#
# Utility for managing LBS archives.
-import getpass, os, sys
+import getpass, os, stat, sys, time
from optparse import OptionParser
import lbs
+# We support up to "LBS Snapshot v0.6" formats, but are also limited by the lbs
+# module.
+FORMAT_VERSION = min(lbs.FORMAT_VERSION, (0, 6))
+
+def check_version(format):
+ ver = lbs.parse_metadata_version(format)
+ if ver > FORMAT_VERSION:
+ raise RuntimeError("Unsupported LBS format: " + format)
+
parser = OptionParser(usage="%prog [option]... command [arg]...")
parser.add_option("-v", action="store_true", dest="verbose", default=False,
help="increase verbosity")
previous = set()
for s in sorted(lowlevel.list_snapshots()):
d = lbs.parse_full(store.load_snapshot(s))
+ check_version(d['Format'])
segments = d['Segments'].split()
(size, added, removed) = (0, 0, 0)
for seg in segments:
store = lbs.ObjectStore(lowlevel)
for s in snapshots:
d = lbs.parse_full(store.load_snapshot(s))
+ check_version(d['Format'])
print d
print d['Segments'].split()
store.cleanup()
+# Produce a flattened metadata dump from a snapshot
+def cmd_read_metadata(snapshot):
+ get_passphrase()
+ lowlevel = lbs.LowlevelDataStore(options.store)
+ store = lbs.ObjectStore(lowlevel)
+ d = lbs.parse_full(store.load_snapshot(snapshot))
+ check_version(d['Format'])
+ metadata = lbs.read_metadata(store, d['Root'])
+ for l in metadata:
+ sys.stdout.write(l)
+ store.cleanup()
+
# Verify snapshot integrity
def cmd_verify_snapshots(snapshots):
get_passphrase()
for s in snapshots:
print "#### Snapshot", s
d = lbs.parse_full(store.load_snapshot(s))
+ check_version(d['Format'])
print "## Root:", d['Root']
metadata = lbs.iterate_metadata(store, d['Root'])
for m in metadata:
- if m.fields['type'] != '-': continue
+ if m.fields['type'] not in ('-', 'f'): continue
print "%s [%d bytes]" % (m.fields['name'], int(m.fields['size']))
verifier = lbs.ChecksumVerifier(m.fields['checksum'])
size = 0
raise ValueError("Bad checksum found")
store.cleanup()
+# Restore a snapshot, or some subset of files from it
+def cmd_restore_snapshot(args):
+ get_passphrase()
+ lowlevel = lbs.LowlevelDataStore(options.store)
+ store = lbs.ObjectStore(lowlevel)
+ snapshot = lbs.parse_full(store.load_snapshot(args[0]))
+ check_version(snapshot['Format'])
+ destdir = args[1]
+ paths = args[2:]
+
+ def warn(m, msg):
+ print "Warning: %s: %s" % (m.items.name, msg)
+
+ for m in lbs.iterate_metadata(store, snapshot['Root']):
+ pathname = os.path.normpath(m.items.name)
+ while os.path.isabs(pathname):
+ pathname = pathname[1:]
+ print 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 not os.path.isdir(path):
+ os.makedirs(path)
+
+ if m.items.type in ('-', 'f'):
+ file = open(destpath, 'wb')
+ verifier = lbs.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")
+ elif m.items.type == 'd':
+ if filename != '.':
+ os.mkdir(destpath)
+ 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()
+
if len(args) == 0:
parser.print_usage()
sys.exit(1)
cmd_object_checksums(args)
elif cmd == 'read-snapshots':
cmd_read_snapshots(args)
+elif cmd == 'read-metadata':
+ cmd_read_metadata(args[0])
elif cmd == 'list-snapshot-sizes':
cmd_list_snapshot_sizes()
elif cmd == 'verify-snapshots':
cmd_verify_snapshots(args)
+elif cmd == 'restore-snapshot':
+ cmd_restore_snapshot(args)
else:
print "Unknown command:", cmd
parser.print_usage()
projects / cumulus.git / blobdiff