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210 lines
7.6 KiB
Python
210 lines
7.6 KiB
Python
"""distutils.dir_util
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Utility functions for manipulating directories and directory trees."""
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import os
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import errno
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from distutils.errors import DistutilsFileError, DistutilsInternalError
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from distutils import log
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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=0o777, verbose=1, dry_run=0):
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"""Create a directory and any missing ancestor directories.
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If the 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 nothing.
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Raise DistutilsFileError if unable to create some directory along the way
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(eg. some sub-path exists, but is a file rather than a directory).
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If 'verbose' is true, print a one-line summary of each mkdir to stdout.
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Return the list of directories actually created.
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"""
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global _path_created
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# Detect a common bug -- name is None
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if not isinstance(name, str):
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raise DistutilsInternalError(
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"mkpath: 'name' must be a string (got %r)" % (name,))
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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(os.path.abspath(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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(head, tail) = os.path.split(head)
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tails.insert(0, tail) # push next higher dir onto stack
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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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abs_head = os.path.abspath(head)
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if _path_created.get(abs_head):
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continue
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if verbose >= 1:
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log.info("creating %s", head)
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if not dry_run:
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try:
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os.mkdir(head, mode)
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except OSError as exc:
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if not (exc.errno == errno.EEXIST and os.path.isdir(head)):
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raise DistutilsFileError(
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"could not create '%s': %s" % (head, exc.args[-1]))
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created_dirs.append(head)
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_path_created[abs_head] = 1
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return created_dirs
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def create_tree(base_dir, files, mode=0o777, verbose=1, dry_run=0):
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"""Create all the empty directories under 'base_dir' needed to put 'files'
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there.
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'base_dir' is just the name of a directory which doesn't necessarily
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exist yet; 'files' is a list of filenames to be interpreted relative to
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'base_dir'. 'base_dir' + the directory portion of every file in 'files'
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will be created if it doesn't already exist. 'mode', 'verbose' and
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'dry_run' flags are as for 'mkpath()'.
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"""
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# First get the list of directories to create
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need_dir = set()
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for file in files:
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need_dir.add(os.path.join(base_dir, os.path.dirname(file)))
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# Now create them
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for dir in sorted(need_dir):
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mkpath(dir, mode, verbose=verbose, dry_run=dry_run)
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def copy_tree(src, dst, preserve_mode=1, preserve_times=1,
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preserve_symlinks=0, update=0, verbose=1, dry_run=0):
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"""Copy an entire directory tree 'src' to a new location 'dst'.
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Both '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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"""
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from distutils.file_util import 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 OSError as e:
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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, e.strerror))
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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 n.startswith('.nfs'):
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# skip NFS rename files
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continue
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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 >= 1:
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log.info("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, preserve_mode,
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preserve_times, preserve_symlinks, update,
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verbose=verbose, dry_run=dry_run))
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else:
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copy_file(src_name, dst_name, preserve_mode,
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preserve_times, update, verbose=verbose,
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dry_run=dry_run)
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outputs.append(dst_name)
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return outputs
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def _build_cmdtuple(path, cmdtuples):
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"""Helper for remove_tree()."""
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for f in os.listdir(path):
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real_f = os.path.join(path,f)
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if os.path.isdir(real_f) and not os.path.islink(real_f):
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_build_cmdtuple(real_f, cmdtuples)
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else:
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cmdtuples.append((os.remove, real_f))
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cmdtuples.append((os.rmdir, path))
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def remove_tree(directory, verbose=1, dry_run=0):
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"""Recursively remove an entire directory tree.
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Any errors are ignored (apart from being reported to stdout if 'verbose'
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is true).
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"""
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global _path_created
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if verbose >= 1:
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log.info("removing '%s' (and everything under it)", directory)
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if dry_run:
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return
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cmdtuples = []
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_build_cmdtuple(directory, cmdtuples)
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for cmd in cmdtuples:
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try:
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cmd[0](cmd[1])
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# remove dir from cache if it's already there
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abspath = os.path.abspath(cmd[1])
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if abspath in _path_created:
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del _path_created[abspath]
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except OSError as exc:
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log.warn("error removing %s: %s", directory, exc)
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def ensure_relative(path):
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"""Take the full path 'path', and make it a relative path.
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This is useful to make 'path' the second argument to os.path.join().
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"""
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drive, path = os.path.splitdrive(path)
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if path[0:1] == os.sep:
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path = drive + path[1:]
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return path
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