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Still working on the CLA... expect to hear back from corporate legal today.

@vstinner could you have the build-bot take a look, please? :)

Custom buildbot builds are special. I prefer to wait until the "CLA signed" label appears on the PR. Ping me when it's the case. At least, ping me when "Contributor Form Received" becomes "Yes" at: https://bugs.python.org/user32968 This part is done manually by a real human :-) It may take a few days.

@vstinner good to go :)

Ping? @vstinner ?

Could someone please merge this? It's been sitting here for four weeks now... :/

@vstinner or @serhiy-storchaka ?

I reverted the first attempt PR #17170 because the CLA was not signed and the test failed on the Windows 7 buildbot:

ERROR: test_symlink_to_not_implemented (test.test_pathlib.PathTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows7\build\lib\test\test_pathlib.py", line 2031, in test_symlink_to_not_implemented
    link.symlink_to(target)
  File "D:\cygwin\home\db3l\buildarea\3.x.bolen-windows7\build\lib\pathlib.py", line 1395, in symlink_to
    self._accessor.symlink(target, self, target_is_directory)
OSError: [WinError 1314] A required privilege is not held by the client: 'D:\\cygwin\\home\\db3l\\buildarea\\3.x.bolen-windows7\\build\\build\\test_python_848\\test_python_worker_2032\\@test_2032_tmp\\fileA' -> 'D:\\cygwin\\home\\db3l\\buildarea\\3.x.bolen-windows7\\build\\build\\test_python_848\\test_python_worker_2032\\@test_2032_tmp\\dirA\\linkAA'

https://bugs.python.org/issue38811#msg356858

On this PR, the CLA is signed: good, thanks @tohojo. The tests pass on Linux and Windows (the pre-commit CIs are green). I tested manually the PR on my Windows 10 VM: test_pathlib pass there as well.

This new PR also changed the condition to run the test from @unittest.skipIf(support.can_symlink() to @unittest.skipIf(pathlib.supports_symlinks).

support.can_symlink() creates a symbolic test and checks for error. It only returns if os.symlink() is available and works. It returns False in case of error.

pathlib.supports_symlinks is true on non-Windows platforms. On Windows, it's only true if sys.getwindowsversion()[:2] >= (6, 0) which checks for Windows Vista and newer. It should be true on Windows 7.

So I understand that the test is now only run on Windows XP and older, since pathlib.supports_symlinks is only false on very old unsupported Windows versions. Am I right? At least, it looks consistent with the pathlib code:

    if nt:
        if supports_symlinks:
            symlink = os.symlink
        else:
            def symlink(a, b, target_is_directory):
                raise NotImplementedError("symlink() not available on this system")
    else:
        # Under POSIX, os.symlink() takes two args
        @staticmethod
        def symlink(a, b, target_is_directory):
            return os.symlink(a, b)

Note: The original PR #17170 was approved by 3 persons (@cool-RR, @serhiy-storchaka, @brandtbucher).

Thanks @tohojo for the PR, and @vstinner for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

GH-17626 is a backport of this pull request to the 3.8 branch.