1 """Metadata read/write support for bup."""
3 # Copyright (C) 2010 Rob Browning
5 # This code is covered under the terms of the GNU Library General
6 # Public License as described in the bup LICENSE file.
7 import errno, os, sys, stat, time, pwd, grp, socket
8 from cStringIO import StringIO
9 from bup import vint, xstat
10 from bup.drecurse import recursive_dirlist
11 from bup.helpers import add_error, mkdirp, log, is_superuser
12 from bup.helpers import pwd_from_uid, pwd_from_name, grp_from_gid, grp_from_name
13 from bup.xstat import utime, lutime
16 if sys.platform.startswith('linux'):
20 log('Warning: Linux xattr support missing; install python-pyxattr.\n')
24 except AttributeError:
25 log('Warning: python-xattr module is too old; '
26 'install python-pyxattr instead.\n')
30 if not (sys.platform.startswith('cygwin') or sys.platform.startswith('darwin')):
34 log('Warning: POSIX ACL support missing; install python-pylibacl.\n')
37 from bup._helpers import get_linux_file_attr, set_linux_file_attr
39 # No need for a warning here; the only reason they won't exist is that we're
40 # not on Linux, in which case files don't have any linux attrs anyway, so
41 # lacking the functions isn't a problem.
42 get_linux_file_attr = set_linux_file_attr = None
45 # WARNING: the metadata encoding is *not* stable yet. Caveat emptor!
47 # Q: Consider hardlink support?
48 # Q: Is it OK to store raw linux attr (chattr) flags?
49 # Q: Can anything other than S_ISREG(x) or S_ISDIR(x) support posix1e ACLs?
50 # Q: Is the application of posix1e has_extended() correct?
51 # Q: Is one global --numeric-ids argument sufficient?
52 # Q: Do nfsv4 acls trump posix1e acls? (seems likely)
53 # Q: Add support for crtime -- ntfs, and (only internally?) ext*?
55 # FIXME: Fix relative/abs path detection/stripping wrt other platforms.
56 # FIXME: Add nfsv4 acl handling - see nfs4-acl-tools.
57 # FIXME: Consider other entries mentioned in stat(2) (S_IFDOOR, etc.).
58 # FIXME: Consider pack('vvvvsss', ...) optimization.
59 # FIXME: Consider caching users/groups.
63 # osx (varies between hfs and hfs+):
64 # type - regular dir char block fifo socket ...
65 # perms - rwxrwxrwxsgt
66 # times - ctime atime mtime
69 # hard-link-info (hfs+ only)
72 # attributes-osx see chflags
78 # type - regular dir ...
79 # times - creation, modification, posix change, access
82 # attributes - see attrib
84 # forks (alternate data streams)
88 # type - regular dir ...
89 # perms - rwxrwxrwx (maybe - see wikipedia)
90 # times - creation, modification, access
91 # attributes - see attrib
95 _have_lchmod = hasattr(os, 'lchmod')
98 def _clean_up_path_for_archive(p):
99 # Not the most efficient approach.
102 # Take everything after any '/../'.
103 pos = result.rfind('/../')
105 result = result[result.rfind('/../') + 4:]
107 # Take everything after any remaining '../'.
108 if result.startswith("../"):
111 # Remove any '/./' sequences.
112 pos = result.find('/./')
114 result = result[0:pos] + '/' + result[pos + 3:]
115 pos = result.find('/./')
117 # Remove any leading '/'s.
118 result = result.lstrip('/')
120 # Replace '//' with '/' everywhere.
121 pos = result.find('//')
123 result = result[0:pos] + '/' + result[pos + 2:]
124 pos = result.find('//')
126 # Take everything after any remaining './'.
127 if result.startswith('./'):
130 # Take everything before any remaining '/.'.
