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? (unimplemented)
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 in (errno.EINVAL, errno.EPERM):
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):
475 if posix1e.has_extended(path):
476 acl = posix1e.ACL(file=path)
477 acls = [acl, acl] # txt and num are the same
478 if stat.S_ISDIR(st.st_mode):
479 def_acl = posix1e.ACL(filedef=path)
480 def_acls = [def_acl, def_acl]
481 except EnvironmentError, e:
482 if e.errno not in (errno.EOPNOTSUPP, errno.ENOSYS):
485 txt_flags = posix1e.TEXT_ABBREVIATE
486 num_flags = posix1e.TEXT_ABBREVIATE | posix1e.TEXT_NUMERIC_IDS
487 acl_rep = [acls[0].to_any_text('', '\n', txt_flags),
488 acls[1].to_any_text('', '\n', num_flags)]
490 acl_rep.append(def_acls[0].to_any_text('', '\n', txt_flags))
491 acl_rep.append(def_acls[1].to_any_text('', '\n', num_flags))
492 self.posix1e_acl = acl_rep
494 def _same_posix1e_acl(self, other):
495 """Return true or false to indicate similarity in the hardlink sense."""
496 return self.posix1e_acl == other.posix1e_acl
498 def _encode_posix1e_acl(self):
499 # Encode as two strings (w/default ACL string possibly empty).
501 acls = self.posix1e_acl
503 acls.extend(['', ''])
504 return vint.pack('ssss', acls[0], acls[1], acls[2], acls[3])
508 def _load_posix1e_acl_rec(self, port):
509 acl_rep = vint.unpack('ssss', vint.read_bvec(port))
511 acl_rep = acl_rep[:2]
512 self.posix1e_acl = acl_rep
514 def _apply_posix1e_acl_rec(self, path, restore_numeric_ids=False):
515 def apply_acl(acl_rep, kind):
517 acl = posix1e.ACL(text = acl_rep)
520 # pylibacl appears to return an IOError with errno
521 # set to 0 if a group referred to by the ACL rep
522 # doesn't exist on the current system.
523 raise ApplyError("POSIX1e ACL: can't create %r for %r"
528 acl.applyto(path, kind)
530 if e.errno == errno.EPERM or e.errno == errno.EOPNOTSUPP:
531 raise ApplyError('POSIX1e ACL applyto: %s' % e)
537 add_error("%s: can't restore ACLs; posix1e support missing.\n"
541 acls = self.posix1e_acl
543 if restore_numeric_ids:
544 apply_acl(acls[3], posix1e.ACL_TYPE_DEFAULT)
546 apply_acl(acls[2], posix1e.ACL_TYPE_DEFAULT)
547 if restore_numeric_ids:
548 apply_acl(acls[1], posix1e.ACL_TYPE_ACCESS)
550 apply_acl(acls[0], posix1e.ACL_TYPE_ACCESS)
553 ## Linux attributes (lsattr(1), chattr(1))
555 def _add_linux_attr(self, path, st):
556 if not get_linux_file_attr: return
557 if stat.S_ISREG(st.st_mode) or stat.S_ISDIR(st.st_mode):
559 attr = get_linux_file_attr(path)
561 self.linux_attr = attr
563 if e.errno == errno.EACCES:
564 add_error('read Linux attr: %s' % e)
565 elif e.errno in (errno.ENOTTY, errno.ENOSYS, errno.EOPNOTSUPP):
566 # Assume filesystem doesn't support attrs.
571 def _same_linux_attr(self, other):
572 """Return true or false to indicate similarity in the hardlink sense."""
573 return self.linux_attr == other.linux_attr
575 def _encode_linux_attr(self):
577 return vint.pack('V', self.linux_attr)
581 def _load_linux_attr_rec(self, port):
582 data = vint.read_bvec(port)
583 self.linux_attr = vint.unpack('V', data)[0]
585 def _apply_linux_attr_rec(self, path, restore_numeric_ids=False):
587 if not set_linux_file_attr:
588 add_error("%s: can't restore linuxattrs: "
589 "linuxattr support missing.\n" % path)
592 set_linux_file_attr(path, self.linux_attr)
594 if e.errno in (errno.ENOTTY, errno.EOPNOTSUPP, errno.ENOSYS,
596 raise ApplyError('Linux chattr: %s' % e)
601 ## Linux extended attributes (getfattr(1), setfattr(1))
603 def _add_linux_xattr(self, path, st):
606 self.linux_xattr = xattr.get_all(path, nofollow=True)
607 except EnvironmentError, e:
608 if e.errno != errno.EOPNOTSUPP:
611 def _same_linux_xattr(self, other):
612 """Return true or false to indicate similarity in the hardlink sense."""
