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"""
dyld emulation
"""
import os
from ctypes.macholib.framework import framework_info
from ctypes.macholib.dylib import dylib_info
from itertools import *
try:
from _ctypes import _dyld_shared_cache_contains_path
except ImportError:
def _dyld_shared_cache_contains_path(*args):
raise NotImplementedError
__all__ = [
'dyld_find', 'framework_find',
'framework_info', 'dylib_info',
]
# These are the defaults as per man dyld(1)
#
DEFAULT_FRAMEWORK_FALLBACK = [
os.path.expanduser("~/Library/Frameworks"),
"/Library/Frameworks",
"/Network/Library/Frameworks",
"/System/Library/Frameworks",
]
DEFAULT_LIBRARY_FALLBACK = [
os.path.expanduser("~/lib"),
"/usr/local/lib",
"/lib",
"/usr/lib",
]
def dyld_env(env, var):
if env is None:
env = os.environ
rval = env.get(var)
if rval is None:
return []
return rval.split(':')
def dyld_image_suffix(env=None):
if env is None:
env = os.environ
return env.get('DYLD_IMAGE_SUFFIX')
def dyld_framework_path(env=None):
return dyld_env(env, 'DYLD_FRAMEWORK_PATH')
def dyld_library_path(env=None):
return dyld_env(env, 'DYLD_LIBRARY_PATH')
def dyld_fallback_framework_path(env=None):
return dyld_env(env, 'DYLD_FALLBACK_FRAMEWORK_PATH')
def dyld_fallback_library_path(env=None):
return dyld_env(env, 'DYLD_FALLBACK_LIBRARY_PATH')
def dyld_image_suffix_search(iterator, env=None):
"""For a potential path iterator, add DYLD_IMAGE_SUFFIX semantics"""
suffix = dyld_image_suffix(env)
if suffix is None:
return iterator
def _inject(iterator=iterator, suffix=suffix):
for path in iterator:
if path.endswith('.dylib'):
yield path[:-len('.dylib')] + suffix + '.dylib'
else:
yield path + suffix
yield path
return _inject()
def dyld_override_search(name, env=None):
# If DYLD_FRAMEWORK_PATH is set and this dylib_name is a
# framework name, use the first file that exists in the framework
# path if any. If there is none go on to search the DYLD_LIBRARY_PATH
# if any.
framework = framework_info(name)
if framework is not None:
for path in dyld_framework_path(env):
yield os.path.join(path, framework['name'])
# If DYLD_LIBRARY_PATH is set then use the first file that exists
# in the path. If none use the original name.
for path in dyld_library_path(env):
yield os.path.join(path, os.path.basename(name))
def dyld_executable_path_search(name, executable_path=None):
# If we haven't done any searching and found a library and the
# dylib_name starts with "@executable_path/" then construct the
# library name.
if name.startswith('@executable_path/') and executable_path is not None:
yield os.path.join(executable_path, name[len('@executable_path/'):])
def dyld_default_search(name, env=None):
yield name
framework = framework_info(name)
if framework is not None:
fallback_framework_path = dyld_fallback_framework_path(env)
for path in fallback_framework_path:
yield os.path.join(path, framework['name'])
fallback_library_path = dyld_fallback_library_path(env)
for path in fallback_library_path:
yield os.path.join(path, os.path.basename(name))
if framework is not None and not fallback_framework_path:
for path in DEFAULT_FRAMEWORK_FALLBACK:
yield os.path.join(path, framework['name'])
if not fallback_library_path:
for path in DEFAULT_LIBRARY_FALLBACK:
yield os.path.join(path, os.path.basename(name))
def dyld_find(name, executable_path=None, env=None):
"""
Find a library or framework using dyld semantics
"""
for path in dyld_image_suffix_search(chain(
dyld_override_search(name, env),
dyld_executable_path_search(name, executable_path),
dyld_default_search(name, env),
), env):
if os.path.isfile(path):
return path
try:
if _dyld_shared_cache_contains_path(path):
return path
except NotImplementedError:
pass
raise ValueError("dylib %s could not be found" % (name,))
def framework_find(fn, executable_path=None, env=None):
"""
Find a framework using dyld semantics in a very loose manner.
Will take input such as:
Python
Python.framework
Python.framework/Versions/Current
"""
error = None
try:
return dyld_find(fn, executable_path=executable_path, env=env)
except ValueError as e:
error = e
fmwk_index = fn.rfind('.framework')
if fmwk_index == -1:
fmwk_index = len(fn)
fn += '.framework'
fn = os.path.join(fn, os.path.basename(fn[:fmwk_index]))
try:
return dyld_find(fn, executable_path=executable_path, env=env)
except ValueError:
raise error
finally:
error = None
def test_dyld_find():
env = {}
assert dyld_find('libSystem.dylib') == '/usr/lib/libSystem.dylib'
assert dyld_find('System.framework/System') == '/System/Library/Frameworks/System.framework/System'
if __name__ == '__main__':
test_dyld_find()