Add a reminder to ssh-add

[dryewo]

I tripped on this multiple times, without adding the key to SSH Agent ssh just says "Permission denied (public key)".

This additional message would have helped.

[aermakov-zalando]

Can you make it print the warning only if the SSH agent reports no installed keys? It should be easy to check with ssh-add -l.

[aermakov-zalando]

It might make sense to also print it as a warning.

[dryewo]

is it safe to assume that every computer has ssh-add installed?

[aermakov-zalando]

@dryewo you can just ignore it if it's not. but if it's installed and reports some keys, there's no point in printing the warning.

[coveralls]

Coverage increased (+0.5%) to 70.0% when pulling ba33c94 on dryewo:patch-1 into 117db8a on zalando-stups:master.

[aermakov-zalando]

👍

[dryewo]

👍