It's all been said but to be clear ANY modern diesel will run quite happily on a 10-15% petrol diesel mix with no issues or long term damage. Some will run a substantially higher ratio mix.
You might even find the engine improved afterwards due to the stronger cleaning properties of petrol....
Just ask any forecourt cashier, many drivers of commercial diesels, london taxi's, landrovers etc. frequently lob a few litres of unleaded in on top of a full tank of diesel.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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