collect-installed-pkg-changes.sh: Collect-installed-pkg-changes.sh some improvements

- Usage message
- Target option
- Only copying files differing from local directory

Signed-off-by: Jan Lindemann <jan@janware.com>

scripts/collect-installed-pkg-changes.sh

@@ -21,6 +21,36 @@ lp()
 	find . -name "$1" | grep -v "/dist/\|/include/"
 }
 
+usage()
+{
+	echo "$myname [-h] [-t target-dir ] [ package-name ]"
+	[ "$1" ] && exit $1
+}
+
+# -- here we go
+
+set -- `getopt 'ht:' $*`
+while [ "$1" != -- ]; do
+	case "$1" in
+	-h)
+		usage 0
+		;;
+	-t)
+		target="$2"
+		shift
+		;;
+	*)
+		usage 1
+		;;
+	esac
+	shift
+done
+shift
+
+[ "$target" ] && {
+	cd $target || fatal "failed to change to target dir \"$target\""
+}
+
 proj=$1
 [ "$proj" ] || {
 	proj=`pwd | xargs basename`
@@ -47,6 +77,9 @@ for p in $changed_paths; do
 		lp $b
 		fatal exiting
 	}
+	diff -q $lp $p >/dev/null 2>&1 && {
+		continue
+	}
 	log copying $p $lp
 	cp $p $lp
 done