问题
When I run stack upload I get an error:
Environment variable GPG_TTY is not set (see man gpg-agent)
Unable to find gpg2 or gpg executable
The upload appears to succeed, but the error concerns me.
What are the consequences of this error? Is there a way to avoid to suppress it?
回答1:
As per discussion in the comments the errors are due to stack trying to automatically GPG sign packages that are being uploaded as of version 1.1.0.
To my understanding this is a stack-specific feature (with no package signing built into cabal or hackage), and it can be disabled with --no-signature command line option to stack upload.
来源：https://stackoverflow.com/questions/41415900/gpg-error-when-using-stack-upload