mirror of https://github.com/python/cpython.git
423 lines
14 KiB
Python
423 lines
14 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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__rcsid__ = "$Id$"
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import os
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from distutils.errors import *
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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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# 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, return silently. Raise
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DistutilsFileError if unable to create some directory along the
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way (eg. some sub-path exists, but is a file rather than a
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directory). If 'verbose' is true, print a one-line summary of
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each mkdir to stdout."""
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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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if os.path.isdir (name):
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return
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if PATH_CREATED.get (name):
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return
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(head, tail) = os.path.split (name)
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if not tail: # in case 'name' has trailing slash
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(head, tail) = os.path.split (head)
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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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except os.error, (errno, errstr):
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raise DistutilsFileError, "%s: %s" % (head, errstr)
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PATH_CREATED[head] = 1
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# mkpath ()
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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 'target' is
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up-to-date relative to its corresponding 'source'. If so, both
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are deleted from their respective lists. Return a list of tuples
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containing the deleted (source,target) pairs."""
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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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goners = []
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for i in range (len (sources)-1, -1, -1):
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if not newer (sources[i], targets[i]):
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goners.append ((sources[i], targets[i]))
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del sources[i]
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del targets[i]
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goners.reverse()
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return goners
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# newer_pairwise ()
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def newer_group (sources, target):
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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."""
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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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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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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, "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, "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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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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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 doesn't copy Mac-specific metadata
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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: 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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if verbose:
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print "copying %s -> %s" % (src, dir)
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if dry_run:
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return 1
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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
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is created with 'mkpath'. The end result of the copy is that
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every file in 'src' is copied to 'dst', and directories under
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'src' are recursively copied to 'dst'. Return the list of files
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copied (under their output names) -- note that if 'update' is true,
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this might be less than the list of files considered. Return
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value is not affected by 'dry_run'.
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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[-1:] = \
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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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if (copy_file (src_name, dst_name,
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preserve_mode, preserve_times,
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update, 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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# 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
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else:
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raise DistutilsFileError, \
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"couldn't move '%s' to '%s': %s" % (src, dst, msg)
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if copy_it:
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copy_file (src, dst)
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try:
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os.unlink (src)
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except os.error, (num, msg):
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try:
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os.unlink (dst)
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except os.error:
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pass
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raise DistutilsFileError, \
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("couldn't move '%s' to '%s' by copy/delete: " +
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"delete '%s' failed: %s") % \
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(src, dst, src, msg)
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return dst
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# move_file ()
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def write_file (filename, contents):
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"""Create a file with the specified naem and write 'contents' (a
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sequence of strings without line terminators) to it."""
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f = open (filename, "w")
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for line in contents:
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f.write (line + "\n")
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f.close ()
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