From 0209aca5ebd868bf1137822f0b7046901557c008 Mon Sep 17 00:00:00 2001
From: Don Anderson <dda@ddanderson.com>
Date: Fri, 11 Dec 2015 09:47:25 -0500
Subject: WT-2276. Added tool to crack and display contents of checkpoint
 'addr' cookie.  Similar to 'wt list -c', but usable in situations where it
 may be difficult to run 'wt' (e.g. during a debugging session).

---
 tools/wt_ckpt_decode.py | 103 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 tools/wt_ckpt_decode.py

(limited to 'tools')

diff --git a/tools/wt_ckpt_decode.py b/tools/wt_ckpt_decode.py
new file mode 100644
index 00000000000..b27a0ae5297
--- /dev/null
+++ b/tools/wt_ckpt_decode.py
@@ -0,0 +1,103 @@
+#!/usr/bin/env python
+#
+# Public Domain 2014-2015 MongoDB, Inc.
+# Public Domain 2008-2014 WiredTiger, Inc.
+#
+# This is free and unencumbered software released into the public domain.
+#
+# Anyone is free to copy, modify, publish, use, compile, sell, or
+# distribute this software, either in source code form or as a compiled
+# binary, for any purpose, commercial or non-commercial, and by any
+# means.
+#
+# In jurisdictions that recognize copyright laws, the author or authors
+# of this software dedicate any and all copyright interest in the
+# software to the public domain. We make this dedication for the benefit
+# of the public at large and to the detriment of our heirs and
+# successors. We intend this dedication to be an overt act of
+# relinquishment in perpetuity of all present and future rights to this
+# software under copyright law.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+
+# Decode a checkpoint 'addr'
+
+import os, sys, getopt
+
+def usage():
+    print 'Usage:\n\
+  $ python .../tools/wt_ckpt_decode.py [ -a allocsize ] addr...\n\
+\n\
+addr is a hex string\n\
+'
+
+def err_usage(msg):
+        print 'wt_ckpt_decode.py: ERROR: ' + msg
+        usage()
+        sys.exit(False)
+
+# Set paths
+wt_disttop = sys.path[0]
+while not os.path.isdir(wt_disttop + '/build_posix'):
+    if wt_disttop == '/':
+        err_usage('current dir not in wiredtiger development directory')
+    wt_disttop = os.path.dirname(wt_disttop)
+sys.path.insert(1, os.path.join(wt_disttop, 'lang', 'python', 'wiredtiger'))
+
+from packing import pack, unpack
+
+def show_one(label, value):
+    l = 16 - len(label)
+    l = l if l > 1 else 1
+    print '    {0}{1}{2:10d}  (0x{2:x})'.format(label, (' ' * l), value, value)
+    
+def show_triple(triple, name, allocsize):
+    off = triple[0]
+    size = triple[1]
+    csum = triple[2]
+    if size == 0:
+        off = -1
+        csum = 0
+    show_one(name + ' offset', (off + 1) * allocsize)
+    show_one(name + ' size', (size) * allocsize)
+    show_one(name + ' cksum', csum)
+    print ''
+
+def decode_arg(arg, allocsize):
+    addr = arg.decode("hex")
+    version = ord(addr[0])
+    print arg + ': '
+    if version != 1:
+        print '**** ERROR: unknown version ' + str(version)
+    addr = addr[1:]
+    result = unpack('iiiiiiiiiiiiii',addr)
+    if len(result) != 14:
+        print '**** ERROR: result len unexpected: ' + str(len(result))
+    show_triple(result[0:3], 'root', allocsize)
+    show_triple(result[3:6], 'alloc', allocsize)
+    show_triple(result[6:9], 'avail', allocsize)
+    show_triple(result[9:12], 'discard', allocsize)
+    file_size = result[12]
+    ckpt_size = result[13]
+    show_one('file size', file_size)
+    show_one('checkpoint size', ckpt_size)
+
+#decode_arg('018281e420f2fa4a8381e40c5855ca808080808080e22fc0e20fc0', 4096)
+    
+allocsize = 4096
+try:
+    opts, args = getopt.getopt(sys.argv[1:], "a:", ["allocsize"])
+except getopt.GetoptError as err:
+    err_usage(str(err))
+for o, a in opts:
+    if o == '-a':
+        allocsize = int(a)
+    
+for arg in args:
+    decode_arg(arg, allocsize)
-- 
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