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.
92 lines
3.4 KiB
92 lines
3.4 KiB
"""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"""Return true if 'target' is out-of-date with respect to any file |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out-of-date (this is handy in "dry-run" mode: it'll make you pretend to |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 ()
|
|
|