max / makenotwork

server: MNW_CHECK_CONFIG mode — validate config and exit, no side effects Loads Config::from_env() with the process environment and exits 0 (prints "MNW_CONFIG_CHECK: ok") or 1 (prints the error), with no DB connection, no migrations, and no socket bind. Backs Sando's opt-in pre-swap config-drift guard (run on the target with its env sourced, before the symlink swap) and is handy by hand for validating a node's env. The stable sentinel line lets a caller tell a genuine config error from a binary too old to know the mode. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Max Johnson <me@maxj.phd> · 2026-07-08 23:57 UTC

Commit: 692e0e87159400456d22fee38c0c08b374d4badf

Parent: 942b5bb

1 file changed, +22 insertions, -0 deletions

M server/src/main.rs +22

			@@ -63,6 +63,28 @@ async fn main() {
63	63		return;
64	64		}
65	65
	66	+	// Config-only validation mode. Loads Config::from_env() with the process
	67	+	// environment and exits — no DB connection, no migrations, no socket bind —
	68	+	// so a required var missing on a target (e.g. CDN_BASE_URL) is caught
	69	+	// before a deploy swaps the `current` symlink and restarts into a crash
	70	+	// loop. Sando's pre-swap config-drift guard runs `MNW_CHECK_CONFIG=1
	71	+	// <binary>` on the target with its env sourced; also handy by hand. Prints a
	72	+	// stable sentinel line so a caller can distinguish a genuine config error
	73	+	// (exit 1) from a binary too old to support this mode (which would ignore
	74	+	// the var and fall through to normal startup).
	75	+	if std::env::var("MNW_CHECK_CONFIG").is_ok() {
	76	+	match Config::from_env() {
	77	+	Ok(_) => {
	78	+	println!("MNW_CONFIG_CHECK: ok");
	79	+	std::process::exit(0);
	80	+	}
	81	+	Err(e) => {
	82	+	eprintln!("MNW_CONFIG_CHECK: error: {e}");
	83	+	std::process::exit(1);
	84	+	}
	85	+	}
	86	+	}
	87	+
66	88		let config = Config::from_env().expect("Failed to load configuration");
67	89		tracing::info!("Configuration loaded");
68	90