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For every pull request we perform a lock when the pull request is opened and unlocked when the pull request is merged, this is to avoid making a single apply override another apply in a different PR. Since digger is primarily being used to apply while the PR is open this locking guarantees that no two PRs can wipe off eachother’s changes due to human errors. When digger is using with a backend the locks are stored in the database directly in a table called digger_locks. No further configuration is needed.

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Disabling PR-level locks

In order to disable locking repo wide you can add a top-level flag to your digger.yml: 
pr_locks: false

projects:
   - name: dev
     dir: dev/

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Backendless mode

When using digger in backendless mode there is no backend or DB to store the locks information. In this case we have implemented integrations with several cloud provider resources to store the state of PR locks. The table below summarises the different locking methods available when using backendless mode:
Cloud ProviderResource TypeConfiguration details Link
AWSDynamoDBhere
GCPGCP Buckethere
AzureStorage Tableshere