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Filename : dir_util.py
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"""distutils.dir_util

Utility functions for manipulating directories and directory trees."""

import os
import errno
from distutils.errors import DistutilsFileError, DistutilsInternalError
from distutils import log

# cache for by mkpath() -- in addition to cheapening redundant calls,
# eliminates redundant "creating /foo/bar/baz" messages in dry-run mode
_path_created = {}

# I don't use os.makedirs because a) it's new to Python 1.5.2, and
# b) it blows up if the directory already exists (I want to silently
# succeed in that case).
def mkpath(name, mode=0o777, verbose=1, dry_run=0):
    """Create a directory and any missing ancestor directories.

    If the directory already exists (or if 'name' is the empty string, which
    means the current directory, which of course exists), then do nothing.
    Raise DistutilsFileError if unable to create some directory along the way
    (eg. some sub-path exists, but is a file rather than a directory).
    If 'verbose' is true, print a one-line summary of each mkdir to stdout.
    Return the list of directories actually created.
    """

    global _path_created

    # Detect a common bug -- name is None
    if not isinstance(name, str):
        raise DistutilsInternalError(
              "mkpath: 'name' must be a string (got %r)" % (name,))

    # XXX what's the better way to handle verbosity? print as we create
    # each directory in the path (the current behaviour), or only announce
    # the creation of the whole path? (quite easy to do the latter since
    # we're not using a recursive algorithm)

    name = os.path.normpath(name)
    created_dirs = []
    if os.path.isdir(name) or name == '':
        return created_dirs
    if _path_created.get(os.path.abspath(name)):
        return created_dirs

    (head, tail) = os.path.split(name)
    tails = [tail]                      # stack of lone dirs to create

    while head and tail and not os.path.isdir(head):
        (head, tail) = os.path.split(head)
        tails.insert(0, tail)          # push next higher dir onto stack

    # now 'head' contains the deepest directory that already exists
    # (that is, the child of 'head' in 'name' is the highest directory
    # that does *not* exist)
    for d in tails:
        #print "head = %s, d = %s: " % (head, d),
        head = os.path.join(head, d)
        abs_head = os.path.abspath(head)

        if _path_created.get(abs_head):
            continue

        if verbose >= 1:
            log.info("creating %s", head)

        if not dry_run:
            try:
                os.mkdir(head, mode)
            except OSError as exc:
                if not (exc.errno == errno.EEXIST and os.path.isdir(head)):
                    raise DistutilsFileError(
                          "could not create '%s': %s" % (head, exc.args[-1]))
            created_dirs.append(head)

        _path_created[abs_head] = 1
    return created_dirs

def create_tree(base_dir, files, mode=0o777, verbose=1, dry_run=0):
    """Create all the empty directories under 'base_dir' needed to put 'files'
    there.

    'base_dir' is just the name of a directory which doesn't necessarily
    exist yet; 'files' is a list of filenames to be interpreted relative to
    'base_dir'.  'base_dir' + the directory portion of every file in 'files'
    will be created if it doesn't already exist.  'mode', 'verbose' and
    'dry_run' flags are as for 'mkpath()'.
    """
    # First get the list of directories to create
    need_dir = set()
    for file in files:
        need_dir.add(os.path.join(base_dir, os.path.dirname(file)))

    # Now create them
    for dir in sorted(need_dir):
        mkpath(dir, mode, verbose=verbose, dry_run=dry_run)

def copy_tree(src, dst, preserve_mode=1, preserve_times=1,
              preserve_symlinks=0, update=0, verbose=1, dry_run=0):
    """Copy an entire directory tree 'src' to a new location 'dst'.

    Both 'src' and 'dst' must be directory names.  If 'src' is not a
    directory, raise DistutilsFileError.  If 'dst' does not exist, it is
    created with 'mkpath()'.  The end result of the copy is that every
    file in 'src' is copied to 'dst', and directories under 'src' are
    recursively copied to 'dst'.  Return the list of files that were
    copied or might have been copied, using their output name.  The
    return value is unaffected by 'update' or 'dry_run': it is simply
    the list of all files under 'src', with the names changed to be
    under 'dst'.

    'preserve_mode' and 'preserve_times' are the same as for
    'copy_file'; note that they only apply to regular files, not to
    directories.  If 'preserve_symlinks' is true, symlinks will be
    copied as symlinks (on platforms that support them!); otherwise
    (the default), the destination of the symlink will be copied.
    'update' and 'verbose' are the same as for 'copy_file'.
    """
    from distutils.file_util import copy_file

    if not dry_run and not os.path.isdir(src):
        raise DistutilsFileError(
              "cannot copy tree '%s': not a directory" % src)
    try:
        names = os.listdir(src)
    except OSError as e:
        if dry_run:
            names = []
        else:
            raise DistutilsFileError(
                  "error listing files in '%s': %s" % (src, e.strerror))

    if not dry_run:
        mkpath(dst, verbose=verbose)

    outputs = []

    for n in names:
        src_name = os.path.join(src, n)
        dst_name = os.path.join(dst, n)

        if n.startswith('.nfs'):
            # skip NFS rename files
            continue

        if preserve_symlinks and os.path.islink(src_name):
            link_dest = os.readlink(src_name)
            if verbose >= 1:
                log.info("linking %s -> %s", dst_name, link_dest)
            if not dry_run:
                os.symlink(link_dest, dst_name)
            outputs.append(dst_name)

        elif os.path.isdir(src_name):
            outputs.extend(
                copy_tree(src_name, dst_name, preserve_mode,
                          preserve_times, preserve_symlinks, update,
                          verbose=verbose, dry_run=dry_run))
        else:
            copy_file(src_name, dst_name, preserve_mode,
                      preserve_times, update, verbose=verbose,
                      dry_run=dry_run)
            outputs.append(dst_name)

    return outputs

def _build_cmdtuple(path, cmdtuples):
    """Helper for remove_tree()."""
    for f in os.listdir(path):
        real_f = os.path.join(path,f)
        if os.path.isdir(real_f) and not os.path.islink(real_f):
            _build_cmdtuple(real_f, cmdtuples)
        else:
            cmdtuples.append((os.remove, real_f))
    cmdtuples.append((os.rmdir, path))

def remove_tree(directory, verbose=1, dry_run=0):
    """Recursively remove an entire directory tree.

    Any errors are ignored (apart from being reported to stdout if 'verbose'
    is true).
    """
    global _path_created

    if verbose >= 1:
        log.info("removing '%s' (and everything under it)", directory)
    if dry_run:
        return
    cmdtuples = []
    _build_cmdtuple(directory, cmdtuples)
    for cmd in cmdtuples:
        try:
            cmd[0](cmd[1])
            # remove dir from cache if it's already there
            abspath = os.path.abspath(cmd[1])
            if abspath in _path_created:
                del _path_created[abspath]
        except OSError as exc:
            log.warn("error removing %s: %s", directory, exc)

def ensure_relative(path):
    """Take the full path 'path', and make it a relative path.

    This is useful to make 'path' the second argument to os.path.join().
    """
    drive, path = os.path.splitdrive(path)
    if path[0:1] == os.sep:
        path = drive + path[1:]
    return path