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Fix use of DYLD_FALLBACK_LIBRARY_PATH in mjpython.

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According to `man dyld`, the default value for DYLD_FALLBACK_LIBRARY_PATH changed in late 2023. In newer binaries, if DYLD_FALLBACK_LIBRARY_PATH is not set, dyld will use /usr/local/lib and /usr/lib as fallback. If it is set, these locations will not be used as lookup paths unless explicitly added.

Fixes #2781

PiperOrigin-RevId: 791897707
Change-Id: I00d7e80bfbd5e5d7dbf2f601eaad4d9b0e1030f3
This commit is contained in:
Saran Tunyasuvunakool
2025-08-06 16:52:33 -07:00
committed by Copybara-Service
parent fb5792b420
commit 4e67fe79f3
1 changed files with 15 additions and 3 deletions
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python/mujoco/mjpython/mjpython.py
+15 -3
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@@ -60,8 +60,7 @@ def main(argv):
# @executable_path-relative paths now and add them to
# DYLD_FALLBACK_LIBRARY_PATH.
libpython_dir = os.path.dirname(libpython_path)
dyld_fallback_paths = (
os.environ.get('DYLD_FALLBACK_LIBRARY_PATH', '').split(':'))
dyld_fallback_paths = []
pattern = re.compile(r'@executable_path/(.+) \(offset \d+\)\Z')
otool_out = subprocess.run(
['otool', '-l', libpython_path],
@@ -75,7 +74,20 @@ def main(argv):
if new_path not in dyld_fallback_paths:
dyld_fallback_paths.insert(0, new_path)
os.environ['DYLD_FALLBACK_LIBRARY_PATH'] = ':'.join(dyld_fallback_paths)
# According to `man dyld`, the default value for DYLD_FALLBACK_LIBRARY_PATH
# changed in late 2023. In newer binaries, if DYLD_FALLBACK_LIBRARY_PATH is
# not set, dyld will use /usr/local/lib and /usr/lib as fallback. If it is
# set, these locations will not be used as lookup paths unless explicitly
# added.
if dyld_fallback_paths:
if 'DYLD_FALLBACK_LIBRARY_PATH' in os.environ:
old_paths = os.environ['DYLD_FALLBACK_LIBRARY_PATH']
# Empty string splits to [''] but we don't want to append ''.
if old_paths:
dyld_fallback_paths.extend(old_paths.split(':'))
else:
dyld_fallback_paths.extend(('/usr/local/lib', '/usr/lib'))
os.environ['DYLD_FALLBACK_LIBRARY_PATH'] = ':'.join(dyld_fallback_paths)
# argv[0] is currently the path to this script.
# Replace it with sys.executable to preserve e.g. virtualenv path.