Temp dirs not found plotting with b15 dev 47, to the root of a mount point on Windows

[kiwihaitch]

On windows with a drive mountpoint at: C:_\SM01\05 - plotting to this directory path fails with a Temp dir not found. If I create a subdir below it, eg C:_\SM01\05\PLOT - plot works properly.

Log file attached.

[hoffmang9]

Additional notes:

1. That path as tempdir works under Beta 15
2. It's pretty clearly failing in C++ and not the python layer.

[hoffmang9]

Windows Server 2016

[kiwihaitch]

OS: Server 2016. Log re-attached

b15.47-plot-error.txt

[arvidn]

I tried to reproduce this with the C++ plotting tool, on windows. No luck so far, I'm running:

Debug\ProofOfSpace.exe create -k 32 -b 4528 -u 128 -s 65536 -t C:\_\SM01\05 -2 C:\_\SM01\05 -d C:\_\SM01\05

(and make sure I create the directory c:\_\SM01\05)

Looking at the code, this error comes from:

if (!fs::exists(tmp_dirname)) {
   throw InvalidValueException("Temp directory " + tmp_dirname + " does not exist");
}

Since the error message says:

Caught plotting error: Temp directory C:\_\SM01\05 does not exist

It really suggests that the directory "C:_\SM01\05" indeed does not exist. It's possible that there could be other conditions causing fs::exists() to return false though.

[kiwihaitch]

The Path C:_\SM01\05 has to be an NTFS Mountpoint for it to fail (ie has another drive mounted there rather than have it's own drive letter). If a directory below the mountpoint is used eg: C:_\SM01\05\Plot then the plotter is fine. It's only in the specific case of attemptting to plot to the root of the mountpoint.

[arvidn]

oh, I see. The log said "C:_..." so I missed that you're using the per-drive working directory.

but it's the mount-point that's relevant.

[arvidn]

I have reproduced the issue

[arvidn]

gulrak/filesystem#75

[arvidn]

as far as I can tell, this has been resolved

[hoffmang9]

This was directly fixed and the lingering other Windows issue should be resolved by #125

Closing.