Exception: filename collision: when uploading remote-files with the same basename

[hoshimura]

I would like to see a change in how remote-files are saved locally, preferably using a checksum over the file content or similar.
I am uploading files from a remote where the basenames sometimes are the same and with the currently implementation of _download_data in cvat/apps/engine/task.py the upload fails with a filename collision even though the files themselves are different.
Using a checksum over the file would additionally allow reuse of the uploaded data over different tasks/jobs if desired.

[nmanovic]

It was already requested by another user to save such images with full url path or something like that (http://example.com/a/b/mypic.png -> /example.com/a/b/mypic.png). Probably we can provide a parameter into REST API to follow the approach.

[hoshimura]

Alright. Sounds like a way forward!