Literal executable names miss symlinks on PATH #188

#!/usr/bin/env python3
import os
import shutil
import subprocess
import tempfile

# set up: the same CPython 3.11 binary named python3.11m in two PATH directories
scene = tempfile.mkdtemp()
link_dir = os.path.join(scene, "link")
copy_dir = os.path.join(scene, "copy")
os.mkdir(link_dir)
os.mkdir(copy_dir)
os.symlink("/usr/bin/python3.11", os.path.join(link_dir, "python3.11m"))
shutil.copy("/usr/bin/python3.11", os.path.join(copy_dir, "python3.11m"))

# run: the same lookup once per directory, each in a fresh process (discovery caches results in-process);
# cwd is neither PATH dir, because _satisfies_path accepts os.path.abspath("python3.11m") before any name check
caller = ["/opt/venv/bin/python", "/tmp/repro.d/find_python3_11m.py"]
via_link = subprocess.run([*caller, link_dir], cwd=scene, capture_output=True, text=True, check=True)
via_copy = subprocess.run([*caller, copy_dir], cwd=scene, capture_output=True, text=True, check=True)
shutil.rmtree(scene)

print(f"PATH={link_dir}   python3.11m -> /usr/bin/python3.11")
print(via_link.stderr, end="")
print("  get_interpreter returned:", via_link.stdout.strip())
print()
print(f"PATH={copy_dir}   python3.11m is a copy of /usr/bin/python3.11")
print(via_copy.stderr, end="")
print("  get_interpreter returned:", via_copy.stdout.strip())

# check: an interpreter found under the requested name must be returned whether it is a symlink or a copy
link_rejected = via_link.stdout.strip() == "None"
copy_accepted = via_copy.stdout.strip() == os.path.join(copy_dir, "python3.11m")
print("BUG" if link_rejected and copy_accepted else "OK")

import logging
import sys

from python_discovery import get_interpreter

logging.basicConfig(level=logging.DEBUG, stream=sys.stderr, format="    %(message)s")

found = get_interpreter("python3.11m", env={"PATH": sys.argv[1]})

print(found.executable if found else None)