Use sysroot for dpkg-shlibdeps when building debian package

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
@@ skipping 102 matching lines @@
   fakeroot dpkg-deb -Zxz -z9 -b "${STAGEDIR}" .
 }
 
 # Remove temporary files and unwanted packaging output.
 cleanup() {
   echo "Cleaning..."
   rm -rf "${STAGEDIR}"
   rm -rf "${TMPFILEDIR}"
 }
 
 usage() {

[Lei Zhang, 2016/10/06 18:49:20]

Update?

   echo "usage: $(basename $0) [-c channel] [-a target_arch] [-o 'dir'] "
   echo "                      [-b 'dir'] -d branding"
   echo "-c channel the package channel (trunk, asan, unstable, beta, stable)"
   echo "-a arch    package architecture (ia32 or x64)"
   echo "-o dir     package output directory [${OUTPUTDIR}]"
   echo "-b dir     build input directory    [${BUILDDIR}]"
   echo "-d brand   either chromium or google_chrome"
   echo "-h         this help message"
 }
 
@@ skipping 21 matching lines @@
     * )
       echo
       echo "ERROR: '$CHANNEL' is not a valid channel type."
       echo
       exit 1
       ;;
   esac
 }
 
 process_opts() {
-  while getopts ":o:b:c:a:d:h" OPTNAME
+  while getopts ":s:o:b:c:a:d:h" OPTNAME
   do
     case $OPTNAME in
       o )
         OUTPUTDIR=$(readlink -f "${OPTARG}")
         mkdir -p "${OUTPUTDIR}"
         ;;
       b )
         BUILDDIR=$(readlink -f "${OPTARG}")
         ;;
       c )
         CHANNEL="$OPTARG"
         ;;
       a )
         TARGETARCH="$OPTARG"
         ;;
       d )
         BRANDING="$OPTARG"
         ;;
+      s )
+        SYSROOT="$OPTARG"
+        ;;
       h )
         usage
         exit 0
         ;;
       \: )
         echo "'-$OPTARG' needs an argument."
         usage
         exit 1
         ;;
       * )
@@ skipping 63 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" | \
+if [[ -n ${SYSROOT:-} ]]; then
+  SHLIB_ARGS="--admindir=${SYSROOT}/var/lib/dpkg"
+fi
+DPKG_SHLIB_DEPS=$(dpkg-shlibdeps ${SHLIB_ARGS:-} -O "$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.

[Lei Zhang, 2016/10/06 18:49:20]

Can you also check if this can be removed?

 echo "$DPKG_SHLIB_DEPS" | sed 's/, /\n/g' | \
   grep -v '^libc6 (>= 2.3.6-6~)$' | LANG=C sort > actual
 
 # Compare the expected dependency list to the generate list.
 BAD_DIFF=0
 diff -u "$SCRIPTDIR/expected_deps_$TARGETARCH" actual || BAD_DIFF=1
 if [ $BAD_DIFF -ne 0 ] && [ -z "${IGNORE_DEPS_CHANGES:-}" ]; then
   echo
   echo "ERROR: Shared library dependencies changed!"
   echo "If this is intentional, please update:"
@@ skipping 49 matching lines @@
 # Only use the default REPOCONFIG if it's unset (e.g. verify_channel might have
 # set it to an empty string)
 REPOCONFIG="${REPOCONFIG-deb [arch=${ARCHITECTURE}] http://${BASEREPOCONFIG}}"
 # Allowed configs include optional HTTPS support and explicit multiarch
 # platforms.
 REPOCONFIGREGEX="deb (\\\\[arch=[^]]*\\\\b${ARCHITECTURE}\\\\b[^]]*\\\\]"
 REPOCONFIGREGEX+="[[:space:]]*) https?://${BASEREPOCONFIG}"
 stage_install_debian
 
 do_package