fix regression where .deb ended up with wrong name on server

this happened when we upgraded sbt-native-packager from 0.6.x
to 1.0.x; the new version calculates this differently

Author: SethTisue

project/ScalaDist.scala

@@ -40,7 +40,15 @@ object ScalaDist {
       mappings in upload += uploadMapping(packageZipTarball in UniversalDocs).value,
       mappings in upload += uploadMapping(packageXzTarball in UniversalDocs).value,
       mappings in upload += uploadMapping(packageBin in Rpm).value,
-      mappings in upload += uploadMapping(packageBin in Debian).value
+      // Debian needs special handling because the value sbt-native-packager
+      // gives us for `packageBin in Debian` (coming from the archiveFilename
+      // method) includes the debian version and arch information,
+      // which we historically have not included.  I don't see a way to
+      // override the filename on disk, so we re-map at upload time
+      mappings in upload += Def.task {
+        (packageBin in Debian).value ->
+          s"scala/${version.value}/${(name in Debian).value}-${version.value}.deb"
+      }.value
     )
 
   def settings: Seq[Setting[_]] =

project/Unix.scala

@@ -93,10 +93,7 @@ object Unix {
 
     linuxPackageMappings in Debian += (packageMapping(
         (sourceDirectory.value / "debian" / "changelog") -> "/usr/share/doc/scala/changelog.gz"
-      ) withUser "root" withGroup "root" withPerms "0644" gzipped) asDocs(),
-
-    // Hack so we use regular version, rather than debian version.
-    target in Debian := target.value / s"${(name in Debian).value}-${version.value}"
+      ) withUser "root" withGroup "root" withPerms "0644" gzipped) asDocs()
 
   )
 }