pip-sync broken on Windows

[miuliano]

Calling pip-sync on Windows returns:

Could not open requirements file: [Errno 13] Permission denied: 'c:\\users\\<username>\\appdata\\local\\temp\\tmpe9jswo'

This was introduced in 3.3.1 by the change to using tempfile.NamedTemporaryFile in sync.py to create the requirements file before passing it to pip install via subprocess.check_call. This is caused by Windows requiring reopened temporary files to be opened with the O_TEMPORARY flag. For context see https://stackoverflow.com/a/15235559.

Environment Versions

1. OS Type: Windows 10
2. Python version: Python 2.7.12
3. pip version: pip 9.0.3
4. pip-tools version: pip-compile, version 3.3.1

Steps to replicate

1. pip-sync -r <requirements_file>

Expected result

Command should complete successfully.

Actual result

Could not open requirements file: [Errno 13] Permission denied: 'c:\\users\\<username>\\appdata\\local\\temp\\tmpe9jswo'

[davidovich]

Yes, this is exactly why we do it by leaving the file around in pip-compile.

[atugushev]

Hello @miuliano, thanks for the report, i'll try to fix it ASAP.

Thank you @davidovich for the info! It should have been done the same as in compile.