Expanded Python module for accessing LBS snapshots, and lbs-util.py.

[cumulus.git] / lbs-util.py

diff --git a/lbs-util.py b/lbs-util.py
index d30fbec..33c9c75 100755 (executable)
--- a/lbs-util.py
+++ b/lbs-util.py
@@ -2,17 +2,26 @@
 #
 # Utility for managing LBS archives.
 
-import sys
+import getpass, os, sys
 from optparse import OptionParser
 import lbs
 
 parser = OptionParser(usage="%prog [option]... command [arg]...")
 parser.add_option("-v", action="store_true", dest="verbose", default=False,
                   help="increase verbosity")
+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")
 (options, args) = parser.parse_args(sys.argv[1:])
 
+# 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()
+
 # Run the segment cleaner.
 # Syntax: $0 --localdb=LOCALDB clean
 def cmd_clean(clean_threshold=7.0):
@@ -32,6 +41,79 @@ def cmd_clean(clean_threshold=7.0):
     db.balance_expired_objects()
     db.commit()
 
+# List snapshots stored.
+# Syntax: $0 --data=DATADIR list-snapshots
+def cmd_list_snapshots():
+    store = lbs.LowlevelDataStore(options.store)
+    for s in sorted(store.list_snapshots()):
+        print s
+
+# List size of data needed for each snapshot.
+# Syntax: $0 --data=DATADIR list-snapshot-sizes
+def cmd_list_snapshot_sizes():
+    lowlevel = lbs.LowlevelDataStore(options.store)
+    store = lbs.ObjectStore(lowlevel)
+    previous = set()
+    for s in sorted(lowlevel.list_snapshots()):
+        d = lbs.parse_full(store.load_snapshot(s))
+        segments = d['Segments'].split()
+        (size, added, removed) = (0, 0, 0)
+        for seg in segments:
+            segsize = lowlevel.lowlevel_stat(seg + ".tar.gpg")['size']
+            size += segsize
+            if seg not in previous: added += segsize
+        for seg in previous:
+            if seg not in segments:
+                removed += lowlevel.lowlevel_stat(seg + ".tar.gpg")['size']
+        previous = set(segments)
+        print "%s: %.3f +%.3f -%.3f" % (s, size / 1024.0**2, added / 1024.0**2, removed / 1024.0**2)
+
+# Build checksum list for objects in the given segments
+def cmd_object_checksums(segments):
+    lowlevel = lbs.LowlevelDataStore(options.store)
+    store = lbs.ObjectStore(lowlevel)
+    for s in segments:
+        for (o, data) in store.load_segment(s):
+            csum = lbs.ChecksumCreator().update(data).compute()
+            print "%s/%s:%d:%s" % (s, o, len(data), csum)
+    store.cleanup()
+
+# Read a snapshot file
+def cmd_read_snapshots(snapshots):
+    get_passphrase()
+    lowlevel = lbs.LowlevelDataStore(options.store)
+    store = lbs.ObjectStore(lowlevel)
+    for s in snapshots:
+        d = lbs.parse_full(store.load_snapshot(s))
+        print d
+        print d['Segments'].split()
+    store.cleanup()
+
+# Verify snapshot integrity
+def cmd_verify_snapshots(snapshots):
+    get_passphrase()
+    lowlevel = lbs.LowlevelDataStore(options.store)
+    store = lbs.ObjectStore(lowlevel)
+    for s in snapshots:
+        print "#### Snapshot", s
+        d = lbs.parse_full(store.load_snapshot(s))
+        print "## Root:", d['Root']
+        metadata = lbs.iterate_metadata(store, d['Root'])
+        for m in metadata:
+            if m.fields['type'] != '-': continue
+            print "%s [%d bytes]" % (m.fields['name'], int(m.fields['size']))
+            verifier = lbs.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")
+    store.cleanup()
+
 if len(args) == 0:
     parser.print_usage()
     sys.exit(1)
@@ -39,6 +121,16 @@ cmd = args[0]
 args = args[1:]
 if cmd == 'clean':
     cmd_clean()
+elif cmd == 'list-snapshots':
+    cmd_list_snapshots()
+elif cmd == 'object-sums':
+    cmd_object_checksums(args)
+elif cmd == 'read-snapshots':
+    cmd_read_snapshots(args)
+elif cmd == 'list-snapshot-sizes':
+    cmd_list_snapshot_sizes()
+elif cmd == 'verify-snapshots':
+    cmd_verify_snapshots(args)
 else:
     print "Unknown command:", cmd
     parser.print_usage()