Make --no-prompt --lib32 install lib32 support.

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 140 matching lines @@
 else
   dev_list="${dev_list} libudev0"
 fi
 if package_exists libbrlapi0.6; then
   dev_list="${dev_list} libbrlapi0.6"
 else
   dev_list="${dev_list} libbrlapi0.5"
 fi
 
 
-# Some packages are only needed, if the distribution actually supports
+# Some packages are only needed if the distribution actually supports

[Peter Mayo, 2013/09/27 04:48:46]

This is just a little readability tweak.

 # installing them.
 if package_exists appmenu-gtk; then
   lib_list="$lib_list appmenu-gtk"
 fi
 
 # Waits for the user to press 'Y' or 'N'. Either uppercase of lowercase is
 # accepted. Returns 0 for 'Y' and 1 for 'N'. If an optional parameter has
 # been provided to yes_no(), the function also accepts RETURN as a user input.
 # The parameter specifies the exit code that should be returned in that case.
 # The function will echo the user's selection followed by a newline character.
 # Users can abort the function by pressing CTRL-C. This will call "exit 1".
 yes_no() {
   if [ 0 -ne "${do_default-0}" ] ; then
+    [ $1 -eq 0 ] && echo "Y" || echo "N"

[Peter Mayo, 2013/09/27 04:48:46]

Prompt messages in a log that are unclear how they were answered are obnoxiously
useless.

     return $1
   fi
   local c
   while :; do
     c="$(trap 'stty echo -iuclc icanon 2>/dev/null' EXIT INT TERM QUIT
          stty -echo iuclc -icanon 2>/dev/null
          dd count=1 bs=1 2>/dev/null | od -An -tx1)"
     case "$c" in
       " 0a") if [ -n "$1" ]; then
                [ $1 -eq 0 ] && echo "Y" || echo "N"
@@ skipping 137 matching lines @@
     # this feature is needed.
     # We only even give the user the option to install these libraries, if
     # they explicitly requested doing so by setting the --lib32 command line
     # flag.
     # And even then, we interactively ask them one more time whether they are
     # absolutely sure.
     # In order for that to work, we must reset the ${do_inst_lib32} variable.
     # There are other ways to achieve the same goal. But resetting the
     # variable is the best way to document the intended behavior -- and to
     # allow us to gradually deprecate and then remove the obsolete code.
-    do_inst_lib32=
+    if test "${do_default-0}" -ne 1; then
+      do_inst_lib32=
+    fi
   fi
 
   echo "WARNING"
   echo
   echo "We no longer recommend that you use this script to install"
   echo "32bit libraries on a 64bit system. Instead, consider using the"
   echo "install-chroot.sh script to help you set up a 32bit environment"
   echo "for building and testing 32bit versions of Chrome."
   echo
   echo "The code for installing 32bit libraries on a 64bit system is"
   echo "unmaintained and might not work with modern versions of Ubuntu"
   echo "or Debian."
-  echo
-  echo -n "Are you sure you want to proceed (y/N) "
-  if yes_no 1; then
-    do_inst_lib32=1
+  if test "$do_inst_lib32" != "" ; then
+    echo
+    echo -n "Are you sure you want to proceed (y/N) "
+    if yes_no 1; then
+      do_inst_lib32=1
+    fi
   fi
   if test "$do_inst_lib32" != "1"
   then
     exit 0
   fi
 
   # Standard 32bit compatibility libraries
   echo "First, installing the limited existing 32-bit support..."
   cmp_list="ia32-libs lib32asound2-dev lib32stdc++6 lib32z1
             lib32z1-dev libc6-dev-i386 libc6-i386 g++-multilib"
@@ skipping 148 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