You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
3.4 KiB
93 lines
3.4 KiB
3 years ago
|
"""distutils.dep_util
|
||
|
|
|
||
|
|
Utility functions for simple, timestamp-based dependency of files
|
||
|
|
and groups of files; also, function based entirely on such
|
||
|
|
timestamp dependency analysis."""
|
||
|
|
|
||
|
|
import os
|
||
|
|
from distutils.errors import DistutilsFileError
|
||
|
|
|
||
|
|
|
||
|
|
def newer (source, target):
|
||
|
|
"""Return true if 'source' exists and is more recently modified than
|
||
|
|
'target', or if 'source' exists and 'target' doesn't. Return false if
|
||
|
|
both exist and 'target' is the same age or younger than 'source'.
|
||
|
|
Raise DistutilsFileError if 'source' does not exist.
|
||
|
|
"""
|
||
|
|
if not os.path.exists(source):
|
||
|
|
raise DistutilsFileError("file '%s' does not exist" %
|
||
|
|
os.path.abspath(source))
|
||
|
|
if not os.path.exists(target):
|
||
|
|
return 1
|
||
|
|
|
||
|
|
from stat import ST_MTIME
|
||
|
|
mtime1 = os.stat(source)[ST_MTIME]
|
||
|
|
mtime2 = os.stat(target)[ST_MTIME]
|
||
|
|
|
||
|
|
return mtime1 > mtime2
|
||
|
|
|
||
|
|
# newer ()
|
||
|
|
|
||
|
|
|
||
|
|
def newer_pairwise (sources, targets):
|
||
|
|
"""Walk two filename lists in parallel, testing if each source is newer
|
||
|
|
than its corresponding target. Return a pair of lists (sources,
|
||
|
|
targets) where source is newer than target, according to the semantics
|
||
|
|
of 'newer()'.
|
||
|
|
"""
|
||
|
|
if len(sources) != len(targets):
|
||
|
|
raise ValueError("'sources' and 'targets' must be same length")
|
||
|
|
|
||
|
|
# build a pair of lists (sources, targets) where source is newer
|
||
|
|
n_sources = []
|
||
|
|
n_targets = []
|
||
|
|
for i in range(len(sources)):
|
||
|
|
if newer(sources[i], targets[i]):
|
||
|
|
n_sources.append(sources[i])
|
||
|
|
n_targets.append(targets[i])
|
||
|
|
|
||
|
|
return (n_sources, n_targets)
|
||
|
|
|
||
|
|
# newer_pairwise ()
|
||
|
|
|
||
|
|
|
||
|
|
def newer_group (sources, target, missing='error'):
|
||
|
|
"""Return true if 'target' is out-of-date with respect to any file
|
||
|
|
listed in 'sources'. In other words, if 'target' exists and is newer
|
||
|
|
than every file in 'sources', return false; otherwise return true.
|
||
|
|
'missing' controls what we do when a source file is missing; the
|
||
|
|
default ("error") is to blow up with an OSError from inside 'stat()';
|
||
|
|
if it is "ignore", we silently drop any missing source files; if it is
|
||
|
|
"newer", any missing source files make us assume that 'target' is
|
||
|
|
out-of-date (this is handy in "dry-run" mode: it'll make you pretend to
|
||
|
|
carry out commands that wouldn't work because inputs are missing, but
|
||
|
|
that doesn't matter because you're not actually going to run the
|
||
|
|
commands).
|
||
|
|
"""
|
||
|
|
# If the target doesn't even exist, then it's definitely out-of-date.
|
||
|
|
if not os.path.exists(target):
|
||
|
|
return 1
|
||
|
|
|
||
|
|
# Otherwise we have to find out the hard way: if *any* source file
|
||
|
|
# is more recent than 'target', then 'target' is out-of-date and
|
||
|
|
# we can immediately return true. If we fall through to the end
|
||
|
|
# of the loop, then 'target' is up-to-date and we return false.
|
||
|
|
from stat import ST_MTIME
|
||
|
|
target_mtime = os.stat(target)[ST_MTIME]
|
||
|
|
for source in sources:
|
||
|
|
if not os.path.exists(source):
|
||
|
|
if missing == 'error': # blow up when we stat() the file
|
||
|
|
pass
|
||
|
|
elif missing == 'ignore': # missing source dropped from
|
||
|
|
continue # target's dependency list
|
||
|
|
elif missing == 'newer': # missing source means target is
|
||
|
|
return 1 # out-of-date
|
||
|
|
|
||
|
|
source_mtime = os.stat(source)[ST_MTIME]
|
||
|
|
if source_mtime > target_mtime:
|
||
|
|
return 1
|
||
|
|
else:
|
||
|
|
return 0
|
||
|
|
|
||
|
|
# newer_group ()
|