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aebf706b4e
- file_util.py: operations on single files - dir_util.py: operations on whole directories or directory trees - dep_util.py: simple timestamp-based dependency analysis - archive_util.py: creation of archive (tar, zip, ...) files The functions left in util.py are miscellany that don't fit in any of the new files.
117 lines
4.2 KiB
Python
117 lines
4.2 KiB
Python
"""distutils.dep_util
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Utility functions for simple, timestamp-based dependency of files
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and groups of files; also, function based entirely on such
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timestamp dependency analysis."""
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# created 2000/04/03, Greg Ward (extracted from util.py)
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__revision__ = "$Id$"
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import os
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from distutils.errors import DistutilsFileError
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def newer (source, target):
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"""Return true if 'source' exists and is more recently modified than
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'target', or if 'source' exists and 'target' doesn't. Return
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false if both exist and 'target' is the same age or younger than
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'source'. Raise DistutilsFileError if 'source' does not
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exist."""
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if not os.path.exists (source):
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raise DistutilsFileError, "file '%s' does not exist" % source
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if not os.path.exists (target):
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return 1
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from stat import ST_MTIME
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mtime1 = os.stat(source)[ST_MTIME]
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mtime2 = os.stat(target)[ST_MTIME]
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return mtime1 > mtime2
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# newer ()
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def newer_pairwise (sources, targets):
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"""Walk two filename lists in parallel, testing if each source is newer
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than its corresponding target. Return a pair of lists (sources,
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targets) where source is newer than target, according to the
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semantics of 'newer()'."""
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if len (sources) != len (targets):
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raise ValueError, "'sources' and 'targets' must be same length"
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# build a pair of lists (sources, targets) where source is newer
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n_sources = []
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n_targets = []
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for i in range (len (sources)):
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if newer (sources[i], targets[i]):
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n_sources.append (sources[i])
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n_targets.append (targets[i])
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return (n_sources, n_targets)
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# newer_pairwise ()
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def newer_group (sources, target, missing='error'):
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"""Return true if 'target' is out-of-date with respect to any
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file listed in 'sources'. In other words, if 'target' exists and
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is newer than every file in 'sources', return false; otherwise
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return true. 'missing' controls what we do when a source file is
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missing; the default ("error") is to blow up with an OSError from
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inside 'stat()'; if it is "ignore", we silently drop any missing
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source files; if it is "newer", any missing source files make us
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assume that 'target' is out-of-date (this is handy in "dry-run"
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mode: it'll make you pretend to carry out commands that wouldn't
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work because inputs are missing, but that doesn't matter because
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you're not actually going to run the commands)."""
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# If the target doesn't even exist, then it's definitely out-of-date.
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if not os.path.exists (target):
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return 1
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# Otherwise we have to find out the hard way: if *any* source file
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# is more recent than 'target', then 'target' is out-of-date and
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# we can immediately return true. If we fall through to the end
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# of the loop, then 'target' is up-to-date and we return false.
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from stat import ST_MTIME
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target_mtime = os.stat (target)[ST_MTIME]
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for source in sources:
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if not os.path.exists (source):
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if missing == 'error': # blow up when we stat() the file
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pass
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elif missing == 'ignore': # missing source dropped from
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continue # target's dependency list
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elif missing == 'newer': # missing source means target is
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return 1 # out-of-date
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source_mtime = os.stat(source)[ST_MTIME]
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if source_mtime > target_mtime:
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return 1
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else:
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return 0
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# newer_group ()
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# XXX this isn't used anywhere, and worse, it has the same name as a method
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# in Command with subtly different semantics. (This one just has one
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# source -> one dest; that one has many sources -> one dest.) Nuke it?
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def make_file (src, dst, func, args,
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verbose=0, update_message=None, noupdate_message=None):
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"""Makes 'dst' from 'src' (both filenames) by calling 'func' with
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'args', but only if it needs to: i.e. if 'dst' does not exist or
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'src' is newer than 'dst'."""
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if newer (src, dst):
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if verbose and update_message:
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print update_message
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apply (func, args)
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else:
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if verbose and noupdate_message:
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print noupdate_message
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# make_file ()
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