Merge pull request #232 from alexarchambault/remove-dependency-artifact-matching

Get rid of flaky dependency / artifact matching, mark updateSbtClassifiers artifacts as optional

appveyor.yml

@@ -3,8 +3,8 @@ version: '{build}'
 os: Windows Server 2012
 install:
   - cmd: mkdir C:\sbt
-  - cmd: curl -Lo C:\sbt\sbt https://github.com/coursier/sbt-launcher/releases/download/v1.2.17/csbt
+  - cmd: curl -Lo C:\sbt\sbt https://github.com/coursier/sbt-launcher/releases/download/v1.2.20/csbt
-  - cmd: curl -Lo C:\sbt\sbt.bat https://github.com/coursier/sbt-launcher/releases/download/v1.2.17/csbt.bat
+  - cmd: curl -Lo C:\sbt\sbt.bat https://github.com/coursier/sbt-launcher/releases/download/v1.2.20/csbt.bat
   - cmd: SET JAVA_HOME=C:\Program Files\Java\jdk1.8.0
   - cmd: SET PATH=C:\sbt;%JAVA_HOME%\bin;%PATH%
   - cmd: SET JAVA_OPTS=-Xmx4g -Xss2m
@@ -19,7 +19,7 @@ build_script:
   - cmd: .\metadata\coursier fetch io.get-coursier:http-server_2.12:1.0.0
   - ps: Start-Job -filepath .\metadata\scripts\start-it-auth-server.ps1 -ArgumentList $pwd\metadata, $env:TEST_REPOSITORY_HOST, $env:TEST_REPOSITORY_PORT, $env:TEST_REPOSITORY_USER, $env:TEST_REPOSITORY_PASSWORD
 test_script:
-  - sbt ++2.12.7 "sbt-lm-coursier/scripted shared-2/simple" sbt-coursier/scripted
+  - sbt ++2.12.11 "sbt-lm-coursier/scripted shared-2/simple" sbt-coursier/scripted
 branches:
   only:
     - master

build.sbt

@@ -15,7 +15,7 @@ inThisBuild(List(
   )
 ))
 
-val coursierVersion0 = "2.0.0-RC6-15"
+val coursierVersion0 = "2.0.0-RC6-16"
 
 lazy val `lm-coursier` = project
   .in(file("modules/lm-coursier"))

modules/lm-coursier/src/main/scala/lmcoursier/CoursierConfiguration.scala

@@ -52,6 +52,8 @@ import scala.concurrent.duration.Duration
   cachePolicies: Vector[CachePolicy] = CacheDefaults.cachePolicies.to[Vector].map(FromCoursier.cachePolicy),
   @since
   missingOk: Boolean = false,
+  @since
+  sbtClassifiers: Boolean = false
 ) {
 
   def withLog(log: Logger): CoursierConfiguration =

modules/lm-coursier/src/main/scala/lmcoursier/CoursierDependencyResolution.scala

@@ -12,6 +12,8 @@ import lmcoursier.internal.{ArtifactsParams, ArtifactsRun, CoursierModuleDescrip
 import sbt.internal.librarymanagement.IvySbt
 import sbt.librarymanagement._
 import sbt.util.Logger
+import coursier.core.Dependency
+import coursier.core.Publication
 
 class CoursierDependencyResolution(conf: CoursierConfiguration) extends DependencyResolutionInterface {
 
@@ -150,7 +152,7 @@ class CoursierDependencyResolution(conf: CoursierConfiguration) extends Dependen
       parentProjectCache = Map.empty,
       interProjectDependencies = interProjectDependencies,
       internalRepositories = Seq(interProjectRepo, extraProjectsRepo),
-      sbtClassifiers = false,
+      sbtClassifiers = conf.sbtClassifiers,
       projectName = projectName,
       loggerOpt = loggerOpt,
       cache = cache0,
@@ -172,10 +174,11 @@ class CoursierDependencyResolution(conf: CoursierConfiguration) extends Dependen
         includeSignatures = false,
         loggerOpt = loggerOpt,
         projectName = projectName,
-        sbtClassifiers = false,
+        sbtClassifiers = conf.sbtClassifiers,
         cache = cache0,
         parallel = conf.parallelDownloads,
         classpathOrder = conf.classpathOrder,
+        missingOk = conf.missingOk
       )
 
     val sbtBootJarOverrides = SbtBootJars(
@@ -191,12 +194,13 @@ class CoursierDependencyResolution(conf: CoursierConfiguration) extends Dependen
 
     def updateParams(
       resolutions: Map[Set[Configuration], Resolution],
-      artifacts: Map[Artifact, File]
+      artifacts: Seq[(Dependency, Publication, Artifact, Option[File])]
     ) =
       UpdateParams(
         thisModule = (ToCoursier.module(mod), ver),
         shadedConfigOpt = None,
-        artifacts = artifacts,
+        artifacts = artifacts.collect { case (d, p, a, Some(f)) => a -> f }.toMap,
+        fullArtifacts = Some(artifacts.map { case (d, p, a, f) => (d, p, a) -> f }.toMap),
         classifiers = classifiers,
         configs = configs,
         dependencies = dependencies,
@@ -205,12 +209,13 @@ class CoursierDependencyResolution(conf: CoursierConfiguration) extends Dependen
         includeSignatures = false,
         sbtBootJarOverrides = sbtBootJarOverrides,
         classpathOrder = conf.classpathOrder,
+        missingOk = conf.missingOk
       )
 
     val e = for {
       resolutions <- ResolutionRun.resolutions(resolutionParams, verbosityLevel, log)
       artifactsParams0 = artifactsParams(resolutions)
-      artifacts <- ArtifactsRun.artifacts(artifactsParams0, verbosityLevel, log)
+      artifacts <- ArtifactsRun.artifactsResult(artifactsParams0, verbosityLevel, log)
     } yield {
       val updateParams0 = updateParams(resolutions, artifacts)
       UpdateRun.update(updateParams0, verbosityLevel, log)

modules/lm-coursier/src/main/scala/lmcoursier/FromSbt.scala

@@ -102,8 +102,8 @@ object FromSbt {
           }
 
     for {
-      (from, to) <- allMappings
+      (from, to) <- allMappings.distinct
-      pub <- publications
+      pub <- publications.distinct
     } yield {
       val dep0 = dep
         .withConfiguration(to)

modules/lm-coursier/src/main/scala/lmcoursier/internal/ArtifactsParams.scala

@@ -15,4 +15,5 @@ final case class ArtifactsParams(
   cache: FileCache[Task],
   parallel: Int,
   classpathOrder: Boolean,
+  missingOk: Boolean
 )

modules/lm-coursier/src/main/scala/lmcoursier/internal/ArtifactsRun.scala

@@ -7,6 +7,8 @@ import coursier.cache.loggers.{FallbackRefreshDisplay, ProgressBarRefreshDisplay
 import coursier.core.Type
 import coursier.util.Artifact
 import sbt.util.Logger
+import coursier.core.Dependency
+import coursier.core.Publication
 
