Girder client always redownloads?

[Erotemic]

I just tested this following usage of girder-client:

girder-client --api-url https://data.kitware.com/api/v1 download 602586be2fa25629b9635f39
girder-client --api-url https://data.kitware.com/api/v1 download 602586be2fa25629b9635f39
girder-client --api-url https://data.kitware.com/api/v1 download 602586be2fa25629b9635f39

Each time it seemed to re-download the file.

It would be useful if there was an option to have it skip downloading the contents of any file path that already existed.

This is related to the use case where I'm managing data via DVC, which moves any managed files into a shared cache directory and then replaces the original files with symlinks and write protects them. The folder I'm managing was updated on girder and I want to download all the new files. However, its erroring because its trying to overwrite existing symlinks that DVC has write protected.

EDIT:
I would have made a PR to fix this, but there seems to be some magic happening with a cache, and I wanted to get feedback from core devs before I did anything. I might be asking a silly question.

[zachmullen]

FYI @danlamanna