CygWin: TypeError: basis_file must be a (true) file, while restoring inremental backup or file

[Olle Lukoie]

This is a resurrection of 670891 (https://bugs.launchpad.net/duplicity/+bug/670891). The same symptoms and the same solution probably.
 I'm using CygWin under Windows 7. Duplicity is downloaded from the home page and built from scratch with command "python setup.py install".
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$ duplicity -V
duplicity 0.7.04
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When trying to restore a specific file (with deltas) or a full backup with deltas - I'm getting 'TypeError: basis_file must be a (true) file'. It's the regression of 670891. It was fixed in 0.6.12 (I looked at the code of that version), there is "os.tmpfile()" in spite of "tempfile.TemporaryFile", but now it employs TemporaryFile again.
I tried to fix the problem with replacing "tempfp = tempfile.TemporaryFile(dir=tempdir.default().dir())" with "tempfp = os.tmpfile()" and the error has gone, but I'm not sure it's the blessed way to do it.

Full command line log is attached.

[Kenneth Loafman (kenneth-loafman)]

The problem that caused the change to tempfile.TemporaryFile was due to the fact that os.tmpfile always creates its file in the system temp directory, not in the directory specified. The fix I applied was to use os.tmpfile in cygwin/windows and tempfile.TemporaryFile in all the rest. This means that cygwin is now broken with respect to temp file placement of this one file (deleted automatically on close).

[Olle Lukoie (irruel-4)]

I believe that's better than broken duplicity. Thank you so much for quick response!