 // private[coursier]
 object ArtifactsRun {
@@ -16,6 +18,13 @@ object ArtifactsRun {
     verbosityLevel: Int,
     log: Logger
   ): Either[coursier.error.FetchError, Map[Artifact, File]] =
+    artifactsResult(params, verbosityLevel, log).map(_.collect { case (_, _, a, Some(f)) => (a, f) }.toMap)
+
+  def artifactsResult(
+    params: ArtifactsParams,
+    verbosityLevel: Int,
+    log: Logger
+  ): Either[coursier.error.FetchError, Seq[(Dependency, Publication, Artifact, Option[File])]] =
     // let's update only one module at once, for a better output
     // Downloads are already parallel, no need to parallelize further anyway
     Lock.lock.synchronized {
@@ -42,6 +51,15 @@ object ArtifactsRun {
             else
               Nil
           }
+          .addTransformArtifacts { artifacts =>
+            if (params.missingOk)
+              artifacts.map {
+                case (dependency, publication, artifact) =>
+                  (dependency, publication, artifact.withOptional(true))
+              }
+            else
+              artifacts
+          }
           .withCache(
             params
               .cache
@@ -64,8 +82,8 @@ object ArtifactsRun {
                 }
               )
           )
-          .either()
+          .eitherResult()
-          .map(_.toMap)
+          .map(_.fullDetailedArtifacts) // FIXME Misses extraArtifacts, that we don't use for now though
       }
     }
 

modules/lm-coursier/src/main/scala/lmcoursier/internal/ResolutionParams.scala

@@ -62,7 +62,7 @@ final case class ResolutionParams(
         cache = cleanCache
       ),
       cleanCache,
-      sbtClassifiers
+      missingOk
     )
   }
 

modules/lm-coursier/src/main/scala/lmcoursier/internal/SbtUpdateReport.scala

@@ -137,19 +137,43 @@ private[internal] object SbtUpdateReport {
     interProjectDependencies: Seq[Project],
     classifiersOpt: Option[Seq[Classifier]],
     artifactFileOpt: (Module, String, Attributes, Artifact) => Option[File],
+    fullArtifactsOpt: Option[Map[(Dependency, Publication, Artifact), Option[File]]],
     log: Logger,
     keepPomArtifact: Boolean = false,
     includeSignatures: Boolean = false,
     classpathOrder: Boolean,
+    missingOk: Boolean
   ): Vector[ModuleReport] = {
-    val depArtifacts1 = res.dependencyArtifacts(classifiersOpt, classpathOrder)
+
+    val deps = classifiersOpt match {
+      case Some(classifiers) =>
+        res.dependencyArtifacts(Some(classifiers.toSeq), classpathOrder)
+      case None =>
+        res.dependencyArtifacts(None, classpathOrder)
+    }
+
+    val depArtifacts1 = fullArtifactsOpt match {
+      case Some(map) =>
+        deps.map {
+          case (d, p, a) =>
+            val d0 = d.withAttributes(d.attributes.withClassifier(p.classifier))
+            val a0 = if (missingOk) a.withOptional(true) else a
+            val f = map.get((d0, p, a0)).flatten
+            (d, p, a0, f) // not d0
+        }
+      case None =>
+        deps.map {
+          case (d, p, a) =>
+            (d, p, a, None)
+        }
+    }
 
     val depArtifacts0 =
       if (keepPomArtifact)
         depArtifacts1
       else
         depArtifacts1.filter {
-          case (_, pub, _) => pub.attributes != Attributes(Type.pom, Classifier.empty)
+          case (_, pub, _, _) => pub.attributes != Attributes(Type.pom, Classifier.empty)
         }
 
     val depArtifacts =
@@ -159,16 +183,16 @@ private[internal] object SbtUpdateReport {
 
         if (notFound.isEmpty)
           depArtifacts0.flatMap {
-            case (dep, pub, a) =>
+            case (dep, pub, a, f) =>
               val sigPub = pub
                 // not too sure about those
                 .withExt(Extension(pub.ext.value))
                 .withType(Type(pub.`type`.value))
-              Seq((dep, pub, a)) ++
+              Seq((dep, pub, a, f)) ++
-                a.extra.get("sig").toSeq.map((dep, sigPub, _))
+                a.extra.get("sig").toSeq.map((dep, sigPub, _, None))
           }
         else {
-          for ((_, _, a) <- notFound)
+          for ((_, _, a, _) <- notFound)
             log.error(s"No signature found for ${a.url}")
           sys.error(s"${notFound.length} signature(s) not found")
         }
@@ -178,7 +202,7 @@ private[internal] object SbtUpdateReport {
     val groupedDepArtifacts = {
       val m = depArtifacts.groupBy(_._1)
       val fromLib = depArtifacts.map(_._1).distinct.map { dep =>
-        dep -> m.getOrElse(dep, Nil).map { case (_, pub, a) => (pub, a) }
+        dep -> m.getOrElse(dep, Nil).map { case (_, pub, a, f) => (pub, a, f) }
       }
       val fromInterProj = interProjectDependencies
         .filter(p => p.module != thisModule._1)
@@ -249,11 +273,19 @@ private[internal] object SbtUpdateReport {
                 Vector.empty
             }
           }
+        val filesOpt = artifacts.map {
+          case (pub, a, fileOpt) =>
+            val fileOpt0 = fileOpt.orElse {
+              if (fullArtifactsOpt.isEmpty) artifactFileOpt(proj.module, proj.version, pub.attributes, a)
+              else None
+            }
+            (pub, a, fileOpt0)
+        }
         moduleReport((
           dep,
           dependees,
           proj,
-          artifacts.map { case (pub, a) => (pub, a, artifactFileOpt(proj.module, proj.version, pub.attributes, a)) }
+          filesOpt
         ))
     }
   }
@@ -266,10 +298,12 @@ private[internal] object SbtUpdateReport {
     configs: Map[Configuration, Set[Configuration]],
     classifiersOpt: Option[Seq[Classifier]],
     artifactFileOpt: (Module, String, Attributes, Artifact) => Option[File],
+    fullArtifactsOpt: Option[Map[(Dependency, Publication, Artifact), Option[File]]],
     log: Logger,
     keepPomArtifact: Boolean = false,
     includeSignatures: Boolean = false,
     classpathOrder: Boolean,
+    missingOk: Boolean
   ): UpdateReport = {
 
