From e21af7d71c2c53e2f2cacea9eb9e277ed50b0eac Mon Sep 17 00:00:00 2001 From: Michael Vrable Date: Thu, 20 Sep 2012 13:43:22 -0700 Subject: [PATCH] Refactor cumulus-util into a library plus small command front-end. There is still more cleanup work to be done here, but this first step makes commands in cumulus-util importable as a Python module for re-use elsewhere. --- cumulus-util | 399 +---------------------------------- python/cumulus/cmd_util.py | 422 +++++++++++++++++++++++++++++++++++++ 2 files changed, 425 insertions(+), 396 deletions(-) create mode 100644 python/cumulus/cmd_util.py diff --git a/cumulus-util b/cumulus-util index 1608b63..e8bdf5e 100755 --- a/cumulus-util +++ b/cumulus-util @@ -2,406 +2,13 @@ # # Utility for managing Cumulus archives. -import getpass, os, stat, sys, time -from optparse import OptionParser +import os, sys # Automatically set Python path, based on script directory. This should be # removed if the tools are properly installed somewhere. script_directory = os.path.dirname(sys.argv[0]) sys.path.append(os.path.join(script_directory, 'python')) -import cumulus +import cumulus.cmd_util -# We support up to "Cumulus Snapshot v0.11" formats, but are also limited by -# the cumulus module. -FORMAT_VERSION = min(cumulus.FORMAT_VERSION, (0, 11)) - -def check_version(format): - ver = cumulus.parse_metadata_version(format) - if ver > FORMAT_VERSION: - raise RuntimeError("Unsupported Cumulus format: " + format) - -# Read a passphrase from the user and store it in the LBS_GPG_PASSPHRASE -# environment variable. -def get_passphrase(): - ENV_KEY = 'LBS_GPG_PASSPHRASE' - if not os.environ.has_key(ENV_KEY): - os.environ[ENV_KEY] = getpass.getpass() - -def cmd_prune_db(args): - """ Delete old snapshots from the local database, though do not - actually schedule any segment cleaning. - Syntax: $0 --localdb=LOCALDB prune-db - """ - db = cumulus.LocalDatabase(options.localdb) - - # Delete old snapshots from the local database. - #db.garbage_collect() - #db.commit() - -def cmd_clean(args, clean_threshold=7.0): - """ Run the segment cleaner. - Syntax: $0 --localdb=LOCALDB clean - """ - db = cumulus.LocalDatabase(options.localdb) - - # Delete old snapshots from the local database. - intent = float(options.intent) - for s in db.list_schemes(): - db.garbage_collect(s, intent) - - # Expire segments which are poorly-utilized. - for s in db.get_segment_cleaning_list(): - if s.cleaning_benefit > clean_threshold: - print "Cleaning segment %d (benefit %.2f)" % (s.id, - s.cleaning_benefit) - db.mark_segment_expired(s) - else: - break - db.balance_expired_objects() - db.commit() - -def cmd_list_snapshots(args): - """ List snapshots stored. - Syntax: $0 --data=DATADIR list-snapshots - """ - store = cumulus.LowlevelDataStore(options.store) - for s in sorted(store.list_snapshots()): - print s - -def cmd_list_snapshot_sizes(args): - """ List size of data needed for each snapshot. - Syntax: $0 --data=DATADIR list-snapshot-sizes - """ - lowlevel = cumulus.LowlevelDataStore(options.store) - lowlevel.scan() - store = cumulus.ObjectStore(lowlevel) - previous = set() - exts = {} - for seg in lowlevel.store.list('segments'): - exts.update ([seg.split ('.', 1)]) - for s in sorted(lowlevel.list_snapshots()): - d = cumulus.parse_full(store.load_snapshot(s)) - check_version(d['Format']) - - try: - intent = float(d['Backup-Intent']) - except: - intent = 1.0 - - segments = d['Segments'].split() - (size, added, removed, addcount, remcount) = (0, 0, 0, 0, 0) - lo_stat = lowlevel.lowlevel_stat - for seg in segments: - segsize = lo_stat('.'.join ((seg, exts[seg])))['size'] - size += segsize - if seg not in previous: - added += segsize - addcount += 1 - for seg in previous: - if seg not in segments: - removed += lo_stat('.'