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fix(control): raise the dialect to v9 rather than walk it back to 7

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Reverting the projects layer took CONTROL_VERSION back to 7 with the
verbs it had been raised for. The dialect that number describes is
correct — this build speaks v7's messages again, one for one — but the
number is not, because v8 is already deployed.

A version that moves backwards stops being an identity. A 7 on the wire
would mean "before projects" or "after them" depending on which build
sent it, and the handshake has nothing but the number to tell those
apart: a v8 peer would read our 7 as an older server it may keep
talking to, and every project verb it pushed would fail to decode and
drop the link.

v9 is a number no peer has seen, so a v8 peer is turned away at the
handshake instead. Nothing else changes; every other reference to the
constant is relative to it.

Claude-Session: https://claude.ai/code/session_015q6HRem76HYy33T39bp34c
This commit is contained in:
l0ng-ai
2026-09-07 11:24:37 +08:00
parent 31ce382226
commit 893172f57d
1 changed files with 10 additions and 1 deletions
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crates/tty7-core/src/daemon/control.rs
+10 -1
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@@ -34,7 +34,16 @@ use super::protocol::{MAX_FRAME, read_frame, write_frame};
/// refusing to kill a server it has nothing to replace with — can be exercised /// refusing to kill a server it has nothing to replace with — can be exercised
/// against the v6 servers already deployed. A number is the only way to reach /// against the v6 servers already deployed. A number is the only way to reach
/// that path, and a mismatch nobody can reproduce is a mismatch nobody can fix. /// that path, and a mismatch nobody can reproduce is a mismatch nobody can fix.
pub const CONTROL_VERSION: u32 = 7; ///
/// v8 added the project verbs; v9 takes them back out. The dialect this build
/// speaks is v7's again, message for message, but the number does not go back
/// to 7 with it: v8 is deployed, and a number that moves backwards stops being
/// an identity and becomes a coincidence. A 7 on the wire would then mean
/// either "before projects" or "after them" depending on which build put it
/// there, and the handshake — which has nothing but the number — cannot tell
/// the two apart. A v8 peer meeting this one must be turned away, and only a
/// number it has never seen does that.
pub const CONTROL_VERSION: u32 = 9;
const DIALECT_MARKER: &str = "speaks control v"; const DIALECT_MARKER: &str = "speaks control v";