Add update-linux-sandbox.sh to build/

build/update-linux-sandbox.sh

+#!/bin/sh
+
+# Copyright (c) 2012 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.
+BUILDTYPE=${BUILDTYPE:-"Debug"}

[cmp, 2012/06/05 22:54:20]

nit: really the empty line should happen before BUILDTYPE, point taken that i
said "before line 2," though.  can you make that change here?  (remove empty
line 2, insert an empty line before "BUILDTYPE")

[jln (very slow on Chromium), 2012/06/05 23:01:44]

I think there was a race condition, I had already uploaded a minor update to
address that.

It looks like scripts usually have a blank like both before and after the
copyright. That's what the new version does. Let me know if that's not ok.

+CHROME_SRC_DIR=${CHROME_SRC_DIR:-$(dirname $(readlink -fn $0))/..}
+CHROME_OUT_DIR="${CHROME_SRC_DIR}/out/${BUILDTYPE}"
+chrome_sandbox_build_path="${CHROME_OUT_DIR}/chrome_sandbox"
+# Make sure the path below is not on NFS!
+chrome_sandbox_installed_path="/usr/local/sbin/chrome-devel-sandbox"
+
+if [ ! -d "$CHROME_OUT_DIR" ]; then
+  echo -n "$CHROME_OUT_DIR does not exist. Use \"BUILDTYPE=Release ${0}\" "
+  echo "If you are building in Release mode"
+  exit 1
+fi
+
+if [ ! -f "$chrome_sandbox_build_path" ]; then
+  echo -n "Could not find $chrome_sandbox_build_path, "
+  echo "please make sure you build the chrome_sandbox target"
+  exit 1
+fi
+
+installsandbox() {
+  sudo -- cp "$chrome_sandbox_build_path" "$chrome_sandbox_installed_path" &&
+  sudo -- chown root:root "$chrome_sandbox_installed_path" &&
+  sudo -- chmod 4755 "$chrome_sandbox_installed_path"
+  return $?
+}
+
+if [ ! -f "$chrome_sandbox_installed_path" ]; then
+  echo -n "Could not find $chrome_sandbox_installed_path, "
+  echo "installing it now."
+  installsandbox
+fi
+
+if [ ! -f "$chrome_sandbox_installed_path" ]; then
+  echo "Failed to install $chrome_sandbox_installed_path"
+  exit 1
+fi
+
+current_api=$($chrome_sandbox_build_path --get-api)
+installed_api=$($chrome_sandbox_installed_path --get-api)
+
+if [ x$current_api != x$installed_api ]; then
+  echo -n "Your installed setuid sandbox is too old, installing it now."
+  installsandbox
+  if [ ! $? = 0 ]; then

[cmp, 2012/06/05 22:54:20]

i believe lines 48-49 can be simplified as:
if ! installsandbox; then

[jln (very slow on Chromium), 2012/06/05 23:01:44]

Done, thanks.

+    echo "Failed to install $chrome_sandbox_installed_path"
+    exit 1
+  fi
+else
+  echo "Your setuid sandbox is up to date"
+  if [ x$CHROME_DEVEL_SANDBOX != x"$chrome_sandbox_installed_path" ]; then
+    echo -n "Make sure you have \"export "
+    echo -n "CHROME_DEVEL_SANDBOX=$chrome_sandbox_installed_path\" "
+    echo "somewhere in your .bashrc"
+    echo "This variable is currently: ${CHROME_DEVEL_SANDBOX:-"empty"}"
+  fi
+fi