Before this fix if more than one retry happened on a file that rclone
had opened for read with a backend that uses fs.FixRangeOption then
rclone would read too much data and the transfer would fail.
Backends affected:
- azureblob, azurefiles, b2, box, dropbox, fichier, filefabric
- googlecloudstorage, hidrive, imagekit, jottacloud, koofr, netstorage
- onedrive, opendrive, oracleobjectstorage, pikpak, premiumizeme
- protondrive, qingstor, quatrix, s3, sharefile, sugarsync, swift
- uptobox, webdav, zoho
This was because rclone was emitting Range requests for the wrong data
range on the second and subsequent retries.
This was caused by fs.FixRangeOption modifying the options and the
reopen code relying on them not being modified.
This fix makes a copy of the fs.FixRangeOption in the reopen code to
fix the problem.
In future it might be best to change fs.FixRangeOption so it returns a
new options slice.
Fixes#7759
93955b755f