     val configReports = configs.map {
@@ -288,10 +322,12 @@ private[internal] object SbtUpdateReport {
           interProjectDependencies,
           classifiersOpt,
           artifactFileOpt,
+          fullArtifactsOpt,
           log,
           keepPomArtifact = keepPomArtifact,
           includeSignatures = includeSignatures,
           classpathOrder = classpathOrder,
+          missingOk = missingOk
         )
 
         val reports0 = subRes.rootDependencies match {

modules/lm-coursier/src/main/scala/lmcoursier/internal/UpdateParams.scala

@@ -10,6 +10,7 @@ final case class UpdateParams(
   thisModule: (Module, String),
   shadedConfigOpt: Option[(String, Configuration)],
   artifacts: Map[Artifact, File],
+  fullArtifacts: Option[Map[(Dependency, Publication, Artifact), Option[File]]],
   classifiers: Option[Seq[Classifier]],
   configs: Map[Configuration, Set[Configuration]],
   dependencies: Seq[(Configuration, Dependency)],
@@ -18,6 +19,7 @@ final case class UpdateParams(
   includeSignatures: Boolean,
   sbtBootJarOverrides: Map[(Module, String), File],
   classpathOrder: Boolean,
+  missingOk: Boolean
 ) {
 
   def artifactFileOpt(
@@ -37,7 +39,11 @@ final case class UpdateParams(
       else
         None
 
-    fromBootJars.orElse(artifacts.get(artifact))
+    val artifact0 =
+      if (missingOk) artifact.withOptional(true)
+      else artifact
+
+    fromBootJars.orElse(artifacts.get(artifact0))
   }
 
 }

modules/lm-coursier/src/main/scala/lmcoursier/internal/UpdateRun.scala

@@ -92,9 +92,11 @@ object UpdateRun {
       params.configs,
       params.classifiers,
       params.artifactFileOpt,
+      params.fullArtifacts,
       log,
       includeSignatures = params.includeSignatures,
       classpathOrder = params.classpathOrder,
+      missingOk = params.missingOk
     )
   }
 

modules/sbt-coursier/src/main/scala/coursier/sbtcoursier/ArtifactsTasks.scala

@@ -72,6 +72,7 @@ object ArtifactsTasks {
           .withFollowHttpToHttpsRedirections(true),
         parallel = parallelDownloads,
         classpathOrder = true,
+        missingOk = sbtClassifiers
       )
 
       val resOrError = ArtifactsRun.artifacts(

modules/sbt-coursier/src/main/scala/coursier/sbtcoursier/UpdateTasks.scala

@@ -130,6 +130,7 @@ object UpdateTasks {
               (p.module, p.version),
               shadedConfigOpt,
               artifactFilesOrErrors0,
+              None,
               classifiers,
               configs,
               dependencies,
@@ -138,6 +139,7 @@ object UpdateTasks {
               includeSignatures,
               sbtBootJarOverrides,
               classpathOrder = true,
+              missingOk = sbtClassifiers
             )
 
             val rep = UpdateRun.update(params, verbosityLevel, log)

modules/sbt-coursier/src/sbt-test/shared-2/update-sbt-classifiers-2/build.sbt

@@ -0,0 +1,50 @@
+
+scalaVersion := appConfiguration.value.provider.scalaProvider.version
+
+lazy val updateSbtClassifiersCheck = TaskKey[Unit]("updateSbtClassifiersCheck")
+
+updateSbtClassifiersCheck := {
+
+  val defaultModules = updateSbtClassifiers
+    .value
+    .configuration(Default)
+    .map(_.modules)
+    .getOrElse(Nil)
+
+  val compileModules = updateSbtClassifiers
+    .value
+    .configuration(Compile)
+    .map(_.modules)
+    .getOrElse(Nil)
+
+  def artifacts(org: String, name: String) =
+    (defaultModules ++ compileModules)
+      .map { m =>
+        println(s"Found module $m")
+        m
+      }
+      .collect {
+        case moduleReport
+          if moduleReport.module.organization == org &&
+               moduleReport.module.name == name =>
+          moduleReport.artifacts
+      }
+      .toSeq
+      .flatten
+
+  def ensureHasArtifact(orgName: (String, String)*) =
+    assert(
+      orgName.exists {
+        case (org, name) =>
+          artifacts(org, name).exists(_._2.getName.endsWith("-sources.jar"))
+      },
+      s"Any of $orgName not found"
+    )
+
+  ensureHasArtifact("org.scala-lang" -> "scala-library")
+  ensureHasArtifact("org.scala-lang.modules" -> s"scala-xml_${scalaBinaryVersion.value}")
+  ensureHasArtifact(
+    "io.get-coursier" -> s"lm-coursier_${scalaBinaryVersion.value}",
+    "io.get-coursier" -> s"lm-coursier-shaded_${scalaBinaryVersion.value}"
+  )
+}

modules/sbt-coursier/src/sbt-test/shared-2/update-sbt-classifiers-2/project/plugins.sbt

