On 2024-03-06 06:28, Corinna Vinschen via Cygwin wrote:
On Mar 6 14:22, Corinna Vinschen via Cygwin wrote:
On Mar 5 19:54, Marcin Wisnicki via Cygwin wrote:
If I invoke ls or anything else that does stat inside OneDrive folder
it will trigger download of all files.
OneDrive uses placeholder files[1] to represent remote files.
I'm guessing reading file content in stat is to support detection of
actually executable files as in here[2]?
I think this should be disabled on non-hydrated placeholder files.
Running `find` or 'ls -R` and having your entire OneDrive downloaded
is extremely problematic.
I could live without executable scripts in the OneDrive folder and
it's easy to mark files as always offline to solve it.
Another idea is to skip checking files with extensions known to be
non-executable such as jpg (or just any extensions that is not known
to be executable).
Nothing of this makes sense from a POSIX library POV. The library can
either not handle placeholder files specially, as today, or it can
handle them all the same way.
Given these placeholder files are actually reparse points of type
IO_REPARSE_TAG_FILE_PLACEHOLDER, we can handle them as symbolic links.
However, the structure of the IO_REPARSE_TAG_FILE_PLACEHOLDER reparse
data buffer is undocumented. It would be helpful if somebody using
OneDrive would examine the content of the attached REPARSE_DATA_BUFFER.
[2]
https://github.com/msys2/msys2-runtime/blob/msys2-3.4.10/winsup/cygwin/fhandler/disk_file.cc#L548
The NtReadFile call at this point is not the problem. It would be
helpful to point to Cygwin's source instead of MSYS2, btw.
Oh, btw., this is from
https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/c8e77b37-3909-4fe6-a4ea-2b9d423b1ee4:
IO_REPARSE_TAG_FILE_PLACEHOLDER
0x80000015
Obsolete.
---------
Used by Windows Shell for legacy placeholder files in Windows 8.1.
Server-side interpretation only, not meaningful over the wire.
So even if we support them, what is their replacement in W10 and later?
May or not help:
https://stackoverflow.com/questions/59152220/cant-get-reparse-point-information-for-the-onedrive-folder
--
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
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