.join((seg, exts[seg])))['size'] - remcount += 1 - previous = set(segments) - print "%s [%s]: %.3f +%.3f -%.3f (+%d/-%d segments)" % (s, intent, size / 1024.0**2, added / 1024.0**2, removed / 1024.0**2, addcount, remcount) - -def cmd_garbage_collect(args): - """ Search for any files which are not needed by any current - snapshots and offer to delete them. - Syntax: $0 --store=DATADIR gc - """ - lowlevel = cumulus.LowlevelDataStore(options.store) - lowlevel.scan() - store = cumulus.ObjectStore(lowlevel) - snapshots = set(lowlevel.list_snapshots()) - segments = set() - for s in snapshots: - d = cumulus.parse_full(store.load_snapshot(s)) - check_version(d['Format']) - segments.update(d['Segments'].split()) - - referenced = snapshots.union(segments) - reclaimed = 0 - for (t, r) in cumulus.store.type_patterns.items(): - for f in lowlevel.store.list(t): - m = r.match(f) - if m is None or m.group(1) not in referenced: - print "Garbage:", (t, f) - reclaimed += lowlevel.store.stat(t, f)['size'] - if not options.dry_run: - lowlevel.store.delete(t, f) - print "Reclaimed space:", reclaimed - -cmd_gc = cmd_garbage_collect - -def cmd_object_checksums(segments): - """ Build checksum list for objects in the given segments, or all - segments if none are specified. - """ - get_passphrase() - lowlevel = cumulus.LowlevelDataStore(options.store) - store = cumulus.ObjectStore(lowlevel) - if len(segments) == 0: - segments = sorted(lowlevel.list_segments()) - for s in segments: - for (o, data) in store.load_segment(s): - csum = cumulus.ChecksumCreator().update(data).compute() - print "%s/%s:%d:%s" % (s, o, len(data), csum) - store.cleanup() -object_sums = cmd_object_checksums - -def cmd_read_snapshots(snapshots): - """ Read a snapshot file - """ - get_passphrase() - lowlevel = cumulus.LowlevelDataStore(options.store) - store = cumulus.ObjectStore(lowlevel) - for s in snapshots: - d = cumulus.parse_full(store.load_snapshot(s)) - check_version(d['Format']) - print d - print d['Segments'].split() - store.cleanup() - -def cmd_read_metadata(args): - """ Produce a flattened metadata dump from a snapshot - """ - snapshot = args [0] - get_passphrase() - lowlevel = cumulus.LowlevelDataStore(options.store) - store = cumulus.ObjectStore(lowlevel) - d = cumulus.parse_full(store.load_snapshot(snapshot)) - check_version(d['Format']) - metadata = cumulus.read_metadata(store, d['Root']) - blank = True - for l in metadata: - if l == '\n': - if blank: continue - blank = True - else: - blank = False - sys.stdout.write(l) - store.cleanup() - -def cmd_verify_snapshots(snapshots): - """ Verify snapshot integrity - """ - get_passphrase() - lowlevel = cumulus.LowlevelDataStore(options.store) - store = cumulus.ObjectStore(lowlevel) - for s in snapshots: - cumulus.accessed_segments.clear() - print "#### Snapshot", s - d = cumulus.parse_full(store.load_snapshot(s)) - check_version(d['Format']) - print "## Root:", d['Root'] - metadata = cumulus.iterate_metadata(store, d['Root']) - for m in metadata: - if m.fields['type'] not in ('-', 'f'): continue - print "%s [%d bytes]" % (m.fields['name'], int(m.fields['size'])) - verifier = cumulus.ChecksumVerifier(m.fields['checksum']) - size = 0 - for block in m.data(): - data = store.get(block) - verifier.update(data) - size += len(data) - if int(m.fields['size']) != size: - raise ValueError("File size does not match!") - if not verifier.valid(): - raise ValueError("Bad checksum found") - - # Verify that the list of segments included with the snapshot was - # actually accurate: covered all segments that were really read, and - # doesn't contain duplicates. - listed_segments = set(d['Segments'].split()) - if