@@ -0,0 +1,15 @@
+addSbtPlugin {
+
+  val name = sys.props.getOrElse(
+    "plugin.name",
+    sys.error("plugin.name Java property not set")
+  )
+  val version = sys.props.getOrElse(
+    "plugin.version",
+    sys.error("plugin.version Java property not set")
+  )
+
+  "io.get-coursier" % name % version
+}
+
+addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.8.0")

modules/sbt-coursier/src/sbt-test/shared-2/update-sbt-classifiers-2/test

@@ -0,0 +1 @@
+> updateSbtClassifiersCheck

modules/sbt-lm-coursier/src/main/scala/coursier/sbtlmcoursier/LmCoursierPlugin.scala

@@ -11,6 +11,7 @@ import sbt.Keys.{appConfiguration, autoScalaLibrary, classpathTypes, dependencyO
 import sbt.librarymanagement.DependencyResolution
 
 import scala.language.reflectiveCalls
+import sbt.TaskKey
 
 object LmCoursierPlugin extends AutoPlugin {
 
@@ -38,6 +39,19 @@ object LmCoursierPlugin extends AutoPlugin {
   // so that it doesn't override us :|
   override def requires = SbtCoursierShared
 
+  private lazy val scalaCompilerBridgeScopeOpt: Option[TaskKey[Unit]] =
+    try {
+      // only added in sbt 1.3.x
+      val key = sbt.Keys
+        .asInstanceOf[{ def scalaCompilerBridgeScope: TaskKey[Unit] }]
+        .scalaCompilerBridgeScope
+      Some(key)
+    }
+    catch {
+      case _: NoSuchMethodError | _: NoSuchMethodException =>
+        None
+    }
+
   // putting this in projectSettings like sbt.plugins.IvyPlugin does :|
   override def projectSettings: Seq[Setting[_]] =
     Seq(
@@ -59,7 +73,18 @@ object LmCoursierPlugin extends AutoPlugin {
         dependencyResolution := mkDependencyResolution.value,
         coursierConfiguration := mkCoursierConfiguration(sbtClassifiers = true).value
       )
+    ) ++ {
+      scalaCompilerBridgeScopeOpt match {
+        case None => Nil
+        case Some(scalaCompilerBridgeScopeKey) =>
+          inTask(scalaCompilerBridgeScopeKey)(
+            Seq(
+              dependencyResolution := mkDependencyResolution.value,
+              coursierConfiguration := mkCoursierConfiguration().value
             )
+          )
+      }
+    }
 
 
   private def mkCoursierConfiguration(withClassifiers: Boolean = false, sbtClassifiers: Boolean = false): Def.Initialize[Task[CoursierConfiguration]] =
@@ -160,7 +185,9 @@ object LmCoursierPlugin extends AutoPlugin {
           .withIvyHome(ivyPaths.value.ivyHome)
           .withStrict(strict)
           .withForceVersions(userForceVersions.toVector)
-          .withMissingOk(updateConfig.missingOk)
+          // seems missingOk is false in the updateConfig of updateSbtClassifiers?
+          .withMissingOk(updateConfig.missingOk || sbtClassifiers)
+          .withSbtClassifiers(sbtClassifiers)
       }
     }
   private def mkDependencyResolution: Def.Initialize[Task[DependencyResolution]] =

sbt

@@ -6,11 +6,11 @@
 
 set -o pipefail
 
-declare -r sbt_release_version="1.2.8"
+declare -r sbt_release_version="1.3.10"
-declare -r sbt_unreleased_version="1.3.0-RC1"
+declare -r sbt_unreleased_version="1.3.10"
 
-declare -r latest_213="2.13.0"
+declare -r latest_213="2.13.2"
-declare -r latest_212="2.12.8"
+declare -r latest_212="2.12.11"
 declare -r latest_211="2.11.12"
 declare -r latest_210="2.10.7"
 declare -r latest_29="2.9.3"
@@ -18,21 +18,20 @@ declare -r latest_28="2.8.2"
 
 declare -r buildProps="project/build.properties"
 
-declare -r sbt_launch_ivy_release_repo="http://repo.typesafe.com/typesafe/ivy-releases"
+declare -r sbt_launch_ivy_release_repo="https://repo.typesafe.com/typesafe/ivy-releases"
 declare -r sbt_launch_ivy_snapshot_repo="https://repo.scala-sbt.org/scalasbt/ivy-snapshots"
-declare -r sbt_launch_mvn_release_repo="http://repo.scala-sbt.org/scalasbt/maven-releases"
+declare -r sbt_launch_mvn_release_repo="https://repo.scala-sbt.org/scalasbt/maven-releases"
-declare -r sbt_launch_mvn_snapshot_repo="http://repo.scala-sbt.org/scalasbt/maven-snapshots"
+declare -r sbt_launch_mvn_snapshot_repo="https://repo.scala-sbt.org/scalasbt/maven-snapshots"
 
-declare -r default_jvm_opts_common="-Xms512m -Xss2m"
+declare -r default_jvm_opts_common="-Xms512m -Xss2m -XX:MaxInlineLevel=18"
-declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy"
+declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy -Dsbt.coursier.home=project/.coursier"
 
-declare -r default_coursier_launcher_version="1.2.17"
+declare -r default_coursier_launcher_version="1.2.20"
 declare coursier_launcher_version="default"
 
 declare sbt_jar sbt_dir sbt_create sbt_version sbt_script sbt_new
 declare sbt_explicit_version
 declare verbose noshare batch trace_level
-declare debugUs
 
 declare java_cmd="java"
 declare sbt_launch_dir="$HOME/.sbt/launchers"
@@ -44,11 +43,14 @@ declare -a java_args coursier_args scalac_args sbt_commands residual_args
 # args to jvm/sbt via files or environment variables
 declare -a extra_jvm_opts extra_sbt_opts
 
-echoerr () { echo >&2 "$@"; }
+echoerr() { echo >&2 "$@"; }
-vlog ()    { [[ -n "$verbose" ]] && echoerr "$@"; }
+vlog()    { [[ -n "$verbose" ]] && echoerr "$@"; }
-die ()     { echo "Aborting: $*" ; exit 1; }
+die()     {
+  echo "Aborting: $*"
+  exit 1
+}
 
