def __call__(self, *args, **kwargs):
""" Run command and return its dependencies and outputs, using before
and after access times to determine dependencies. """
# For Python pre-2.5, ensure os.stat() returns float atimes
old_stat_float = os.stat_float_times()
os.stat_float_times(True)
originals = self.file_times()
if self.atimes == 2:
befores = originals
atime_resolution = 0
mtime_resolution = 0
else:
befores = self._age_atimes(originals)
atime_resolution = FAT_atime_resolution
mtime_resolution = FAT_mtime_resolution
shell_keywords = dict(silent=False)
shell_keywords.update(kwargs)
shell(*args, **shell_keywords)
afters = self.file_times()
deps = []
outputs = []
for name in afters:
if name in befores:
# if file exists before+after && mtime changed, add to outputs
# Note: Can't just check that atimes > than we think they were
# before because os might have rounded them to a later
# date than what we think we set them to in befores.
# So we make sure they're > by at least 1/2 the
# resolution. This will work for anything with a
# resolution better than FAT.
if afters[name][1]-mtime_resolution/2 > befores[name][1]:
if not self.ignore(name):
outputs.append(name)
elif afters[name][0]-atime_resolution/2 > befores[name][0]:
# otherwise add to deps if atime changed
if not self.ignore(name):
deps.append(name)
else:
# file created (in afters but not befores), add as output
if not self.ignore(name):
outputs.append(name)
if self.atimes < 2:
# Restore atimes of files we didn't access: not for any functional
# reason -- it's just to preserve the access time for the user's info
for name in deps:
originals.pop(name)
for name in originals:
original = originals[name]
if original != afters.get(name, None):
self._utime(name, original[0], original[1])
os.stat_float_times(old_stat_float) # restore stat_float_times value
return deps, outputs
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