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760 lines
27 KiB
Python
760 lines
27 KiB
Python
"""distutils.util
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General-purpose utility functions used throughout the Distutils
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(especially in command classes). Mostly filesystem manipulation, but
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not limited to that. The functions in this module generally raise
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DistutilsFileError when they have problems with the filesystem, because
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os.error in pre-1.5.2 Python only gives the error message and not the
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file causing it."""
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# created 1999/03/08, Greg Ward
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__revision__ = "$Id$"
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import sys, os, string, re, shutil
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from distutils.errors import *
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from distutils.spawn import spawn
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# cache for by mkpath() -- in addition to cheapening redundant calls,
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# eliminates redundant "creating /foo/bar/baz" messages in dry-run mode
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PATH_CREATED = {}
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# for generating verbose output in 'copy_file()'
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_copy_action = { None: 'copying',
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'hard': 'hard linking',
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'sym': 'symbolically linking' }
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# I don't use os.makedirs because a) it's new to Python 1.5.2, and
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# b) it blows up if the directory already exists (I want to silently
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# succeed in that case).
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def mkpath (name, mode=0777, verbose=0, dry_run=0):
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"""Create a directory and any missing ancestor directories. If the
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directory already exists (or if 'name' is the empty string, which
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means the current directory, which of course exists), then do
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nothing. Raise DistutilsFileError if unable to create some
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directory along the way (eg. some sub-path exists, but is a file
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rather than a directory). If 'verbose' is true, print a one-line
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summary of each mkdir to stdout. Return the list of directories
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actually created."""
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global PATH_CREATED
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# XXX what's the better way to handle verbosity? print as we create
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# each directory in the path (the current behaviour), or only announce
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# the creation of the whole path? (quite easy to do the latter since
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# we're not using a recursive algorithm)
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name = os.path.normpath (name)
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created_dirs = []
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if os.path.isdir (name) or name == '':
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return created_dirs
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if PATH_CREATED.get (name):
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return created_dirs
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(head, tail) = os.path.split (name)
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tails = [tail] # stack of lone dirs to create
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while head and tail and not os.path.isdir (head):
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#print "splitting '%s': " % head,
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(head, tail) = os.path.split (head)
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#print "to ('%s','%s')" % (head, tail)
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tails.insert (0, tail) # push next higher dir onto stack
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#print "stack of tails:", tails
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# now 'head' contains the deepest directory that already exists
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# (that is, the child of 'head' in 'name' is the highest directory
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# that does *not* exist)
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for d in tails:
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#print "head = %s, d = %s: " % (head, d),
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head = os.path.join (head, d)
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if PATH_CREATED.get (head):
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continue
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if verbose:
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print "creating", head
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if not dry_run:
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try:
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os.mkdir (head)
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created_dirs.append(head)
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except OSError, exc:
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raise DistutilsFileError, \
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"could not create '%s': %s" % (head, exc[-1])
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PATH_CREATED[head] = 1
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return created_dirs
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# mkpath ()
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def create_tree (base_dir, files, mode=0777, verbose=0, dry_run=0):
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"""Create all the empty directories under 'base_dir' needed to
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put 'files' there. 'base_dir' is just the a name of a directory
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which doesn't necessarily exist yet; 'files' is a list of filenames
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to be interpreted relative to 'base_dir'. 'base_dir' + the
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directory portion of every file in 'files' will be created if it
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doesn't already exist. 'mode', 'verbose' and 'dry_run' flags are as
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for 'mkpath()'."""
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# First get the list of directories to create
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need_dir = {}
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for file in files:
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need_dir[os.path.join (base_dir, os.path.dirname (file))] = 1
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need_dirs = need_dir.keys()
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need_dirs.sort()
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# Now create them
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for dir in need_dirs:
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mkpath (dir, mode, verbose, dry_run)
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# create_tree ()
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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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def _copy_file_contents (src, dst, buffer_size=16*1024):
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"""Copy the file 'src' to 'dst'; both must be filenames. Any error
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opening either file, reading from 'src', or writing to 'dst',
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raises DistutilsFileError. Data is read/written in chunks of
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'buffer_size' bytes (default 16k). No attempt is made to handle
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anything apart from regular files."""
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# Stolen from shutil module in the standard library, but with
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# custom error-handling added.
