Fix sbt-launch-lib.bash (#436)

build/sbt-launch-lib.bash

@@ -73,7 +73,12 @@ dlog () {
 
 acquire_sbt_jar () {
   SBT_VERSION=`awk -F "=" '/sbt\.version/ {print $2}' ./project/build.properties`
-  URL1=https://dl.bintray.com/typesafe/ivy-releases/org.scala-sbt/sbt-launch/${SBT_VERSION}/sbt-launch.jar
+  # DEFAULT_ARTIFACT_REPOSITORY env variable can be used to only fetch
+  # artifacts from internal repos only.
+  # Ex:
+  #   DEFAULT_ARTIFACT_REPOSITORY=https://artifacts.internal.com/libs-release/
+  URL1=${DEFAULT_ARTIFACT_REPOSITORY:-https://repo1.maven.org/maven2/}org/scala-sbt/sbt-launch/${SBT_VERSION}/sbt-launch-${SBT_VERSION}.jar
+
   JAR=build/sbt-launch-${SBT_VERSION}.jar
 
   sbt_jar=$JAR
@@ -91,13 +96,13 @@ acquire_sbt_jar () {
       wget --quiet ${URL1} -O "${JAR_DL}" &&\
         mv "${JAR_DL}" "${JAR}"
     else
-      printf "You do not have curl or wget installed, please install sbt manually from http://www.scala-sbt.org/\n"
+      printf "You do not have curl or wget installed, please install sbt manually from https://www.scala-sbt.org/\n"
       exit -1
     fi
     fi
     if [ ! -f "${JAR}" ]; then
     # We failed to download
-    printf "Our attempt to download sbt locally to ${JAR} failed. Please install sbt manually from http://www.scala-sbt.org/\n"
+    printf "Our attempt to download sbt locally to ${JAR} failed. Please install sbt manually from https://www.scala-sbt.org/\n"
     exit -1
     fi
     printf "Launching sbt from ${JAR}\n"