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optimization enabled, do not publish scaladoc sets)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, 3 insertions, 0 deletions

diff --git a/scripts/common b/scripts/common
index b075469379..35199992bc 100644
--- a/scripts/common
+++ b/scripts/common
@@ -18,6 +18,9 @@ IVY_CACHE="$WORKSPACE/.ivy2"
 mkdir -p $IVY_CACHE
 rm -rf $IVY_CACHE/cache/org.scala-lang
 
+SBT_CMD=${sbtCmd-sbt}
+SBT_CMD="$SBT_CMD -sbt-version 0.13.9"
+
 # temp dir where all 'non-build' operation are performed
 TMP_ROOT_DIR=$(mktemp -d -t pr-scala.XXXX)
 TMP_DIR="${TMP_ROOT_DIR}/tmp"