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92f9308e2c
Pass appropriate options to tar invocations in copytree() and copyhardlinktree() to ensure that any extended attributes on the files are preserved during the copy. We have to drop the use cpio in "Copy-pass" mode in copyhardlinktree() because cpio doesn't support extended attributes on files. Instead we revert back to using cp with different patterns depending on whether or not the directory contains dot files. (From OE-Core rev: e591d69103a40ec4f76d1132a6039d9cb1555103) Signed-off-by: Joshua Lock <joshua.g.lock@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
208 lines
6.7 KiB
Python
208 lines
6.7 KiB
Python
import errno
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import glob
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import shutil
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import subprocess
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import os.path
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def join(*paths):
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"""Like os.path.join but doesn't treat absolute RHS specially"""
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return os.path.normpath("/".join(paths))
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def relative(src, dest):
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""" Return a relative path from src to dest.
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>>> relative("/usr/bin", "/tmp/foo/bar")
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../../tmp/foo/bar
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>>> relative("/usr/bin", "/usr/lib")
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../lib
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>>> relative("/tmp", "/tmp/foo/bar")
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foo/bar
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"""
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return os.path.relpath(dest, src)
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def make_relative_symlink(path):
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""" Convert an absolute symlink to a relative one """
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if not os.path.islink(path):
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return
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link = os.readlink(path)
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if not os.path.isabs(link):
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return
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# find the common ancestor directory
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ancestor = path
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depth = 0
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while ancestor and not link.startswith(ancestor):
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ancestor = ancestor.rpartition('/')[0]
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depth += 1
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if not ancestor:
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print("make_relative_symlink() Error: unable to find the common ancestor of %s and its target" % path)
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return
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base = link.partition(ancestor)[2].strip('/')
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while depth > 1:
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base = "../" + base
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depth -= 1
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os.remove(path)
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os.symlink(base, path)
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def format_display(path, metadata):
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""" Prepare a path for display to the user. """
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rel = relative(metadata.getVar("TOPDIR", True), path)
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if len(rel) > len(path):
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return path
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else:
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return rel
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def copytree(src, dst):
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# We could use something like shutil.copytree here but it turns out to
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# to be slow. It takes twice as long copying to an empty directory.
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# If dst already has contents performance can be 15 time slower
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# This way we also preserve hardlinks between files in the tree.
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bb.utils.mkdirhier(dst)
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cmd = "tar --xattrs --xattrs-include='*' -cf - -C %s -p . | tar --xattrs --xattrs-include='*' -xf - -C %s" % (src, dst)
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subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT)
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def copyhardlinktree(src, dst):
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""" Make the hard link when possible, otherwise copy. """
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bb.utils.mkdirhier(dst)
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if os.path.isdir(src) and not len(os.listdir(src)):
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return
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if (os.stat(src).st_dev == os.stat(dst).st_dev):
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# Need to copy directories only with tar first since cp will error if two
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# writers try and create a directory at the same time
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cmd = "cd %s; find . -type d -print | tar --xattrs --xattrs-include='*' -cf - -C %s -p --no-recursion --files-from - | tar --xattrs --xattrs-include='*' -xf - -C %s" % (src, src, dst)
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subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT)
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if os.path.isdir(src):
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import glob
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if len(glob.glob('%s/.??*' % src)) > 0:
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src = src + '/.??* '
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src = src + '/*'
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cmd = 'cp -afl --preserve=xattr %s %s' % (src, dst)
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subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT)
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else:
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copytree(src, dst)
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def remove(path, recurse=True):
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"""Equivalent to rm -f or rm -rf"""
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for name in glob.glob(path):
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try:
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os.unlink(name)
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except OSError as exc:
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if recurse and exc.errno == errno.EISDIR:
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shutil.rmtree(name)
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elif exc.errno != errno.ENOENT:
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raise
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def symlink(source, destination, force=False):
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"""Create a symbolic link"""
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try:
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if force:
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remove(destination)
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os.symlink(source, destination)
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except OSError as e:
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if e.errno != errno.EEXIST or os.readlink(destination) != source:
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raise
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def find(dir, **walkoptions):
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""" Given a directory, recurses into that directory,
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returning all files as absolute paths. """
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for root, dirs, files in os.walk(dir, **walkoptions):
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for file in files:
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yield os.path.join(root, file)
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## realpath() related functions
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def __is_path_below(file, root):
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return (file + os.path.sep).startswith(root)
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def __realpath_rel(start, rel_path, root, loop_cnt, assume_dir):
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"""Calculates real path of symlink 'start' + 'rel_path' below
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'root'; no part of 'start' below 'root' must contain symlinks. """
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have_dir = True
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for d in rel_path.split(os.path.sep):
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if not have_dir and not assume_dir:
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raise OSError(errno.ENOENT, "no such directory %s" % start)
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if d == os.path.pardir: # '..'
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if len(start) >= len(root):
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# do not follow '..' before root
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start = os.path.dirname(start)
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else:
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# emit warning?
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pass
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else:
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(start, have_dir) = __realpath(os.path.join(start, d),
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root, loop_cnt, assume_dir)
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assert(__is_path_below(start, root))
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return start
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def __realpath(file, root, loop_cnt, assume_dir):
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while os.path.islink(file) and len(file) >= len(root):
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if loop_cnt == 0:
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raise OSError(errno.ELOOP, file)
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loop_cnt -= 1
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target = os.path.normpath(os.readlink(file))
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if not os.path.isabs(target):
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tdir = os.path.dirname(file)
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assert(__is_path_below(tdir, root))
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else:
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tdir = root
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file = __realpath_rel(tdir, target, root, loop_cnt, assume_dir)
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try:
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is_dir = os.path.isdir(file)
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except:
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is_dir = false
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return (file, is_dir)
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def realpath(file, root, use_physdir = True, loop_cnt = 100, assume_dir = False):
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""" Returns the canonical path of 'file' with assuming a
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toplevel 'root' directory. When 'use_physdir' is set, all
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preceding path components of 'file' will be resolved first;
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this flag should be set unless it is guaranteed that there is
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no symlink in the path. When 'assume_dir' is not set, missing
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path components will raise an ENOENT error"""
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root = os.path.normpath(root)
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file = os.path.normpath(file)
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if not root.endswith(os.path.sep):
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# letting root end with '/' makes some things easier
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root = root + os.path.sep
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if not __is_path_below(file, root):
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raise OSError(errno.EINVAL, "file '%s' is not below root" % file)
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try:
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if use_physdir:
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file = __realpath_rel(root, file[(len(root) - 1):], root, loop_cnt, assume_dir)
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else:
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file = __realpath(file, root, loop_cnt, assume_dir)[0]
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except OSError as e:
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if e.errno == errno.ELOOP:
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# make ELOOP more readable; without catching it, there will
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# be printed a backtrace with 100s of OSError exceptions
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# else
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raise OSError(errno.ELOOP,
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"too much recursions while resolving '%s'; loop in '%s'" %
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(file, e.strerror))
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raise
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return file
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