A node being adopted cannot take a web module: every module reachable by
name requires route, the mesh's only provider of it binds the two public
ports, and the predecessor's proxy holds them and serves every public
name there. Stopping the predecessor to break the circle darkens every
name at once, with every certificate to re-obtain in the same window.
So this answers the same provision without binding anything. It provides
route and receives the same contributions file, and writes each
contribution as one route file where the predecessor's file provider
reads, naming the predecessor's own certificate resolver so no
certificate is asked for. It removes a file it wrote when its
contribution goes and never touches a file it did not write — the name
and a marker inside both have to say it is the mesh's.
A step, not a daemon: run-once, re-run by restart-on over the received
file and the settings. The predecessor's dynamic directory is a node
setting, because it is a fact about one machine.
Migration scaffolding with a stated end: assigned only on an adopted
node, deleted when the predecessor's proxy retires.
jschoubben