131 if result.endswith('/.'):
134 if result == '' or result.endswith('/..'):
141 if p.startswith('/'):
143 if p.find('/../') != -1:
145 if p.startswith('../'):
147 if p.endswith('/..'):
152 def _clean_up_extract_path(p):
153 result = p.lstrip('/')
156 elif _risky_path(result):
162 # These tags are currently conceptually private to Metadata, and they
163 # must be unique, and must *never* be changed.
166 _rec_tag_common = 2 # times, user, group, type, perms, etc.
167 _rec_tag_symlink_target = 3
168 _rec_tag_posix1e_acl = 4 # getfacl(1), setfacl(1), etc.
169 _rec_tag_nfsv4_acl = 5 # intended to supplant posix1e acls?
170 _rec_tag_linux_attr = 6 # lsattr(1) chattr(1)
171 _rec_tag_linux_xattr = 7 # getfattr(1) setfattr(1)
172 _rec_tag_hardlink_target = 8 # hard link target path
175 class ApplyError(Exception):
176 # Thrown when unable to apply any given bit of metadata to a path.
181 # Metadata is stored as a sequence of tagged binary records. Each
182 # record will have some subset of add, encode, load, create, and
183 # apply methods, i.e. _add_foo...
185 # We do allow an "empty" object as a special case, i.e. no
186 # records. One can be created by trying to write Metadata(), and
187 # for such an object, read() will return None. This is used by
188 # "bup save", for example, as a placeholder in cases where
191 # NOTE: if any relevant fields are added or removed, be sure to
192 # update same_file() below.
196 # Timestamps are (sec, ns), relative to 1970-01-01 00:00:00, ns
197 # must be non-negative and < 10**9.
199 def _add_common(self, path, st):
202 self.atime = st.st_atime
203 self.mtime = st.st_mtime
204 self.ctime = st.st_ctime
205 self.user = self.group = ''
206 entry = pwd_from_uid(st.st_uid)
208 self.user = entry.pw_name
209 entry = grp_from_gid(st.st_gid)
211 self.group = entry.gr_name
212 self.mode = st.st_mode
213 # Only collect st_rdev if we might need it for a mknod()
214 # during restore. On some platforms (i.e. kFreeBSD), it isn't
215 # stable for other file types. For example "cp -a" will
216 # change it for a plain file.
217 if stat.S_ISCHR(st.st_mode) or stat.S_ISBLK(st.st_mode):
218 self.rdev = st.st_rdev
222 def _same_common(self, other):
223 """Return true or false to indicate similarity in the hardlink sense."""
224 return self.uid == other.uid \
225 and self.gid == other.gid \
226 and self.rdev == other.rdev \
227 and self.atime == other.atime \
228 and self.mtime == other.mtime \
229 and self.ctime == other.ctime \
230 and self.user == other.user \
231 and self.group == other.group
233 def _encode_common(self):
236 atime = xstat.nsecs_to_timespec(self.atime)
237 mtime = xstat.nsecs_to_timespec(self.mtime)
238 ctime = xstat.nsecs_to_timespec(self.ctime)
239 result = vint.pack('VVsVsVvVvVvV',
254 def _load_common_rec(self, port):
255 data = vint.read_bvec(port)
267 ctime_ns) = vint.unpack('VVsVsVvVvVvV', data)
268 self.atime = xstat.timespec_to_nsecs((self.atime, atime_ns))
269 self.mtime = xstat.timespec_to_nsecs((self.mtime, mtime_ns))
270 self.ctime = xstat.timespec_to_nsecs((self.ctime, ctime_ns))
272 def _recognized_file_type(self):
273 return stat.S_ISREG(self.mode) \
274 or stat.S_ISDIR(self.mode) \
275 or stat.S_ISCHR(self.mode) \
276 or stat.S_ISBLK(self.mode) \
277 or stat.S_ISFIFO(self.mode) \
278 or stat.S_ISSOCK(self.mode) \
279 or stat.S_ISLNK(self.mode)
281 def _create_via_common_rec(self, path, create_symlinks=True):
283 raise ApplyError('no metadata - cannot create path ' + path)
285 # If the path already exists and is a dir, try rmdir.
