Merge #17556: test: Change feature_config_args.py not to rely on strange regtest=0 behavior

ff44cae test: Change feature_config_args.py not to rely on strange regtest=0 behavior (Russell Yanofsky)

Pull request description:

  Update test to simply generate a normal mainnet configuration file instead of using a crazy setup where a regtest=1 config file using an includeconf in the [regtest] section includes another config file that specifies regtest=0, retroactively switching the network to mainnet.

  This setup was fragile and only worked because the triggered InitError happened early enough that none of the ignored [regtest] options mattered (only affecting log output).

  This change was originally made as part of #17493

Top commit has no ACKs.

Tree-SHA512: 3f77305454f04438493dfc2abd78a00434b30869454d1c3f54587b9c1f63239c49c90fb3b4d3a777ad130f2184e0f2dac87cee4cd23c50f1b3496a375943da01

Author: MarcoFalke

test/functional/feature_config_args.py

@@ -7,6 +7,7 @@
 import os
 
 from test_framework.test_framework import BitcoinTestFramework
+from test_framework import util
 
 
 class ConfArgsTest(BitcoinTestFramework):
@@ -42,10 +43,11 @@ def test_config_file_parser(self):
                 conf.write("wallet=foo\n")
             self.nodes[0].assert_start_raises_init_error(expected_msg='Error: Config setting for -wallet only applied on %s network when in [%s] section.' % (self.chain, self.chain))
 
+        main_conf_file_path = os.path.join(self.options.tmpdir, 'node0', 'bitcoin_main.conf')
+        util.write_config(main_conf_file_path, n=0, chain='', extra_config='includeconf={}\n'.format(inc_conf_file_path))
         with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
-            conf.write('regtest=0\n') # mainnet
             conf.write('acceptnonstdtxn=1\n')
-        self.nodes[0].assert_start_raises_init_error(expected_msg='Error: acceptnonstdtxn is not currently supported for main chain')
+        self.nodes[0].assert_start_raises_init_error(extra_args=["-conf={}".format(main_conf_file_path)], expected_msg='Error: acceptnonstdtxn is not currently supported for main chain')
 
         with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
             conf.write('nono\n')

test/functional/test_framework/util.py

@@ -342,16 +342,25 @@ def initialize_datadir(dirname, n, chain):
     datadir = get_datadir_path(dirname, n)
     if not os.path.isdir(datadir):
         os.makedirs(datadir)
-    # Translate chain name to config name
+    write_config(os.path.join(datadir, "bitcoin.conf"), n=n, chain=chain)
+    os.makedirs(os.path.join(datadir, 'stderr'), exist_ok=True)
+    os.makedirs(os.path.join(datadir, 'stdout'), exist_ok=True)
+    return datadir
+
+
+def write_config(config_path, *, n, chain, extra_config=""):
+    # Translate chain subdirectory name to config name
     if chain == 'testnet3':
         chain_name_conf_arg = 'testnet'
         chain_name_conf_section = 'test'
     else:
         chain_name_conf_arg = chain
         chain_name_conf_section = chain
-    with open(os.path.join(datadir, "bitcoin.conf"), 'w', encoding='utf8') as f:
-        f.write("{}=1\n".format(chain_name_conf_arg))
-        f.write("[{}]\n".format(chain_name_conf_section))
+    with open(config_path, 'w', encoding='utf8') as f:
+        if chain_name_conf_arg:
+            f.write("{}=1\n".format(chain_name_conf_arg))
+        if chain_name_conf_section:
+            f.write("[{}]\n".format(chain_name_conf_section))
         f.write("port=" + str(p2p_port(n)) + "\n")
         f.write("rpcport=" + str(rpc_port(n)) + "\n")
         f.write("fallbackfee=0.0002\n")
@@ -364,9 +373,7 @@ def initialize_datadir(dirname, n, chain):
         f.write("upnp=0\n")
         f.write("natpmp=0\n")
         f.write("shrinkdebugfile=0\n")
-        os.makedirs(os.path.join(datadir, 'stderr'), exist_ok=True)
-        os.makedirs(os.path.join(datadir, 'stdout'), exist_ok=True)
-    return datadir
+        f.write(extra_config)
 
 
 def get_datadir_path(dirname, n):