613 return self.linux_xattr == other.linux_xattr
615 def _encode_linux_xattr(self):
617 result = vint.pack('V', len(self.linux_xattr))
618 for name, value in self.linux_xattr:
619 result += vint.pack('ss', name, value)
624 def _load_linux_xattr_rec(self, file):
625 data = vint.read_bvec(file)
626 memfile = StringIO(data)
628 for i in range(vint.read_vuint(memfile)):
629 key = vint.read_bvec(memfile)
630 value = vint.read_bvec(memfile)
631 result.append((key, value))
632 self.linux_xattr = result
634 def _apply_linux_xattr_rec(self, path, restore_numeric_ids=False):
637 add_error("%s: can't restore xattr; xattr support missing.\n"
641 existing_xattrs = set(xattr.list(path, nofollow=True))
643 if e.errno == errno.EACCES:
644 raise ApplyError('xattr.set: %s' % e)
648 for k, v in self.linux_xattr:
649 if k not in existing_xattrs \
650 or v != xattr.get(path, k, nofollow=True):
652 xattr.set(path, k, v, nofollow=True)
654 if e.errno == errno.EPERM \
655 or e.errno == errno.EOPNOTSUPP:
656 raise ApplyError('xattr.set: %s' % e)
659 existing_xattrs -= frozenset([k])
660 for k in existing_xattrs:
662 xattr.remove(path, k, nofollow=True)
664 if e.errno == errno.EPERM:
665 raise ApplyError('xattr.remove: %s' % e)
674 self.symlink_target = None
675 self.hardlink_target = None
676 self.linux_attr = None
677 self.linux_xattr = None
678 self.posix1e_acl = None
680 def write(self, port, include_path=True):
681 records = include_path and [(_rec_tag_path, self._encode_path())] or []
682 records.extend([(_rec_tag_common, self._encode_common()),
683 (_rec_tag_symlink_target,
684 self._encode_symlink_target()),
685 (_rec_tag_hardlink_target,
686 self._encode_hardlink_target()),
687 (_rec_tag_posix1e_acl, self._encode_posix1e_acl()),
688 (_rec_tag_linux_attr, self._encode_linux_attr()),
689 (_rec_tag_linux_xattr, self._encode_linux_xattr())])
690 for tag, data in records:
692 vint.write_vuint(port, tag)
693 vint.write_bvec(port, data)
694 vint.write_vuint(port, _rec_tag_end)
696 def encode(self, include_path=True):
698 self.write(port, include_path)
699 return port.getvalue()
703 # This method should either return a valid Metadata object,
704 # return None if there was no information at all (just a
705 # _rec_tag_end), throw EOFError if there was nothing at all to
706 # read, or throw an Exception if a valid object could not be
708 tag = vint.read_vuint(port)
709 if tag == _rec_tag_end:
711 try: # From here on, EOF is an error.
713 while True: # only exit is error (exception) or _rec_tag_end
714 if tag == _rec_tag_path:
715 result._load_path_rec(port)
716 elif tag == _rec_tag_common:
717 result._load_common_rec(port)
718 elif tag == _rec_tag_symlink_target:
719 result._load_symlink_target_rec(port)
720 elif tag == _rec_tag_hardlink_target:
721 result._load_hardlink_target_rec(port)
722 elif tag == _rec_tag_posix1e_acl:
723 result._load_posix1e_acl_rec(port)
724 elif tag == _rec_tag_linux_attr:
725 result._load_linux_attr_rec(port)
726 elif tag == _rec_tag_linux_xattr:
727 result._load_linux_xattr_rec(port)
728 elif tag == _rec_tag_end:
730 else: # unknown record
732 tag = vint.read_vuint(port)
734 raise Exception("EOF while reading Metadata")
737 return stat.S_ISDIR(self.mode)
739 def create_path(self, path, create_symlinks=True):
740 self._create_via_common_rec(path, create_symlinks=create_symlinks)
742 def apply_to_path(self, path=None, restore_numeric_ids=False):
743 # apply metadata to path -- file must exist
747 raise Exception('Metadata.apply_to_path() called with no path')
748 if not self._recognized_file_type():
749 add_error('not applying metadata to "%s"' % path
750 + ' with unrecognized mode "0x%x"\n' % self.mode)
752 num_ids = restore_numeric_ids
753 for apply_metadata in (self._apply_common_rec,
754 self._apply_posix1e_acl_rec,
755 self._apply_linux_attr_rec,
756 self._apply_linux_xattr_rec):
758 apply_metadata(path, restore_numeric_ids=num_ids)
759 except ApplyError, e:
762 def same_file(self, other):
763 """Compare this to other for equivalency. Return true if
764 their information implies they could represent the same file
765 on disk, in the hardlink sense. Assume they're both regular
767 return self._same_common(other) \
768 and self._same_hardlink_target(other) \
769 and self._same_posix1e_acl(other) \
770 and self._same_linux_attr(other) \
771 and self._same_linux_xattr(other)
774 def from_path(path, statinfo=None, archive_path=None,
775 save_symlinks=True, hardlink_target=None):
777 result.path = archive_path
778 st = statinfo or xstat.lstat(path)
779 result.size = st.st_size
780 result._add_common(path, st)
782 result._add_symlink_target(path, st)
783 result._add_hardlink_target(hardlink_target)
784 result._add_posix1e_acl(path, st)
785 result._add_linux_attr(path, st)
786 result._add_linux_xattr(path, st)
790 def save_tree(output_file, paths,
796 # Issue top-level rewrite warnings.
