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"""Execute files of Python code."""
import marshal, os, sys, types
from coverage.backward import open_python_source, BUILTINS
from coverage.backward import PYC_MAGIC_NUMBER, imp, importlib_util_find_spec
from coverage.misc import ExceptionDuringRun, NoCode, NoSource
class DummyLoader(object):
"""A shim for the pep302 __loader__, emulating pkgutil.ImpLoader.
Currently only implements the .fullname attribute
"""
def __init__(self, fullname, *_args):
self.fullname = fullname
if importlib_util_find_spec:
def find_module(modulename):
"""Find the module named `modulename`.
Returns the file path of the module, and the name of the enclosing
package.
"""
try:
spec = importlib_util_find_spec(modulename)
except ImportError as err:
raise NoSource(str(err))
if not spec:
raise NoSource("No module named %r" % (modulename,))
pathname = spec.origin
packagename = spec.name
if pathname.endswith("__init__.py"):
mod_main = modulename + ".__main__"
spec = importlib_util_find_spec(mod_main)
if not spec:
raise NoSource(
"No module named %s; "
"%r is a package and cannot be directly executed"
% (mod_main, modulename)
)
pathname = spec.origin
packagename = spec.name
packagename = packagename.rpartition(".")[0]
return pathname, packagename
else:
def find_module(modulename):
"""Find the module named `modulename`.
Returns the file path of the module, and the name of the enclosing
package.
"""
openfile = None
glo, loc = globals(), locals()
try:
# Search for the module - inside its parent package, if any - using
# standard import mechanics.
if '.' in modulename:
packagename, name = modulename.rsplit('.', 1)
package = __import__(packagename, glo, loc, ['__path__'])
searchpath = package.__path__
else:
packagename, name = None, modulename
searchpath = None # "top-level search" in imp.find_module()
openfile, pathname, _ = imp.find_module(name, searchpath)
# Complain if this is a magic non-file module.
if openfile is None and pathname is None:
raise NoSource(
"module does not live in a file: %r" % modulename
)
# If `modulename` is actually a package, not a mere module, then we
# pretend to be Python 2.7 and try running its __main__.py script.
if openfile is None:
packagename = modulename
name = '__main__'
package = __import__(packagename, glo, loc, ['__path__'])
searchpath = package.__path__
openfile, pathname, _ = imp.find_module(name, searchpath)
except ImportError as err:
raise NoSource(str(err))
finally:
if openfile:
openfile.close()
return pathname, packagename
def run_python_module(modulename, args):
"""Run a python module, as though with ``python -m name args...``.
`modulename` is the name of the module, possibly a dot-separated name.
`args` is the argument array to present as sys.argv, including the first
element naming the module being executed.
"""
pathname, packagename = find_module(modulename)
pathname = os.path.abspath(pathname)
args[0] = pathname
run_python_file(pathname, args, package=packagename, modulename=modulename)
def run_python_file(filename, args, package=None, modulename=None):
"""Run a python file as if it were the main program on the command line.
`filename` is the path to the file to execute, it need not be a .py file.
`args` is the argument array to present as sys.argv, including the first
element naming the file being executed. `package` is the name of the
enclosing package, if any.
`modulename` is the name of the module the file was run as.
"""
if modulename is None and sys.version_info >= (3, 3):
modulename = '__main__'
# Create a module to serve as __main__
old_main_mod = sys.modules['__main__']
main_mod = types.ModuleType('__main__')
sys.modules['__main__'] = main_mod
main_mod.__file__ = filename
if package:
main_mod.__package__ = package
if modulename:
main_mod.__loader__ = DummyLoader(modulename)
main_mod.__builtins__ = BUILTINS
# Set sys.argv properly.
old_argv = sys.argv
sys.argv = args
try:
# Make a code object somehow.
if filename.endswith((".pyc", ".pyo")):
code = make_code_from_pyc(filename)
else:
code = make_code_from_py(filename)
# Execute the code object.
try:
exec(code, main_mod.__dict__)
except SystemExit:
# The user called sys.exit(). Just pass it along to the upper
# layers, where it will be handled.
raise
except:
# Something went wrong while executing the user code.
# Get the exc_info, and pack them into an exception that we can
# throw up to the outer loop. We peel one layer off the traceback
# so that the coverage.py code doesn't appear in the final printed
# traceback.
typ, err, tb = sys.exc_info()
# PyPy3 weirdness. If I don't access __context__, then somehow it
# is non-None when the exception is reported at the upper layer,
# and a nested exception is shown to the user. This getattr fixes
# it somehow? https://bitbucket.org/pypy/pypy/issue/1903
getattr(err, '__context__', None)
raise ExceptionDuringRun(typ, err, tb.tb_next)
finally:
# Restore the old __main__
sys.modules['__main__'] = old_main_mod
# Restore the old argv and path
sys.argv = old_argv
def make_code_from_py(filename):
"""Get source from `filename` and make a code object of it."""
# Open the source file.
try:
source_file = open_python_source(filename)
except IOError:
raise NoSource("No file to run: %r" % filename)
with source_file:
source = source_file.read()
# We have the source. `compile` still needs the last line to be clean,
# so make sure it is, then compile a code object from it.
if not source or source[-1] != '\n':
source += '\n'
code = compile(source, filename, "exec")
return code
def make_code_from_pyc(filename):
"""Get a code object from a .pyc file."""
try:
fpyc = open(filename, "rb")
except IOError:
raise NoCode("No file to run: %r" % filename)
with fpyc:
# First four bytes are a version-specific magic number. It has to
# match or we won't run the file.
magic = fpyc.read(4)
if magic != PYC_MAGIC_NUMBER:
raise NoCode("Bad magic number in .pyc file")
# Skip the junk in the header that we don't need.
fpyc.read(4) # Skip the moddate.
if sys.version_info >= (3, 3):
# 3.3 added another long to the header (size), skip it.
fpyc.read(4)
# The rest of the file is the code object we want.
code = marshal.load(fpyc)
return code
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