[3.5] bpo-32551: Consistently configure sys.path[0] (GH-575) #5197
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Directory and zipfile execution previously added the parent directory of the directory or zipfile as sys.path[0] and then subsequently overwrote it with the directory or zipfile itself. This caused problems in isolated mode, as it overwrote the "stdlib as a zip archive" entry in sys.path, as the parent directory was never added. The attempted fix to that issue in bpo-29319 created the opposite problem in *non*-isolated mode, by potentially leaving the parent directory on sys.path instead of overwriting it. This change fixes the root cause of the problem by removing the whole "add-and-overwrite" dance for sys.path[0], and instead simply never adds the parent directory to sys.path in the first place. (cherry picked from commit d2977a3)
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Directory and zipfile execution previously added
the parent directory of the directory or zipfile
as sys.path[0] and then subsequently overwrote
it with the directory or zipfile itself.
This caused problems in isolated mode, as it
overwrote the "stdlib as a zip archive" entry
in sys.path, as the parent directory was
never added.
The attempted fix to that issue in bpo-29319
created the opposite problem in non-isolated
mode, by potentially leaving the parent
directory on sys.path instead of overwriting it.
This change fixes the root cause of the problem
by removing the whole "add-and-overwrite" dance
for sys.path[0], and instead simply never adds
the parent directory to sys.path in the first
place.
(cherry picked from commit d2977a3)
https://bugs.python.org/issue32551