798 safe_path = _clean_up_path_for_archive(path)
799 if safe_path != path:
800 log('archiving "%s" as "%s"\n' % (path, safe_path))
804 safe_path = _clean_up_path_for_archive(p)
806 if stat.S_ISDIR(st.st_mode):
808 m = from_path(p, statinfo=st, archive_path=safe_path,
809 save_symlinks=save_symlinks)
811 print >> sys.stderr, m.path
812 m.write(output_file, include_path=write_paths)
814 start_dir = os.getcwd()
816 for (p, st) in recursive_dirlist(paths, xdev=xdev):
817 dirlist_dir = os.getcwd()
819 safe_path = _clean_up_path_for_archive(p)
820 m = from_path(p, statinfo=st, archive_path=safe_path,
821 save_symlinks=save_symlinks)
823 print >> sys.stderr, m.path
824 m.write(output_file, include_path=write_paths)
825 os.chdir(dirlist_dir)
830 def _set_up_path(meta, create_symlinks=True):
831 # Allow directories to exist as a special case -- might have
832 # been created by an earlier longer path.
836 parent = os.path.dirname(meta.path)
839 meta.create_path(meta.path, create_symlinks=create_symlinks)
842 all_fields = frozenset(['path',
859 def summary_str(meta):
860 mode_val = xstat.mode_str(meta.mode)
863 user_val = str(meta.uid)
864 group_val = meta.group
866 group_val = str(meta.gid)
867 size_or_dev_val = '-'
868 if stat.S_ISCHR(meta.mode) or stat.S_ISBLK(meta.mode):
869 size_or_dev_val = '%d,%d' % (os.major(meta.rdev), os.minor(meta.rdev))
871 size_or_dev_val = meta.size
872 mtime_secs = xstat.fstime_floor_secs(meta.mtime)
873 time_val = time.strftime('%Y-%m-%d %H:%M', time.localtime(mtime_secs))
874 path_val = meta.path or ''
875 if stat.S_ISLNK(meta.mode):
876 path_val += ' -> ' + meta.symlink_target
877 return '%-10s %-11s %11s %16s %s' % (mode_val,
878 user_val + "/" + group_val,
884 def detailed_str(meta, fields = None):
885 # FIXME: should optional fields be omitted, or empty i.e. "rdev:
886 # 0", "link-target:", etc.
892 path = meta.path or ''
893 result.append('path: ' + path)
895 result.append('mode: %s (%s)' % (oct(meta.mode),
896 xstat.mode_str(meta.mode)))
897 if 'link-target' in fields and stat.S_ISLNK(meta.mode):
898 result.append('link-target: ' + meta.symlink_target)
901 result.append('rdev: %d,%d' % (os.major(meta.rdev),
902 os.minor(meta.rdev)))
904 result.append('rdev: 0')
905 if 'size' in fields and meta.size:
906 result.append('size: ' + str(meta.size))
908 result.append('uid: ' + str(meta.uid))
910 result.append('gid: ' + str(meta.gid))
912 result.append('user: ' + meta.user)
913 if 'group' in fields:
914 result.append('group: ' + meta.group)
915 if 'atime' in fields:
916 # If we don't have xstat.lutime, that means we have to use
917 # utime(), and utime() has no way to set the mtime/atime of a
918 # symlink. Thus, the mtime/atime of a symlink is meaningless,
919 # so let's not report it. (That way scripts comparing
920 # before/after won't trigger.)
