diff two xonotic release-like builds (untested)

misc/tools/xzipdiff

@@ -0,0 +1,52 @@
+#!/bin/sh
+
+from=$1
+to=$2
+output=$3
+case "$from" in /*) ;; *) from=`pwd`/$from ;; esac
+case "$to" in /*) ;; *) to=`pwd`/$to ;; esac
+case "$output" in /*) ;; *) output=`pwd`/$output ;; esac
+
+excludes="
+	data/xonotic-*-data.pk3
+	data/xonotic-*-maps.pk3
+	data/xonotic-*-music.pk3
+	data/xonotic-*-nexcompat.pk3
+"
+
+makepatchname()
+{
+	wildcard=$1
+	fromname=$2
+	toname=$3
+	prefix=${wildcard##*\*}
+	suffix=${wildcard%\**}
+	fromversion=${fromname#$prefix}
+	fromversion=${fromversion%$suffix}
+	toversion=${fromname#$prefix}
+	toversion=${fromversion%$suffix}
+	echo "$prefix$fromversion"patch"$toversion$suffix"
+}
+
+zipdiff -f "$from" -t "$to" -o "$output" -x "$excludes"
+
+tempdir=`mktemp -d -t zipdiff.XXXXXX`
+cd "$tempdir"
+
+for x in $excludes; do
+	mkdir a b c
+	(cd a && unzip "$from" "$x")
+	fromname=`find a/ -type f`; fromname=${fromname#a/}
+	(cd b && unzip "$to" "$x")
+	toname=`find b/ -type f`; toname=${toname#b/}
+	patchname=`makepatchname "$x" "$fromname" "$toname"`
+	patchdir="c/$patchname"; patchdir=${patchdir%/*}
+	mkdir -p "$patchdir"
+	zipdiff -f a/"$fromname" -t b/"$toname" -o c/"$patchname"
+	if [ -f c/"$patchname" ]; then
+		(cd c && zip -0r "$output" "$patchname")
+	fi
+	rm -rf a b c
+done
+
+rm -rf "$tempdir"

misc/tools/zipdiff

@@ -148,23 +148,25 @@ case "$output" in
 		;;
 	*)
 		rm -f "$output"
-		echo "$result" | while IFS= read -r line; do
+		if [ -n "$result" ]; then
-			echo >&2 "extracting $line..."
+			echo "$result" | while IFS= read -r line; do
-			dline=./$line
+				echo >&2 "extracting $line..."
-			mkdir -p "$tempdir/${dline%/*}"
+				dline=./$line
-			unzip -p "$to" "$line" > "$tempdir/$line" # this may create an empty file - don't care, DP handles this as deletion
+				mkdir -p "$tempdir/${dline%/*}"
-		done
+				unzip -p "$to" "$line" > "$tempdir/$line" # this may create an empty file - don't care, DP handles this as deletion
-		case "$output" in
+			done
-			/*)
+			case "$output" in
-				;;
+				/*)
-			*)
+					;;
-				output=`pwd`/$output
+				*)
-				;;
+					output=`pwd`/$output
-		esac
+					;;
-		cd "$tempdir"
+			esac
-		#zip -9r "$output" .
+			cd "$tempdir"
-		7za a -tzip -mx=9 "$output" .
+			#zip -9r "$output" .
-		cd ..
+			7za a -tzip -mx=9 "$output" .
+			cd ..
+		fi
 		;;
 esac