Allow installation in a path with whitespaces (#19609)

cataclysm-launcher

@@ -4,8 +4,8 @@ TARGET_FILE=$0
 cd `dirname $TARGET_FILE`
 TARGET_FILE=`basename $TARGET_FILE`
 
-# Iterate down a (possible) chain of symlinks
-while [ -L $TARGET_FILE ]
+# Iterate down a (possible) chain of symlinks.
+while [ -L "$TARGET_FILE" ]
 do
     TARGET_FILE=`readlink $TARGET_FILE`
     cd `dirname $TARGET_FILE`
@@ -14,23 +14,23 @@ done
 
 # Find the physical path and name of target file.
 DIR=`pwd -P`
-BIN=$(basename $0)
+BIN=`basename $0`
 
-cd $DIR || exit $?
+cd "$DIR" || exit $?
 
 # If name does not match a binary or is this same script, find the right one
-if [ ! -f $BIN ] || [ $BIN = "cataclysm-launcher" ]
+if [ ! -f "$BIN" ] || [ "$BIN" = "cataclysm-launcher" ]
 then
     BIN=
     for bin in cataclysm-tiles cataclysm
     do
-	[ -f $bin ] && BIN=$bin && break
+	[ -f "$bin" ] && BIN="$bin" && break
     done
 fi
 
-if [ $BIN ]
+if [ "$BIN" ]
 then
-    exec ./$BIN
+    exec "./$BIN"
 else
     echo "Couldn't find cataclysm game binary in $DIR/"
     exit 1