Remove C++ from build files (elastic/elasticsearch#739)

NB: The actual C++ code will be deleted in a separate commit to
avoid swamping this commit.

If you want to have the Java build pick up locally built C++ then:

export CPP_LOCAL_DISTS=$CPP_SRC_HOME/build/distributions

Otherwise, C++ artifacts will be downloaded from S3.

Original commit: elastic/x-pack-elasticsearch@246672e81d

build.gradle

@@ -1,4 +1,4 @@
-description = 'Builds the Ml Engine native binaries and Java classes'
+description = 'Builds the Machine Learning Java classes and UI'
 
 import org.gradle.internal.os.OperatingSystem
 import org.gradle.plugins.ide.eclipse.model.SourceFolder
@@ -20,53 +20,25 @@ if (envMlAwsSecretKey != null) {
   project.ext.mlAwsSecretKey = PRELERT_AWS_SECRET_ACCESS_KEY
 }
 
-String cppCrossCompile = System.env.CPP_CROSS_COMPILE
-if (cppCrossCompile != null) {
-  project.ext.cppCrossCompile = cppCrossCompile
-} else if (project.hasProperty("CPP_CROSS_COMPILE")) {
-  project.ext.cppCrossCompile = CPP_CROSS_COMPILE
+String envCppLocalDists = System.env.CPP_LOCAL_DISTS
+if (envCppLocalDists != null) {
+  project.ext.cppLocalDists = envCppLocalDists
+} else if (project.hasProperty("CPP_LOCAL_DISTS")) {
+  project.ext.cppLocalDists = CPP_LOCAL_DISTS
 } else {
-  project.ext.cppCrossCompile = ''
-}
-if (project.ext.cppCrossCompile != '' && project.ext.cppCrossCompile != 'macosx') {
-  throw new GradleException("CPP_CROSS_COMPILE property must be empty or 'macosx'")
+  project.ext.cppLocalDists = ''
 }
 
 project.ext.isWindows = OperatingSystem.current().isWindows()
 project.ext.isLinux = OperatingSystem.current().isLinux()
 project.ext.isMacOsX = OperatingSystem.current().isMacOsX()
 
-project.ext.bash = project.isWindows ? "C:\\Program Files\\Git\\bin\\bash" : "/bin/bash"
-
 String uploadEnabledStr = properties.get('upload', 'false')
 if (['true', 'false'].contains(uploadEnabledStr) == false) {
   throw new GradleException("upload must be true or false, got ${uploadEnabledStr}")
 }
 project.ext.uploadEnabled = uploadEnabledStr == 'true'
 
-// C++ build can be explicitly enabled or disabled, or if neither is chosen
-// it will be enabled if the necessary 3rd party dependencies are present
-String cppEnabledStr = properties.get('xpack.cpp.build', 'auto')
-if (['true', 'false', 'auto'].contains(cppEnabledStr) == false) {
-  throw new GradleException("xpack.cpp.build must be true or false, got ${cppEnabledStr}")
-}
-project.ext.cppEnabled = cppEnabledStr == 'true'
-if (cppEnabledStr == 'auto') {
-  // Disable the C++ build if the 3rd party tools/libraries aren't available
-  String[] cmdArray = [ project.ext.bash, '-c',
-    'export CPP_CROSS_COMPILE=' + project.ext.cppCrossCompile + ' && source cpp/set_env.sh && cpp/3rd_party/3rd_party.sh --check' ]
-  Process checkProcess = Runtime.getRuntime().exec(cmdArray, null, rootDir)
-  StringBuffer checkOutput = new StringBuffer()
-  checkProcess.consumeProcessOutputStream(checkOutput)
-  if (checkProcess.waitFor() == 0) {
-    project.ext.cppEnabled = true
-  } else {
-    println 'C++ dependencies not available - disabling C++ build'
-    println checkOutput
-    project.ext.cppEnabled = false
-  }
-}
-
 allprojects {
   group = 'org.elasticsearch.ml'
   version = VersionProperties.elasticsearch
@@ -123,7 +95,7 @@ task assemble(dependsOn: bundlePack) {
   description = 'Assembles the outputs of this project.'
 }
 
-task test(dependsOn: [':elasticsearch:test', ':cpp:test', ':kibana:test']) {
+task test(dependsOn: [':elasticsearch:test', ':kibana:test']) {
   group = 'Build'
   description = 'Assembles and tests this project.'
 }
@@ -139,14 +111,14 @@ task clean(type: Delete) {
   delete 'build'
 }
 
-task uploadPackToS3(type: UploadS3Task, dependsOn: [build]) {
+task uploadPackToS3(type: UploadS3Task, dependsOn: build) {
   enabled project.uploadEnabled
   description = 'upload pack zip to S3 Bucket'
   bucket 'prelert-artifacts'
   upload bundlePack.outputs.files.singleFile, "maven/${project.group}/${packArtifactName}/${project.version}/${bundlePack.outputs.files.singleFile.name}"
 }
 
-task deploy(dependsOn: [uploadPackToS3, ':cpp:upload']) {
+task deploy(dependsOn: uploadPackToS3) {
 
 }
 
@@ -199,7 +171,6 @@ allprojects {
   }
 }
 
-// intellij configuration
 allprojects {
   apply plugin: 'idea'
 

elasticsearch/build.gradle

@@ -5,7 +5,7 @@ apply plugin: 'elasticsearch.esplugin'
 
 esplugin {
     name 'ml'
-    description 'Ml Plugin'
+    description 'Machine Learning Plugin'
     classname 'org.elasticsearch.xpack.ml.MlPlugin'
 }
 
@@ -32,8 +32,6 @@ check.dependsOn noBootstrapTest
 noBootstrapTest.mustRunAfter test
 
 integTest {
-    // Cannot run integration tests when cross compiling
-    enabled project.cppCrossCompile == ''
     cluster {
         //setting 'useNativeProcess', 'true'
         distribution = 'zip'
@@ -43,8 +41,8 @@ integTest {
 integTest.mustRunAfter noBootstrapTest
 
 task downloadCppDist(type: DownloadS3Task) {
-  enabled project.cppEnabled == false
-  description = 'download cpp zips from S3 Bucket'
+  enabled project.cppLocalDists == ''
+  description = 'Download C++ zips from S3 Bucket'
   bucket 'prelert-artifacts'
   destDir file("${buildDir}/cppDist")
   flatten true
@@ -57,12 +55,17 @@ task downloadCppDist(type: DownloadS3Task) {
 }
 
 bundlePlugin {
-  if (project.cppEnabled) {
-    from { zipTree(project(':cpp').buildZip.outputs.files.singleFile) }
-    dependsOn ':cpp:buildZip'
+  if (project.cppLocalDists) {
+    String localZipFile = 'ml-cpp-' +
+      (project.isWindows ? "windows-x86_64" : (project.isMacOsX ? "darwin-x86_64" :
+      (project.isLinux ? "linux-x86_64" : "sunos-x86_64"))) +
+      "-${project.version}.zip"
+    from { zipTree(cppLocalDists + '/' + localZipFile) }
   } else {
     for (outputFile in downloadCppDist.outputs.files) {
-      from(zipTree(outputFile))
+      from(zipTree(outputFile)) {
+        duplicatesStrategy 'exclude'
+      }
     }
     dependsOn 'downloadCppDist'
   }

settings.gradle

@@ -1,5 +1,4 @@
 rootProject.name = 'ml'
-include ':cpp'
 include ':elasticsearch'
 include ':docs'
 include ':kibana'