On kqueue-systems, folders listen for folder summaries to (be able to)
warn for potential high resource usage. However, it listened for any
folder summary and not for the summary which matches the folder it's
about. This could cause that an unwatched folder causes a folder summary
containing more files than the threshold (10k), and the listening folder
(with the watcher enabled) triggers the warning.
This makes sure that only the folder summaries which are relevant to the
specific folder are being handled.
### Testing
- Fire up some kqueue-system (freebsd, I used).
- add folder A, disable the watcher, add 10001 files
- add folder B with the watcher enabled, no files are needed here
Before the change:
- add an item to folder A, trigger a rescan to speed up the process
- wait some seconds...warning triggered by folder B's
summarySubscription
After the change:
- Only a warning is triggered if the received folder summary matches the
folder which listens for the summaries
### Purpose
Deduplicated files are apparently considered 'irregular' under the hood,
this causes them to simply be ignored by Syncthing. This change is more
of a workaround than a proper fix, as the fix should probably happen in
the underlying libraries? - which may take some time. In the meanwhile,
this change should make deduplicated files be treated as regular files
and be indexed and synced as they should.
### Testing
Create some volume where deduplication is turned on (see the relevant
issue for details, including a proper description of how to reproduce
it). Prior to this change, the deduplicated files were simply ignored
(even by the indexer). After this change, the deduplicated files are
being index and synced properly.
In the sequence of loading ignores, the error File Does Not Exist is not being considered a fatal error, since the .stignore file is allowed to not exist. However, included ignore files also tossed that same error in case those do not exist while in those cases it's considered an error and it should lead to the folder stopping. Changing the error when opening an included ignore file to something other than the regular does fix this issue, as in it now works again as described in the Documentation.
There are some situations where an upgrade wouldn't be supported, even though the noUpgrade bool isn't set. So when handling the errors that are caused by this, when attempting an upgrade, it shouldn't lead to some sort of offline-message/restart/warning/etc...
I added some checks on specific errors related to this and return a 501 (Not Implemented) response instead, in case of an "UpgradeUnsupported"-error. Additionally, on the GUI-side, the 501-response is now not to be considered an error to act upon.
The restore function of Trash Can ran a rename at the end regardless of whether there was anything to rename. In this case, when the file-to-be-restored did not exist in the destination folder, this resulted in an error. I added a simple check, keeping track of whether the file existed prior to restoring it in the destination folder and depending on this value it will now return nil after the restoration to prevent the renaming function to kick off. Added a test for this specific edge-case as well.
The cleaning logic in util.go was used by Simple and Trashcan but only
really suited Trashcan since it works based on mtimes which Simple does
not use. The cleaning logic in util.go was moved to trashcan.go.
Staggered and Simple seemed to be able to benefit from the same base so
util.go now has the base for those two with an added parameter which
takes a function so it can still handle versioner-specific logic to
decide which files to clean up. Simple now also correctly cleans files
based on their time-stamp in the title together with a specific maximum
amount to keep. The Archive function in Simple.go was changed to get rid
of duplicated code.
Additionally the trashcan testcase which was used by Trashcan as well as
Simple was moved from versioner_test.go to trashcan_test.go to keep it
clean, there was no need to keep it in a separate test file
Eric P