From 79bab4727aae3f3bda62be8667d27dcbb7535c41 Mon Sep 17 00:00:00 2001
From: Mark Harrah <dmharrah@gmail.com>
Date: Sun, 1 Jul 2012 15:16:41 -0400
Subject: [PATCH] fix caching of xsbt.version.properties

---
 project/Util.scala | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/project/Util.scala b/project/Util.scala
index 4059ed695..0c3c9a454 100644
--- a/project/Util.scala
+++ b/project/Util.scala
@@ -66,14 +66,17 @@ object Util
 		val formatter = new java.text.SimpleDateFormat("yyyyMMdd'T'HHmmss")
 		formatter.setTimeZone(TimeZone.getTimeZone("GMT"))
 		val timestamp = formatter.format(new Date)
-		val content = "version=" + version + "\ntimestamp=" + timestamp
+		val content = versionLine(version) + "\ntimestamp=" + timestamp
 		val f = dir / "xsbt.version.properties"
-		if(!f.exists || f.lastModified < lastCompilationTime(analysis)) {
+		if(!f.exists || f.lastModified < lastCompilationTime(analysis) || !containsVersion(f, version)) {
 			s.log.info("Writing version information to " + f + " :\n" + content)
 			IO.write(f, content)
 		}
 		f :: Nil
 	}
+	def versionLine(version: String): String = "version=" + version
+	def containsVersion(propFile: File, version: String): Boolean = IO.read(propFile).contains(versionLine(version))
+
 	def binID = "compiler-interface-bin"
 	def srcID = "compiler-interface-src"