Add unsupported option to install-build-deps.

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 13 matching lines @@
   case "$1" in
   --syms)                   do_inst_syms=1;;
   --no-syms)                do_inst_syms=0;;
   --lib32)                  do_inst_lib32=1;;
   --no-lib32)               do_inst_lib32=0;;
   --arm)                    do_inst_arm=1;;
   --no-arm)                 do_inst_arm=0;;
   --no-prompt)              do_default=1
                             do_quietly="-qq --assume-yes"
     ;;
+  --unsupported)            do_unsupported=1;;
   *) usage;;
   esac
   shift
 done
 
 ubuntu_versions="10\.04|10\.10|11\.04|11\.10|12\.04|12\.10"
 ubuntu_codenames="lucid|maverick|natty|oneiric|precise|quantal"
+ubuntu_issue="Ubuntu ($ubuntu_versions|$ubuntu_codenames)"
+# GCEL is an Ubuntu-derived VM image used on Google Compute Engine; /etc/issue
+# doesn't contain a version number so just trust that the user knows what
+# they're doing.
+gcel_issue="^GCEL"
 
-if ! egrep -q "Ubuntu ($ubuntu_versions|$ubuntu_codenames)" /etc/issue; then
-  echo "ERROR: Only Ubuntu 10.04 (lucid) through 12.10 (quantal) are currently"\
-      "supported" >&2
-  exit 1
-fi
+if [ 0 -eq "${do_unsupported-0}" ] ; then
+  if ! egrep -q "($ubuntu_issue|$gcel_issue)" /etc/issue; then
+    echo "ERROR: Only Ubuntu 10.04 (lucid) through 12.10 (quantal) are"\
+        "currently supported" >&2
+    exit 1
+  fi
 
-if ! uname -m | egrep -q "i686|x86_64"; then
-  echo "Only x86 architectures are currently supported" >&2
-  exit
+  if ! uname -m | egrep -q "i686|x86_64"; then
+    echo "Only x86 architectures are currently supported" >&2
+    exit
+  fi
 fi
 
 if [ "x$(id -u)" != x0 ]; then
   echo "Running as non-root user."
   echo "You might have to enter your password one or more times for 'sudo'."
   echo
 fi
 
 # Packages needed for chromeos only
 chromeos_dev_list="libbluetooth-dev libpulse-dev"
@@ skipping 381 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