Trying to snap a directory that doesn't exist prints [Errno 2]

[Leo Arias]

To reproduce:

$ snapcraft snap idontexist
[Errno 2] No such file or directory: '/tmp/test/idontexist/meta/snap.yaml'

It shouldn't show Errno 2.

[Simon Quigley (tsimonq2)]

Leo, are you saying the error should look like this?

$ snapcraft snap idontexist
No such file or directory: '/tmp/test/idontexist/meta/snap.yaml'

If not, could you be more specific?

[Leo Arias (elopio)]

we still need to define all the error messages that we want to show, but yes, something like that.

[Kyle Fazzari (kyrofa)]

I have mixed feelings about this one. This isn't a snapcraft-specific error, it's a FileNotFoundError.

[Kyle Fazzari (kyrofa)]

Rather than just removing the errno, I say we check to see if the file exists, and then show a snapcraft-specific error. First, if the directory doesn't exist, say so. Then, if the meta/snap.yaml file doesn't exist, say something like "this directory is missing snap metadata" or something similar.