cumulus.accessed_segments - listed_segments: - print "Error: Some segments not listed in descriptor!" - print sorted(list(cumulus.accessed_segments - listed_segments)) - if listed_segments - cumulus.accessed_segments : - print "Warning: Extra unused segments listed in descriptor!" - print sorted(list(listed_segments - cumulus.accessed_segments)) - store.cleanup() - -def cmd_restore_snapshot(args): - """ Restore a snapshot, or some subset of files from it - """ - get_passphrase() - lowlevel = cumulus.LowlevelDataStore(options.store) - store = cumulus.ObjectStore(lowlevel) - snapshot = cumulus.parse_full(store.load_snapshot(args[0])) - check_version(snapshot['Format']) - destdir = args[1] - paths = args[2:] - - def matchpath(path): - "Return true if the specified path should be included in the restore." - - # No specification of what to restore => restore everything - if len(paths) == 0: return True - - for p in paths: - if path == p: return True - if path.startswith(p + "/"): return True - return False - - def warn(m, msg): - print "Warning: %s: %s" % (m.items.name, msg) - - # Phase 1: Read the complete metadata log and create directory structure. - metadata_items = [] - metadata_paths = {} - metadata_segments = {} - for m in cumulus.iterate_metadata(store, snapshot['Root']): - pathname = os.path.normpath(m.items.name) - while os.path.isabs(pathname): - pathname = pathname[1:] - if not matchpath(pathname): continue - - destpath = os.path.join(destdir, pathname) - if m.items.type == 'd': - path = destpath - else: - (path, filename) = os.path.split(destpath) - - metadata_items.append((pathname, m)) - if m.items.type in ('-', 'f'): - metadata_paths[pathname] = m - for block in m.data(): - (segment, object, checksum, slice) \ - = cumulus.ObjectStore.parse_ref(block) - if segment not in metadata_segments: - metadata_segments[segment] = set() - metadata_segments[segment].add(pathname) - - try: - if not os.path.isdir(path): - print "mkdir:", path - os.makedirs(path) - except Exception, e: - warn(m, "Error creating directory structure: %s" % (e,)) - continue - - # Phase 2: Restore files, ordered by how data is stored in segments. - def restore_file(pathname, m): - assert m.items.type in ('-', 'f') - print "extract:", pathname - destpath = os.path.join(destdir, pathname) - - file = open(destpath, 'wb') - verifier = cumulus.ChecksumVerifier(m.items.checksum) - size = 0 - for block in m.data(): - data = store.get(block) - verifier.update(data) - size += len(data) - file.write(data) - file.close() - if int(m.fields['size']) != size: - raise ValueError("File size does not match!") - if not verifier.valid(): - raise ValueError("Bad checksum found") - - while metadata_segments: - (segment, items) = metadata_segments.popitem() - print "+ Segment", segment - for pathname in sorted(items): - if pathname in metadata_paths: - restore_file(pathname, metadata_paths[pathname]) - del metadata_paths[pathname] - - print "+ Remaining files" - while metadata_paths: - (pathname, m) = metadata_paths.popitem() - restore_file(pathname, m) - - # Phase 3: Restore special files (symlinks, devices). - # Phase 4: Restore directory permissions and modification times. - for (pathname, m) in reversed(metadata_items): - print "permissions:", pathname - destpath = os.path.join(destdir, pathname) - (path, filename) = os.path.split(destpath) - - # TODO: Check for ../../../paths that might attempt to write outside - # the destination directory. Maybe also check attempts to follow - # symlinks pointing outside? - - try: - if m.items.type in ('-', 'f', 'd'): - pass - elif m.items.type == 'l': - try: - target = m.items.target - except: - # Old (v0.2 format) name for 'target' - target = m.items.contents - os.symlink(target, destpath) - elif m.items.type == 'p': - os.mkfifo(destpath) - elif m.items.type in ('c', 'b'): - if m.items.type == 'c': - mode = 0600 | stat.S_IFCHR - else: - mode = 0600 | stat.S_IFBLK - os.mknod(destpath, mode, os.makedev(*m.items.device)) - elif m.items.type == 's': - pass # TODO: Implement - else: - warn(m, "Unknown type code: " + m.items.type) - continue - - except Exception, e: - warn(m, "Error restoring: %s" % (e,)) - continue - - try: - uid = m.items.user[0] - gid = m.items.group[0] - os.lchown(destpath, uid, gid) - except Exception, e: - warn(m, "Error restoring file ownership: %s" % (e,)) - - if m.items.type == 'l': - continue - - try: - os.chmod(destpath, m.items.mode) - except Exception, e: - warn(m, "Error restoring file permissions: %s" % (e,)) - - try: - os.utime(destpath, (time.time(), m.items.mtime)) - except Exception, e: - warn(m, "Error restoring file timestamps: %s" % (e,)) - - store.cleanup() - -usage = ["%prog [option]... command [arg]...", "", "Commands:"] -cmd = method = None -for cmd, method in locals().iteritems(): - if cmd.startswith ('cmd_'): - usage.append(cmd[4:].replace('_', '-') + ':' + method.__doc__) -parser = OptionParser(usage="\n".join(usage)) -parser.add_option("-v", action="store_true", dest="verbose", default=False, - help="increase verbosity") -parser.add_option("-n", action="store_true", dest="dry_run", default=False, - help="dry run") -parser.add_option("--store", dest="store", - help="specify path to backup data store") -parser.add_option("--localdb", dest="localdb", - help="specify path to local database") -parser.add_option("--intent", dest="intent", default=1.0, - help="give expected next snapshot type when cleaning") -(options, args) = parser.parse_args(sys.argv[1:]) - -if len(args) == 0: - parser.print_usage() - sys.exit(1) -cmd = args[0] -args = args[1:] -method = locals().get('cmd_' + cmd.replace('-', '_')) -if method: - method (args) -else: - print "Unknown command:", cmd - parser.print_usage() - sys.exit(1) +cumulus.cmd_util.main(sys.argv) diff --git a/python/cumulus/cmd_util.py b/python/cumulus/cmd_util.py new file mode 100644 index 0000000..c3733f0 --- /dev/null +++ b/python/cumulus/cmd_util.py @@ -0,0 +1,422 @@ +# Cumulus: Smart Filesystem Backup to Dumb Servers +# +# Copyright (C) 2006-2009 The Regents of the University of California +# Copyright (C) 2012 Google Inc. +# Written by Michael Vrable +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program; if not, write to the Free Software Foundation, Inc., +# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +"""Implementation of the Cumulus command-line utility program.""" + +import getpass, os, stat, sys, time +from optparse import OptionParser + +import cumulus + +# We support up to "Cumulus Snapshot v0.11" formats, but are also limited by +# the cumulus module. +FORMAT_VERSION = min(cumulus.FORMAT_VERSION, (0, 11)) + +def check_version(format): + ver = cumulus.parse_metadata_version(format) + if ver > FORMAT_VERSION: + raise RuntimeError("Unsupported Cumulus format: " + format) + +# Read a passphrase from the user and store it in the LBS_GPG_PASSPHRASE +# environment variable. +def get_passphrase(): + ENV_KEY = 'LBS_GPG_PASSPHRASE' + if not os.environ.has_key(ENV_KEY): + os.environ[ENV_KEY] = getpass.getpass() + +def cmd_prune_db(args): + """ Delete old snapshots from the local database, though do not + actually schedule any segment cleaning. + Syntax: $0 --localdb=LOCALDB prune-db + """ + db = cumulus.LocalDatabase(options.localdb) + + # Delete old snapshots from the local database. + #db.garbage_collect() + #db.commit() + +def cmd_clean(args, clean_threshold=7.0): + """ Run the segment