Fix adb_chrome_public_command_line for Android M & refactor into a helper .sh

BUG=493878

Review URL: https://codereview.chromium.org/1165753002

Cr-Original-Commit-Position: refs/heads/master@{#332263}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c481d6771df7cfd731ab174b561388fca8596ce1

android/adb_android_webview_command_line

@@ -13,25 +13,8 @@
 # To remove all content shell flags, pass an empty string for the flags:
 #   adb_android_webview_command_line ""
 
+. $(dirname $0)/adb_command_line_functions.sh
 CMD_LINE_FILE=/data/local/tmp/android-webview-command-line
-
-if [ $# -eq 0 ] ; then
-  # If nothing specified, print the command line (stripping off "content_shell")
-  tempfile=$(tempfile)
-  adb pull $CMD_LINE_FILE $tempfile 2>/dev/null
-  if [ $? -eq 0 ] ; then
-    rm $tempfile
-    adb shell cat $CMD_LINE_FILE | cut -d " " -f "2-" 2>/dev/null
-  fi
-elif [ $# -eq 1 ] && [ "$1" = '' ] ; then
-  # If given an empty string, delete the command line.
-  set -x
-  adb shell rm $CMD_LINE_FILE >/dev/null
-else
-  # Else set it.
-  set -x
-  adb shell "echo 'android_webview $*' > $CMD_LINE_FILE"
-  # Prevent other apps from modifying flags -- this can create security issues.
-  adb shell chmod 0664 $CMD_LINE_FILE
-fi
+REQUIRES_SU=0
+set_command_line "$@"
 

android/adb_chrome_public_command_line

@@ -13,25 +13,7 @@
 # To remove all Chrome flags, pass an empty string for the flags:
 #   adb_chrome_public_command_line ""
 
+. $(dirname $0)/adb_command_line_functions.sh
 CMD_LINE_FILE=/data/local/chrome-command-line
-
-if [ $# -eq 0 ] ; then
-  # If nothing specified, print the command line (stripping off "chrome")
-  tempfile=$(tempfile)
-  adb pull $CMD_LINE_FILE $tempfile 2>/dev/null
-  if [ $? -eq 0 ] ; then
-    rm $tempfile
-    adb shell cat $CMD_LINE_FILE | cut -d " " -f "2-" 2>/dev/null
-  fi
-elif [ $# -eq 1 ] && [ "$1" = '' ] ; then
-  # If given an empty string, delete the command line.
-  set -x
-  adb shell su -c rm $CMD_LINE_FILE >/dev/null
-else
-  # Else set it.
-  set -x
-  adb shell "echo 'chrome $*' | su -c dd of=$CMD_LINE_FILE"
-  # Prevent other apps from modifying flags -- this can create security issues.
-  adb shell su -c chmod 0664 $CMD_LINE_FILE
-fi
-
+REQUIRES_SU=1
+set_command_line "$@"

android/adb_chrome_shell_command_line

@@ -13,25 +13,8 @@
 # To remove all chrome shell flags, pass an empty string for the flags:
 #   adb_chrome_shell_command_line ""
 
+. $(dirname $0)/adb_command_line_functions.sh
 CMD_LINE_FILE=/data/local/tmp/chrome-shell-command-line
-
-if [ $# -eq 0 ] ; then
-  # If nothing specified, print the command line (stripping off "chrome_shell")
-  tempfile=$(tempfile)
-  adb pull $CMD_LINE_FILE $tempfile 2>/dev/null
-  if [ $? -eq 0 ] ; then
-    rm $tempfile
-    adb shell cat $CMD_LINE_FILE | cut -d " " -f "2-" 2>/dev/null
-  fi
-elif [ $# -eq 1 ] && [ "$1" = '' ] ; then
-  # If given an empty string, delete the command line.
-  set -x
-  adb shell rm $CMD_LINE_FILE >/dev/null
-else
-  # Else set it.
-  set -x
-  adb shell "echo 'chrome_shell $*' > $CMD_LINE_FILE"
-  # Prevent other apps from modifying flags -- this can create security issues.
-  adb shell chmod 0664 $CMD_LINE_FILE
-fi
+REQUIRES_SU=0
+set_command_line "$@"
 

android/adb_command_line_functions.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+#
+# 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.
+
+# Variables must be set before calling:
+# CMD_LINE_FILE - Path on device to flags file.
+# REQUIRES_SU - Set to 1 if path requires root.
+function set_command_line() {
+  SU_CMD=""
+  if [[ "$REQUIRES_SU" = 1 ]]; then
+    # Older androids accept "su -c", while newer use "su uid".
+    SDK_LEVEL=$(adb shell getprop ro.build.version.sdk | tr -d '\r')
+    # E.g. if no device connected.
+    if [[ -z "$SDK_LEVEL" ]]; then
+      exit 1
+    fi
+    SU_CMD="su -c"
+    if (( $SDK_LEVEL >= 21 )); then
+      SU_CMD="su 0"
+    fi
+  fi
+
+  if [ $# -eq 0 ] ; then
+    # If nothing specified, print the command line (stripping off "chrome ")
+    adb shell "cat $CMD_LINE_FILE 2>/dev/null | cut -d ' ' -s -f2-"
+  elif [ $# -eq 1 ] && [ "$1" = '' ] ; then
+    # If given an empty string, delete the command line.
+    set -x
+    adb shell $SU_CMD rm $CMD_LINE_FILE >/dev/null
+  else
+    # Else set it.
+    set -x
+    adb shell "echo 'chrome $*' | $SU_CMD dd of=$CMD_LINE_FILE"
+    # Prevent other apps from modifying flags (this can create security issues).
+    adb shell $SU_CMD chmod 0664 $CMD_LINE_FILE
+  fi
+}
+

android/adb_content_shell_command_line

@@ -13,25 +13,8 @@
 # To remove all content shell flags, pass an empty string for the flags:
 #   adb_content_shell_command_line ""
 
+. $(dirname $0)/adb_command_line_functions.sh
 CMD_LINE_FILE=/data/local/tmp/content-shell-command-line
-
-if [ $# -eq 0 ] ; then
-  # If nothing specified, print the command line (stripping off "content_shell")
-  tempfile=$(tempfile)
-  adb pull $CMD_LINE_FILE $tempfile 2>/dev/null
-  if [ $? -eq 0 ] ; then
-    rm $tempfile
-    adb shell cat $CMD_LINE_FILE | cut -d " " -f "2-" 2>/dev/null
-  fi
-elif [ $# -eq 1 ] && [ "$1" = '' ] ; then
-  # If given an empty string, delete the command line.
-  set -x
-  adb shell rm $CMD_LINE_FILE >/dev/null
-else
-  # Else set it.
-  set -x
-  adb shell "echo 'content_shell $*' > $CMD_LINE_FILE"
-  # Prevent other apps from modifying flags -- this can create security issues.
-  adb shell chmod 0664 $CMD_LINE_FILE
-fi
+REQUIRES_SU=0
+set_command_line "$@"