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After many problems to codesign an Mac OSX app finally I got a working combination (what to sign, where it should be located).

My question is if there's some system command to do the exact same verification the system does on a downloaded app. I've used codesign --display and RB App Checker that passed the verification in some cases but when downloading the app didn't succeed.

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    How are you packaging your app? Zip? An installer? Some forms of packaging will corrupt the code signing. This may be why you see it failing after downloading. Commented Jan 8, 2015 at 21:22
  • Sorry for the vague question, it was a long day. I am packing on a dmg, I've made sure there are no changes in the packed app. Commented Jan 9, 2015 at 10:50

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You don't say what version of Mac OS X you develop under, or what version of Mac OS X you're downloading and testing on. That's important because there were changes in code signatures and GateKeeper in Mavericks and later.

See Apple's tech note for details, but what I use is:

spctl -a -v path/to/my.app
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Thank you! that's what I was looking for and in case of failure it gives a concies reason.

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