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gh-142315: Don't pass the "real path" of Pdb script target to system functions #142371

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Merged
jaraco merged 12 commits into from
Dec 10, 2025
+86 −7
Merged

gh-142315: Don't pass the "real path" of Pdb script target to system functions #142371

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7050770
Pick target depending on preconditions
johnslavik Dec 7, 2025
2d8c231
Clarify the news fragment
johnslavik Dec 7, 2025
7196224
Add test capturing missed expectation.
jaraco Dec 7, 2025
5b12904
Add more idiomatic safe realpath helper
johnslavik Dec 7, 2025
3058faf
Merge branch 'jaraco/gh-142315/regr-test' into pdb-realpath-pseudofs-…
jaraco Dec 7, 2025
4ca2bcf
Restore logic where existance and directoriness are checked on realpath.
jaraco Dec 7, 2025
3c79be6
Link GH issue to test.
jaraco Dec 7, 2025
d1d85b9
Extract a function to check the target. Remove the _safe_realpath, no…
jaraco Dec 8, 2025
855aac3
Extract method for replacing sys_path, and isolate realpath usage there.
jaraco Dec 8, 2025
03eae7e
Revert "Extract method for replacing sys_path, and isolate realpath u…
jaraco Dec 8, 2025
6779597
Restore _safe_realpath.
jaraco Dec 8, 2025
d1adfb1
Merge branch 'main' into pdb-realpath-pseudofs-problem
jaraco Dec 8, 2025
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Revert "Extract method for replacing sys_path, and isolate realpath u… 
…sage there."

This reverts commit 855aac3.
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@jaraco
jaraco committed Dec 8, 2025
commit 03eae7e0f269d6937946c6bc88f45e6b626e4bb9
15 changes: 6 additions & 9 deletions Lib/pdb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -183,9 +183,13 @@ class _ExecutableTarget:

class _ScriptTarget(_ExecutableTarget):
def __init__(self, target):
self._target = target
self._check(target)
self._replace_sys_path(target)
self._target = os.path.realpath(target)

# If PYTHONSAFEPATH (-P) is not set, sys.path[0] is the directory
# of pdb, and we should replace it with the directory of the script
if not sys.flags.safe_path:
sys.path[0] = os.path.dirname(self._target)

@staticmethod
def _check(target):
Expand All @@ -199,13 +203,6 @@ def _check(target):
print(f'Error: {target} is a directory')
sys.exit(1)

@staticmethod
def _replace_sys_path(target):
# If PYTHONSAFEPATH (-P) is not set, sys.path[0] is the directory
# of pdb, so replace it with the directory of the script
if not sys.flags.safe_path:
sys.path[0] = os.path.dirname(os.path.realpath(target))

def __repr__(self):
return self._target

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