Refactor adb_*_command_line helpers bash->python

* Now targets all devices by default rather than failing
* Allows --device flag to target a specific device

BUG=

Review URL: https://codereview.chromium.org/1469143002

Cr-Commit-Position: refs/heads/master@{#361343}

build/android/adb_android_webview_command_line

@@ -13,8 +13,5 @@
 # To remove all content shell flags, pass an empty string for the flags:
 #   adb_android_webview_command_line ""
 
-. $(dirname $0)/adb_command_line_functions.sh
-CMD_LINE_FILE=/data/local/tmp/android-webview-command-line
-REQUIRES_SU=0
-set_command_line "$@"
-
+exec $(dirname $0)/adb_command_line.py --device-path \
+    /data/local/tmp/android-webview-command-line "$@"

build/android/adb_blimp_command_line

@@ -13,7 +13,5 @@
 # To remove all Blimp flags, pass an empty string for the flags:
 #   adb_blimp_command_line ""
 
-. $(dirname $0)/adb_command_line_functions.sh
-CMD_LINE_FILE=/data/local/blimp-command-line
-REQUIRES_SU=1
-set_command_line "$@"
+exec $(dirname $0)/adb_command_line.py --device-path \
+    /data/local/blimp-command-line "$@"

build/android/adb_chrome_public_command_line

@@ -13,7 +13,5 @@
 # To remove all Chrome flags, pass an empty string for the flags:
 #   adb_chrome_public_command_line ""
 
-. $(dirname $0)/adb_command_line_functions.sh
-CMD_LINE_FILE=/data/local/chrome-command-line
-REQUIRES_SU=1
-set_command_line "$@"
+exec $(dirname $0)/adb_command_line.py --device-path \
+    /data/local/chrome-command-line "$@"

build/android/adb_command_line.py

+#!/usr/bin/python
+# 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.
+
+"""Utility for reading / writing command-line flag files on device(s)."""
+
+import argparse
+import sys
+
+from devil.android import device_utils
+from devil.android import device_errors
+from devil.utils import cmd_helper
+
+
+def main():
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.usage = '''%(prog)s --device-path PATH [--device SERIAL] [flags...]
+
+No flags: Prints existing command-line file.
+Empty string: Deletes command-line file.
+Otherwise: Writes command-line file.
+
+'''
+  parser.add_argument('-d', '--device', dest='device',
+                      help='Target device for apk to install on.')
+  parser.add_argument('--device-path', required=True,
+                      help='Remote path to flags file.')
+  args, remote_args = parser.parse_known_args()
+
+  as_root = not args.device_path.startswith('/data/local/tmp/')
+
+  if args.device:
+    devices = [device_utils.DeviceUtils(args.device, default_retries=0)]
+  else:
+    devices = device_utils.DeviceUtils.HealthyDevices(default_retries=0)
+    if not devices:
+      raise device_errors.NoDevicesError()
+
+  all_devices = device_utils.DeviceUtils.parallel(devices)
+
+  def print_args():
+    def read_flags(device):
+      try:
+        return device.ReadFile(args.device_path, as_root=as_root)
+      except device_errors.AdbCommandFailedError:
+        return '\n'  # File might not exist.
+
+    descriptions = all_devices.pMap(lambda d: d.build_description).pGet(None)
+    flags = all_devices.pMap(read_flags).pGet(None)
+    for d, desc, flags in zip(devices, descriptions, flags):
+      print '  %s (%s): %s' % (d, desc, flags),
+
+  # No args == print flags.
+  if not remote_args:
+    print 'Existing flags (in %s):' % args.device_path
+    print_args()
+    return 0
+
+  # Empty string arg == delete flags file.
+  if len(remote_args) == 1 and not remote_args[0]:
+    def delete_flags(device):
+      device.RunShellCommand(['rm', '-f', args.device_path], as_root=as_root)
+    all_devices.pMap(delete_flags).pGet(None)
+    print 'Deleted %s' % args.device_path
+    return 0
+
+  # Set flags.
+  quoted_args = ' '.join(cmd_helper.SingleQuote(x) for x in remote_args)
+  flags_str = 'chrome %s' % quoted_args
+
+  def write_flags(device):
+    device.WriteFile(args.device_path, flags_str, as_root=as_root)
+    device.RunShellCommand(['chmod', '0664', args.device_path], as_root=as_root)
+
+  all_devices.pMap(write_flags).pGet(None)
+  print 'Wrote flags to %s' % args.device_path
+  print_args()
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())

build/android/adb_command_line_functions.sh

-#!/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
-}
-

build/android/adb_content_shell_command_line

@@ -13,8 +13,5 @@
 # To remove all content shell flags, pass an empty string for the flags:
 #   adb_content_shell_command_line ""
 
-. $(dirname $0)/adb_command_line_functions.sh
-CMD_LINE_FILE=/data/local/tmp/content-shell-command-line
-REQUIRES_SU=0
-set_command_line "$@"
-
+exec $(dirname $0)/adb_command_line.py --device-path \
+    /data/local/tmp/content-shell-command-line "$@"

build/android/adb_system_webview_command_line

@@ -13,8 +13,5 @@
 # To remove all content shell flags, pass an empty string for the flags:
 #   adb_android_webview_command_line ""
 
-. $(dirname $0)/adb_command_line_functions.sh
-CMD_LINE_FILE=/data/local/tmp/webview-command-line
-REQUIRES_SU=0
-set_command_line "$@"
-
+exec $(dirname $0)/adb_command_line.py --device-path \
+    /data/local/tmp/webview-command-line "$@"