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bisync: fallback to cryptcheck or --download when can't check hash

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Bisync checks file equality before renaming sync conflicts by comparing
checksums. Before this change, backends without checksum support (notably
Crypt) would fall back to --size-only for these checks, which is not a very
safe method (differing files can sometimes have the same size, especially if
they're small.) After this change, Crypt remotes fallback to using Cryptcheck
so that checksums can be compared. As a last resort when neither Check nor
Cryptcheck are available, files are compared using --download so that we can be
certain the files are identical regardless of checksum support.
This commit is contained in:
nielash
2023-11-21 17:43:17 -05:00
parent 7f854acb05
commit 422b037087
7 changed files with 203 additions and 52 deletions
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docs/content/bisync.md
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@@ -1367,6 +1367,8 @@ for performance improvements and less [risk of error](https://forum.rclone.org/t
* Fixed handling of unicode normalization and case insensitivity, support for [`--fix-case`](/docs/#fix-case), [`--ignore-case-sync`](/docs/#ignore-case-sync), [`--no-unicode-normalization`](/docs/#no-unicode-normalization)
* `--resync` is now much more efficient (especially for users of `--create-empty-src-dirs`)
* Google Docs (and other files of unknown size) are now supported (with the same options as in `sync`)
* Equality checks before a sync conflict rename now fall back to `cryptcheck` (when possible) or `--download`,
instead of of `--size-only`, when `check` is not available.
### `v1.64`
* Fixed an [issue](https://forum.rclone.org/t/bisync-bugs-and-feature-requests/37636#:~:text=1.%20Dry%20runs%20are%20not%20completely%20dry)