4 Commits (7aa766ee65f024af2df2499a350c0a88b2a1399d)

Author	SHA1	Message	Date
Joe Tsai	975c5f7684	taildrop: lazily perform full deletion scan after first taildrop use (#10137) ... Simply reading the taildrop directory can pop up security dialogs on platforms like macOS. Avoid this by only performing garbage collection of partial and deleted files after the first received taildrop file, which would have prompted the security dialog window. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	6ada33db77	taildrop: fix theoretical race condition in fileDeleter.Init (#9876) ... It is possible that upon a cold-start, we enqueue a partial file for deletion that is resumed shortly after startup. If the file transfer happens to last longer than deleteDelay, we will delete the partial file, which is unfortunate. The client spent a long time uploading a file, only for it to be accidentally deleted. It's a very rare race, but also a frustrating one if it happens to manifest. Fix the code to only delete partial files that do not have an active puts against it. We also fix a minor bug in ResumeReader where we read b[:blockSize] instead of b[:cs.Size]. The former is the fixed size of 64KiB, while the latter is usually 64KiB, but may be less for the last block. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	a8fbe284b2	taildrop: fix theoretical race condition (#9866) ... WaitGroup.Wait should not be concurrently called WaitGroup.Add. In other words, we should not start new goroutines after shutodwn is called. Thus, add a conditional to check that shutdown has not been called before starting off a new waitAndDelete goroutine. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	c2a551469c	taildrop: implement asynchronous file deletion (#9844) ... File resumption requires keeping partial files around for some time, but we must still eventually delete them if never resumed. Thus, we implement asynchronous file deletion, which could spawn a background goroutine to delete the files. We also use the same mechanism for deleting files on Windows, where a file can't be deleted if there is still an open file handle. We can enqueue those with the asynchronous file deleter as well. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago