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said that attack on Iran will mean attack on Pakistan.
Now you are reading too much and relying on your wishfull thinking...
Anyway, so far the official statements from the Pak government is that Pakistan is for diplomatic solution of Iran's nuclear issue and incase a war happens, Pakistan will play neutral. Pakistan will not allow anyway US to use its teritory for war. But to the matter of fact, US does not need Pakistan teritory rather it will use aircraft carriers based in the Gulf for airstirkes on Iran, a total invasion is not very likely.
But in my oinion US will not call the first shot rather Israel AF will do the dirty job and if Iran try to hit back on Israel or US installations present in Gulf/Iraq/Afganistan than US will come to the game to knock off Iran's what ever military capabilities. Even in this scenario total invasion is very less likely.
I am also against war on Iran but if war heppens, it will have tremendous boost for Gwader port indeed.