Specify Cache Directory in Azure DevOps in Lambda Function Setup

[koid]

PR Type:

Documentation

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PR Description:

This PR updates the documentation to include an additional step in the Lambda function setup process. The new step instructs users to specify the AZURE_DEVOPS_CACHE_DIR environment variable in the Lambda function to a writable location such as /tmp. This change is in response to issue #443.

---

PR Main Files Walkthrough:

files:

• INSTALL.md: Added a new step in the Lambda function setup process instructing users to specify the AZURE_DEVOPS_CACHE_DIR environment variable to a writable location. The step numbering was also updated accordingly.

[koid]

/describe

[barnett-yuxiang]

May I ask, in general programming habits, the constant string is written in index or defined externally, how to make decisions?

[koid]

Thank you for the question.

I also believe that it should be defined externally.
On the other hand, I am uncertain whether it is appropriate to define this issue in configuration.toml as a global application setting, considering that it is a serverless-specific problem.

I think there are other ways as well:

• Add instructions to the Installation Guide to set AWS Lambda environment variables (without modifying the code.)
• Define it in Dockerfile.lambda as an ARG with default values (allowing override with build args).

Which method would be appropriate?

[barnett-yuxiang]

Thank you for the question.

I also believe that it should be defined externally. On the other hand, I am uncertain whether it is appropriate to define this issue in configuration.toml as a global application setting, considering that it is a serverless-specific problem.

I think there are other ways as well:

• Add instructions to the Installation Guide to set AWS Lambda environment variables (without modifying the code.)
• Define it in Dockerfile.lambda as an ARG with default values (allowing override with build args).

Which method would be appropriate?

Personally, I agree with the first one, but you can also listen to the owner. Does pr-agent have a division of owner CR?

[koid]

Thank you, I'll limit the updates to the Installation Guide for now.

[koid]

/describe

[mrT23]

/review

[github-actions]

PR Analysis

• 🎯 Main theme: Update documentation to specify cache directory in Azure DevOps in Lambda function setup
• 📝 PR summary: This PR updates the documentation to include an additional step in the Lambda function setup process. The new step instructs users to specify the AZURE_DEVOPS_CACHE_DIR environment variable in the Lambda function to a writable location such as /tmp.
• 📌 Type of PR: Documentation
• 🧪 Relevant tests added: No
• ⏱️ Estimated effort to review [1-5]: 1, because the PR only includes a minor documentation change and does not involve any code modifications.
• 🔒 Security concerns: No

PR Feedback

• 💡 General suggestions: The PR is straightforward and clear. It provides a necessary update to the documentation, ensuring users specify the AZURE_DEVOPS_CACHE_DIR environment variable in the Lambda function setup. This will help users avoid potential issues in the future.

• 🤖 Code feedback:

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[barnett-yuxiang]

@mrT23 Excuse me, may I ask how your Git Action above triggers PR Analysis work?

🌹

[mrT23]

@mrT23 Excuse me, may I ask how your Git Action above triggers PR Analysis work?

🌹

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[mrT23]

@koid
i dont understand this PR.
how 'AZURE_DEVOPS_CACHE_DIR` is related to lambda function deployed on AWS ?

[mrT23]

@koid is this PR alive, or should I close it ?

i repeat my question - how 'AZURE_DEVOPS_CACHE_DIR` is related to lambda function deployed on AWS ?

[koid]

I'm sorry, I noticed the mention late.

In azure-devops, if the cache directory is not explicitly specified, it will be created under the home directory of the executing user.

In the case of AWS Lambda, the executing user does not have write permissions for the home directory, leading to a failure in creating the cache directory.

To address this issue, instructions on specifying a path where the executing user has write permissions as the cache directory are added to the README.

[mrT23]

@koid
I still dont understand this PR.
How AZURE_DEVOPS_CACHE_DIR is related to AWS lambda ?

Maybe it is a very specific use case, but it is not a general instruction for any AWS lambda .

Share a more logical and coherent instruction in order for it to be merged

[koid]

This is not a specific use case but a common limitation in Lambda.

https://docs.aws.amazon.com/lambda/latest/dg/images-create.html#images-reqs

The container image must be able to run on a read-only file system. Your function code can access a writable /tmp directory with between 512 MB and 10,240 MB, in 1-MB increments, of storage.

As a prerequisite, in AWS Lambda, writable directories are restricted to those under /tmp. (Directories other than /tmp are treated as read-only.)

The pr-agent supports Azure DevOps as a git provider, but the Azure DevOps library requires write permissions to local storage for caching purposes.

When importing azure.devops.connection.Connection, the Connection class attempts to create a Cache directory. If the Cache directory is not in a writable area, an issue error will occur.

https://github.com/microsoft/azure-devops-python-api/blob/7.1.0b3/azure-devops/azure/devops/connection.py#L9
https://github.com/microsoft/azure-devops-python-api/blob/7.1.0b3/azure-devops/azure/devops/_file_cache.py#L114-L115

If the import of the Connection is done within the AzureDevopsProvider class, it is possible to avoid errors when not using the Azure DevOps provider. However, since the import is done outside the AzureDevopsProvider class, errors will still occur even if the Azure DevOps provider is not being used.

pr-agent/pr_agent/git_providers/azuredevops_provider.py

Line 12 in fe79624

from azure.devops.connection import Connection

pr-agent/pr_agent/git_providers/__init__.py

Line 8 in fe79624

from pr_agent.git_providers.azuredevops_provider import AzureDevopsProvider

To avoid this, you need to specify AZURE_DEVOPS_CACHE_DIR to a writable directory (or you can specify it to /tmp, which is a writable directory under HOME) as a workaround.

--

Perhaps, in terms of chronology, Lambda support was added first (#92), followed by the Azure DevOps Provider support (#265), which might explain why the Lambda specifications were not taken into consideration during #265.

[mrT23]

@koid
thanks for the detailed explanation

i will add a link to that explanation in the readme, since without it, it won't be clear how the things are connected