Metered detection polls NetworkManager's Metered property over D-Bus
(feature "metered", default on; builds without D-Bus via
no-default-features). While metered the daemon closes incoming blob
connections and defers every fetch; VARDE_FORCE_METERED=true forces the
state as a kill switch and test hook. Endpoint UDP sockets get DSCP CS1
best-effort by matching bound ports to /proc/net/udp inodes (iroh hides
its fds). systemd socket activation adopts LISTEN_FDS fd 3, readiness
is a hand-rolled sd_notify READY=1 (abstract + path sockets), and
standalone binding still works unchanged. dist/ ships hardened system
and user units (DynamicUser, ProtectSystem=strict, StateDirectory,
RestrictAddressFamilies), a commented config example, scdoc man pages
validated with scdoc, and an untested PKGBUILD skeleton.
Tests: activation-socket round trip via a real fd-3 handoff, READY=1
received on a NOTIFY_SOCKET, metered daemons neither serve nor fetch.
Dependencies: zbus (optional, feature-gated D-Bus client for the
NetworkManager metered flag).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Three-crate workspace per SPECS.md. varde-proto defines the full JSON
Lines protocol (requests, envelopes, structured errors, events) with
string-typed hashes so the crate carries no iroh dependency. The daemon
binds its unix socket, loads config with flags > env > file > defaults
precedence, and answers status/list; everything else returns a
structured "unimplemented" error. varde-ctl maps subcommands 1:1 onto
requests and round-trips status against a real daemon in the tests.
Dependencies: serde/serde_json (wire format), tokio (async runtime and
unix sockets), tracing/tracing-subscriber (structured logging), toml
(config file), anyhow (binary-edge errors), thiserror (reserved for
library errors), clap (ctl flag parsing, per spec), tempfile (dev-only,
ephemeral test dirs).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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