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fsrc = None
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fdst = None
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try:
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try:
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fsrc = open(src, 'rb')
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not open '%s': %s" % (src, errstr)
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try:
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fdst = open(dst, 'wb')
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not create '%s': %s" % (dst, errstr)
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while 1:
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try:
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buf = fsrc.read (buffer_size)
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not read from '%s': %s" % (src, errstr)
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if not buf:
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break
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try:
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fdst.write(buf)
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not write to '%s': %s" % (dst, errstr)
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finally:
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if fdst:
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fdst.close()
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if fsrc:
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fsrc.close()
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# _copy_file_contents()
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def copy_file (src, dst,
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preserve_mode=1,
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preserve_times=1,
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update=0,
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link=None,
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verbose=0,
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dry_run=0):
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"""Copy a file 'src' to 'dst'. If 'dst' is a directory, then 'src'
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is copied there with the same name; otherwise, it must be a
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filename. (If the file exists, it will be ruthlessly clobbered.)
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If 'preserve_mode' is true (the default), the file's mode (type
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and permission bits, or whatever is analogous on the current
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platform) is copied. If 'preserve_times' is true (the default),
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the last-modified and last-access times are copied as well. If
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'update' is true, 'src' will only be copied if 'dst' does not
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exist, or if 'dst' does exist but is older than 'src'. If
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'verbose' is true, then a one-line summary of the copy will be
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printed to stdout.
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'link' allows you to make hard links (os.link) or symbolic links
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(os.symlink) instead of copying: set it to "hard" or "sym"; if it
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is None (the default), files are copied. Don't set 'link' on
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systems that don't support it: 'copy_file()' doesn't check if
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hard or symbolic linking is availalble.
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Under Mac OS, uses the native file copy function in macostools;
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on other systems, uses '_copy_file_contents()' to copy file
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contents.
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Return true if the file was copied (or would have been copied),
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false otherwise (ie. 'update' was true and the destination is
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up-to-date)."""
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# XXX if the destination file already exists, we clobber it if
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# copying, but blow up if linking. Hmmm. And I don't know what
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# macostools.copyfile() does. Should definitely be consistent, and
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# should probably blow up if destination exists and we would be
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# changing it (ie. it's not already a hard/soft link to src OR
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# (not update) and (src newer than dst).
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from stat import *
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if not os.path.isfile (src):
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raise DistutilsFileError, \
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"can't copy '%s': doesn't exist or not a regular file" % src
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if os.path.isdir (dst):
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dir = dst
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dst = os.path.join (dst, os.path.basename (src))
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else:
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dir = os.path.dirname (dst)
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if update and not newer (src, dst):
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if verbose:
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print "not copying %s (output up-to-date)" % src
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return 0
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try:
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action = _copy_action[link]
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except KeyError:
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raise ValueError, \
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"invalid value '%s' for 'link' argument" % link
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if verbose:
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print "%s %s -> %s" % (action, src, dir)
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if dry_run:
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return 1
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# On a Mac, use the native file copy routine
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if os.name == 'mac':
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import macostools
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try:
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macostools.copy (src, dst, 0, preserve_times)
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except OSError, exc:
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raise DistutilsFileError, \
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"could not copy '%s' to '%s': %s" % (src, dst, exc[-1])
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# If linking (hard or symbolic), use the appropriate system call
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# (Unix only, of course, but that's the caller's responsibility)
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elif link == 'hard':
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if not (os.path.exists (dst) and os.path.samefile (src, dst)):
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os.link (src, dst)
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elif link == 'sym':
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if not (os.path.exists (dst) and os.path.samefile (src, dst)):
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os.symlink (src, dst)
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# Otherwise (non-Mac, not linking), copy the file contents and
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# (optionally) copy the times and mode.
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else:
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_copy_file_contents (src, dst)
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if preserve_mode or preserve_times:
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st = os.stat (src)
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# According to David Ascher <da@ski.org>, utime() should be done
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# before chmod() (at least under NT).
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if preserve_times:
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os.utime (dst, (st[ST_ATIME], st[ST_MTIME]))
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if preserve_mode:
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os.chmod (dst, S_IMODE (st[ST_MODE]))
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return 1
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# copy_file ()
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def copy_tree (src, dst,
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preserve_mode=1,
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preserve_times=1,
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preserve_symlinks=0,
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update=0,
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verbose=0,
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dry_run=0):
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"""Copy an entire directory tree 'src' to a new location 'dst'. Both
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'src' and 'dst' must be directory names. If 'src' is not a
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directory, raise DistutilsFileError. If 'dst' does not exist, it is
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created with 'mkpath()'. The end result of the copy is that every
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file in 'src' is copied to 'dst', and directories under 'src' are
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recursively copied to 'dst'. Return the list of files that were
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copied or might have been copied, using their output name. The
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return value is unaffected by 'update' or 'dry_run': it is simply
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the list of all files under 'src', with the names changed to be
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under 'dst'.