286 # If the path already exists and is anything else, try unlink.
289 st = xstat.lstat(path)
291 if e.errno != errno.ENOENT:
294 if stat.S_ISDIR(st.st_mode):
298 if e.errno in (errno.ENOTEMPTY, errno.EEXIST):
299 msg = 'refusing to overwrite non-empty dir ' + path
305 if stat.S_ISREG(self.mode):
306 assert(self._recognized_file_type())
307 fd = os.open(path, os.O_CREAT|os.O_WRONLY|os.O_EXCL, 0600)
309 elif stat.S_ISDIR(self.mode):
310 assert(self._recognized_file_type())
312 elif stat.S_ISCHR(self.mode):
313 assert(self._recognized_file_type())
314 os.mknod(path, 0600 | stat.S_IFCHR, self.rdev)
315 elif stat.S_ISBLK(self.mode):
316 assert(self._recognized_file_type())
317 os.mknod(path, 0600 | stat.S_IFBLK, self.rdev)
318 elif stat.S_ISFIFO(self.mode):
319 assert(self._recognized_file_type())
320 os.mknod(path, 0600 | stat.S_IFIFO)
321 elif stat.S_ISSOCK(self.mode):
323 os.mknod(path, 0600 | stat.S_IFSOCK)
325 if e.errno == errno.EINVAL:
326 s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
330 elif stat.S_ISLNK(self.mode):
331 assert(self._recognized_file_type())
332 if self.symlink_target and create_symlinks:
333 # on MacOS, symlink() permissions depend on umask, and there's
334 # no way to chown a symlink after creating it, so we have to
336 oldumask = os.umask((self.mode & 0777) ^ 0777)
338 os.symlink(self.symlink_target, path)
341 # FIXME: S_ISDOOR, S_IFMPB, S_IFCMP, S_IFNWK, ... see stat(2).
343 assert(not self._recognized_file_type())
344 add_error('not creating "%s" with unrecognized mode "0x%x"\n'
347 def _apply_common_rec(self, path, restore_numeric_ids=False):
349 raise ApplyError('no metadata - cannot apply to ' + path)
351 # FIXME: S_ISDOOR, S_IFMPB, S_IFCMP, S_IFNWK, ... see stat(2).
352 # EACCES errors at this stage are fatal for the current path.
353 if lutime and stat.S_ISLNK(self.mode):
355 lutime(path, (self.atime, self.mtime))
357 if e.errno == errno.EACCES:
358 raise ApplyError('lutime: %s' % e)
363 utime(path, (self.atime, self.mtime))
365 if e.errno == errno.EACCES:
366 raise ApplyError('utime: %s' % e)
370 # Implement tar/rsync-like semantics; see bup-restore(1).
371 # FIXME: should we consider caching user/group name <-> id
372 # mappings, getgroups(), etc.?
373 uid = gid = -1 # By default, do nothing.
377 if not restore_numeric_ids:
378 if self.uid != 0 and self.user:
379 entry = pwd_from_name(self.user)
382 if self.gid != 0 and self.group:
383 entry = grp_from_name(self.group)
386 else: # not superuser - only consider changing the group/gid
387 user_gids = os.getgroups()
388 if self.gid in user_gids:
390 if not restore_numeric_ids and self.gid != 0:
391 # The grp might not exist on the local system.