-setTrapExit () {
+setTrapExit() {
   # save stty and trap exit, to ensure echo is re-enabled if we are interrupted.
   SBT_STTY="$(stty -g 2>/dev/null)"
   export SBT_STTY
@@ -67,9 +69,12 @@ setTrapExit () {
 
 # this seems to cover the bases on OSX, and someone will
 # have to tell me about the others.
-get_script_path () {
+get_script_path() {
   local path="$1"
-  [[ -L "$path" ]] || { echo "$path" ; return; }
+  [[ -L "$path" ]] || {
+    echo "$path"
+    return
+  }
 
   local -r target="$(readlink "$path")"
   if [[ "${target:0:1}" == "/" ]]; then
@@ -84,7 +89,7 @@ declare -r script_path
 script_name="${script_path##*/}"
 declare -r script_name
 
-init_default_option_file () {
+init_default_option_file() {
   local overriding_var="${!1}"
   local default_file="$2"
   if [[ ! -r "$default_file" && "$overriding_var" =~ ^@(.*)$ ]]; then
@@ -99,44 +104,44 @@ init_default_option_file () {
 sbt_opts_file="$(init_default_option_file SBT_OPTS .sbtopts)"
 jvm_opts_file="$(init_default_option_file JVM_OPTS .jvmopts)"
 
-build_props_sbt () {
+build_props_sbt() {
-  [[ -r "$buildProps" ]] && \
+  [[ -r "$buildProps" ]] &&
     grep '^sbt\.version' "$buildProps" | tr '=\r' ' ' | awk '{ print $2; }'
 }
 
-set_sbt_version () {
+set_sbt_version() {
   sbt_version="${sbt_explicit_version:-$(build_props_sbt)}"
   [[ -n "$sbt_version" ]] || sbt_version=$sbt_release_version
   export sbt_version
 }
 
-url_base () {
+url_base() {
   local version="$1"
 
   case "$version" in
-        0.7.*) echo "http://simple-build-tool.googlecode.com" ;;
+    0.7.*)     echo "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/simple-build-tool" ;;
-      0.10.* ) echo "$sbt_launch_ivy_release_repo" ;;
+    0.10.*)    echo "$sbt_launch_ivy_release_repo" ;;
     0.11.[12]) echo "$sbt_launch_ivy_release_repo" ;;
     0.*-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]) # ie "*-yyyymmdd-hhMMss"
       echo          "$sbt_launch_ivy_snapshot_repo" ;;
     0.*)       echo "$sbt_launch_ivy_release_repo" ;;
-    *-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]) # ie "*-yyyymmdd-hhMMss"
+    *-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]T[0-9][0-9][0-9][0-9][0-9][0-9]) # ie "*-yyyymmddThhMMss"
       echo          "$sbt_launch_mvn_snapshot_repo" ;;
     *)         echo "$sbt_launch_mvn_release_repo" ;;
   esac
 }
 
-make_url () {
+make_url() {
   local version="$1"
 
   local base="${sbt_launch_repo:-$(url_base "$version")}"
 
   case "$version" in
-        0.7.*) echo "$base/files/sbt-launch-0.7.7.jar" ;;
+    0.7.*)     echo "$base/sbt-launch-0.7.7.jar" ;;
-      0.10.* ) echo "$base/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
+    0.10.*)    echo "$base/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
     0.11.[12]) echo "$base/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
     0.*)       echo "$base/org.scala-sbt/sbt-launch/$version/sbt-launch.jar" ;;
-            *) echo "$base/org/scala-sbt/sbt-launch/$version/sbt-launch.jar" ;;
+    *)         echo "$base/org/scala-sbt/sbt-launch/$version/sbt-launch-${version}.jar" ;;
   esac
 }
 
@@ -152,24 +157,37 @@ enable_coursier () {
   fi
 }
 
-addJava ()     { vlog "[addJava] arg = '$1'"    ;     java_args+=("$1"); }
+addJava()      {
-addCoursier () { vlog "[addCoursier] arg = '$1'"; coursier_args+=("$1"); }
+  vlog "[addJava] arg = '$1'"
-addSbt ()      { vlog "[addSbt] arg = '$1'"     ;  sbt_commands+=("$1"); }
+  java_args+=("$1")
-addScalac ()   { vlog "[addScalac] arg = '$1'"  ;   scalac_args+=("$1"); }
+}
-addResidual () { vlog "[residual] arg = '$1'"   ; residual_args+=("$1"); }
+addSbt()       {
+  vlog "[addSbt] arg = '$1'"
+  sbt_commands+=("$1")
+}
+addScalac()    {
+  vlog "[addScalac] arg = '$1'"
+  scalac_args+=("$1")
+}
+addResidual()  {
+  vlog "[residual] arg = '$1'"
+  residual_args+=("$1")
+}
 
-addResolver () { addSbt "set resolvers += $1"; }
+addResolver() { addSbt "set resolvers += $1"; }
-addDebugger () { addJava "-Xdebug" ; addJava "-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$1"; }
+
-setThisBuild () {
+addDebugger() { addJava "-Xdebug" && addJava "-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$1"; }
+
+setThisBuild() {
   vlog "[addBuild] args = '$*'"
   local key="$1" && shift
   addSbt "set $key in ThisBuild := $*"
 }
-setScalaVersion () {
+setScalaVersion() {
   [[ "$1" == *"-SNAPSHOT" ]] && addResolver 'Resolver.sonatypeRepo("snapshots")'
   addSbt "++ $1"
 }
-setJavaHome () {
+setJavaHome() {
   java_cmd="$1/bin/java"
   setThisBuild javaHome "_root_.scala.Some(file(\"$1\"))"
   export JAVA_HOME="$1"
@@ -182,9 +200,9 @@ getJavaVersion() {
 
   # java -version on java8 says 1.8.x
   # but on 9 and 10 it's 9.x.y and 10.x.y.
-  if [[ "$str" =~ ^1\.([0-9]+)\..*$ ]]; then
+  if [[ "$str" =~ ^1\.([0-9]+)(\..*)?$ ]]; then
     echo "${BASH_REMATCH[1]}"
-  elif [[ "$str" =~ ^([0-9]+)\..*$ ]]; then
+  elif [[ "$str" =~ ^([0-9]+)(\..*)?$ ]]; then
     echo "${BASH_REMATCH[1]}"
   elif [[ -n "$str" ]]; then
     echoerr "Can't parse java version from: $str"
@@ -209,31 +227,25 @@ checkJava() {
   fi
 }
 
