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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 Error(EnvironmentError):
pass
# Based on shutil.copytree but with features removed and
# No fatal error is dst already exists
# Handle symlinks that already exist
def copytree(src, dst):
names = os.listdir(src)
bb.mkdirhier(dst)
errors = []
for name in names:
srcname = os.path.join(src, name)
dstname = os.path.join(dst, name)
try:
if os.path.islink(srcname):
linkto = os.readlink(srcname)
if os.path.lexists(dstname):
os.unlink(dstname)
os.symlink(linkto, dstname)
elif os.path.isdir(srcname):
copytree(srcname, dstname)
else:
bb.utils.copyfile(srcname, dstname)
except (IOError, os.error), why:
errors.append((srcname, dstname, str(why)))
# catch the Error from the recursive copytree so that we can
# continue with other files
except Error, err:
errors.extend(err.args[0])
try:
shutil.copystat(src, dst)
except OSError, why:
errors.extend((src, dst, str(why)))
if errors:
raise Error, errors
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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