392 grps = filter(None, [grp_from_gid(x) for x in user_gids])
393 if self.group in [x.gr_name for x in grps]:
394 g = grp_from_name(self.group)
398 if uid != -1 or gid != -1:
400 os.lchown(path, uid, gid)
402 if e.errno == errno.EPERM:
403 add_error('lchown: %s' % e)
404 elif sys.platform.startswith('cygwin') \
405 and e.errno == errno.EINVAL:
406 add_error('lchown: unknown uid/gid (%d/%d) for %s'
412 os.lchmod(path, stat.S_IMODE(self.mode))
413 elif not stat.S_ISLNK(self.mode):
414 os.chmod(path, stat.S_IMODE(self.mode))
419 def _encode_path(self):
421 return vint.pack('s', self.path)
425 def _load_path_rec(self, port):
426 self.path = vint.unpack('s', vint.read_bvec(port))[0]
431 def _add_symlink_target(self, path, st):
433 if stat.S_ISLNK(st.st_mode):
434 self.symlink_target = os.readlink(path)
436 add_error('readlink: %s', e)
438 def _encode_symlink_target(self):
439 return self.symlink_target
441 def _load_symlink_target_rec(self, port):
442 self.symlink_target = vint.read_bvec(port)
447 def _add_hardlink_target(self, target):
448 self.hardlink_target = target
450 def _same_hardlink_target(self, other):
451 """Return true or false to indicate similarity in the hardlink sense."""
452 return self.hardlink_target == other.hardlink_target
454 def _encode_hardlink_target(self):
455 return self.hardlink_target
457 def _load_hardlink_target_rec(self, port):
458 self.hardlink_target = vint.read_bvec(port)
461 ## POSIX1e ACL records
463 # Recorded as a list:
464 # [txt_id_acl, num_id_acl]
465 # or, if a directory:
466 # [txt_id_acl, num_id_acl, txt_id_default_acl, num_id_default_acl]
467 # The numeric/text distinction only matters when reading/restoring
469 def _add_posix1e_acl(self, path, st):
470 if not posix1e: return
471 if not stat.S_ISLNK(st.st_mode):
473 if posix1e.has_extended(path):
474 acl = posix1e.ACL(file=path)
475 self.posix1e_acl = [acl, acl] # txt and num are the same
476 if stat.S_ISDIR(st.st_mode):
477 acl = posix1e.ACL(filedef=path)
478 self.posix1e_acl.extend([acl, acl])
479 except EnvironmentError, e:
480 if e.errno not in (errno.EOPNOTSUPP, errno.ENOSYS):
483 def _same_posix1e_acl(self, other):
484 """Return true or false to indicate similarity in the hardlink sense."""
485 return self.posix1e_acl == other.posix1e_acl
487 def _encode_posix1e_acl(self):
488 # Encode as two strings (w/default ACL string possibly empty).
490 acls = self.posix1e_acl
491 txt_flags = posix1e.TEXT_ABBREVIATE
492 num_flags = posix1e.TEXT_ABBREVIATE | posix1e.TEXT_NUMERIC_IDS
493 acl_reps = [acls[0].to_any_text('', '\n', txt_flags),
494 acls[1].to_any_text('', '\n', num_flags)]
498 acl_reps.append(acls[2].to_any_text('', '\n', txt_flags))
499 acl_reps.append(acls[3].to_any_text('', '\n', num_flags))
500 return vint.pack('ssss',
501 acl_reps[0], acl_reps[1], acl_reps[2], acl_reps[3])
505 def _load_posix1e_acl_rec(self, port):
506 if not posix1e: return
507 data = vint.read_bvec(port)
508 acl_reps = vint.unpack('ssss', data)
509 if acl_reps[2] == '':
510 acl_reps = acl_reps[:2]
511 self.posix1e_acl = [posix1e.ACL(text=x) for x in acl_reps]
513 def _apply_posix1e_acl_rec(self, path, restore_numeric_ids=False):
514 def apply_acl(acl, kind):
516 acl.applyto(path, kind)
518 if e.errno == errno.EPERM or e.errno == errno.EOPNOTSUPP:
519 raise ApplyError('POSIX1e ACL applyto: %s' % e)
525 add_error("%s: can't restore ACLs; posix1e support missing.\n"
529 acls = self.posix1e_acl
531 if restore_numeric_ids:
532 apply_acl(acls[3], posix1e.ACL_TYPE_DEFAULT)
534 apply_acl(acls[2], posix1e.ACL_TYPE_DEFAULT)
535 if restore_numeric_ids:
536 apply_acl(acls[1], posix1e.ACL_TYPE_ACCESS)
538 apply_acl(acls[0], posix1e.ACL_TYPE_ACCESS)
541 ## Linux attributes (lsattr(1), chattr(1))
543 def _add_linux_attr(self, path, st):
544 if not get_linux_file_attr: return
545 if stat.S_ISREG(st.st_mode) or stat.S_ISDIR(st.st_mode):
547 attr = get_linux_file_attr(path)
549 self.linux_attr = attr
551 if e.errno == errno.EACCES:
552 add_error('read Linux attr: %s' % e)
553 elif e.errno == errno.ENOTTY or e.errno == errno.ENOSYS:
554 # ENOTTY: Function not implemented.
