Hello! There seems to be a bug in the sign_buffer_ssh function in gpg-interface.c: a possible exit code of ssh-keygen is 255, which is returned as-is by sign_buffer_ssh. The problem is that, for example, the function build_tag_object in builtin/tag.c considers only negative values as a failure. Since 255 >= 0, the error message "unable to sign the tag" is not emitted and git exits normally with zero exit code. It might be enough to return -1 in sign_buffer_ssh if ret is not zero. I am sorry if this has already been reported or taken care of. Thank you. Best regards, Sergey
