From: Peter Iannucci <iannucci@mit.edu>
Date: Wed, 25 Mar 2009 03:24:00 +0000 (-0400)
Subject: LVM metadata reader script in lvm-backup-reader
X-Git-Url: http://xvm.mit.edu/gitweb/invirt/scripts/lvm-backup-reader.git/commitdiff_plain/f123965b7ce149572fe4c9172089e848c956dc5e

LVM metadata reader script in lvm-backup-reader

svn path=/trunk/scripts/lvm-backup-reader/; revision=2270
---

f123965b7ce149572fe4c9172089e848c956dc5e
diff --git a/lvm-backup-reader.py b/lvm-backup-reader.py
new file mode 100755
index 0000000..0f5e668
--- /dev/null
+++ b/lvm-backup-reader.py
@@ -0,0 +1,44 @@
+import re
+
+def complete(value):
+    if value.startswith('[') and not value.endswith(']'):
+        return False
+    return True
+
+def interpret(value):
+    return eval(value) # good enough for now
+
+class Metadata:
+    def __init__(self, fn):
+        self.text = open(fn, 'r').read()
+        lines = filter(lambda l: not l.startswith("#") and not l.strip()=='', self.text.splitlines())
+        d = {}
+        parent = []
+        node = d
+        mode = 0
+        for l in lines:
+            if mode == 0:
+                if l.strip() == '}':
+                    node = parent[-1]
+                    del parent[-1]
+                elif l.strip().endswith('{'):
+                    name = l.strip()[:-1].strip()
+                    parent.append(node)
+                    child = {}
+                    node[name] = child
+                    node = child
+                else:
+                    key, value = re.search(r'\t*(\S*) = (.*?)(\s*# .*)?$', l).groups()[0:2]
+                    if not complete(value):
+                        mode = 1
+                    else:
+                        node[key] = interpret(value)
+            elif mode == 1:
+                value += re.search(r'\t*(.*?)( *# .*)?$', l).group(0).strip()
+                if complete(value):
+                    node[key] = interpret(value)
+                    mode = 0
+        self.d = d
+
+import pprint
+pprint.pprint(Metadata('xenvg-backup').d)