555 # ENOSYS: Inappropriate ioctl for device.
556 # Assume filesystem doesn't support attrs.
561 def _same_linux_attr(self, other):
562 """Return true or false to indicate similarity in the hardlink sense."""
563 return self.linux_attr == other.linux_attr
565 def _encode_linux_attr(self):
567 return vint.pack('V', self.linux_attr)
571 def _load_linux_attr_rec(self, port):
572 data = vint.read_bvec(port)
573 self.linux_attr = vint.unpack('V', data)[0]
575 def _apply_linux_attr_rec(self, path, restore_numeric_ids=False):
577 if not set_linux_file_attr:
578 add_error("%s: can't restore linuxattrs: "
579 "linuxattr support missing.\n" % path)
582 set_linux_file_attr(path, self.linux_attr)
584 if e.errno in (errno.ENOTTY, errno.EOPNOTSUPP, errno.ENOSYS):
585 raise ApplyError('Linux chattr: %s' % e)
590 ## Linux extended attributes (getfattr(1), setfattr(1))
592 def _add_linux_xattr(self, path, st):
595 self.linux_xattr = xattr.get_all(path, nofollow=True)
596 except EnvironmentError, e:
597 if e.errno != errno.EOPNOTSUPP:
600 def _same_linux_xattr(self, other):
601 """Return true or false to indicate similarity in the hardlink sense."""
602 return self.linux_xattr == other.linux_xattr
604 def _encode_linux_xattr(self):
606 result = vint.pack('V', len(self.linux_xattr))
607 for name, value in self.linux_xattr:
608 result += vint.pack('ss', name, value)
613 def _load_linux_xattr_rec(self, file):
614 data = vint.read_bvec(file)
615 memfile = StringIO(data)
617 for i in range(vint.read_vuint(memfile)):
618 key = vint.read_bvec(memfile)
619 value = vint.read_bvec(memfile)
620 result.append((key, value))
621 self.linux_xattr = result
623 def _apply_linux_xattr_rec(self, path, restore_numeric_ids=False):
626 add_error("%s: can't restore xattr; xattr support missing.\n"
629 existing_xattrs = set(xattr.list(path, nofollow=True))
631 for k, v in self.linux_xattr:
632 if k not in existing_xattrs \
633 or v != xattr.get(path, k, nofollow=True):
635 xattr.set(path, k, v, nofollow=True)
637 if e.errno == errno.EPERM \
638 or e.errno == errno.EOPNOTSUPP:
639 raise ApplyError('xattr.set: %s' % e)
642 existing_xattrs -= frozenset([k])
643 for k in existing_xattrs:
645 xattr.remove(path, k, nofollow=True)
647 if e.errno == errno.EPERM:
648 raise ApplyError('xattr.remove: %s' % e)
657 self.symlink_target = None
658 self.hardlink_target = None
659 self.linux_attr = None
660 self.linux_xattr = None
661 self.posix1e_acl = None
662 self.posix1e_acl_default = None
664 def write(self, port, include_path=True):
665 records = include_path and [(_rec_tag_path, self._encode_path())] or []
666 records.extend([(_rec_tag_common, self._encode_common()),
667 (_rec_tag_symlink_target,
668 self._encode_symlink_target()),
669 (_rec_tag_hardlink_target,
670 self._encode_hardlink_target()),
671 (_rec_tag_posix1e_acl, self._encode_posix1e_acl()),
672 (_rec_tag_linux_attr, self._encode_linux_attr()),
673 (_rec_tag_linux_xattr, self._encode_linux_xattr())])
674 for tag, data in records:
676 vint.write_vuint(port, tag)
677 vint.write_bvec(port, data)
