[tools] ipkg-utils: don't fail if conffiles do not exist, resolve them instead and silently skip not existing files.

This prepares support for sysupgrade hints using to build the keepfile list.
Subsequent commits will rely on this feature - a rebuild of tools/ipkg-utils is necessary!


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23256 3c298f89-4303-0410-b956-a3cf2f4a3e73

tools/ipkg-utils/patches/170-resolve_conffiles.patch

@@ -0,0 +1,23 @@
+--- a/ipkg-build
++++ b/ipkg-build
+@@ -160,12 +160,15 @@ You probably want to chown these to a sy
+ 	done
+ 
+ 	if [ -f $CONTROL/conffiles ]; then
+-		for cf in `cat $CONTROL/conffiles`; do
+-			if [ ! -f ./$cf ]; then
+-				echo "*** Error: $CONTROL/conffiles mentions conffile $cf which does not exist" >&2
+-				PKG_ERROR=1
+-			fi
++		rm -f $CONTROL/conffiles.resolved
++
++		for cf in `$FIND $(sed -e "s!^/!$pkg_dir/!" $CONTROL/conffiles) -type f`; do
++			echo "${cf#$pkg_dir}" >> $CONTROL/conffiles.resolved
+ 		done
++
++		rm $CONTROL/conffiles
++		mv $CONTROL/conffiles.resolved $CONTROL/conffiles
++		chmod 0644 $CONTROL/conffiles
+ 	fi
+ 
+ 	cd $owd