from rsync manual:
--compare-dest=DIR
This option instructs rsync to use DIR on the destination machine as an
additional hierarchy to compare destination files against doing transfers
(if the files are missing in the destination directory). If a file is found
in DIR that is identical to the sender's file, the file will NOT be
transferred to the destination directory. This is useful for creating
a sparse backup of just files that have changed from an earlier backup.
--copy-dest=DIR
This option behaves like --compare-dest, but rsync will also copy unchanged
files found in DIR to the destination directory using a local copy.
This is useful for doing transfers to a new destination while leaving
existing files intact, and then doing a flash-cutover when all files
have been successfully transferred.
Before this change the race tests were taking too long. The bcrypt
function went from about 20ms to 1s under the race detector and this
is called for every transaction on webdav.
This change reduces the bcrypt strength so it takes 1ms non race so
the race tests pass and still has adequate security for in memory only
storage.
This makes ReadAt for non cached files wait a short time (up to 5mS)
if it gets an out of order read (which would normally cause a seek and
which take a long time) to see if the gap will be filled with an in
order read.
This makes mount2 based on go-fuse work more efficiently and enables
async reading in normal mount.
A similar change was done for WriteAt in af030f74f5
We attempt to find the ID of the root folder by doing a GET on the
folder ID "root". With scope "drive.files" this fails with a 404
message.
After this change if we get the 404 message, we just carry on using
"root" as the root folder ID and we cache that for future lookups.
This means that changenotify messages will not work correctly in the
root folder but otherwise has minor consequences.
See: https://forum.rclone.org/t/fresh-raspberry-pi-build-google-drive-404-error-failed-to-ls-googleapi-error-404-file-not-found/12791
Before this change rclone would allow the user to stream (eg with
rclone mount, rclone rcat or uploading google photos or docs) 5TB
files. This meant that rclone allocated 4 * 525 MB buffers per
transfer which is way too much memory by default.
This change makes rclone use the configured chunk size for streamed
uploads. This is 5MB by default which means that rclone can stream
upload files up to 48GB by default staying below the 10,000 chunks
limit.
This can be increased with --s3-chunk-size if necessary.
If rclone detects that a file is being streamed to s3 it will make a
single NOTICE level log stating the limitation.
This fixes the enormous memory usage.
Fixes#3568
See: https://forum.rclone.org/t/how-much-memory-does-rclone-need/12743
On google fs (drive, google photos, and google cloud storage), if
headless is selected, do not open browser.
This also supplies a new option "auth-no-open-browser" for authorize
if the user does not want it.
This should fix#3323.
