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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision 91e742fb6bb59c5a787f4b8a2584fdab4d82dd73 authored by Tim Peters on 27 February 2006, 17:47:02 UTC, committed by Tim Peters on 27 February 2006, 17:47:02 UTC
Patch 1413181, by Gabriel Becedillas. PyThreadState_Delete(): if the auto-GIL-state machinery knows about the thread state, forget it (since the thread state is being deleted, continuing to remember it can't help, but can hurt if another thread happens to get created with the same thread id).
1 parent 05b9254
Tip revision: 91e742fb6bb59c5a787f4b8a2584fdab4d82dd73 authored by Tim Peters on 27 February 2006, 17:47:02 UTC
Merge rev 42607 from the trunk.
Merge rev 42607 from the trunk.
Tip revision: 91e742f
whichdb.py
# !/usr/bin/env python
"""Guess which db package to use to open a db file."""
import os
import struct
import sys
try:
import dbm
_dbmerror = dbm.error
except ImportError:
dbm = None
# just some sort of valid exception which might be raised in the
# dbm test
_dbmerror = IOError
def whichdb(filename):
"""Guess which db package to use to open a db file.
Return values:
- None if the database file can't be read;
- empty string if the file can be read but can't be recognized
- the module name (e.g. "dbm" or "gdbm") if recognized.
Importing the given module may still fail, and opening the
database using that module may still fail.
"""
# Check for dbm first -- this has a .pag and a .dir file
try:
f = open(filename + os.extsep + "pag", "rb")
f.close()
# dbm linked with gdbm on OS/2 doesn't have .dir file
if not (dbm.library == "GNU gdbm" and sys.platform == "os2emx"):
f = open(filename + os.extsep + "dir", "rb")
f.close()
return "dbm"
except IOError:
# some dbm emulations based on Berkeley DB generate a .db file
# some do not, but they should be caught by the dbhash checks
try:
f = open(filename + os.extsep + "db", "rb")
f.close()
# guarantee we can actually open the file using dbm
# kind of overkill, but since we are dealing with emulations
# it seems like a prudent step
if dbm is not None:
d = dbm.open(filename)
d.close()
return "dbm"
except (IOError, _dbmerror):
pass
# Check for dumbdbm next -- this has a .dir and a .dat file
try:
# First check for presence of files
os.stat(filename + os.extsep + "dat")
size = os.stat(filename + os.extsep + "dir").st_size
# dumbdbm files with no keys are empty
if size == 0:
return "dumbdbm"
f = open(filename + os.extsep + "dir", "rb")
try:
if f.read(1) in ["'", '"']:
return "dumbdbm"
finally:
f.close()
except (OSError, IOError):
pass
# See if the file exists, return None if not
try:
f = open(filename, "rb")
except IOError:
return None
# Read the start of the file -- the magic number
s16 = f.read(16)
f.close()
s = s16[0:4]
# Return "" if not at least 4 bytes
if len(s) != 4:
return ""
# Convert to 4-byte int in native byte order -- return "" if impossible
try:
(magic,) = struct.unpack("=l", s)
except struct.error:
return ""
# Check for GNU dbm
if magic == 0x13579ace:
return "gdbm"
# Check for old Berkeley db hash file format v2
if magic in (0x00061561, 0x61150600):
return "bsddb185"
# Later versions of Berkeley db hash file have a 12-byte pad in
# front of the file type
try:
(magic,) = struct.unpack("=l", s16[-4:])
except struct.error:
return ""
# Check for BSD hash
if magic in (0x00061561, 0x61150600):
return "dbhash"
# Unknown
return ""
if __name__ == "__main__":
for filename in sys.argv[1:]:
print whichdb(filename) or "UNKNOWN", filename
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