cleaner. + Syntax: $0 --localdb=LOCALDB clean + """ + db = cumulus.LocalDatabase(options.localdb) + + # Delete old snapshots from the local database. + intent = float(options.intent) + for s in db.list_schemes(): + db.garbage_collect(s, intent) + + # Expire segments which are poorly-utilized. + for s in db.get_segment_cleaning_list(): + if s.cleaning_benefit > clean_threshold: + print "Cleaning segment %d (benefit %.2f)" % (s.id, + s.cleaning_benefit) + db.mark_segment_expired(s) + else: + break + db.balance_expired_objects() + db.commit() + +def cmd_list_snapshots(args): + """ List snapshots stored. + Syntax: $0 --data=DATADIR list-snapshots + """ + store = cumulus.LowlevelDataStore(options.store) + for s in sorted(store.list_snapshots()): + print s + +def cmd_list_snapshot_sizes(args): + """ List size of data needed for each snapshot. + Syntax: $0 --data=DATADIR list-snapshot-sizes + """ + lowlevel = cumulus.LowlevelDataStore(options.store) + lowlevel.scan() + store = cumulus.ObjectStore(lowlevel) + previous = set() + exts = {} + for seg in lowlevel.store.list('segments'): + exts.update ([seg.split ('.', 1)]) + for s in sorted(lowlevel.list_snapshots()): + d = cumulus.parse_full(store.load_snapshot(s)) + check_version(d['Format']) + + try: + intent = float(d['Backup-Intent']) + except: + intent = 1.0 + + segments = d['Segments'].split() + (size, added, removed, addcount, remcount) = (0, 0, 0, 0, 0) + lo_stat = lowlevel.lowlevel_stat + for seg in segments: + segsize = lo_stat('.'.join ((seg, exts[seg])))['size'] + size += segsize + if seg not in previous: + added += segsize + addcount += 1 + for seg in previous: + if seg not in segments: + removed += lo_stat('.'.join((seg, exts[seg])))['size'] + remcount += 1 + previous = set(segments) + print "%s [%s]: %.3f +%.3f -%.3f (+%d/-%d segments)" % (s, intent, size / 1024.0**2, added / 1024.0**2, removed / 1024.0**2, addcount, remcount) + +def cmd_garbage_collect(args): + """ Search for any files which are not needed by any current + snapshots and offer to delete them. + Syntax: $0 --store=DATADIR gc + """ + lowlevel = cumulus.LowlevelDataStore(options.store) + lowlevel.scan() + store = cumulus.ObjectStore(lowlevel) + snapshots = set(lowlevel.list_snapshots()) + segments = set() + for s in snapshots: + d = cumulus.parse_full(store.load_snapshot(s)) + check_version(d['Format']) + segments.update(d['Segments'].split()) + + referenced = snapshots.union(segments) + reclaimed = 0 + for (t, r) in cumulus.store.type_patterns.items(): + for f in lowlevel.store.list(t): + m = r.match(f) + if m is None or m.group(1) not in referenced: + print "Garbage:", (t, f) + reclaimed += lowlevel.store.stat(t, f)['size'] + if not options.dry_run: + lowlevel.store.delete(t, f) + print "Reclaimed space:", reclaimed + +cmd_gc = cmd_garbage_collect + +def cmd_object_checksums(segments): + """ Build checksum list for objects in the given segments, or all + segments if none are specified. + """ + get_passphrase() + lowlevel = cumulus.LowlevelDataStore(options.store) + store = cumulus.ObjectStore(lowlevel) + if len(segments) == 0: + segments = sorted(lowlevel.list_segments()) + for s in segments: + for (o, data) in store.load_segment(s): + csum = cumulus.ChecksumCreator().update(data).compute() + print "%s/%s:%d:%s" % (s, o, len(data), csum) + store.cleanup() +object_sums = cmd_object_checksums + +def cmd_read_snapshots(snapshots): + """ Read a snapshot file + """ + get_passphrase() + lowlevel = cumulus.LowlevelDataStore(options.store) + store = cumulus.ObjectStore(lowlevel) + for s in snapshots: + d = cumulus.parse_full(store.load_snapshot(s)) + check_version(d['Format']) + print d + print d['Segments'].split() + store.cleanup() + +def