load_inventory pipeline does not work with SCIO JSON output

[JonoYang]

The load_inventory pipeline loads the JSON scan into a VirtualCodebase object, where the JSON scan data is mapped to a Codebase and Resource objects. VirtualCodebase requires that a root Resource be present in the scan in order for it to be created. When a Codebase is created from a scancode.io Project inputs, we strip the root from the paths of the Resources created, so the root Resource is not created. This is the main reason why the existing scan import code doesn't work.

A solution may be to have some functions that iterate through the JSON and create Packages and Resources as they appear in the scan and avoid using code that's specific to VirtualCodebase.

[tdruez]

A solution may be to have some functions that iterate through the JSON and create Packages and Resources as they appear in the scan and avoid using code that's specific to VirtualCodebase.

@JonoYang I've try an implementation based on your suggestion @ https://github.com/nexB/scancode.io/compare/609-load-inventory-scio
Can you give it a try? Feedback welcome ;)

[JonoYang]

@tdruez LGTM! I fetched your branch and I am able to load both scancode.io and scancode-toolkit scans using the load_inventory pipeline

[tdruez]

Added in #636