678 vint.write_vuint(port, _rec_tag_end)
680 def encode(self, include_path=True):
682 self.write(port, include_path)
683 return port.getvalue()
687 # This method should either return a valid Metadata object,
688 # return None if there was no information at all (just a
689 # _rec_tag_end), throw EOFError if there was nothing at all to
690 # read, or throw an Exception if a valid object could not be
692 tag = vint.read_vuint(port)
693 if tag == _rec_tag_end:
695 try: # From here on, EOF is an error.
697 while True: # only exit is error (exception) or _rec_tag_end
698 if tag == _rec_tag_path:
699 result._load_path_rec(port)
700 elif tag == _rec_tag_common:
701 result._load_common_rec(port)
702 elif tag == _rec_tag_symlink_target:
703 result._load_symlink_target_rec(port)
704 elif tag == _rec_tag_hardlink_target:
705 result._load_hardlink_target_rec(port)
706 elif tag == _rec_tag_posix1e_acl:
707 result._load_posix1e_acl_rec(port)
708 elif tag == _rec_tag_nfsv4_acl:
709 result._load_nfsv4_acl_rec(port)
710 elif tag == _rec_tag_linux_attr:
711 result._load_linux_attr_rec(port)
712 elif tag == _rec_tag_linux_xattr:
713 result._load_linux_xattr_rec(port)
714 elif tag == _rec_tag_end:
716 else: # unknown record
718 tag = vint.read_vuint(port)
720 raise Exception("EOF while reading Metadata")
723 return stat.S_ISDIR(self.mode)
725 def create_path(self, path, create_symlinks=True):
726 self._create_via_common_rec(path, create_symlinks=create_symlinks)
728 def apply_to_path(self, path=None, restore_numeric_ids=False):
729 # apply metadata to path -- file must exist
733 raise Exception('Metadata.apply_to_path() called with no path')
734 if not self._recognized_file_type():
735 add_error('not applying metadata to "%s"' % path
736 + ' with unrecognized mode "0x%x"\n' % self.mode)
738 num_ids = restore_numeric_ids
740 self._apply_common_rec(path, restore_numeric_ids=num_ids)
741 self._apply_posix1e_acl_rec(path, restore_numeric_ids=num_ids)
742 self._apply_linux_attr_rec(path, restore_numeric_ids=num_ids)
743 self._apply_linux_xattr_rec(path, restore_numeric_ids=num_ids)
744 except ApplyError, e:
747 def same_file(self, other):
748 """Compare this to other for equivalency. Return true if
749 their information implies they could represent the same file
750 on disk, in the hardlink sense. Assume they're both regular
752 return self._same_common(other) \
753 and self._same_hardlink_target(other) \
754 and self._same_posix1e_acl(other) \
755 and self._same_linux_attr(other) \
756 and self._same_linux_xattr(other)
759 def from_path(path, statinfo=None, archive_path=None,
760 save_symlinks=True, hardlink_target=None):
762 result.path = archive_path
763 st = statinfo or xstat.lstat(path)
764 result.size = st.st_size
765 result._add_common(path, st)
767 result._add_symlink_target(path, st)
768 result._add_hardlink_target(hardlink_target)
769 result._add_posix1e_acl(path, st)
770 result._add_linux_attr(path, st)
771 result._add_linux_xattr(path, st)
775 def save_tree(output_file, paths,
781 # Issue top-level rewrite warnings.
