Fix sys.path for scripts in contrib.

Patch by: Jon Foster <[email protected]>

The problem is that the programs in contrib automatically find the
cvs2svn libraries by taking the script path, then chopping off the
last directory component.  If the full isn't specified, there isn't a
"last directory component" to chop off.  The fix is just to insert a
call to abspath() in the appropriate place.

After fixing that, there's a similar-but-different bug when using
pychecker:

> ~/cvs2svn-trunk/contrib$ pychecker destroy_repository.py
> Processing destroy_repository...
> ImportError: No module named cvs2svn_lib.key_generator

In this case, the problem is that sys.argv[0] points to pychecker,
not destroy_repository.py.  This can be fixed by using __file__
instead, which is a special Python variable that gives the path
to the current source file.

git-svn-id: http://cvs2svn.tigris.org/svn/cvs2svn/trunk@5083 be7e6eca-30d4-0310-a8e5-ac0d63af7087

Author: mhagger

contrib/destroy_repository.py

@@ -108,7 +108,7 @@
 import shutil
 import re
 
-sys.path.insert(0, os.path.dirname(os.path.dirname(sys.argv[0])))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from cvs2svn_lib.key_generator import KeyGenerator
 import cvs2svn_rcsparse

contrib/find_illegal_filenames.py

@@ -27,7 +27,7 @@
 import sys
 import os
 
-sys.path.insert(0, os.path.dirname(os.path.dirname(sys.argv[0])))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from cvs2svn_lib.common import FatalError
 from cvs2svn_lib.collect_data import verify_filename_legal

contrib/rcs_file_filter.py

@@ -22,7 +22,7 @@
 import os
 import time
 
-sys.path.insert(0, os.path.dirname(os.path.dirname(sys.argv[0])))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 import cvs2svn_rcsparse
 

contrib/show_db.py

@@ -8,7 +8,7 @@
 import cPickle as pickle
 from cStringIO import StringIO
 
-sys.path.insert(0, os.path.dirname(os.path.dirname(sys.argv[0])))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from cvs2svn_lib import config
 from cvs2svn_lib.context import Ctx

contrib/shrink_test_case.py

@@ -38,7 +38,7 @@
 import optparse
 from cStringIO import StringIO
 
-sys.path.insert(0, os.path.dirname(os.path.dirname(sys.argv[0])))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from cvs2svn_lib.key_generator import KeyGenerator