| import errno |
| import glob |
| import shutil |
| import subprocess |
| import os.path |
| |
| def join(*paths): |
| """Like os.path.join but doesn't treat absolute RHS specially""" |
| 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 |
| """ |
| |
| return os.path.relpath(dest, src) |
| |
| def make_relative_symlink(path): |
| """ Convert an absolute symlink to a relative one """ |
| if not os.path.islink(path): |
| return |
| link = os.readlink(path) |
| if not os.path.isabs(link): |
| return |
| |
| # find the common ancestor directory |
| ancestor = path |
| depth = 0 |
| while ancestor and not link.startswith(ancestor): |
| ancestor = ancestor.rpartition('/')[0] |
| depth += 1 |
| |
| if not ancestor: |
| print("make_relative_symlink() Error: unable to find the common ancestor of %s and its target" % path) |
| return |
| |
| base = link.partition(ancestor)[2].strip('/') |
| while depth > 1: |
| base = "../" + base |
| depth -= 1 |
| |
| os.remove(path) |
| os.symlink(base, path) |
| |
| def replace_absolute_symlinks(basedir, d): |
| """ |
| Walk basedir looking for absolute symlinks and replacing them with relative ones. |
| The absolute links are assumed to be relative to basedir |
| (compared to make_relative_symlink above which tries to compute common ancestors |
| using pattern matching instead) |
| """ |
| for walkroot, dirs, files in os.walk(basedir): |
| for file in files + dirs: |
| path = os.path.join(walkroot, file) |
| if not os.path.islink(path): |
| continue |
| link = os.readlink(path) |
| if not os.path.isabs(link): |
| continue |
| walkdir = os.path.dirname(path.rpartition(basedir)[2]) |
| base = os.path.relpath(link, walkdir) |
| bb.debug(2, "Replacing absolute path %s with relative path %s" % (link, base)) |
| os.remove(path) |
| os.symlink(base, path) |
| |
| def format_display(path, metadata): |
| """ Prepare a path for display to the user. """ |
| rel = relative(metadata.getVar("TOPDIR"), path) |
| if len(rel) > len(path): |
| return path |
| else: |
| return rel |
| |
| 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. |
| |
| bb.utils.mkdirhier(dst) |
| cmd = "tar --xattrs --xattrs-include='*' -cf - -C %s -p . | tar --xattrs --xattrs-include='*' -xf - -C %s" % (src, dst) |
| subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT) |
| |
| def copyhardlinktree(src, dst): |
| """ Make the hard link when possible, otherwise copy. """ |
| bb.utils.mkdirhier(dst) |
| if os.path.isdir(src) and not len(os.listdir(src)): |
| return |
| |
| if (os.stat(src).st_dev == os.stat(dst).st_dev): |
| # Need to copy directories only with tar first since cp will error if two |
| # writers try and create a directory at the same time |
| 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) |
| subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT) |
| source = '' |
| if os.path.isdir(src): |
| if len(glob.glob('%s/.??*' % src)) > 0: |
| source = './.??* ' |
| source += './*' |
| s_dir = src |
| else: |
| source = src |
| s_dir = os.getcwd() |
| cmd = 'cp -afl --preserve=xattr %s %s' % (source, os.path.realpath(dst)) |
| subprocess.check_output(cmd, shell=True, cwd=s_dir, stderr=subprocess.STDOUT) |
| else: |
| copytree(src, dst) |
| |
| def remove(path, recurse=True): |
| """ |
| Equivalent to rm -f or rm -rf |
| NOTE: be careful about passing paths that may contain filenames with |
| wildcards in them (as opposed to passing an actual wildcarded path) - |
| since we use glob.glob() to expand the path. Filenames containing |
| square brackets are particularly problematic since the they may not |
| actually expand to match the original filename. |
| """ |
| for name in glob.glob(path): |
| try: |
| os.unlink(name) |
| except OSError as exc: |
| if recurse and exc.errno == errno.EISDIR: |
| shutil.rmtree(name) |
| elif exc.errno != errno.ENOENT: |
| raise |
| |
| def symlink(source, destination, force=False): |
| """Create a symbolic link""" |
| try: |
| if force: |
| remove(destination) |
| os.symlink(source, destination) |
| except OSError as e: |
| if e.errno != errno.EEXIST or os.readlink(destination) != source: |
| raise |
| |
| def find(dir, **walkoptions): |
| """ Given a directory, recurses into that directory, |
| returning all files as absolute paths. """ |
| |
| for root, dirs, files in os.walk(dir, **walkoptions): |
| for file in files: |
| yield os.path.join(root, file) |
| |
| |
| ## realpath() related functions |
| def __is_path_below(file, root): |
| return (file + os.path.sep).startswith(root) |
| |
| def __realpath_rel(start, rel_path, root, loop_cnt, assume_dir): |
| """Calculates real path of symlink 'start' + 'rel_path' below |
| 'root'; no part of 'start' below 'root' must contain symlinks. """ |
| have_dir = True |
| |
| for d in rel_path.split(os.path.sep): |
| if not have_dir and not assume_dir: |
| raise OSError(errno.ENOENT, "no such directory %s" % start) |
| |
| if d == os.path.pardir: # '..' |
| if len(start) >= len(root): |
| # do not follow '..' before root |
| start = os.path.dirname(start) |
| else: |
| # emit warning? |
| pass |
| else: |
| (start, have_dir) = __realpath(os.path.join(start, d), |
| root, loop_cnt, assume_dir) |
| |
| assert(__is_path_below(start, root)) |
| |
| return start |
| |
| def __realpath(file, root, loop_cnt, assume_dir): |
| while os.path.islink(file) and len(file) >= len(root): |
| if loop_cnt == 0: |
| raise OSError(errno.ELOOP, file) |
| |
| loop_cnt -= 1 |
| target = os.path.normpath(os.readlink(file)) |
| |
| if not os.path.isabs(target): |
| tdir = os.path.dirname(file) |
| assert(__is_path_below(tdir, root)) |
| else: |
| tdir = root |
| |
| file = __realpath_rel(tdir, target, root, loop_cnt, assume_dir) |
| |
| try: |
| is_dir = os.path.isdir(file) |
| except: |
| is_dir = false |
| |
| return (file, is_dir) |
| |
| def realpath(file, root, use_physdir = True, loop_cnt = 100, assume_dir = False): |
| """ Returns the canonical path of 'file' with assuming a |
| toplevel 'root' directory. When 'use_physdir' is set, all |
| preceding path components of 'file' will be resolved first; |
| this flag should be set unless it is guaranteed that there is |
| no symlink in the path. When 'assume_dir' is not set, missing |
| path components will raise an ENOENT error""" |
| |
| root = os.path.normpath(root) |
| file = os.path.normpath(file) |
| |
| if not root.endswith(os.path.sep): |
| # letting root end with '/' makes some things easier |
| root = root + os.path.sep |
| |
| if not __is_path_below(file, root): |
| raise OSError(errno.EINVAL, "file '%s' is not below root" % file) |
| |
| try: |
| if use_physdir: |
| file = __realpath_rel(root, file[(len(root) - 1):], root, loop_cnt, assume_dir) |
| else: |
| file = __realpath(file, root, loop_cnt, assume_dir)[0] |
| except OSError as e: |
| if e.errno == errno.ELOOP: |
| # make ELOOP more readable; without catching it, there will |
| # be printed a backtrace with 100s of OSError exceptions |
| # else |
| raise OSError(errno.ELOOP, |
| "too much recursions while resolving '%s'; loop in '%s'" % |
| (file, e.strerror)) |
| |
| raise |
| |
| return file |