783 safe_path = _clean_up_path_for_archive(path)
784 if safe_path != path:
785 log('archiving "%s" as "%s"\n' % (path, safe_path))
787 start_dir = os.getcwd()
789 for (p, st) in recursive_dirlist(paths, xdev=xdev):
790 dirlist_dir = os.getcwd()
792 safe_path = _clean_up_path_for_archive(p)
793 m = from_path(p, statinfo=st, archive_path=safe_path,
794 save_symlinks=save_symlinks)
796 print >> sys.stderr, m.path
797 m.write(output_file, include_path=write_paths)
798 os.chdir(dirlist_dir)
803 def _set_up_path(meta, create_symlinks=True):
804 # Allow directories to exist as a special case -- might have
805 # been created by an earlier longer path.
809 parent = os.path.dirname(meta.path)
812 meta.create_path(meta.path, create_symlinks=create_symlinks)
815 all_fields = frozenset(['path',
832 def summary_str(meta):
833 mode_val = xstat.mode_str(meta.mode)
836 user_val = str(meta.uid)
837 group_val = meta.group
839 group_val = str(meta.gid)
840 size_or_dev_val = '-'
841 if stat.S_ISCHR(meta.mode) or stat.S_ISBLK(meta.mode):
842 size_or_dev_val = '%d,%d' % (os.major(meta.rdev), os.minor(meta.rdev))
844 size_or_dev_val = meta.size
845 mtime_secs = xstat.fstime_floor_secs(meta.mtime)
846 time_val = time.strftime('%Y-%m-%d %H:%M', time.localtime(mtime_secs))
847 path_val = meta.path or ''
848 if stat.S_ISLNK(meta.mode):
849 path_val += ' -> ' + meta.symlink_target
850 return '%-10s %-11s %11s %16s %s' % (mode_val,
851 user_val + "/" + group_val,
857 def detailed_str(meta, fields = None):
858 # FIXME: should optional fields be omitted, or empty i.e. "rdev:
859 # 0", "link-target:", etc.
865 path = meta.path or ''
866 result.append('path: ' + path)
868 result.append('mode: %s (%s)' % (oct(meta.mode),
869 xstat.mode_str(meta.mode)))
870 if 'link-target' in fields and stat.S_ISLNK(meta.mode):
871 result.append('link-target: ' + meta.symlink_target)
874 result.append('rdev: %d,%d' % (os.major(meta.rdev),
875 os.minor(meta.rdev)))
877 result.append('rdev: 0')
878 if 'size' in fields and meta.size:
879 result.append('size: ' + str(meta.size))
881 result.append('uid: ' + str(meta.uid))
883 result.append('gid: ' + str(meta.gid))
885 result.append('user: ' + meta.user)
886 if 'group' in fields:
887 result.append('group: ' + meta.group)
888 if 'atime' in fields:
889 # If we don't have xstat.lutime, that means we have to use
890 # utime(), and utime() has no way to set the mtime/atime of a
891 # symlink. Thus, the mtime/atime of a symlink is meaningless,
892 # so let's not report it. (That way scripts comparing
893 # before/after won't trigger.)