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'preserve_mode' and 'preserve_times' are the same as for
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'copy_file'; note that they only apply to regular files, not to
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directories. If 'preserve_symlinks' is true, symlinks will be
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copied as symlinks (on platforms that support them!); otherwise
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(the default), the destination of the symlink will be copied.
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'update' and 'verbose' are the same as for 'copy_file'."""
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if not dry_run and not os.path.isdir (src):
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raise DistutilsFileError, \
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"cannot copy tree '%s': not a directory" % src
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try:
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names = os.listdir (src)
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except os.error, (errno, errstr):
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if dry_run:
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names = []
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else:
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raise DistutilsFileError, \
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"error listing files in '%s': %s" % (src, errstr)
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if not dry_run:
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mkpath (dst, verbose=verbose)
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outputs = []
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for n in names:
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src_name = os.path.join (src, n)
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dst_name = os.path.join (dst, n)
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if preserve_symlinks and os.path.islink (src_name):
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link_dest = os.readlink (src_name)
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if verbose:
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print "linking %s -> %s" % (dst_name, link_dest)
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if not dry_run:
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os.symlink (link_dest, dst_name)
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outputs.append (dst_name)
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elif os.path.isdir (src_name):
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outputs.extend (
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copy_tree (src_name, dst_name,
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preserve_mode, preserve_times, preserve_symlinks,
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update, verbose, dry_run))
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else:
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copy_file (src_name, dst_name,
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preserve_mode, preserve_times,
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update, None, verbose, dry_run)
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outputs.append (dst_name)
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return outputs
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# copy_tree ()
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def remove_tree (directory, verbose=0, dry_run=0):
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"""Recursively remove an entire directory tree. Any errors are ignored
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(apart from being reported to stdout if 'verbose' is true)."""
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if verbose:
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print "removing '%s' (and everything under it)" % directory
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if dry_run:
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return
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try:
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shutil.rmtree(directory,1)
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except (IOError, OSError), exc:
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if verbose:
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if exc.filename:
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print "error removing %s: %s (%s)" % \
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(directory, exc.strerror, exc.filename)
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else:
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print "error removing %s: %s" % (directory, exc.strerror)
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# XXX I suspect this is Unix-specific -- need porting help!
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def move_file (src, dst,
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verbose=0,
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dry_run=0):
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"""Move a file 'src' to 'dst'. If 'dst' is a directory, the file
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will be moved into it with the same name; otherwise, 'src' is
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just renamed to 'dst'. Return the new full name of the file.
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Handles cross-device moves on Unix using
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'copy_file()'. What about other systems???"""
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from os.path import exists, isfile, isdir, basename, dirname
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if verbose:
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print "moving %s -> %s" % (src, dst)
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if dry_run:
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return dst
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if not isfile (src):
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raise DistutilsFileError, \
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"can't move '%s': not a regular file" % src
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if isdir (dst):
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dst = os.path.join (dst, basename (src))
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elif exists (dst):
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raise DistutilsFileError, \
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"can't move '%s': destination '%s' already exists" % \
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(src, dst)
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if not isdir (dirname (dst)):
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raise DistutilsFileError, \
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"can't move '%s': destination '%s' not a valid path" % \
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(src, dst)
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copy_it = 0
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try:
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os.rename (src, dst)
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except os.error, (num, msg):
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if num == errno.EXDEV:
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copy_it = 1
|
|
else:
|
|
raise DistutilsFileError, \
|
|
"couldn't move '%s' to '%s': %s" % (src, dst, msg)
|
|
|
|
if copy_it:
|
|
copy_file (src, dst)
|
|
try:
|
|
os.unlink (src)
|
|
except os.error, (num, msg):
|
|
try:
|
|
os.unlink (dst)
|
|
except os.error:
|
|
pass
|
|
raise DistutilsFileError, \
|
|
("couldn't move '%s' to '%s' by copy/delete: " +
|
|
"delete '%s' failed: %s") % \
|
|
(src, dst, src, msg)
|
|
|
|
return dst
|
|
|
|
# move_file ()
|
|
|
|
|
|
def write_file (filename, contents):
|
|
"""Create a file with the specified name and write 'contents' (a
|
|
sequence of strings without line terminators) to it."""
|
|
|
|
f = open (filename, "w")
|
|
for line in contents:
|
|
f.write (line + "\n")
|
|
f.close ()
|
|
|
|
|
|
def get_platform ():
|
|
"""Return a string (suitable for tacking onto directory names) that
|
|
identifies the current platform. Under Unix, identifies both the OS
|
|
and hardware architecture, e.g. "linux-i586", "solaris-sparc",
|
|
"irix-mips". For Windows and Mac OS, just returns 'sys.platform' --
|
|
i.e. "???" or "???"."""
