new conversion utility: scripts/tx-btc2bch.py

- Beginning with v0.9.5, BCH and BTC transaction files differ.
  This utility converts old BCH transaction files to the new format.

scripts/tx-btc2bch.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+#
+# mmgen = Multi-Mode GENerator, command-line Bitcoin cold storage solution
+# Copyright (C)2013-2017 Philemon <mmgen-py@yandex.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+tx-btc2bch: Convert MMGen transaction files from BTC to BCH format
+"""
+
+from mmgen.common import *
+
+opts_data = lambda: {
+	'desc': """Convert {pnm} transaction files from BTC to BCH format""".format(pnm=g.proj_name),
+	'usage':'[opts] [mmgen transaction file]',
+	'options': """
+-h, --help         Print this help message
+--, --longhelp     Print help message for long options (common options)
+-v, --verbose      Produce more verbose output
+"""
+}
+
+cmd_args = opts.init(opts_data)
+
+if g.coin != 'BTC':
+	die(1,"This program must be run with --coin set to 'BTC'")
+
+if len(cmd_args) != 1: opts.usage()
+
+from mmgen.protocol import CoinProtocol
+
+import mmgen.tx
+tx = mmgen.tx.MMGenTX(cmd_args[0])
+
+if opt.verbose:
+	gmsg('Original transaction is in {} format'.format(g.coin))
+
+g.coin = 'BCH'
+g.proto = CoinProtocol(g.coin,g.testnet)
+
+reload(sys.modules['mmgen.tx'])
+
+if opt.verbose:
+	gmsg('Converting transaction to {} format'.format(g.coin))
+
+tx.inputs.convert_coin(verbose=opt.verbose)
+tx.outputs.convert_coin(verbose=opt.verbose)
+
+tx.desc = 'converted transaction'
+tx.write_to_file(ask_write=False,ask_overwrite=False)