-java_version () {
+java_version() {
   local -r version=$(getJavaVersion "$java_cmd")
   vlog "Detected Java version: $version"
   echo "$version"
 }
 
 # MaxPermSize critical on pre-8 JVMs but incurs noisy warning on 8+
-default_jvm_opts () {
+default_jvm_opts() {
   local -r v="$(java_version)"
-  if [[ $v -ge 8 ]]; then
+  if [[ $v -ge 10 ]]; then
+    echo "$default_jvm_opts_common -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler"
+  elif [[ $v -ge 8 ]]; then
     echo "$default_jvm_opts_common"
   else
     echo "-XX:MaxPermSize=384m $default_jvm_opts_common"
   fi
 }
 
-build_props_scala () {
+execRunner() {
-  if [[ -r "$buildProps" ]]; then
-    versionLine="$(grep '^build.scala.versions' "$buildProps")"
-    versionString="${versionLine##build.scala.versions=}"
-    echo "${versionString%% .*}"
-  fi
-}
-
-execRunner () {
   # print the arguments one to a line, quoting any containing spaces
   vlog "# Executing command line:" && {
     for arg; do
@@ -251,23 +263,23 @@ execRunner () {
   setTrapExit
 
   if [[ -n "$batch" ]]; then
-    "$@" < /dev/null
+    "$@" </dev/null
   else
     "$@"
   fi
 }
 
-jar_url ()  { make_url "$1"; }
+jar_url() { make_url "$1"; }
 
-is_cygwin () { [[ "$(uname -a)" == "CYGWIN"* ]]; }
+is_cygwin() { [[ "$(uname -a)" == "CYGWIN"* ]]; }
 
-jar_file () {
+jar_file() {
-  is_cygwin \
+  is_cygwin &&
-  && cygpath -w "$sbt_launch_dir/$1/sbt-launch.jar" \
+    cygpath -w "$sbt_launch_dir/$1/sbt-launch.jar" ||
-  || echo "$sbt_launch_dir/$1/sbt-launch.jar"
+    echo "$sbt_launch_dir/$1/sbt-launch.jar"
 }
 
-download_url () {
+download_url() {
   local url="$1"
   local jar="$2"
   local message="$3"
@@ -277,15 +289,15 @@ download_url () {
   echoerr "    To  $jar"
 
   mkdir -p "${jar%/*}" && {
-    if command -v curl > /dev/null 2>&1; then
+    if command -v curl >/dev/null 2>&1; then
       curl --fail --silent --location "$url" --output "$jar"
-    elif command -v wget > /dev/null 2>&1; then
+    elif command -v wget >/dev/null 2>&1; then
       wget -q -O "$jar" "$url"
     fi
   } && [[ -r "$jar" ]]
 }
 
-acquire_sbt_jar () {
+acquire_sbt_jar() {
 
   # if none of the options touched coursier_launcher_version, use the coursier
   # launcher with sbt >= 0.13.8
@@ -310,17 +322,68 @@ acquire_sbt_jar () {
   } || {
     if [[ -z "$coursier_launcher_version" ]]; then
       sbt_jar="$(jar_file "$sbt_version")"
-      download_url "$(make_url "$sbt_version")" "$sbt_jar" \
+      jar_url="$(make_url "$sbt_version")"
-        "Downloading sbt launcher for $sbt_version:"
+
+      download_url "${jar_url}" "${sbt_jar}" \
+        "Downloading sbt launcher for ${sbt_version}:"
+
+      case "${sbt_version}" in
+        0.*)
+          vlog "SBT versions < 1.0 do not have published MD5 checksums, skipping check"
+          echo ""
+          ;;
+        *)   verify_sbt_jar "${sbt_jar}" ;;
+      esac
     else
       sbt_jar="$(jar_file "coursier_$coursier_launcher_version")"
       download_url "$(make_coursier_url "$coursier_launcher_version")" "$sbt_jar" \
-        "Downloading coursier sbt launcher $coursier_launcher_version:"
+        "Downloading coursier sbt launcher ${coursier_launcher_version}:"
     fi
   }
 }
 
-usage () {
+verify_sbt_jar() {
+  local jar="${1}"
+  local md5="${jar}.md5"
+  md5url="$(make_url "${sbt_version}").md5"
+
+  echoerr "Downloading sbt launcher ${sbt_version} md5 hash:"
+  echoerr "  From  ${md5url}"
+  echoerr "    To  ${md5}"
+
+  download_url "${md5url}" "${md5}" >/dev/null 2>&1
+
+  if command -v md5sum >/dev/null 2>&1; then
+    if echo "$(cat "${md5}")  ${jar}" | md5sum -c -; then
+      rm -rf "${md5}"
+      return 0
+    else
+      echoerr "Checksum does not match"
+      return 1
+    fi
+  elif command -v md5 >/dev/null 2>&1; then
+    if [ "$(md5 -q "${jar}")" == "$(cat "${md5}")" ]; then
+      rm -rf "${md5}"
+      return 0
+    else
+      echoerr "Checksum does not match"
+      return 1
+    fi
+  elif command -v openssl >/dev/null 2>&1; then
+    if [ "$(openssl md5 -r "${jar}" | awk '{print $1}')" == "$(cat "${md5}")" ]; then
+      rm -rf "${md5}"
+      return 0
+    else
+      echoerr "Checksum does not match"
+      return 1
+    fi
+  else
+    echoerr "Could not find an MD5 command"
+    return 1
+  fi
+}
+
+usage() {
   set_sbt_version
   cat <<EOM
 Usage: $script_name [options]
@@ -330,12 +393,6 @@ options to this runner use a single dash. Any sbt command can be scheduled
 to run first by prefixing the command with --, so --warn, --error and so on
 are not special.
 
