.Success
+  }
+
+}