894 if xstat.lutime or not stat.S_ISLNK(meta.mode):
895 result.append('atime: ' + xstat.fstime_to_sec_str(meta.atime))
897 result.append('atime: 0')
898 if 'mtime' in fields:
899 if xstat.lutime or not stat.S_ISLNK(meta.mode):
900 result.append('mtime: ' + xstat.fstime_to_sec_str(meta.mtime))
902 result.append('mtime: 0')
903 if 'ctime' in fields:
904 result.append('ctime: ' + xstat.fstime_to_sec_str(meta.ctime))
905 if 'linux-attr' in fields and meta.linux_attr:
906 result.append('linux-attr: ' + hex(meta.linux_attr))
907 if 'linux-xattr' in fields and meta.linux_xattr:
908 for name, value in meta.linux_xattr:
909 result.append('linux-xattr: %s -> %s' % (name, repr(value)))
910 if 'posix1e-acl' in fields and meta.posix1e_acl and posix1e:
911 flags = posix1e.TEXT_ABBREVIATE
912 if stat.S_ISDIR(meta.mode):
913 acl = meta.posix1e_acl[0]
914 default_acl = meta.posix1e_acl[2]
915 result.append(acl.to_any_text('posix1e-acl: ', '\n', flags))
916 result.append(acl.to_any_text('posix1e-acl-default: ', '\n', flags))
918 acl = meta.posix1e_acl[0]
919 result.append(acl.to_any_text('posix1e-acl: ', '\n', flags))
920 return '\n'.join(result)
923 class _ArchiveIterator:
926 return Metadata.read(self._file)
928 raise StopIteration()
933 def __init__(self, file):
937 def display_archive(file):
940 for meta in _ArchiveIterator(file):
943 print detailed_str(meta)
946 for meta in _ArchiveIterator(file):
947 print summary_str(meta)
949 for meta in _ArchiveIterator(file):
951 print >> sys.stderr, \
952 'bup: no metadata path, but asked to only display path', \
953 '(increase verbosity?)'
958 def start_extract(file, create_symlinks=True):
959 for meta in _ArchiveIterator(file):
960 if not meta: # Hit end record.
963 print >> sys.stderr, meta.path
964 xpath = _clean_up_extract_path(meta.path)
966 add_error(Exception('skipping risky path "%s"' % meta.path))
969 _set_up_path(meta, create_symlinks=create_symlinks)
972 def finish_extract(file, restore_numeric_ids=False):
974 for meta in _ArchiveIterator(file):
975 if not meta: # Hit end record.
977 xpath = _clean_up_extract_path(meta.path)
979 add_error(Exception('skipping risky path "%s"' % dir.path))
981 if os.path.isdir(meta.path):
982 all_dirs.append(meta)
985 print >> sys.stderr, meta.path
986 meta.apply_to_path(path=xpath,
987 restore_numeric_ids=restore_numeric_ids)
988 all_dirs.sort(key = lambda x : len(x.path), reverse=True)
990 # Don't need to check xpath -- won't be in all_dirs if not OK.
991 xpath = _clean_up_extract_path(dir.path)
993 print >> sys.stderr, dir.path
994 dir.apply_to_path(path=xpath, restore_numeric_ids=restore_numeric_ids)
997 def extract(file, restore_numeric_ids=False, create_symlinks=True):
998 # For now, just store all the directories and handle them last,
1001 for meta in _ArchiveIterator(file):
1002 if not meta: # Hit end record.
1004 xpath = _clean_up_extract_path(meta.path)
1006 add_error(Exception('skipping risky path "%s"' % meta.path))
1010 print >> sys.stderr, '+', meta.path
1011 _set_up_path(meta, create_symlinks=create_symlinks)
1012 if os.path.isdir(meta.path):
1013 all_dirs.append(meta)
1016 print >> sys.stderr, '=', meta.path
1017 meta.apply_to_path(restore_numeric_ids=restore_numeric_ids)
1018 all_dirs.sort(key = lambda x : len(x.path), reverse=True)
1019 for dir in all_dirs:
1020 # Don't need to check xpath -- won't be in all_dirs if not OK.
1021 xpath = _clean_up_extract_path(dir.path)
1023 print >> sys.stderr, '=', xpath
1024 # Shouldn't have to check for risky paths here (omitted above).
1025 dir.apply_to_path(path=dir.path,
1026 restore_numeric_ids=restore_numeric_ids)