Atlantis is unable to destroy deleted projects

[chrisob]

Desired behavior
On first glance, I would expect that Atlantis is able to plan/apply a destroy for an entire project if the project files have been deleted in a PR.

Actual behavior
Atlantis is not able to destroy a project which was deleted due to the missing project directory.

Version
v0.15.0

Steps to reproduce

On master branch:

1. Create a project in the dir myproject which defines some Terraform resources
2. Configure autoplanner when_modified pointing to myproject in atlantis.yml
3. Deploy myproject manually or via atlantis in a PR which is already merged to master (in other words, make sure resources exist and are in remote TF state)

In a PR/feature branch not yet merged to master:

1. Delete entire myproject dir, commit & push to PR's feature branch

2. atlantis plan says "0 projects are to be planned" even though myproject resources have been deleted

3. atlantis logs say:

   2020/09/07 16:53:59+0000 [DBUG] project_finder.go:135 chrisob/my-repo#3: Project at dir "myproject" not included because dir does not exist
   

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I'm guessing that Atlantis only looks at the feature branch's tree to discover project info/remote state, so if the project dir no longer exists on the feature branch, then Atlantis wouldn't be able to plan against a remote state, which would explain this issue.

That being said, Atlantis is able to manage destruction of individual resources inside a project, so I'd hoped it would be possible to also delete entire projects.

Is this possible without a large refactor to do a comparison using the base branch's remote state?

[lkysow]

Hi, I think this is a duplicate of #941?

Is this possible without a large refactor to do a comparison using the base branch's remote state?

We might be able to detect a directory being deleted from the list of modified files but the large piece of work would then be cloning the base branch and running terraform destroy in that directory. Right now Atlantis always clones the PR branch.

Please direct further discussion onto the original issue.