Better handle failures in pipes in debian/build.sh

chrome/installer/linux/debian/build.sh

 #!/bin/bash
 #
 # 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.
 
 # TODO(mmoss) This currently only works with official builds, since non-official
 # builds don't add the "${BUILDDIR}/installer/" files needed for packaging.
 
 set -e
+set -o pipefail
 if [ "$VERBOSE" ]; then
   set -x
 fi
 set -u
 
 # Create the Debian changelog file needed by dpkg-gencontrol. This just adds a
 # placeholder change, indicating it is the result of an automatic build.
 # TODO(mmoss) Release packages should create something meaningful for a
 # changelog, but simply grabbing the actual 'svn log' is way too verbose. Do we
 # have any type of "significant/visible changes" log that we could use for this?
@@ skipping 232 matching lines @@
 
 # Generate the dependencies,
 # TODO(mmoss): This is a workaround for a problem where dpkg-shlibdeps was
 # resolving deps using some of our build output shlibs (i.e.
 # out/Release/lib.target/libfreetype.so.6), and was then failing with:
 #   dpkg-shlibdeps: error: no dependency information found for ...
 # It's not clear if we ever want to look in LD_LIBRARY_PATH to resolve deps,
 # but it seems that we don't currently, so this is the most expediant fix.
 SAVE_LDLP=${LD_LIBRARY_PATH:-}
 unset LD_LIBRARY_PATH
-DPKG_SHLIB_DEPS=$(dpkg-shlibdeps -O "$BUILDDIR/chrome" 2> /dev/null | \
+DPKG_SHLIB_DEPS=$(dpkg-shlibdeps -O "$BUILDDIR/chrome" | \
   sed 's/^shlibs:Depends=//')
 if [ -n "$SAVE_LDLP" ]; then
   LD_LIBRARY_PATH=$SAVE_LDLP
 fi
 
 # Format it nicely and save it for comparison.
 # The grep -v is for a duplicate libc6 dep caused by Lucid glibc silliness.
 echo "$DPKG_SHLIB_DEPS" | sed 's/, /\n/g' | \
   grep -v '^libc6 (>= 2.3.6-6~)$' > actual
 
@@ skipping 47 matching lines @@
     ;;
   * )
     echo
     echo "ERROR: Don't know how to build DEBs for '$TARGETARCH'."
     echo
     exit 1
     ;;
 esac
 
 do_package