921 if xstat.lutime or not stat.S_ISLNK(meta.mode):
922 result.append('atime: ' + xstat.fstime_to_sec_str(meta.atime))
924 result.append('atime: 0')
925 if 'mtime' in fields:
926 if xstat.lutime or not stat.S_ISLNK(meta.mode):
927 result.append('mtime: ' + xstat.fstime_to_sec_str(meta.mtime))
929 result.append('mtime: 0')
930 if 'ctime' in fields:
931 result.append('ctime: ' + xstat.fstime_to_sec_str(meta.ctime))
932 if 'linux-attr' in fields and meta.linux_attr:
933 result.append('linux-attr: ' + hex(meta.linux_attr))
934 if 'linux-xattr' in fields and meta.linux_xattr:
935 for name, value in meta.linux_xattr:
936 result.append('linux-xattr: %s -> %s' % (name, repr(value)))
937 if 'posix1e-acl' in fields and meta.posix1e_acl:
938 acl = meta.posix1e_acl[0]
939 result.append('posix1e-acl: ' + acl + '\n')
940 if stat.S_ISDIR(meta.mode):
941 def_acl = meta.posix1e_acl[2]
942 result.append('posix1e-acl-default: ' + def_acl + '\n')
943 return '\n'.join(result)
946 class _ArchiveIterator:
949 return Metadata.read(self._file)
951 raise StopIteration()
956 def __init__(self, file):
960 def display_archive(file):
963 for meta in _ArchiveIterator(file):
966 print detailed_str(meta)
969 for meta in _ArchiveIterator(file):
970 print summary_str(meta)
972 for meta in _ArchiveIterator(file):
974 print >> sys.stderr, \
975 'bup: no metadata path, but asked to only display path', \
976 '(increase verbosity?)'
981 def start_extract(file, create_symlinks=True):
982 for meta in _ArchiveIterator(file):
983 if not meta: # Hit end record.
986 print >> sys.stderr, meta.path
987 xpath = _clean_up_extract_path(meta.path)
989 add_error(Exception('skipping risky path "%s"' % meta.path))
992 _set_up_path(meta, create_symlinks=create_symlinks)
995 def finish_extract(file, restore_numeric_ids=False):
997 for meta in _ArchiveIterator(file):
998 if not meta: # Hit end record.
1000 xpath = _clean_up_extract_path(meta.path)
1002 add_error(Exception('skipping risky path "%s"' % dir.path))
1004 if os.path.isdir(meta.path):
1005 all_dirs.append(meta)
1008 print >> sys.stderr, meta.path
1009 meta.apply_to_path(path=xpath,
1010 restore_numeric_ids=restore_numeric_ids)
1011 all_dirs.sort(key = lambda x : len(x.path), reverse=True)
1012 for dir in all_dirs:
1013 # Don't need to check xpath -- won't be in all_dirs if not OK.
1014 xpath = _clean_up_extract_path(dir.path)
1016 print >> sys.stderr, dir.path
1017 dir.apply_to_path(path=xpath, restore_numeric_ids=restore_numeric_ids)
1020 def extract(file, restore_numeric_ids=False, create_symlinks=True):
1021 # For now, just store all the directories and handle them last,
1024 for meta in _ArchiveIterator(file):
1025 if not meta: # Hit end record.
1027 xpath = _clean_up_extract_path(meta.path)
1029 add_error(Exception('skipping risky path "%s"' % meta.path))
1033 print >> sys.stderr, '+', meta.path
1034 _set_up_path(meta, create_symlinks=create_symlinks)
1035 if os.path.isdir(meta.path):
1036 all_dirs.append(meta)
1039 print >> sys.stderr, '=', meta.path
1040 meta.apply_to_path(restore_numeric_ids=restore_numeric_ids)
1041 all_dirs.sort(key = lambda x : len(x.path), reverse=True)
1042 for dir in all_dirs:
1043 # Don't need to check xpath -- won't be in all_dirs if not OK.
1044 xpath = _clean_up_extract_path(dir.path)
1046 print >> sys.stderr, '=', xpath
1047 # Shouldn't have to check for risky paths here (omitted above).
1048 dir.apply_to_path(path=dir.path,
1049 restore_numeric_ids=restore_numeric_ids)