mirror of
https://github.com/jart/cosmopolitan.git
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147 lines
3.9 KiB
Python
Executable file
147 lines
3.9 KiB
Python
Executable file
#!/usr/bin/env python3
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"""
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Synopsis: %(prog)s [-h|-b|-g|-r|-a|-d] [ picklefile ] dbfile
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Read the given picklefile as a series of key/value pairs and write to a new
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database. If the database already exists, any contents are deleted. The
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optional flags indicate the type of the output database:
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-a - open using dbm (open any supported format)
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-b - open as bsddb btree file
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-d - open as dbm.ndbm file
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-g - open as dbm.gnu file
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-h - open as bsddb hash file
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-r - open as bsddb recno file
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The default is hash. If a pickle file is named it is opened for read
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access. If no pickle file is named, the pickle input is read from standard
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input.
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Note that recno databases can only contain integer keys, so you can't dump a
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hash or btree database using db2pickle.py and reconstitute it to a recno
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database with %(prog)s unless your keys are integers.
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"""
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import getopt
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try:
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import bsddb
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except ImportError:
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bsddb = None
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try:
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import dbm.ndbm as dbm
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except ImportError:
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dbm = None
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try:
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import dbm.gnu as gdbm
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except ImportError:
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gdbm = None
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try:
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import dbm.ndbm as anydbm
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except ImportError:
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anydbm = None
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import sys
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try:
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import pickle as pickle
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except ImportError:
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import pickle
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prog = sys.argv[0]
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def usage():
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sys.stderr.write(__doc__ % globals())
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def main(args):
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try:
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opts, args = getopt.getopt(args, "hbrdag",
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["hash", "btree", "recno", "dbm", "anydbm",
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"gdbm"])
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except getopt.error:
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usage()
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return 1
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if len(args) == 0 or len(args) > 2:
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usage()
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return 1
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elif len(args) == 1:
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pfile = sys.stdin
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dbfile = args[0]
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else:
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try:
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pfile = open(args[0], 'rb')
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except IOError:
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sys.stderr.write("Unable to open %s\n" % args[0])
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return 1
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dbfile = args[1]
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dbopen = None
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for opt, arg in opts:
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if opt in ("-h", "--hash"):
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try:
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dbopen = bsddb.hashopen
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except AttributeError:
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sys.stderr.write("bsddb module unavailable.\n")
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return 1
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elif opt in ("-b", "--btree"):
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try:
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dbopen = bsddb.btopen
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except AttributeError:
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sys.stderr.write("bsddb module unavailable.\n")
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return 1
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elif opt in ("-r", "--recno"):
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try:
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dbopen = bsddb.rnopen
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except AttributeError:
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sys.stderr.write("bsddb module unavailable.\n")
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return 1
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elif opt in ("-a", "--anydbm"):
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try:
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dbopen = anydbm.open
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except AttributeError:
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sys.stderr.write("dbm module unavailable.\n")
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return 1
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elif opt in ("-g", "--gdbm"):
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try:
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dbopen = gdbm.open
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except AttributeError:
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sys.stderr.write("dbm.gnu module unavailable.\n")
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return 1
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elif opt in ("-d", "--dbm"):
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try:
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dbopen = dbm.open
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except AttributeError:
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sys.stderr.write("dbm.ndbm module unavailable.\n")
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return 1
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if dbopen is None:
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if bsddb is None:
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sys.stderr.write("bsddb module unavailable - ")
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sys.stderr.write("must specify dbtype.\n")
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return 1
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else:
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dbopen = bsddb.hashopen
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try:
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db = dbopen(dbfile, 'c')
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except bsddb.error:
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sys.stderr.write("Unable to open %s. " % dbfile)
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sys.stderr.write("Check for format or version mismatch.\n")
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return 1
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else:
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for k in list(db.keys()):
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del db[k]
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while 1:
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try:
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(key, val) = pickle.load(pfile)
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except EOFError:
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break
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db[key] = val
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db.close()
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pfile.close()
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return 0
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if __name__ == "__main__":
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sys.exit(main(sys.argv[1:]))
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