Improve DU download

[mubaidr]

This pull request adds

• proxy support for user environment proxy configuration.
• checks if exe already downloaded then skip download

[simoneb]

Thanks for the PR, but I'm not too keen to go ahead with the current implementation because it feels very tied to your specific environment, so ideally I would like to come up with something more generic.

First of all let me ask this question: in the issue you commented that you needed to be able to use a local file system path, so I would like to understand if the requirement changed now.

[mubaidr]

Can you explain what do you mean by tied to specific environment?

For what I understand, anyone using system wide proxy server, it is recommended or optimal way to set environmental variables. AFAIK

First of all let me ask this question: in the issue you commented that you needed to be able to use a local file system path, so I would like to understand if the requirement changed now.

Requirements still exists.

[simoneb]

I'm not sure why you closed this, I think the request makes sense, I just wanted to come up with a more generic way to handle this

[mubaidr]

Please share idea, I will open new pull request.

[simoneb]

If your requirement is to be able to load the file from the file system, can't we just handle it in the existing environment variable and, if it's a url, download it, otherwise copy the file from the file system to the expected location (or even just use it as-is)?

[mubaidr]

These are two different requirements:

• To be able to specify already downloaded file (file:// protocol) and yes, this will be handled by the existing environment variable i.e. FAST_FOLDER_SIZE_DU_ZIP_LOCATION
• To be able to use this tool behind proxy servers. We need to read proxy settings from user environment variables.

Sorry for the confusion

[simoneb]

Okay fair enough. I'm happy to get a PR which does either or both. When possible, please consider including unit tests to check that this works