-Output filtering: if there is a file in the home directory called .sbtignore
-and this is not an interactive sbt session, the file is treated as a list of
-bash regular expressions. Output lines which match any regex are not echoed.
-One can see exactly which lines would have been suppressed by starting this
-runner with the -x option.
-
   -h | -help         print this message
   -v                 verbose operation (this runner is chattier)
   -d, -w, -q         aliases for --debug, --warn, --error (q means quiet)
@@ -357,8 +414,8 @@ runner with the -x option.
   -mainline          use the mainline sbt launcher
 
   # sbt version (default: sbt.version from $buildProps if present, otherwise $sbt_release_version)
-  -sbt-force-latest         force the use of the latest release of sbt: $sbt_release_version
   -sbt-version <version>  use the specified version of sbt (default: $sbt_release_version)
+  -sbt-force-latest       force the use of the latest release of sbt: $sbt_release_version
   -sbt-dev                use the latest pre-release version of sbt: $sbt_unreleased_version
   -sbt-jar      <path>    use the specified jar as the sbt launcher
   -sbt-launch-dir <path>  directory to hold sbt launchers (default: $sbt_launch_dir)
@@ -395,10 +452,11 @@ runner with the -x option.
   -sbt-opts <path>  file containing sbt args (if not given, .sbtopts in project root is used if present)
   -S-X              add -X to sbt's scalacOptions (-S is stripped)
 EOM
+  exit 0
 }
 
-process_args () {
+process_args() {
-  require_arg () {
+  require_arg() {
     local type="$1"
     local opt="$2"
     local arg="$3"
@@ -409,35 +467,45 @@ process_args () {
   }
   while [[ $# -gt 0 ]]; do
     case "$1" in
-          -h|-help) usage; exit 0 ;;
+      -h |   -help) usage ;;
       -v)           verbose=true && shift ;;
       -d)           addSbt "--debug" && shift ;;
       -w)           addSbt "--warn"  && shift ;;
       -q)           addSbt "--error" && shift ;;
-                -x) debugUs=true && shift ;;
+      -x)           shift ;; # currently unused
       -trace)       require_arg integer "$1" "$2" && trace_level="$2" && shift 2 ;;
-              -ivy) require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
-        -no-colors) addJava "-Dsbt.log.noformat=true" && shift ;;
-         -no-share) noshare=true && shift ;;
-         -sbt-boot) require_arg path "$1" "$2" && addJava "-Dsbt.boot.directory=$2" && shift 2 ;;
-          -sbt-dir) require_arg path "$1" "$2" && sbt_dir="$2" && shift 2 ;;
       -debug-inc)   addJava "-Dxsbt.inc.debug=true" && shift ;;
+
+      -no-colors)   addJava "-Dsbt.log.noformat=true" && shift ;;
+      -sbt-create)  sbt_create=true && shift ;;
+      -sbt-dir)     require_arg path "$1" "$2" && sbt_dir="$2" && shift 2 ;;
+      -sbt-boot)    require_arg path "$1" "$2" && addJava "-Dsbt.boot.directory=$2" && shift 2 ;;
+      -ivy)         require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
+      -no-share)    noshare=true && shift ;;
       -offline)     addSbt "set offline in Global := true" && shift ;;
       -jvm-debug)   require_arg port "$1" "$2" && addDebugger "$2" && shift 2 ;;
       -batch)       batch=true && shift ;;
       -prompt)      require_arg "expr" "$1" "$2" && setThisBuild shellPrompt "(s => { val e = Project.extract(s) ; $2 })" && shift 2 ;;
       -script)      require_arg file "$1" "$2" && sbt_script="$2" && addJava "-Dsbt.main.class=sbt.ScriptMain" && shift 2 ;;
 
-       -sbt-create) sbt_create=true && shift ;;
-          -sbt-jar) require_arg path "$1" "$2" && sbt_jar="$2" && shift 2 ;;
       -sbt-version) require_arg version "$1" "$2" && sbt_explicit_version="$2" && shift 2 ;;
       -sbt-force-latest) sbt_explicit_version="$sbt_release_version" && shift ;;
       -sbt-dev)     sbt_explicit_version="$sbt_unreleased_version" && shift ;;
+      -sbt-jar)     require_arg path "$1" "$2" && sbt_jar="$2" && shift 2 ;;
       -sbt-launch-dir) require_arg path "$1" "$2" && sbt_launch_dir="$2" && shift 2 ;;
       -sbt-launch-repo) require_arg path "$1" "$2" && sbt_launch_repo="$2" && shift 2 ;;
+
+      -28)          setScalaVersion "$latest_28"  && shift ;;
+      -29)          setScalaVersion "$latest_29"  && shift ;;
+      -210)         setScalaVersion "$latest_210" && shift ;;
+      -211)         setScalaVersion "$latest_211" && shift ;;
+      -212)         setScalaVersion "$latest_212" && shift ;;
+      -213)         setScalaVersion "$latest_213" && shift ;;
+
       -coursier)         enable_coursier && shift ;;
       -mainline)         coursier_launcher_version="" && shift ;;
       -coursier-version) require_arg version "$1" "$2" && coursier_launcher_version="$2" && shift 2 ;;
+
       -scala-version) require_arg version "$1" "$2" && setScalaVersion "$2" && shift 2 ;;
       -binary-version) require_arg version "$1" "$2" && setThisBuild scalaBinaryVersion "\"$2\"" && shift 2 ;;
       -scala-home)  require_arg path "$1" "$2" && setThisBuild scalaHome "_root_.scala.Some(file(\"$2\"))" && shift 2 ;;
@@ -449,13 +517,9 @@ process_args () {
       -J*)          addJava "${1:2}" && shift ;;
       -S*)          addScalac "${1:2}" && shift ;;
       -C*)          addCoursier "${1:2}" && shift ;;
-               -28) setScalaVersion "$latest_28" && shift ;;
+
-               -29) setScalaVersion "$latest_29" && shift ;;
-              -210) setScalaVersion "$latest_210" && shift ;;
-              -211) setScalaVersion "$latest_211" && shift ;;
-              -212) setScalaVersion "$latest_212" && shift ;;
-              -213) setScalaVersion "$latest_213" && shift ;;
       new)          sbt_new=true && : ${sbt_explicit_version:=$sbt_release_version} && addResidual "$1" && shift ;;
+
       *)            addResidual "$1" && shift ;;
     esac
   done
@@ -470,7 +534,7 @@ readConfigFile() {
   until $end; do
     read -r || end=true
     [[ $REPLY =~ ^# ]] || [[ -z $REPLY ]] || echo "$REPLY"
-  done < "$1"
+  done <"$1"
 }
 
