Change detection method for checking package name changes

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 105 matching lines @@
 # arm cross toolchain packages needed to build chrome on arm
 arm_list="libc6-armel-cross libc6-dev-armel-cross libgcc1-armel-cross
           libgomp1-armel-cross linux-libc-dev-armel-cross
           libgcc1-dbg-armel-cross libgomp1-dbg-armel-cross
           binutils-arm-linux-gnueabi cpp-arm-linux-gnueabi
           gcc-arm-linux-gnueabi g++-arm-linux-gnueabi
           libmudflap0-dbg-armel-cross"
 
 
 # Some package names have changed over time
-if apt-cache show ttf-mscorefonts-installer >/dev/null 2>&1; then
+if ! ( apt-cache policy ttf-mscorefonts-installer
+    | grep "Candidate: (none)" >/dev/null 2>&1 ); then

[Lambros, 2013/05/28 18:26:58]

I don't know if this will work for non-English locales.

Have a look in /etc/bash-completion.d/apt and see how they test for available
package names. For example, the apt-cache "pkgnames" option looks promising.

Also, consider encapsulating the test into a Bash function, instead of repeating
the code 5 times.

   dev_list="${dev_list} ttf-mscorefonts-installer"
 else
   dev_list="${dev_list} msttcorefonts"
 fi
-if apt-cache show libnspr4-dbg >/dev/null 2>&1; then
+if ! ( apt-cache policy libnspr4-dbg
+    | grep "Candidate: (none)" >/dev/null 2>&1 ); then
   dbg_list="${dbg_list} libnspr4-dbg libnss3-dbg"
   lib_list="${lib_list} libnspr4 libnss3"
 else
   dbg_list="${dbg_list} libnspr4-0d-dbg libnss3-1d-dbg"
   lib_list="${lib_list} libnspr4-0d libnss3-1d"
 fi
-if apt-cache show libjpeg-dev >/dev/null 2>&1; then
+if ! ( apt-cache policy libjpeg-dev
+    | grep "Candidate: (none)" >/dev/null 2>&1 ); then
   dev_list="${dev_list} libjpeg-dev"
 else
   dev_list="${dev_list} libjpeg62-dev"
 fi
-if apt-cache show libudev1 >/dev/null 2>&1; then
+if ! ( apt-cache policy libudev1
+    | grep "Candidate: (none)" >/dev/null 2>&1 ); then
   dev_list="${dev_list} libudev1"
 else
   dev_list="${dev_list} libudev0"
 fi
 
 
 # Some packages are only needed, if the distribution actually supports
 # installing them.
-if apt-cache show appmenu-gtk >/dev/null 2>&1; then
+if ! ( apt-cache policy appmenu-gtk
+    | grep "Candidate: (none)" >/dev/null 2>&1 ); 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() {
@@ skipping 332 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