1 files changed, 21 insertions, 0 deletions
diff --git a/project/build/BuildInfoEnvironment.scala b/project/build/BuildInfoEnvironment.scala
new file mode 100644
index 0000000000..682b8af5da
--- /dev/null
+++ b/project/build/BuildInfoEnvironment.scala
@@ -0,0 +1,21 @@
+import sbt._
+trait BuildInfoEnvironment{
+  self : Project =>
+  def buildInfoEnvironmentLocation:Path
+  /**
+   * Environment for storing properties that
+   * 1) need to be saved across sbt session
+   * 2) Are local to a layer
+   * Used to save the last version of the compiler used to build the layer (for discarding it's product if necessary)
+   */
+  lazy val layerEnvironment = new BasicEnvironment {
+    // use the project's Logger for any properties-related logging
+    def log = self.log
+
+    // the properties file will be read/stored
+    def envBackingPath = buildInfoEnvironmentLocation
+    // define some properties
+    lazy val lastCompilerVersion:Property[String] = propertyOptional[String]("")
+  }
+
+}