|
|
|
|
if os.name == 'posix':
|
|
(OS, _, rel, _, arch) = os.uname()
|
|
return "%s%c-%s" % (string.lower (OS), rel[0], string.lower (arch))
|
|
else:
|
|
return sys.platform
|
|
|
|
# get_platform()
|
|
|
|
|
|
def native_path (pathname):
|
|
"""Return 'pathname' as a name that will work on the native
|
|
filesystem, i.e. split it on '/' and put it back together again
|
|
using the current directory separator. Needed because filenames in
|
|
the setup script are always supplied in Unix style, and have to be
|
|
converted to the local convention before we can actually use them in
|
|
the filesystem. Raises DistutilsValueError if 'pathname' is
|
|
absolute (starts with '/') or contains local directory separators
|
|
(unless the local separator is '/', of course)."""
|
|
|
|
if pathname[0] == '/':
|
|
raise DistutilsValueError, "path '%s' cannot be absolute" % pathname
|
|
if pathname[-1] == '/':
|
|
raise DistutilsValueError, "path '%s' cannot end with '/'" % pathname
|
|
if os.sep != '/' and os.sep in pathname:
|
|
raise DistutilsValueError, \
|
|
"path '%s' cannot contain '%c' character" % \
|
|
(pathname, os.sep)
|
|
|
|
paths = string.split (pathname, '/')
|
|
return apply (os.path.join, paths)
|
|
else:
|
|
return pathname
|
|
|
|
# native_path ()
|
|
|
|
|
|
def _check_environ ():
|
|
"""Ensure that 'os.environ' has all the environment variables we
|
|
guarantee that users can use in config files, command-line
|
|
options, etc. Currently this includes:
|
|
HOME - user's home directory (Unix only)
|
|
PLAT - desription of the current platform, including hardware
|
|
and OS (see 'get_platform()')
|
|
"""
|
|
|
|
if os.name == 'posix' and not os.environ.has_key('HOME'):
|
|
import pwd
|
|
os.environ['HOME'] = pwd.getpwuid (os.getuid())[5]
|
|
|
|
if not os.environ.has_key('PLAT'):
|
|
os.environ['PLAT'] = get_platform ()
|
|
|
|
|
|
def subst_vars (str, local_vars):
|
|
"""Perform shell/Perl-style variable substitution on 'string'.
|
|
Every occurence of '$' followed by a name, or a name enclosed in
|
|
braces, is considered a variable. Every variable is substituted by
|
|
the value found in the 'local_vars' dictionary, or in 'os.environ'
|
|
if it's not in 'local_vars'. 'os.environ' is first checked/
|
|
augmented to guarantee that it contains certain values: see
|
|
'_check_environ()'. Raise ValueError for any variables not found in
|
|
either 'local_vars' or 'os.environ'."""
|
|
|
|
_check_environ ()
|
|
def _subst (match, local_vars=local_vars):
|
|
var_name = match.group(1)
|
|
if local_vars.has_key (var_name):
|
|
return str (local_vars[var_name])
|
|
else:
|
|
return os.environ[var_name]
|
|
|
|
return re.sub (r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, str)
|
|
|
|
# subst_vars ()
|
|
|
|
|
|
def make_tarball (base_name, base_dir, compress="gzip",
|
|
verbose=0, dry_run=0):
|
|
"""Create a (possibly compressed) tar file from all the files under
|
|
'base_dir'. 'compress' must be "gzip" (the default), "compress", or
|
|
None. Both "tar" and the compression utility named by 'compress'
|
|
must be on the default program search path, so this is probably
|
|
Unix-specific. The output tar file will be named 'base_dir' +
|
|
".tar", possibly plus the appropriate compression extension
|
|
(".gz" or ".Z"). Return the output filename."""
