Optional path dependency cause poetry update to fail when the path is missing

[dg10a]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Arch Linux 5.5.4-arch1-1
• Poetry version: 1.0.3

Issue

After modifying the pyproject.toml file to include an optional path dependency, poetry update fails with the following error:

[ValueError]
Directory <Some path that doesn't exist on filesystem> does not exist

I would expect poetry to ignore the missing directory as the dependency is optional.

Might be related to #668

[AlexJoz]

yep, agree, would be very helpful to fix

[abn]

The issue with this is that when doing update or generating lock file all dependencies, including optional ones are required in order get a correct dependency tree. Avoiding this when resolving dependencies, could lead to other issues. It might be better to fail here. If a lock file already exists and the dependency is not activated (via extra etc.), this should not fail.

Re-using the existing package information from the lock file should mitigate this issue. We could, if data is available, treat this as a warning instead of an error.

[charlax]

I think you get the same error if you want to move a path dependency. Let's it was under /foo and move it + change pyproject.toml to point to /bar, poetry update will still fail with ValueError: Directory /foo does not exist (I'll try to reproduce later).

(seems definitely related to #668)

[finswimmer]

Duplicate of #668

[github-actions]

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