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sync: --update/-u not transfer files that haven't changed - fixes #3232

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Before this change --update would transfer any file which was newer
than the destination regardless of whether it had changed or not.
This is needlessly wasteful of bandwidth.

After this change --update will only transfer files if they are newer
**and** they are different (checked with checksum and size).
This commit is contained in:
Nick Craig-Wood 2019-06-08 14:08:23 +01:00
parent 65a82fe77d
commit f3b0f8a9f0
3 changed files with 78 additions and 31 deletions
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@ -1098,9 +1098,18 @@ The default is to run 4 file transfers in parallel.
This forces rclone to skip any files which exist on the destination
and have a modified time that is newer than the source file.
This can be useful when transferring to a remote which doesn't support
mod times directly (or when using `--use-server-mod-time` to avoid extra
API calls) as it is more accurate than a `--size-only` check and faster
than using `--checksum`.
If an existing destination file has a modification time equal (within
the computed modify window precision) to the source file's, it will be
updated if the sizes are different.
updated if the sizes are different. If `--checksum` is set then
rclone will update the destination if the checksums differ too.
If an existing destination file is older than the source file then
it will be updated if the size or checksum differs from the source file.
On remotes which don't support mod time directly (or when using
`--use-server-mod-time`) the time checked will be the uploaded time.
@ -1108,11 +1117,6 @@ This means that if uploading to one of these remotes, rclone will skip
any files which exist on the destination and have an uploaded time that
is newer than the modification time of the source file.
This can be useful when transferring to a remote which doesn't support
mod times directly (or when using `--use-server-mod-time` to avoid extra
API calls) as it is more accurate than a `--size-only` check and faster
than using `--checksum`.
### --use-mmap ###
If this flag is set then rclone will use anonymous memory allocated by