Eryk Sun <eryk...@gmail.com> added the comment:
It's not completely surprising that attempting to traverse a name-surrogate
reparse point under "%UserProfile%\AppData" fails when using the store app. If
you can't or won't move the mountpoint up to %UserProfile%, or anywhere else
outside of the application-data tree, then I suggest using a regular Python
installation from python.org.
The error in Windows 11 is ERROR_MOUNT_POINT_NOT_RESOLVED (649), based on the
NT status code STATUS_MOUNT_POINT_NOT_RESOLVED. This error status is associated
with the kernel routines IoCreateFileSpecifyDeviceObjectHint() [1] and
IoCreateFileEx() [2]:
IoCreateFileEx returns this status value if the DriverContext
parameter is not NULL and if the file or directory name contains
a mount point that resolves to a volume other than the one to
which the specified device object is attached. This device
object is specified by the DeviceObjectHint member of the
IO_DRIVER_CREATE_CONTEXT structure.
A filter driver can use this feature to open a path on a particular volume or
filesystem device (i.e. the device hint) and bypass other filter drivers that
are attached to the device stack. However, if path parsing traverses a reparse
point to another filesystem, it has to fail with
STATUS_MOUNT_POINT_NOT_RESOLVED. Note that a reparse point that targets a path
in the same filesystem works fine. For example:
>>> path = os.path.join(os.environ['appdata'], 'spam')
>>> os.lstat(path).st_reparse_tag == stat.IO_REPARSE_TAG_MOUNT_POINT
True
>>> os.path.realpath(path)
'C:\\Temp\\spam'
>>> os.path.exists(os.path.join(path, 'eggs.py'))
True
>>> subprocess.call(['python', os.path.join(path, 'eggs.py')])
works fine
0
The case of a cross-device mountpoint or symlink under "%UserProfile%\AppData"
also fails when using the store app in Windows 10. However, the error in
Windows 10 is ERROR_INVALID_FUNCTION (1), from the status code
STATUS_NOT_IMPLEMENTED, so the underlying implementation details must be quite
different. I was able to work around the limitation somewhat in Windows 10 (but
not Windows 11) by first changing to the mountpoint directory and accessing
relative paths. This doesn't work when running a script, however, since the
interpreter tries to open the fully-qualified path, which has to traverse the
mountpoint or symlink.
---
[1
https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/nf-ntddk-iocreatefilespecifydeviceobjecthint
[2]
https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/nf-ntddk-iocreatefileex.
----------
nosy: +eryksun
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<https://bugs.python.org/issue45710>
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