Does rclone create any tmp files (when copying from http to s3)?

[stefan_Esterer]

I have a general question about the internal working of rclone. I didn't find a definite answer in the documentation or via the forum search.

I have a aws s3 remote and a file accessible via http. What happens if I copy the http file to s3 via the rclone copy command?

Does rclone download the whole file and store it into a tmp file and uploads it afterwards? If yes: Does it create a temp file?
Or is rclone streaming the http file without ever having the whole source file in memory or on disk?
(Additionally: Is this rclone behavior source and remote specific?)

I also tried to find out it's inner working with lsof and friends but failed to find a definite answer. It would be great if someone can answer this question or give me a hint where to find it online..

Thx for your help and great work!
Stefan

[Harry]

@stefan_Esterer

Does rclone download the whole file and store it into a tmp file and uploads it afterwards? If yes: Does it create a temp file?
Or is rclone streaming the http file without ever having the whole source file in memory or on disk?
(Additionally: Is this rclone behavior source and remote specific?)

Rclone does not create any temp files while copying from one remote to other. It downloads chunks of a file and store it to memory and upload to the other remote.