Use sbt for PR validation builds.

# Improve version handling in the sbt build:

The new settings `baseVersion` and `baseVersionSuffix` make it easier
to set version numbers for different kinds of builds in a consistent
way without e.g. having to first get a git SHA outside of sbt.

The new task `generateBuildCharacterPropertiesFile` writes the file
`buildcharacter.properties` to the root dir. The format is compatible
with the same file produced by the ANT build but it only contains a
subset of the properties, in particular the Maven version, which is
needed in publishing scripts and passed around between different
Jenkins jobs as `jenkins.properties`.

SHAs in version numbers are consistently shortened to 7 digits (as used
by git and github). Previously we used 7 digits in Maven snapshot
version numbers but 10 digits in canonical and OSGi version numbers.

# Add Jenkins script support to the sbt build:

The new command `setupPublishCore` takes the PR validation snapshot
repository as an argument and changes the required settings for the
`publish-core` build (use SHA-SNAPSHOT versioning, compile with
optimization enabled, do not publish scaladoc sets)

For example, the following command can be used to generate
`buildcharacter.properties` with the version numbers needed for PR
validation builds:

  sbt setupPublishCore dummy generateBuildCharacterPropertiesFile

The sbt build will now automatically detect and use a “~/.credentials”
file with the credentials for publishing to a remote repository.

# Call sbt from `publish-core`:

The correct`$SBT_CMD` is set directly in `bootstrap` and used by
`publish-core` to first generate `buildcharacter.properties` and then
build and publish. Parsing the git revision, computing a version
number and getting binary dependencies are no longer required in the
script. This is all done in the sbt build.

1 files changed, 26 insertions, 6 deletions

diff --git a/build.sbt b/build.sbt
index 6f82d78413..6ff93d3b6d 100644
--- a/build.sbt
+++ b/build.sbt
@@ -53,7 +53,7 @@
  *     https://groups.google.com/d/topic/scala-internals/gp5JsM1E0Fo/discussion
  */
 
-import VersionUtil.{versionProps, versionNumber, generatePropertiesFileSettings, versionProperties, versionPropertiesSettings}
+import VersionUtil._
 
 val bootstrapScalaVersion = versionProps("starr.version")
 
@@ -98,13 +98,27 @@ lazy val publishSettings : Seq[Setting[_]] = Seq(
       (f, to)
     }
     IO.copy(mappings)
-  }
+  },
+  credentials ++= {
+    val file = Path.userHome / ".credentials"
+    if (file.exists) List(Credentials(file))
+    else Nil
+  },
+  publishMavenStyle := true
 )
 
-lazy val commonSettings = clearSourceAndResourceDirectories ++ versionPropertiesSettings ++ publishSettings ++ Seq[Setting[_]](
+// Set the version number: The ANT build uses the file "build.number" to get the base version. Overriding versions or
+// suffixes for certain builds is done by directly setting variables from the shell scripts. For example, in
+// publish-core this requires computing the commit SHA first and then passing it to ANT. In the sbt build we use
+// the two settings `baseVersion` and `baseVersionSuffix` to compute all versions (canonical, Maven, OSGi). See
+// VersionUtil.versionPropertiesImpl for details. The standard sbt `version` setting should not be set directly. It
+// is the same as the Maven version and derived automatically from `baseVersion` and `baseVersionSuffix`.
+globalVersionSettings
+baseVersion in Global := "2.11.8"
+baseVersionSuffix in Global := "SNAPSHOT"
+
+lazy val commonSettings = clearSourceAndResourceDirectories ++ publishSettings ++ Seq[Setting[_]](
   organization := "org.scala-lang",
-  // The ANT build uses the file "build.number" and the property "build.release" to compute the version
-  version := "2.11.8-SNAPSHOT",
   scalaVersion := bootstrapScalaVersion,
   // we don't cross build Scala itself
   crossPaths := false,
@@ -649,7 +663,13 @@ lazy val scalaDist = Project("scala-dist", file(".") / "target" / "scala-dist-di
 
 lazy val root = (project in file("."))
   .settings(disableDocs: _*)
-  .settings(publishArtifact := false)
+  .settings(generateBuildCharacterFileSettings: _*)
+  .settings(
+    publishArtifact := false,
+    publish := {},
+    publishLocal := {},
+    commands ++= ScriptCommands.all
+  )
   .aggregate(library, forkjoin, reflect, compiler, interactive, repl, replJline, replJlineEmbedded,
     scaladoc, scalap, actors, partestExtras, junit, libraryAll, scalaDist).settings(
     sources in Compile := Seq.empty,