Much gnashing of teeth (and a removal of Mercurial installed through snap) later, computers finally started to comply. Here's the patch that's similar to the archive that I linked to earlier.
# HG changeset patch
# User Guus der Kinderen <
guus.der...@gmail.com>
# Date 1703757755 -3600
# Thu Dec 28 11:02:35 2023 +0100
# Node ID e5dea4d2c9af19c968e6f95c44abd3275203eeed
# Parent 8566a423da88f8db420bade5a068c90c2c61b074
mod_pubsub_serverinfo: New module that uses pub/sub to make accessible server info
This first implemetnation is laughably simple: it only adds a disco#info feature. This flags 'opt-in' for inclusion of local domain names in the data exposed by other domains (per the domain), which will allow servers to be listed in the XMPP Network Graph at
https://xmppnetwork.goodbytes.im Hopefully, this bare-boned implementation acts as a stepping stone for future improvements.
diff -r 8566a423da88 -r e5dea4d2c9af mod_pubsub_serverinfo/README.markdown
--- /dev/null
Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_pubsub_serverinfo/README.markdown
Thu Dec 28 11:02:35 2023 +0100
@@ -0,0 +1,8 @@
+---
+labels:
+- 'Statistics'
+...
+
+Exposes server information over Pub/Sub per ProtoXEP: PubSub Server Information.
+
+This initial version only announces support (used to 'opt-in', per the XEP). It does not publish any data. This is intended to be a future addition to this mod.
diff -r 8566a423da88 -r e5dea4d2c9af mod_pubsub_serverinfo/mod_pubsub_serverinfo.lua
--- /dev/null
Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_pubsub_serverinfo/mod_pubsub_serverinfo.lua
Thu Dec 28 11:02:35 2023 +0100
@@ -0,0 +1,1 @@
+module:add_feature("urn:xmpp:serverinfo:0");