issue with keychain and updates from app store - iphone

Question

I am having a very frustrating error. I have tested for an app upgrade by first installing the previous version (1.0.1) and then running version (1.0.2). Everything worked fine. I submitted the app and then I am getting issues people are getting crashes when they upgrade. I tried doing the same thing, which is installing the 1.0.1 and then install the binary on the app store, then it crashed. I looked at the console and crash logs and I get this:
Jul 7 08:07:45 unknown MyApp[1429] <Warning>: KeychainUtils keychainValueForKey: - Error finding keychain value for key. Status code = -25300
Jul 7 08:07:45 unknown MyApp[1429] <Warning>: AccountSession readUserDataFromDisk - Error finding keychain value for key /var/mobile/Applications/997B32E7-6FFC-4696-9CAA-129BADE2FE64/Documents/instagram_json
Jul 7 08:07:45 unknown MyApp[1429] <Warning>: UISegmentedControlStyleBezeled is deprecated. Please use a different style.
Jul 7 08:07:45 unknown MyApp[1429] <Error>: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary setObject:forKey:]: attempt to insert nil value (key: username)'
*** First throw call stack:
(0x33ee688f 0x367e7259 0x33ee6789 0x33ee67ab 0x33e5368b 0x14fd99 0x152319 0x1530bb 0x170299 0x3270ec59 0x32711817 0x354e7dfb 0x354e7cd0)
Jul 7 08:07:45 unknown UIKitApplication:com.firesnakelabs.pinstagram[0x14e4][1429] <Notice>: terminate called throwing an exception
>
UPDATE:
I think I know what the issue is, on upgrade the filepath it was looking for is at:
/var/mobile/Applications/997B32E7-6FFC-4696-9CAA-129BADE2FE64/Documents/instagram_json
while before the upgrade (v1.0.1) the filepath of the keychain is at:
/var/mobile/Applications/CEE344F7-4FE1-4455-BD6D-A4D6EAA4F5FE/Documents/instagram_json
and hence it can't find the key on the keychain
now here's how I determine the filePath:
- (NSString *)filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:#"%#_json", self.identifier]];
return filePath;
}
I am just taking the first path that I found. So how do I make the path consistent before and after upgrade or all the time?
I am basically using the filePath as the keychain name:
[attributesDictionary setObject:filePath forKey:(id)kSecAttrAccount]; // Use the key as the account name

Answer 1

It's not entirely clear from your question, but it sounds like one of these builds is an ad hoc distributed build and the other an app store signed binary. If that's the case, the two will have different keychain values. The keychain is linked to the app's signing which differs between the two mechanisms.