cmd_read_metadata(args): + """ Produce a flattened metadata dump from a snapshot + """ + snapshot = args [0] + get_passphrase() + lowlevel = cumulus.LowlevelDataStore(options.store) + store = cumulus.ObjectStore(lowlevel) + d = cumulus.parse_full(store.load_snapshot(snapshot)) + check_version(d['Format']) + metadata = cumulus.read_metadata(store, d['Root']) + blank = True + for l in metadata: + if l == '\n': + if blank: continue + blank = True + else: + blank = False + sys.stdout.write(l) + store.cleanup() + +def cmd_verify_snapshots(snapshots): + """ Verify snapshot integrity + """ + get_passphrase() + lowlevel = cumulus.LowlevelDataStore(options.store) + store = cumulus.ObjectStore(lowlevel) + for s in snapshots: + cumulus.accessed_segments.clear() + print "#### Snapshot", s + d = cumulus.parse_full(store.load_snapshot(s)) + check_version(d['Format']) + print "## Root:", d['Root'] + metadata = cumulus.iterate_metadata(store, d['Root']) + for m in metadata: + if m.fields['type'] not in ('-', 'f'): continue + print "%s [%d bytes]" % (m.fields['name'], int(m.fields['size'])) + verifier = cumulus.ChecksumVerifier(m.fields['checksum']) + size = 0 + for block in m.data(): + data = store.get(block) + verifier.update(data) + size += len(data) + if int(m.fields['size']) != size: + raise ValueError("File size does not match!") + if not verifier.valid(): + raise ValueError("Bad checksum found") + + # Verify that the list of segments included with the snapshot was + # actually accurate: covered all segments that were really read, and + # doesn't contain duplicates. + listed_segments = set(d['Segments'].split()) + if cumulus.accessed_segments - listed_segments: + print "Error: Some segments not listed in descriptor!" + print sorted(list(cumulus.accessed_segments - listed_segments)) + if listed_segments - cumulus.accessed_segments : + print "Warning: Extra unused segments listed in descriptor!" + print sorted(list(listed_segments - cumulus.accessed_segments)) + store.cleanup() + +def cmd_restore_snapshot(args): + """ Restore a snapshot, or some subset of files from it + """ + get_passphrase() + lowlevel = cumulus.LowlevelDataStore(options.store) + store = cumulus.ObjectStore(lowlevel) + snapshot = cumulus.parse_full(store.load_snapshot(args[0])) + check_version(snapshot['Format']) + destdir = args[1] + paths = args[2:] + + def matchpath(path): + "Return true if the specified path should be included in the restore." + + # No specification of what to restore => restore everything + if len(paths) == 0: return True + + for p in paths: + if path == p: return True + if path.startswith(p + "/"): return True + return False + + def warn(m, msg): + print "Warning: %s: %s" % (m.items.name, msg) + + # Phase 1: Read the complete metadata log and create directory structure. + metadata_items = [] + metadata_paths = {} + metadata_segments = {} + for m in cumulus.iterate_metadata(store, snapshot['Root']): + pathname = os.path.normpath(m.items.name) + while os.path.isabs(pathname): + pathname = pathname[1:] + if not matchpath(pathname): continue + + destpath = os.path.join(destdir, pathname) + if m.items.type == 'd': + path = destpath + else: + (path, filename) = os.path.split(destpath) + + metadata_items.append((pathname, m)) + if m.items.type in ('-', 'f'): + metadata_paths[pathname] = m + for block in m.data(): + (segment, object, checksum, slice) \ + = cumulus.ObjectStore.parse_ref(block) + if segment not in metadata_segments: + metadata_segments[segment] = set() + metadata_segments[segment].add(pathname) + + try: + if not os.path.isdir(path): + print "mkdir:", path + os.makedirs(path) + except Exception, e: + warn(m, "Error creating directory structure: %s" % (e,)) + continue + + # Phase 2: Restore files, ordered by how data is stored in segments. + def restore_file(pathname, m): + assert m.items.type in ('-', 'f') + print "extract:", pathname + destpath = os.path.join(destdir, pathname) + + file = open(destpath, 'wb') + verifier = cumulus.ChecksumVerifier(m.items.checksum) + size = 0 + for block in m.data(): + data = store.get(block) + verifier.update(data) + size += len(data) + file.write(data) + file.close() + if int(m.fields['size']) != size: + raise ValueError("File size does not match!") + if not verifier.valid(): + raise ValueError("Bad checksum found") + + while metadata_segments: + (segment, items) = metadata_segments.popitem() + print "+ Segment", segment + for pathname in sorted(items): + if pathname in metadata_paths: + restore_file(pathname, metadata_paths[pathname]) + del metadata_paths[pathname] + + print "+ Remaining files" + while metadata_paths: + (pathname, m) = metadata_paths.popitem() + restore_file(pathname, m) + + # Phase 3: Restore special files (symlinks, devices). + # Phase 4: Restore directory permissions and modification times. + for (pathname, m) in reversed(metadata_items): + print "permissions:", pathname + destpath = os.path.join(destdir, pathname) + (path, filename) = os.path.split(destpath) + + # TODO: Check for ../../../paths that might attempt to write outside + # the destination directory. Maybe also check attempts to follow + # symlinks pointing outside? + + try: + if m.items.type in ('-', 'f', 'd'): + pass + elif m.items.type == 'l': + try: + target = m.items.target + except: + # Old (v0.2 format) name for 'target' + target = m.items.contents + os.symlink(target, destpath) + elif m.items.type == 'p': + os.mkfifo(destpath) + elif m.items.type in ('c', 'b'): + if m.items.type == 'c': + mode = 0600 | stat.S_IFCHR + else: + mode = 0600 | stat.S_IFBLK + os.mknod(destpath, mode, os.makedev(*m.items.device)) + elif m.items.type == 's': + pass # TODO: Implement + else: + warn(m, "Unknown type code: " + m.items.type) + continue + + except Exception, e: + warn(m, "Error restoring: %s" % (e,)) + continue + + try: + uid = m.items.user[0] + gid = m.items.group[0] + os.lchown(destpath, uid, gid) + except Exception, e: + warn(m, "Error restoring file ownership: %s" % (e,)) + + if m.items.type == 'l': + continue + + try: + os.chmod(destpath, m.items.mode) + except Exception, e: + warn(m, "Error restoring file permissions: %s" % (e,)) + + try: + os.utime(destpath, (time.time(), m.items.mtime)) + except Exception, e: + warn(m, "Error restoring file timestamps: %s" % (e,)) + + store.cleanup() + +def main(argv): + usage = ["%prog [option]... command [arg]...", "", "Commands:"] + cmd = method = None + for cmd, method in globals().iteritems(): + if cmd.startswith ('cmd_'): + usage.append(cmd[4:].replace('_', '-') + ':' + method.__doc__) + parser = OptionParser(usage="\n".join(usage)) + parser.add_option("-v", action="store_true", dest="verbose", default=False, + help="increase verbosity") + parser.add_option("-n", action="store_true", dest="dry_run", default=False, + help="dry run") + parser.add_option("--store", dest="store", + help="specify path to backup data store") + parser.add_option("--localdb", dest="localdb", + help="specify path to local database") + parser.add_option("--intent", dest="intent", default=1.0, + help="give expected next snapshot type when cleaning") + global options + (options, args) = parser.parse_args(argv[1:]) + + if len(args) == 0: + parser.print_usage() + sys.exit(1) + cmd = args[0] + args = args[1:] + method = globals().get('cmd_' + cmd.replace('-', '_')) + if method: + method (args) + else: + print "Unknown command:", cmd + parser.print_usage() + sys.exit(1) -- 2.20.1