Bring back .lnk files on Windows and always treat them as non-virtual files.

[allexzander]

Fix #3244

Signed-off-by: alex-z blackslayer4@gmail.com

[allexzander]

@mgallien @tobiasKaminsky One other possible fix for .lnk files on Windows. This PR turns .lnk files to always be treated as normal files instead of placeholders. This allows for avoiding having a VFS hydration freeze.

Two other possible solutions that we have discussed:

• fix Qt's source code to treat .lnk files on Windows as normal files instead of symlinks
• implement a wrapper around QFileInfo for Windows and implement methods that QFileInfo has (it turned to be hard as there are a lot of methods, including the very hard to implement permissions() method and we can't guarantee some code will not use QFileInfo methods on a .lnk placeholder.

[codecov]

Codecov Report

Merging #4968 (225c2dd) into master (9f952e3) will increase coverage by 0.12%.
The diff coverage is 60.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4968      +/-   ##
==========================================
+ Coverage   56.98%   57.10%   +0.12%     
==========================================
  Files         138      138              
  Lines       17232    17230       -2     
==========================================
+ Hits         9819     9839      +20     
+ Misses       7413     7391      -22     

Impacted Files	Coverage Δ
src/csync/vio/csync_vio_local_win.cpp	81.39% <ø> (-0.43%)	⬇️
src/libsync/vfs/cfapi/vfs_cfapi.cpp	85.77% <33.33%> (+1.82%)	⬆️
src/libsync/discovery.cpp	83.95% <100.00%> (-0.05%)	⬇️
src/libsync/syncengine.cpp	85.56% <0.00%> (+0.53%)	⬆️
src/libsync/vfs/cfapi/cfapiwrapper.cpp	74.42% <0.00%> (+1.82%)	⬆️
src/libsync/vfs/cfapi/hydrationjob.cpp	56.08% <0.00%> (+3.70%)	⬆️

[mgallien]

this solution looks interesting.
I am going to test it in the next days

[tobiasKaminsky]

Sounds promising!

[allexzander]

this solution looks interesting. I am going to test it in the next days

I have tested it with different scenarios. Seems to be working.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-4968-225c2dda4c3fe57c24abccb3616bd2614fc812ec-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

Please make sure to quit your existing Nextcloud app and backup your data.

[allexzander]

/backport to stable-3.6