Remove java version checks

The build now uses a prebuilt javac binary distributed with the
source, checking the host java version is no longer required.

Test: m -j checkbuild
Bug: 62956999
Change-Id: Ieef83481d0e6d68371bbd8a422f870ffe2bbb428

3 files changed, 0 insertions, 170 deletions

diff --git a/ui/build/Android.bp b/ui/build/Android.bp
index 23a98721..548baeed 100644
--- a/ui/build/Android.bp
+++ b/ui/build/Android.bp
@@ -27,7 +27,6 @@ bootstrap_go_package {
         "context.go",
         "environment.go",
         "exec.go",
-        "java.go",
         "kati.go",
         "make.go",
         "ninja.go",
diff --git a/ui/build/build.go b/ui/build/build.go
index 1400c48e..32f4ba57 100644
--- a/ui/build/build.go
+++ b/ui/build/build.go
@@ -114,9 +114,6 @@ func Build(ctx Context, config Config, what int) {
 		return
 	}
 
-	// Start getting java version as early as possible
-	getJavaVersions(ctx, config)
-
 	// Make sure that no other Soong process is running with the same output directory
 	buildLock := BecomeSingletonOrFail(ctx, config)
 	defer buildLock.Unlock()
@@ -148,9 +145,6 @@ func Build(ctx Context, config Config, what int) {
 		runSoong(ctx, config)
 	}
 
-	// Check the java versions we read earlier
-	checkJavaVersion(ctx, config)
-
 	if what&BuildKati != 0 {
 		// Run ckati
 		runKati(ctx, config)
diff --git a/ui/build/java.go b/ui/build/java.go
deleted file mode 100644
index 473af012..00000000
--- a/ui/build/java.go
+++ /dev/null
@@ -1,163 +0,0 @@
-// Copyright 2017 Google Inc. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package build
-
-import (
-	"regexp"
-	"runtime"
-	"strings"
-	"sync"
-)
-
-const incompatibleJavacStr = "google"
-
-var javaVersionInfo = struct {
-	once      sync.Once
-	startOnce sync.Once
-
-	java_version_output  string
-	javac_version_output string
-}{}
-
-func getJavaVersions(ctx Context, config Config) {
-	javaVersionInfo.startOnce.Do(func() {
-		go func() {
-			if ctx.Tracer != nil {
-				thread := ctx.Tracer.NewThread("java_version")
-				ctx.Tracer.Begin("get version", thread)
-				defer ctx.Tracer.End(thread)
-			}
-
-			getJavaVersionsImpl(ctx, config)
-		}()
-	})
-}
-
-func getJavaVersionsImpl(ctx Context, config Config) {
-	javaVersionInfo.once.Do(func() {
-		cmd := Command(ctx, config, "java", "java", "-version")
-		cmd.Environment.Unset("_JAVA_OPTIONS")
-		javaVersionInfo.java_version_output = string(cmd.CombinedOutputOrFatal())
-
-		cmd = Command(ctx, config, "javac", "javac", "-version")
-		cmd.Environment.Unset("_JAVA_OPTIONS")
-		javaVersionInfo.javac_version_output = string(cmd.CombinedOutputOrFatal())
-	})
-}
-
-func checkJavaVersion(ctx Context, config Config) {
-	ctx.BeginTrace("java_version_check")
-	defer ctx.EndTrace()
-
-	getJavaVersionsImpl(ctx, config)
-
-	var required_java_version string
-	var java_version_regexp *regexp.Regexp
-	var javac_version_regexp *regexp.Regexp
-
-	oj9_env, _ := config.Environment().Get("EXPERIMENTAL_USE_OPENJDK9")
-	experimental_use_openjdk9 := oj9_env != ""
-
-	if experimental_use_openjdk9 {
-		required_java_version = "9"
-		java_version_regexp = regexp.MustCompile(`^java .* "9.*"`)
-		javac_version_regexp = regexp.MustCompile(`^javac 9`)
-	} else {
-		required_java_version = "1.8"
-		java_version_regexp = regexp.MustCompile(`[ "]1\.8[\. "$]`)
-		javac_version_regexp = java_version_regexp
-	}
-
-	java_version := javaVersionInfo.java_version_output
-	javac_version := javaVersionInfo.javac_version_output
-
-	found := false
-	for _, l := range strings.Split(java_version, "\n") {
-		if java_version_regexp.MatchString(l) {
-			java_version = l
-			found = true
-			break
-		}
-	}
-	if !found {
-		ctx.Println("***************************************************************")
-		ctx.Println("You are attempting to build with the incorrect version of java.")
-		ctx.Println()
-		ctx.Println("Your version is:", java_version)
-		ctx.Println("The required version is:", required_java_version+".x")
-		ctx.Println()
-		ctx.Println("Please follow the machine setup instructions at:")
-		ctx.Println("    https://source.android.com/source/initializing.html")
-		ctx.Println("***************************************************************")
-		ctx.Fatalln("stop")
-	}
-
-	if runtime.GOOS == "linux" {
-		// Early access builds of OpenJDK 9 do not contain the string "openjdk" in the
-		// version name. TODO(tobiast): Reconsider once the OpenJDK 9 toolchain is stable.
-		// http://b/62123342
-		if !strings.Contains(java_version, "openjdk") && !experimental_use_openjdk9 {
-			ctx.Println("*******************************************************")
-			ctx.Println("You are attempting to build with an unsupported JDK.")
-			ctx.Println()
-			ctx.Println("Only an OpenJDK based JDK is supported.")
-			ctx.Println()
-			ctx.Println("Please follow the machine setup instructions at:")
-			ctx.Println("    https://source.android.com/source/initializing.html")
-			ctx.Println("*******************************************************")
-			ctx.Fatalln("stop")
-		}
-	} else { // darwin
-		if strings.Contains(java_version, "openjdk") {
-			ctx.Println("*******************************************************")
-			ctx.Println("You are attempting to build with an unsupported JDK.")
-			ctx.Println()
-			ctx.Println("You use OpenJDK, but only Sun/Oracle JDK is supported.")
-			ctx.Println()
-			ctx.Println("Please follow the machine setup instructions at:")
-			ctx.Println("    https://source.android.com/source/initializing.html")
-			ctx.Println("*******************************************************")
-			ctx.Fatalln("stop")
-		}
-	}
-
-	incompatible_javac := strings.Contains(javac_version, incompatibleJavacStr)
-
-	found = false
-	for _, l := range strings.Split(javac_version, "\n") {
-		if javac_version_regexp.MatchString(l) {
-			javac_version = l
-			found = true
-			break
-		}
-	}
-	if !found || incompatible_javac {
-		ctx.Println("****************************************************************")
-		ctx.Println("You are attempting to build with the incorrect version of javac.")
-		ctx.Println()
-		ctx.Println("Your version is:", javac_version)
-		if incompatible_javac {
-			ctx.Println("The '" + incompatibleJavacStr + "' version is not supported for Android platform builds.")
-			ctx.Println("Use a publically available JDK and make sure you have run envsetup.sh / lunch.")
-		} else {
-			ctx.Println("The required version is:", required_java_version)
-		}
-		ctx.Println()
-		ctx.Println("Please follow the machine setup instructions at:")
-		ctx.Println("    https://source.android.com/source/initializing.html")
-		ctx.Println("****************************************************************")
-		ctx.Fatalln("stop")
-	}
-}