2 import copy, errno, sys, stat, re
3 from bup import options, git, metadata, vfs
4 from bup.helpers import *
5 from bup._helpers import write_sparsely
8 bup restore [-C outdir] </branch/revision/path/to/dir ...>
10 C,outdir= change to given outdir before extracting files
11 numeric-ids restore numeric IDs (user, group, etc.) rather than names
12 exclude-rx= skip paths matching the unanchored regex (may be repeated)
13 exclude-rx-from= skip --exclude-rx patterns in file (may be repeated)
14 sparse create sparse files
15 v,verbose increase log output (can be used more than once)
16 map-user= given OLD=NEW, restore OLD user as NEW user
17 map-group= given OLD=NEW, restore OLD group as NEW group
18 map-uid= given OLD=NEW, restore OLD uid as NEW uid
19 map-gid= given OLD=NEW, restore OLD gid as NEW gid
20 q,quiet don't show progress meter
25 # stdout should be flushed after each line, even when not connected to a tty
27 sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 1)
39 def valid_restore_path(path):
40 path = os.path.normpath(path)
41 if path.startswith('/'):
47 def print_info(n, fullname):
48 if stat.S_ISDIR(n.mode):
49 verbose1('%s/' % fullname)
50 elif stat.S_ISLNK(n.mode):
51 verbose2('%s@ -> %s' % (fullname, n.readlink()))
56 def create_path(n, fullname, meta):
58 meta.create_path(fullname)
60 # These fallbacks are important -- meta could be null if, for
61 # example, save created a "fake" item, i.e. a new strip/graft
62 # path element, etc. You can find cases like that by
63 # searching for "Metadata()".
65 if stat.S_ISDIR(n.mode):
67 elif stat.S_ISLNK(n.mode):
68 os.symlink(n.readlink(), fullname)
71 def parse_owner_mappings(type, options, fatal):
72 """Traverse the options and parse all --map-TYPEs, or call Option.fatal()."""
73 opt_name = '--map-' + type
74 value_rx = r'^([^=]+)=([^=]*)$'
75 if type in ('uid', 'gid'):
76 value_rx = r'^(-?[0-9]+)=(-?[0-9]+)$'
79 (option, parameter) = flag
80 if option != opt_name:
82 match = re.match(value_rx, parameter)
84 raise fatal("Cannot parse %s as %s mapping" % (parameter, type))
85 old_id, new_id = match.groups()
86 if type in ('uid', 'gid'):
89 owner_map[old_id] = new_id
93 def apply_metadata(meta, name, restore_numeric_ids, owner_map):
94 m = copy.deepcopy(meta)
95 m.user = owner_map['user'].get(m.user, m.user)
96 m.group = owner_map['group'].get(m.group, m.group)
97 m.uid = owner_map['uid'].get(m.uid, m.uid)
98 m.gid = owner_map['gid'].get(m.gid, m.gid)
99 m.apply_to_path(name, restore_numeric_ids = restore_numeric_ids)
102 # Track a list of (restore_path, vfs_path, meta) triples for each path
103 # we've written for a given hardlink_target. This allows us to handle
104 # the case where we restore a set of hardlinks out of order (with
105 # respect to the original save call(s)) -- i.e. when we don't restore
106 # the hardlink_target path first. This data also allows us to attempt
107 # to handle other situations like hardlink sets that change on disk
108 # during a save, or between index and save.
111 def hardlink_compatible(target_path, target_vfs_path, target_meta,
114 if not os.path.exists(target_path):
116 target_node = top.lresolve(target_vfs_path)
117 if src_node.mode != target_node.mode \
118 or src_node.mtime != target_node.mtime \
119 or src_node.ctime != target_node.ctime \
120 or src_node.hash != target_node.hash:
122 if not src_meta.same_file(target_meta):
127 def hardlink_if_possible(fullname, node, meta):
128 """Find a suitable hardlink target, link to it, and return true,
129 otherwise return false."""
130 # Expect the caller to handle restoring the metadata if
131 # hardlinking isn't possible.
132 global targets_written
133 target = meta.hardlink_target
134 target_versions = targets_written.get(target)
136 # Check every path in the set that we've written so far for a match.
137 for (target_path, target_vfs_path, target_meta) in target_versions:
138 if hardlink_compatible(target_path, target_vfs_path, target_meta,
141 os.link(target_path, fullname)
144 if e.errno != errno.EXDEV:
148 targets_written[target] = target_versions
149 full_vfs_path = node.fullname()
150 target_versions.append((fullname, full_vfs_path, meta))
154 def write_file_content(fullname, n):
155 outf = open(fullname, 'wb')
157 for b in chunkyreader(n.open()):
163 def write_file_content_sparsely(fullname, n):
164 outfd = os.open(fullname, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 0600)
167 for b in chunkyreader(n.open()):
168 trailing_zeros = write_sparsely(outfd, b, 512, trailing_zeros)
169 pos = os.lseek(outfd, trailing_zeros, os.SEEK_END)
170 os.ftruncate(outfd, pos)
175 def find_dir_item_metadata_by_name(dir, name):
176 """Find metadata in dir (a node) for an item with the given name,
177 or for the directory itself if the name is ''."""
