init: drop -upnp

This was slated for removal in 30.0, so remove it.

Author: fanquake

doc/release-notes-32500.md

@@ -0,0 +1,3 @@
+### Updated Settings
+
+- The `-upnp` setting has now been fully removed. Use `-natpmp` instead. (#32500)

src/init.cpp

@@ -561,8 +561,6 @@ void SetupServerArgs(ArgsManager& argsman, bool can_listen_ipc)
     argsman.AddArg("-peertimeout=<n>", strprintf("Specify a p2p connection timeout delay in seconds. After connecting to a peer, wait this amount of time before considering disconnection based on inactivity (minimum: 1, default: %d)", DEFAULT_PEER_CONNECT_TIMEOUT), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CONNECTION);
     argsman.AddArg("-torcontrol=<ip>:<port>", strprintf("Tor control host and port to use if onion listening enabled (default: %s). If no port is specified, the default port of %i will be used.", DEFAULT_TOR_CONTROL, DEFAULT_TOR_CONTROL_PORT), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-torpassword=<pass>", "Tor control port password (default: empty)", ArgsManager::ALLOW_ANY | ArgsManager::SENSITIVE, OptionsCategory::CONNECTION);
-    // UPnP support was dropped. We keep `-upnp` as a hidden arg to display a more user friendly error when set. TODO: remove (here and below) for 30.0. NOTE: removing this option may prevent the GUI from starting, see https://github.com/bitcoin-core/gui/issues/843.
-    argsman.AddArg("-upnp", "", ArgsManager::ALLOW_ANY, OptionsCategory::HIDDEN);
     argsman.AddArg("-natpmp", strprintf("Use PCP or NAT-PMP to map the listening port (default: %u)", DEFAULT_NATPMP), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-whitebind=<[permissions@]addr>", "Bind to the given address and add permission flags to the peers connecting to it. "
         "Use [host]:port notation for IPv6. Allowed permissions: " + Join(NET_PERMISSIONS_DOC, ", ") + ". "
@@ -791,32 +789,6 @@ void InitParameterInteraction(ArgsManager& args)
             LogInfo("parameter interaction: -onlynet excludes IPv4 and IPv6 -> setting -dnsseed=0\n");
         }
     }
-
-    // If settings.json contains a "upnp" option, migrate it to use "natpmp" instead
-    bool settings_changed{false}; // Whether settings.json file needs to be rewritten
-    args.LockSettings([&](common::Settings& settings) {
-        if (auto* upnp{common::FindKey(settings.rw_settings, "upnp")}) {
-            if (common::FindKey(settings.rw_settings, "natpmp") == nullptr) {
-                LogWarning(R"(Adding "natpmp": %s to settings.json to replace obsolete "upnp" setting)", upnp->write());
-                settings.rw_settings["natpmp"] = *upnp;
-            }
-            LogWarning(R"(Removing obsolete "upnp" setting from settings.json)");
-            settings.rw_settings.erase("upnp");
-            settings_changed = true;
-        }
-    });
-    if (settings_changed) args.WriteSettingsFile();
-
-    // We dropped UPnP support but kept the arg as hidden for now to display a friendlier error to user who has the
-    // option in their config, and migrate the setting to -natpmp.
-    if (const auto arg{args.GetBoolArg("-upnp")}) {
-        std::string message;
-        if (args.SoftSetBoolArg("-natpmp", *arg)) {
-            message = strprintf(" Substituting '-natpmp=%s'.", *arg);
-        }
-        LogWarning("Option '-upnp=%s' is given but UPnP support was dropped in version 29.0.%s",
-                *arg, message);
-    }
 }
 
 /**