|
|
|
|
# XXX GNU tar 1.13 has a nifty option to add a prefix directory.
|
|
# It's pretty new, though, so we certainly can't require it --
|
|
# but it would be nice to take advantage of it to skip the
|
|
# "create a tree of hardlinks" step! (Would also be nice to
|
|
# detect GNU tar to use its 'z' option and save a step.)
|
|
|
|
compress_ext = { 'gzip': ".gz",
|
|
'compress': ".Z" }
|
|
|
|
if compress is not None and compress not in ('gzip', 'compress'):
|
|
raise ValueError, \
|
|
"bad value for 'compress': must be None, 'gzip', or 'compress'"
|
|
|
|
archive_name = base_name + ".tar"
|
|
cmd = ["tar", "-cf", archive_name, base_dir]
|
|
spawn (cmd, verbose=verbose, dry_run=dry_run)
|
|
|
|
if compress:
|
|
spawn ([compress, archive_name], verbose=verbose, dry_run=dry_run)
|
|
return archive_name + compress_ext[compress]
|
|
else:
|
|
return archive_name
|
|
|
|
# make_tarball ()
|
|
|
|
|
|
def make_zipfile (base_name, base_dir, verbose=0, dry_run=0):
|
|
"""Create a zip file from all the files under 'base_dir'. The
|
|
output zip file will be named 'base_dir' + ".zip". Uses either the
|
|
InfoZIP "zip" utility (if installed and found on the default search
|
|
path) or the "zipfile" Python module (if available). If neither
|
|
tool is available, raises DistutilsExecError. Returns the name
|
|
of the output zip file."""
|
|
|
|
# This initially assumed the Unix 'zip' utility -- but
|
|
# apparently InfoZIP's zip.exe works the same under Windows, so
|
|
# no changes needed!
|
|
|
|
zip_filename = base_name + ".zip"
|
|
try:
|
|
spawn (["zip", "-rq", zip_filename, base_dir],
|
|
verbose=verbose, dry_run=dry_run)
|
|
except DistutilsExecError:
|
|
|
|
# XXX really should distinguish between "couldn't find
|
|
# external 'zip' command" and "zip failed" -- shouldn't try
|
|
# again in the latter case. (I think fixing this will
|
|
# require some cooperation from the spawn module -- perhaps
|
|
# a utility function to search the path, so we can fallback
|
|
# on zipfile.py without the failed spawn.)
|
|
try:
|
|
import zipfile
|
|
except ImportError:
|
|
raise DistutilsExecError, \
|
|
("unable to create zip file '%s': " +
|
|
"could neither find a standalone zip utility nor " +
|
|
"import the 'zipfile' module") % zip_filename
|
|
|
|
if verbose:
|
|
print "creating '%s' and adding '%s' to it" % \
|
|
(zip_filename, base_dir)
|
|
|
|
def visit (z, dirname, names):
|
|
for name in names:
|
|
path = os.path.join (dirname, name)
|
|
if os.path.isfile (path):
|
|
z.write (path, path)
|
|
|
|
if not dry_run:
|
|
z = zipfile.ZipFile (zip_filename, "wb",
|
|
compression=zipfile.ZIP_DEFLATED)
|
|
|
|
os.path.walk (base_dir, visit, z)
|
|
z.close()
|
|
|
|
return zip_filename
|
|
|
|
# make_zipfile ()
|
|
|
|
|
|
def make_archive (base_name, format,
|
|
root_dir=None, base_dir=None,
|
|
verbose=0, dry_run=0):
|
|
|
|
"""Create an archive file (eg. zip or tar). 'base_name' is the name
|
|
of the file to create, minus any format-specific extension; 'format'
|
|
is the archive format: one of "zip", "tar", "ztar", or "gztar".
|
|
'root_dir' is a directory that will be the root directory of the
|
|
archive; ie. we typically chdir into 'root_dir' before creating the
|
|
archive. 'base_dir' is the directory where we start archiving from;
|
|
ie. 'base_dir' will be the common prefix of all files and
|
|
directories in the archive. 'root_dir' and 'base_dir' both default
|
|
to the current directory."""
|
|
|
|
save_cwd = os.getcwd()
|
|
if root_dir is not None:
|
|
if verbose:
|
|
print "changing into '%s'" % root_dir
|
|
base_name = os.path.abspath (base_name)
|
|
if not dry_run:
|
|
os.chdir (root_dir)
|
|
|
|
if base_dir is None:
|
|
base_dir = os.curdir
|
|
|
|
kwargs = { 'verbose': verbose,
|
|
'dry_run': dry_run }
|
|
|
|
if format == 'gztar':
|
|
func = make_tarball
|
|
kwargs['compress'] = 'gzip'
|
|
elif format == 'ztar':
|
|
func = make_tarball
|
|
kwargs['compress'] = 'compress'
|
|
elif format == 'tar':
|
|
func = make_tarball
|
|
elif format == 'zip':
|
|
func = make_zipfile
|
|
|
|
apply (func, (base_name, base_dir), kwargs)
|
|
|
|
if root_dir is not None:
|
|
if verbose:
|
|
print "changing back to '%s'" % save_cwd
|
|
os.chdir (save_cwd)
|
|
|
|
# make_archive ()
|