to find the possible session directories with names starting with %Y-%m-%d- (for example,
2012-01-23-) and employs the one with the latest timestamp.  For example:

johnny:/Volumes/data/lldb/svn/latest/test $ ./redo.py 
Using session dir path: /Volumes/data/lldb/svn/latest/test/2012-01-23-11_28_30
adding filterspec: DisassembleRawDataTestCase.test_disassemble_raw_data
Running ./dotest.py  -C clang  -v -t -f DisassembleRawDataTestCase.test_disassemble_raw_data
LLDB build dir: /Volumes/data/lldb/svn/latest/build/Debug
LLDB-108
Path: /Volumes/data/lldb/svn/latest
URL: https://johnny@llvm.org/svn/llvm-project/lldb/trunk
Repository Root: https://johnny@llvm.org/svn/llvm-project
Repository UUID: 91177308-0d34-0410-b5e6-96231b3b80d8
Revision: 148710
Node Kind: directory
Schedule: normal
Last Changed Author: gclayton
Last Changed Rev: 148650
Last Changed Date: 2012-01-21 18:55:08 -0800 (Sat, 21 Jan 2012)



Session logs for test failures/errors/unexpected successes will go into directory '2012-01-23-17_04_48'
Command invoked: python ./dotest.py -C clang -v -t -f DisassembleRawDataTestCase.test_disassemble_raw_data

Configuration:  compiler=clang
----------------------------------------------------------------------
Collected 1 test

Change dir to: /Volumes/data/lldb/svn/latest/test/python_api/disassemble-raw-data
1: test_disassemble_raw_data (TestDisassembleRawData.DisassembleRawDataTestCase)
   Test disassembling raw bytes with the API. ... 
Raw bytes:    ['0x48', '0x89', '0xe5']
Disassembled: movq   %rsp, %rbp
ok
Restore dir to: /Volumes/data/lldb/svn/latest/test

----------------------------------------------------------------------
Ran 1 test in 0.233s

OK

llvm-svn: 148766