Move ChromeCommandLineInitUtil to base/

- Make ChromeCommandLineInitUtil accessible to other folders than chrome/.
- Pull out the command line file name to be passed as a parameter.

BUG=526219

Review URL: https://codereview.chromium.org/1364143002

Cr-Commit-Position: refs/heads/master@{#352349}

1 files changed, 107 insertions, 0 deletions

diff --git a/base/android/java/src/org/chromium/base/CommandLineInitUtil.java b/base/android/java/src/org/chromium/base/CommandLineInitUtil.java
new file mode 100644
index 0000000..6aa227c
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/CommandLineInitUtil.java
@@ -0,0 +1,107 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.os.Build;
+import android.provider.Settings;
+
+import org.chromium.base.annotations.SuppressFBWarnings;
+
+import java.io.File;
+
+/**
+ * Provides implementation of command line initialization for Android.
+ */
+public final class CommandLineInitUtil {
+
+    private static final String TAG = "CommandLineInitUtil";
+
+    /**
+     * The location of the command line file needs to be in a protected
+     * directory so requires root access to be tweaked, i.e., no other app in a
+     * regular (non-rooted) device can change this file's contents.
+     * See below for debugging on a regular (non-rooted) device.
+     */
+    private static final String COMMAND_LINE_FILE_PATH = "/data/local";
+
+    /**
+     * This path (writable by the shell in regular non-rooted "user" builds) is used when:
+     * 1) The "debug app" is set to the application calling this.
+     * and
+     * 2) ADB is enabled.
+     *
+     */
+    private static final String COMMAND_LINE_FILE_PATH_DEBUG_APP = "/data/local/tmp";
+
+    private CommandLineInitUtil() {
+    }
+
+    /**
+     * Initializes the CommandLine class, pulling command line arguments from {@code fileName}.
+     * @param context  The {@link Context} to use to query whether or not this application is being
+     *                 debugged, and whether or not the publicly writable command line file should
+     *                 be used.
+     * @param fileName The name of the command line file to pull arguments from.
+     */
+    @SuppressFBWarnings("DMI_HARDCODED_ABSOLUTE_FILENAME")
+    public static void initCommandLine(Context context, String fileName) {
+        if (!CommandLine.isInitialized()) {
+            File commandLineFile = getAlternativeCommandLinePath(context, fileName);
+            if (commandLineFile == null) {
+                commandLineFile = new File(COMMAND_LINE_FILE_PATH, fileName);
+            }
+            CommandLine.initFromFile(commandLineFile.getPath());
+        }
+    }
+
+    /**
+     * Use an alternative path if adb is enabled and this is the debug app.
+     */
+    @SuppressFBWarnings("DMI_HARDCODED_ABSOLUTE_FILENAME")
+    private static File getAlternativeCommandLinePath(Context context, String fileName) {
+        File alternativeCommandLineFile =
+                new File(COMMAND_LINE_FILE_PATH_DEBUG_APP, fileName);
+        if (!alternativeCommandLineFile.exists()) return null;
+        try {
+            String debugApp = Build.VERSION.SDK_INT < 17
+                    ? getDebugAppPreJBMR1(context) : getDebugAppJBMR1(context);
+
+            if (debugApp != null
+                    && debugApp.equals(context.getApplicationContext().getPackageName())) {
+                Log.i(TAG, "Using alternative command line file in "
+                        + alternativeCommandLineFile.getPath());
+                return alternativeCommandLineFile;
+            }
+        } catch (RuntimeException e) {
+            Log.e(TAG, "Unable to detect alternative command line file");
+        }
+
+        return null;
+    }
+
+    @SuppressLint("NewApi")
+    private static String getDebugAppJBMR1(Context context) {
+        boolean adbEnabled = Settings.Global.getInt(context.getContentResolver(),
+                Settings.Global.ADB_ENABLED, 0) == 1;
+        if (adbEnabled) {
+            return Settings.Global.getString(context.getContentResolver(),
+                    Settings.Global.DEBUG_APP);
+        }
+        return null;
+    }
+
+    @SuppressWarnings("deprecation")
+    private static String getDebugAppPreJBMR1(Context context) {
+        boolean adbEnabled = Settings.System.getInt(context.getContentResolver(),
+                Settings.System.ADB_ENABLED, 0) == 1;
+        if (adbEnabled) {
+            return Settings.System.getString(context.getContentResolver(),
+                    Settings.System.DEBUG_APP);
+        }
+        return null;
+    }
+}