Change modifiedTime definitions

main-actions/src/main/scala/sbt/compiler/Eval.scala

@@ -488,8 +488,7 @@ private[sbt] object Eval {
     (if (f.isDirectory)
        filesModifiedBytes(f listFiles classDirFilter)
      else
-       bytes(IO.lastModified(f))
-    ) ++ bytes(f.getAbsolutePath)
+       bytes(IO.getModifiedTimeOrZero(f))) ++ bytes(f.getAbsolutePath)
   def fileExistsBytes(f: File): Array[Byte] =
     bytes(f.exists) ++
       bytes(f.getAbsolutePath)

main/src/main/scala/sbt/Defaults.scala

@@ -2315,7 +2315,7 @@ object Classpaths {
         case Some(period) =>
           val fullUpdateOutput = cacheDirectory / "out"
           val now = System.currentTimeMillis
-          val diff = now - IO.lastModified(fullUpdateOutput)
+          val diff = now - IO.getModifiedTimeOrZero(fullUpdateOutput)
           val elapsedDuration = new FiniteDuration(diff, TimeUnit.MILLISECONDS)
           fullUpdateOutput.exists() && elapsedDuration > period
       }

main/src/main/scala/sbt/internal/LibraryManagement.scala

@@ -127,7 +127,7 @@ private[sbt] object LibraryManagement {
   }
 
   private[this] def fileUptodate(file: File, stamps: Map[File, Long]): Boolean =
-    stamps.get(file).forall(_ == IO.lastModified(file))
+    stamps.get(file).forall(_ == IO.getModifiedTimeOrZero(file))
 
   private[sbt] def transitiveScratch(
       lm: DependencyResolution,

project/SiteMap.scala

@@ -68,7 +68,7 @@ object SiteMap {
   // generates a string suitable for a sitemap file representing the last modified time of the given File
   private[this] def lastModifiedString(f: File): String = {
     val formatter = new java.text.SimpleDateFormat("yyyy-MM-dd")
-    // TODO: replace lastModified() with sbt.io.IO.lastModified(), once the build
+    // TODO: replace lastModified() with sbt.io.IO.getModifiedTimeOrZero(), once the build
     // has been upgraded to a version of sbt that includes that call.
     formatter.format(new java.util.Date(f.lastModified))
   }

project/Util.scala

@@ -105,7 +105,7 @@ object Util {
     val timestamp = formatter.format(new Date)
     val content = versionLine(version) + "\ntimestamp=" + timestamp
     val f = dir / "xsbt.version.properties"
-    // TODO: replace lastModified() with sbt.io.IO.lastModified(), once the build
+    // TODO: replace lastModified() with sbt.io.IO.getModifiedTimeOrZero(), once the build
     // has been upgraded to a version of sbt that includes that call.
     if (!f.exists || f.lastModified < lastCompilationTime(analysis) || !containsVersion(f, version)) {
       s.log.info("Writing version information to " + f + " :\n" + content)