[Lldb-commits] [lldb] [lldb] Fix and re-enable TestUseSourceCache.py (PR #111237)

[Pavel Labath via lldb-commits]

labath wrote:

> * I can append to the file from Python (mode="a")
> 
> * I can delete the file from Python (what the current test is doing)
> 
> * I cannot delete the file from File Explorer => says lldb.exe is using the file
> 
> * I cannot overwrite the file from Python (mode="w")
> 
> * I cannot overwrite/save the file from Notepad++
> 
> * I can overwrite/save the file from vi.

Well, that's... interesting. Thanks for gathering these. I suspect that this is due to different strategies for saving a file. I know of basically two: you either delete the file and create a new one in its place (if you want a backup you can rename instead of deleting), or you overwrite the file in place (and make a copy if you want a backup). In vim, this is controlled by the `backupcopy` setting so it would be interesting (but not really necessary) to see if this affects vim's ability to save the file.

With this in mind, deleting the file *is* representative of an editor wanting to save the file using the deletion strategy, but I still think it's not our goal here to ensure the editor *cannot* save the file if the setting is `true`.

https://github.com/llvm/llvm-project/pull/111237