Teach install-build-deps.sh --arm how to install the arm root image.

build/install-build-deps.sh

 #!/bin/bash -e
 
 # 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.
 
 # Script to install everything needed to build chromium (well, ideally, anyway)
 # See http://code.google.com/p/chromium/wiki/LinuxBuildInstructions
 # and http://code.google.com/p/chromium/wiki/LinuxBuild64Bit
 
@@ skipping 177 matching lines @@
 fi
 if test "$do_inst_syms" = "1"; then
   echo "Installing debugging symbols."
 else
   echo "Skipping installation of debugging symbols."
   dbg_list=
 fi
 
 if test "$do_inst_arm" = "1"; then
   . /etc/lsb-release
-  if test "$DISTRIB_CODENAME" != "precise"; then
+  if [ "$DISTRIB_CODENAME" != "precise" ]; then
     echo "ERROR: Installing the ARM cross toolchain is only available on" \
          "Ubuntu precise." >&2
     exit 1
   fi
+
+  ROOT="$(dirname ${BASH_SOURCE[0]})"
+  ROOT="$(dirname ${ROOT})"
+  SYSROOT="${ROOT}/out/arm_root"
+  if [ ! -d ${SYSROOT} ]; then
+    echo "Installing ARM root image."
+    tarball=$(pwd)/out/naclsdk_linux_arm-trusted.tgz

[Lei Zhang, 2012/11/16 23:43:38]

Do you need to keep the tarball afterwards? Can you put in a tmp dir and then
delete it after untarring?

[Sam Clegg, 2012/12/05 23:18:07]

Done.

+    TC_URL_PREFIX=https://commondatastorage.googleapis.com/nativeclient-archive2/toolchain
+    TC_REV=8000
+
+    curl -L \

[tony, 2012/11/16 23:50:06]

It seems like at this point, curl hasn't been installed by this script yet.

[Sam Clegg, 2012/12/05 23:18:07]

Done.

+       ${TC_URL_PREFIX}/${TC_REV}/naclsdk_linux_arm-trusted.tgz \
+       -o ${tarball}
+
+    mkdir -p ${SYSROOT}
+    tar zxf ${tarball} -C ${SYSROOT}
+  fi
   echo "Installing ARM cross toolchain."
 else
   echo "Skipping installation of ARM cross toolchain."
   arm_list=
 fi
 
 sudo apt-get update
 
 # We initially run "apt-get" with the --reinstall option and parse its output.
 # This way, we can find all the packages that need to be newly installed
@@ skipping 222 matching lines @@
              sed -e 's/[.]so[.][0-9].*/.so/' |
              sort -u); do
     [ "x${i##*/}" = "xld-linux.so" ] && continue
     [ -r "$i" ] && continue
     j="$(ls "$i."* | sed -e 's/.*[.]so[.]\([^.]*\)$/\1/;t;d' |
          sort -n | tail -n 1)"
     [ -r "$i.$j" ] || continue
     sudo ln -s "${i##*/}.$j" "$i"
   done
 fi