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Simplifies alias search path sanitisation. by zooba · Pull Request #301 · python/pymanager · GitHub

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Simplifies alias search path sanitisation. #301

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Merged
zooba merged 1 commit into from
Mar 31, 2026
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Simplifies alias search path sanitisation. #301

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21 changes: 11 additions & 10 deletions src/manage/aliasutils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,19 +10,20 @@

DEFAULT_SITE_DIRS = ["Lib\\site-packages", "Scripts"]

# Our script removes sys.path[0] if empty to avoid trivial search path hijacks.
# In virtually all cases it should be the directory where our scripts are
# generated, which has no importable packages (unless there are unauthorised
# modifications, which are out of scope for our security threat model).
# We don't try to be any more clever, since we don't know what kind of
# interpreter we are running inside - this script may be generated for any
# arbitrary executable installed by PyManager, and so it's possible that
# sys.path[0] is already sanitised or entirely unrelated.

SCRIPT_CODE = """import sys

# Clear sys.path[0] if it contains this script.
# Be careful to use the most compatible Python code possible.
try:
if sys.path[0]:
if sys.argv[0].startswith(sys.path[0]):
sys.path[0] = ""
else:
open(sys.path[0] + "/" + sys.argv[0], "rb").close()
sys.path[0] = ""
except OSError:
pass
if not sys.path[0]:
del sys.path[0]
except AttributeError:
pass
except IndexError:
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