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import shutil
def join(*paths):
"""Like os.path.join but doesn't treat absolute RHS specially"""
import os.path
return os.path.normpath("/".join(paths))
def relative(src, dest):
""" Return a relative path from src to dest.
>>> relative("/usr/bin", "/tmp/foo/bar")
../../tmp/foo/bar
>>> relative("/usr/bin", "/usr/lib")
../lib
>>> relative("/tmp", "/tmp/foo/bar")
foo/bar
"""
import os.path
if hasattr(os.path, "relpath"):
return os.path.relpath(dest, src)
else:
destlist = os.path.normpath(dest).split(os.path.sep)
srclist = os.path.normpath(src).split(os.path.sep)
# Find common section of the path
common = os.path.commonprefix([destlist, srclist])
commonlen = len(common)
# Climb back to the point where they differentiate
relpath = [ os.path.pardir ] * (len(srclist) - commonlen)
if commonlen < len(destlist):
# Add remaining portion
relpath += destlist[commonlen:]
return os.path.sep.join(relpath)
def format_display(path, metadata):
""" Prepare a path for display to the user. """
rel = relative(metadata.getVar("TOPDIR", 1), path)
if len(rel) > len(path):
return path
else:
return rel
class CopyFailed(Exception):
pass
def copytree(src, dst):
# We could use something like shutil.copytree here but it turns out to
# to be slow. It takes twice as long copying to an empty directory.
# If dst already has contents performance can be 15 time slower
# This way we also preserve hardlinks between files in the tree.
import subprocess
bb.mkdirhier(dst)
cmd = 'tar -cf - -C %s -ps . | tar -xf - -C %s' % (src, dst)
ret = subprocess.call(cmd, shell=True)
if ret != 0:
raise CopyFailed("Command %s failed with return value %s" % (cmd, ret))
return
def remove(path):
"""Equivalent to rm -f or rm -rf"""
import os, errno, shutil, glob
for name in glob.glob(path):
try:
os.unlink(name)
except OSError, exc:
if exc.errno == errno.EISDIR:
shutil.rmtree(path)
elif exc.errno != errno.ENOENT:
raise
def symlink(source, destination, force=False):
"""Create a symbolic link"""
import os, errno
try:
if force:
remove(destination)
os.symlink(source, destination)
except OSError, e:
if e.errno != errno.EEXIST or os.readlink(destination) != source:
raise
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