[ python-Bugs-1548332 ] whichdb too dumb

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Bugs item #1548332, was opened at 2006-08-28 22:51
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Category: Extension Modules
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Curtis Doty (dotysan)
Assigned to: Nobody/Anonymous (nobody)
Summary: whichdb too dumb

Initial Comment:
On my system with db4, I noticed that whichdb doesn't
know anything about more recent database types created
by the bsddb module.

Python 2.4.3 (#1, Jun 13 2006, 11:46:08) 
[GCC 4.1.1 20060525 (Red Hat 4.1.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for
more information.
>>> 
>>> from whichdb import *
>>> import bsddb
>>> 
>>> dbfile= "hash"
>>> bsddb.hashopen( dbfile)
{}
>>> whichdb( dbfile)
'dbhash'
>>> # yay
... 
>>> dbfile= "btree"
>>> bsddb.btopen( dbfile)
{}
>>> whichdb( dbfile)
''
>>> # bah
... 
>>> dbfile= "recno"
>>> bsddb.rnopen( dbfile)
{}
>>> whichdb( dbfile)
''
>>> # humbug!

It looks like both these database types share:

#define DB_BTREEMAGIC   0x053162

So this might be a start:

--- Python-2.5c1/Lib/whichdb.py.orig 2005-02-05
22:57:08.000000000 -0800
+++ Python-2.5c1/Lib/whichdb.py      2006-08-28
13:46:57.000000000 -0700
@@ -109,6 +109,10 @@
     if magic in (0x00061561, 0x61150600):
         return "dbhash"
 
+    # Check for binary tree
+    if magic == 0x00053162:
+        return "btree"
+
     # Unknown
     return ""
 

But alas, I'm not clear on the best way to
differentiate between btree and recno.

The above example is on 2.4 but persists in 2.5.

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