def cmd_verify_snapshots(snapshots):
""" Verify snapshot integrity
"""
get_passphrase()
store = cumulus.CumulusStore(options.store)
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_verify_snapshots(snapshots):
""" Verify snapshot integrity
"""
get_passphrase()
store = cumulus.CumulusStore(options.store)
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()
store = cumulus.CumulusStore(options.store)
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.CumulusStore.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 as 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 = 0o600 | stat.S_IFCHR
else:
mode = 0o600 | 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 as 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 as e:
warn(m, "Error restoring file ownership: %s" % (e, ))
if m.items.type == 'l':
continue
try:
os.chmod(destpath, m.items.mode)
except Exception as e:
warn(m, "Error restoring file permissions: %s" % (e, ))
try:
os.utime(destpath, (time.time(), m.items.mtime))
except Exception as e:
warn(m, "Error restoring file timestamps: %s" % (e, ))
store.cleanup()
def cmd_restore_snapshot(args):
""" Restore a snapshot, or some subset of files from it
"""
get_passphrase()
store = cumulus.CumulusStore(options.store)
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.CumulusStore.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 as 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 = 0o600 | stat.S_IFCHR
else:
mode = 0o600 | 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 as 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 as e:
warn(m, "Error restoring file ownership: %s" % (e,))
if m.items.type == 'l':
continue
try:
os.chmod(destpath, m.items.mode)
except Exception as e:
warn(m, "Error restoring file permissions: %s" % (e,))
try:
os.utime(destpath, (time.time(), m.items.mtime))
except Exception as e:
warn(m, "Error restoring file timestamps: %s" % (e,))
store.cleanup()