180 mfile = dir.metadata_file() # VFS file -- cannot close().
182 meta_stream = mfile.open()
183 # First entry is for the dir itself.
184 meta = metadata.Metadata.read(meta_stream)
188 if stat.S_ISDIR(sub.mode):
189 meta = find_dir_item_metadata_by_name(sub, '')
191 meta = metadata.Metadata.read(meta_stream)
199 def do_root(n, sparse, owner_map, restore_root_meta = True):
200 # Very similar to do_node(), except that this function doesn't
201 # create a path for n's destination directory (and so ignores
202 # n.fullname). It assumes the destination is '.', and restores
203 # n's metadata and content there.
204 global total_restored, opt
207 # Directory metadata is the first entry in any .bupm file in
208 # the directory. Get it.
209 mfile = n.metadata_file() # VFS file -- cannot close().
212 meta_stream = mfile.open()
213 root_meta = metadata.Metadata.read(meta_stream)
217 progress_update('Restoring: %d ...' % total_restored, False)
220 # Don't get metadata if this is a dir -- handled in sub do_node().
221 if meta_stream and not stat.S_ISDIR(sub.mode):
222 m = metadata.Metadata.read(meta_stream)
223 do_node(n, sub, sparse, owner_map, meta = m)
224 if root_meta and restore_root_meta:
225 apply_metadata(root_meta, '.', opt.numeric_ids, owner_map)
230 def do_node(top, n, sparse, owner_map, meta = None):
231 # Create n.fullname(), relative to the current directory, and
232 # restore all of its metadata, when available. The meta argument
233 # will be None for dirs, or when there is no .bupm (i.e. no
235 global total_restored, opt
237 write_content = sparse and write_file_content_sparsely or write_file_content
239 fullname = n.fullname(stop_at=top)
240 # Match behavior of index --exclude-rx with respect to paths.
241 exclude_candidate = '/' + fullname
242 if(stat.S_ISDIR(n.mode)):
243 exclude_candidate += '/'
244 if should_rx_exclude_path(exclude_candidate, exclude_rxs):
246 # If this is a directory, its metadata is the first entry in
247 # any .bupm file inside the directory. Get it.
248 if(stat.S_ISDIR(n.mode)):
249 mfile = n.metadata_file() # VFS file -- cannot close().
251 meta_stream = mfile.open()
252 meta = metadata.Metadata.read(meta_stream)
253 print_info(n, fullname)
255 created_hardlink = False
256 if meta and meta.hardlink_target:
257 created_hardlink = hardlink_if_possible(fullname, n, meta)
259 if not created_hardlink:
260 create_path(n, fullname, meta)
262 if stat.S_ISREG(meta.mode):
263 write_content(fullname, n)
264 elif stat.S_ISREG(n.mode):
265 write_content(fullname, n)
269 progress_update('Restoring: %d ...' % total_restored, False)
272 # Don't get metadata if this is a dir -- handled in sub do_node().
273 if meta_stream and not stat.S_ISDIR(sub.mode):
274 m = metadata.Metadata.read(meta_stream)
275 do_node(top, sub, sparse, owner_map, meta = m)
276 if meta and not created_hardlink:
277 apply_metadata(meta, fullname, opt.numeric_ids, owner_map)
286 o = options.Options(optspec)
287 (opt, flags, extra) = o.parse(sys.argv[1:])
289 git.check_repo_or_die()
290 top = vfs.RefList(None)
293 o.fatal('must specify at least one filename to restore')
295 exclude_rxs = parse_rx_excludes(flags, o.fatal)
298 for map_type in ('user', 'group', 'uid', 'gid'):
299 owner_map[map_type] = parse_owner_mappings(map_type, flags, o.fatal)
307 if not valid_restore_path(d):
308 add_error("Error: Path %r doesn't include a branch and revision!" % d)
310 path,name = os.path.split(d)
313 except vfs.NodeError, e:
316 isdir = stat.S_ISDIR(n.mode)
317 if not name or name == '.':
318 # Source is /foo/what/ever/ or /foo/what/ever/. -- extract
319 # what/ever/* to the current directory, and if name == '.'
320 # (i.e. /foo/what/ever/.), then also restore what/ever's
321 # metadata to the current directory.
323 add_error('%r: Not a directory!' % d)
325 do_root(n, opt.sparse, owner_map, restore_root_meta = (name == '.'))
327 # Source is /foo/what/ever -- extract ./ever to cwd.
328 if isinstance(n, vfs.FakeSymlink):
329 # Source is actually /foo/what, i.e. a top-level commit
330 # like /foo/latest, which is a symlink to ../.commit/SHA.
331 # So dereference it, and restore ../.commit/SHA/. to
333 target = n.dereference()
336 do_root(target, opt.sparse, owner_map)
337 else: # Not a directory or fake symlink.
338 meta = find_dir_item_metadata_by_name(n.parent, n.name)
339 do_node(n.parent, n, opt.sparse, owner_map, meta = meta)
342 progress_end('Restoring: %d, done.' % total_restored)
344 if not check_saved_errors():