credential.SetMachine and oracle's writeProviderBlock read, modify and rename ~/.abcd/credentials.json and ~/.abcd/config.json with no lock, so concurrent ahoy connect runs lose a key or a provider block while each reports it wrote the file.

credential.SetMachine and oracle's writeProviderBlock read, modify and rename ~/.abcd/credentials.json and ~/.abcd/config.json with no lock, so concurrent ahoy connect runs lose a key or a provider block while each reports it wrote the file.

Grounds

• pursued: concurrent ahoy connect runs keep every key and every block, and exactly one of several setups of one provider succeeds; shown wrong by a writer of either file that does not take its lock, or by TestConcurrentConnectsKeepEveryKeyAndBlock or TestConcurrentSetsKeepEveryEntry losing an entry