Show obvious error message if no working ssh key available

% gist edit c17592d5ef054e634c7dbe48be0c186f
Cloning into 'c17592d5ef054e634c7dbe48be0c186f'...
Warning: Permanently added the RSA host key for IP address '192.30.253.119' to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
1519185641.230 ERROR[gist] [Errno 2] No such file or directory: 'c17592d5ef054e634c7dbe48be0c186f

gist list works perfectly

I have access rights gist, notifications, repo for my token

[jdowner]

I created a new token for testing with the same permissions you had. I created a new VM for testing and installed gist. Like you, I was able to list the gists, but when I tried to edit a gist (which involves cloning the repo), I got the same error as you.

I created a new ssh key for the VM and added it to my github account. After that I was able to edit the gists.

The confusing thing here is that you can list all of your gists, but you cannot edit them. This seems inconsistent. The reason this occurs is that listing the gists goes through the github API and, therefore, access is determined by the token. But editing/cloning the gists is done via git, so it has nothing to do with the access token.

Originally, access tokens did not expose the different scopes that are now available. One of the scopes that is now available is to read the users public keys. This may provide a mechanism for detecting this kind of problem from within gist so that the user can, at least, be provided a more helpful message.

[d9k]

@jdowner, cool, this works! Many thanks!