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

ff44cae279bef7997f76db18deb1e41b39f05cb6 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  This change was originally made as part of #17493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

1 files changed, 14 insertions, 7 deletions

diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index b3eb2d61a7..123c48852c 100644
--- a/test/functional/test_framework/util.py
+++ b/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):