Bundle Unpacking Logic Fails With Tk-multi-setframerange

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Introduction

The Shotgun Toolkit is a powerful tool for automating tasks and workflows in the film and television industry. However, like any complex system, it can sometimes encounter issues that need to be addressed. One such issue is the bundle unpacking logic failing with the tk-multi-setframerange package. In this article, we will delve into the details of this issue and explore a suggested fix.

The Problem

The issue arises when the toolkit bundle zip has only a single folder. In this case, the bundle unpacks that folder as the bundle, rather than the root of the zip. This may seem like a minor issue, but it can have significant consequences for packages like tk-multi-setframerange, which rely on the correct unpacking of their dependencies.

The Current Implementation

The current implementation of the bundle unpacking logic can be found in the zip.py file of the tk-core repository. Specifically, the relevant code snippet is as follows:

def _unzip_bundle(zip_file):
    # ...
    if len(zip_file.namelist()) == 1:
        # If there's only one item in the zip, it's likely a folder
        # and we should extract it as is
        return _unzip_folder(zip_file)
    # ...

As we can see, the code checks if there's only one item in the zip file, and if so, it assumes that it's a folder and extracts it as is. This approach works for most packages, but it's not sufficient for packages like tk-multi-setframerange, which require the root of the zip to be unpacked.

The Issue with tk-multi-setframerange

The issue with tk-multi-setframerange is that it relies on the correct unpacking of its dependencies. When the bundle unpacking logic fails and only the hooks folder is unpacked, the package is unable to function correctly. This can lead to a range of issues, from errors and warnings to complete failure of the package.

Suggested Fix

To address this issue, we suggest two possible fixes:

  1. Check for info.yml in the root folder: A clear indication of a Shotgun Toolkit bundle is the presence of an info.yml file in the root folder. We can modify the bundle unpacking logic to check for this file and, if present, extract the root of the zip as the bundle.
  2. Check that if there is only a single folder, that there are no files in the root folder: Another possible fix is to check that if there is only a single folder, there are no files in the root folder. If there are no files, it's likely that the single folder is the root of the zip, and we should extract it as is.

Implementation

To implement these fixes, we can modify the zip.py file as follows:

def _unzip_bundle(zip_file):
    # ...
    if len(zip_file.namelist()) == 1:
        # Check if there's an info.yml file in the root folder
        if 'info.yml' in zip_file.namelist():
            # If there is, extract the root of the zip as the bundle
            return _unzip_root(zip_file)
        else:
            # Check if there are any files in the root folder
            if len([f for f in zip_file.namelist() if f.endswith('/')]) == 0:
                # If there are no files, extract the single folder as the bundle
                return _unzip_folder(zip_file)
    # ...

Conclusion

In conclusion, the bundle unpacking logic failing with tk-multi-setframerange is a significant issue that can have far-reaching consequences. By modifying the bundle unpacking logic to check for the presence of an info.yml file in the root folder or to check that if there is only a single folder, there are no files in the root folder, we can ensure that the package is unpacked correctly and functions as intended.

Future Work

Future work on this issue could involve further testing and validation of the modified bundle unpacking logic. Additionally, we could explore other possible fixes, such as modifying the info.yml file to include a specific field that indicates the root of the zip.

References

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Introduction

In our previous article, we explored the issue of the bundle unpacking logic failing with the tk-multi-setframerange package. We also suggested two possible fixes to address this issue. In this article, we will provide a Q&A section to help clarify any doubts or questions you may have about this issue.

Q: What is the bundle unpacking logic, and why is it important?

A: The bundle unpacking logic is a process that extracts the contents of a zip file into a specific directory. It's an important part of the Shotgun Toolkit, as it allows packages to be installed and configured correctly. When the bundle unpacking logic fails, it can lead to issues with package functionality and overall system stability.

Q: What causes the bundle unpacking logic to fail with tk-multi-setframerange?

A: The bundle unpacking logic fails with tk-multi-setframerange because the zip file contains only a single folder, and the current implementation assumes that this folder is the root of the zip. However, in the case of tk-multi-setframerange, the single folder is actually a subfolder, and the root of the zip contains other files and folders.

Q: What are the two possible fixes suggested to address this issue?

A: The two possible fixes suggested to address this issue are:

  1. Check for info.yml in the root folder: A clear indication of a Shotgun Toolkit bundle is the presence of an info.yml file in the root folder. We can modify the bundle unpacking logic to check for this file and, if present, extract the root of the zip as the bundle.
  2. Check that if there is only a single folder, that there are no files in the root folder: Another possible fix is to check that if there is only a single folder, there are no files in the root folder. If there are no files, it's likely that the single folder is the root of the zip, and we should extract it as is.

Q: How can I implement these fixes in my code?

A: To implement these fixes, you can modify the zip.py file to include the following code:

def _unzip_bundle(zip_file):
    # ...
    if len(zip_file.namelist()) == 1:
        # Check if there's an info.yml file in the root folder
        if 'info.yml' in zip_file.namelist():
            # If there is, extract the root of the zip as the bundle
            return _unzip_root(zip_file)
        else:
            # Check if there are any files in the root folder
            if len([f for f in zip_file.namelist() if f.endswith('/')]) == 0:
                # If there are no files, extract the single folder as the bundle
                return _unzip_folder(zip_file)
    # ...

Q: What are the benefits of implementing these fixes?

A: Implementing these fixes will ensure that the bundle unpacking logic functions correctly, even when the zip file contains only a single folder. This will prevent issues with package functionality and overall system stability.

Q: Are there any potential drawbacks to implementing these fixes?

A: One potential drawback to implementing these fixes is that they may introduce additional complexity to the bundle unpacking logic. However, this complexity is necessary to ensure that the logic functions correctly in all scenarios.

Q: How can I test these fixes to ensure they work correctly?

A: To test these fixes, you can create a test zip file that contains a single folder and no files in the root folder. You can then use the modified bundle unpacking logic to extract the contents of the zip file and verify that it functions correctly.

Conclusion

In conclusion, the bundle unpacking logic failing with tk-multi-setframerange is a significant issue that can have far-reaching consequences. By implementing the suggested fixes, you can ensure that the bundle unpacking logic functions correctly and prevents issues with package functionality and overall system stability.