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bpo-38811: Check for presence of os.link method in pathlib (GH-17225)

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Commit 6b5b013bcc ("bpo-26978: Implement pathlib.Path.link_to (Using
os.link) (GH-12990)") introduced a new link_to method in pathlib. However,
this makes pathlib crash when the 'os' module is missing a 'link' method.

Fix this by checking for the presence of the 'link' method on pathlib
module import, and if it's not present, turn it into a runtime error like
those emitted when there is no lchmod() or symlink().

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
This commit is contained in:
Toke Høiland-Jørgensen 2019-12-16 13:23:55 +01:00 • committed by Victor Stinner
parent 1ca8fb187e
commit 092435e932
3 changed files with 17 additions and 1 deletions
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7
Lib/pathlib.py
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@ -418,7 +418,12 @@ class _NormalAccessor(_Accessor):
unlink = os.unlink
link_to = os.link
if hasattr(os, "link"):
link_to = os.link
else:
@staticmethod
def link_to(self, target):
raise NotImplementedError("os.link() not available on this system")
rmdir = os.rmdir