 # if there are file/environment sbt_opts, process again so we
@@ -480,7 +544,7 @@ if [[ -r "$sbt_opts_file" ]]; then
   while read -r opt; do extra_sbt_opts+=("$opt"); done < <(readConfigFile "$sbt_opts_file")
 elif [[ -n "$SBT_OPTS" && ! ("$SBT_OPTS" =~ ^@.*) ]]; then
   vlog "Using sbt options defined in variable \$SBT_OPTS"
-  IFS=" " read -r -a extra_sbt_opts <<< "$SBT_OPTS"
+  IFS=" " read -r -a extra_sbt_opts <<<"$SBT_OPTS"
 else
   vlog "No extra sbt options have been defined"
 fi
@@ -499,7 +563,7 @@ checkJava
 # only exists in 0.12+
 setTraceLevel() {
   case "$sbt_version" in
-    "0.7."* | "0.10."* | "0.11."* ) echoerr "Cannot set trace level in sbt version $sbt_version" ;;
+    "0.7."* | "0.10."* | "0.11."*) echoerr "Cannot set trace level in sbt version $sbt_version" ;;
     *)                             setThisBuild traceLevel "$trace_level" ;;
   esac
 }
@@ -511,12 +575,12 @@ setTraceLevel() {
 vlog "Detected sbt version $sbt_version"
 
 if [[ -n "$sbt_script" ]]; then
-  residual_args=( "$sbt_script" "${residual_args[@]}" )
+  residual_args=("$sbt_script" "${residual_args[@]}")
 else
   # no args - alert them there's stuff in here
-  (( argumentCount > 0 )) || {
+  ((argumentCount > 0)) || {
     vlog "Starting $script_name: invoke with -help for other options"
-    residual_args=( shell )
+    residual_args=(shell)
   }
 fi
 
@@ -542,7 +606,7 @@ EOM
 # no jar? download it.
 [[ -r "$sbt_jar" ]] || acquire_sbt_jar || {
   # still no jar? uh-oh.
-  echo "Download failed. Obtain the jar manually and place it at $sbt_jar"
+  echo "Could not download and verify the launcher. Obtain the jar manually and place it at $sbt_jar"
   exit 1
 }
 
@@ -552,7 +616,7 @@ if [[ -n "$noshare" ]]; then
   done
 else
   case "$sbt_version" in
-    "0.7."* | "0.10."* | "0.11."* | "0.12."* )
+    "0.7."* | "0.10."* | "0.11."* | "0.12."*)
       [[ -n "$sbt_dir" ]] || {
         sbt_dir="$HOME/.sbt/$sbt_version"
         vlog "Using $sbt_dir as sbt dir, -sbt-dir to override."
@@ -570,10 +634,10 @@ if [[ -r "$jvm_opts_file" ]]; then
   while read -r opt; do extra_jvm_opts+=("$opt"); done < <(readConfigFile "$jvm_opts_file")
 elif [[ -n "$JVM_OPTS" && ! ("$JVM_OPTS" =~ ^@.*) ]]; then
   vlog "Using jvm options defined in \$JVM_OPTS variable"
-  IFS=" " read -r -a extra_jvm_opts <<< "$JVM_OPTS"
+  IFS=" " read -r -a extra_jvm_opts <<<"$JVM_OPTS"
 else
   vlog "Using default jvm options"
-  IFS=" " read -r -a extra_jvm_opts <<< "$(default_jvm_opts)"
+  IFS=" " read -r -a extra_jvm_opts <<<"$( default_jvm_opts)"
 fi
 
 # traceLevel is 0.12+
@@ -586,46 +650,10 @@ fi
   addCoursier "--"
 }
 
-main () {
+execRunner "$java_cmd" \
-  execRunner "$java_cmd" \
   "${extra_jvm_opts[@]}" \
   "${java_args[@]}" \
   -jar "$sbt_jar" \
   "${coursier_args[@]}" \
   "${sbt_commands[@]}" \
   "${residual_args[@]}"
-}
-
-# sbt inserts this string on certain lines when formatting is enabled:
-#   val OverwriteLine = "\r\u001BM\u001B[2K"
-# ...in order not to spam the console with a million "Resolving" lines.
-# Unfortunately that makes it that much harder to work with when
-# we're not going to print those lines anyway. We strip that bit of
-# line noise, but leave the other codes to preserve color.
-mainFiltered () {
-  local -r excludeRegex=$(grep -E -v '^#|^$' ~/.sbtignore | paste -sd'|' -)
-
-  echoLine () {
-    local -r line="$1"
-    local -r line1="${line//\r\x1BM\x1B\[2K//g}"       # This strips the OverwriteLine code.
-    local -r line2="${line1//\x1B\[[0-9;]*[JKmsu]//g}" # This strips all codes - we test regexes against this.
-
-    if [[ $line2 =~ $excludeRegex ]]; then
-      [[ -n $debugUs ]] && echo "[X] $line1"
-    else
-      [[ -n $debugUs ]] && echo "    $line1" || echo "$line1"
-    fi
-  }
-
-  echoLine "Starting sbt with output filtering enabled."
-  main | while read -r line; do echoLine "$line"; done
-}
-
-# Only filter if there's a filter file and we don't see a known interactive command.
-# Obviously this is super ad hoc but I don't know how to improve on it. Testing whether
-# stdin is a terminal is useless because most of my use cases for this filtering are
-# exactly when I'm at a terminal, running sbt non-interactively.
-shouldFilter () { [[ -f ~/.sbtignore ]] && ! grep -E -q '\b(shell|console|consoleProject)\b' <<<"${residual_args[@]}"; }
-
-# run sbt
-if shouldFilter; then mainFiltered; else main; fi