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fix: tmux remain-on-exit prevents session loss when Claude exits

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Previously, when Claude exited inside tmux (exitCode=0 or crash), tmux
destroyed the entire session — losing buffer, history, and causing crash
loops on restart attempts. Now:

- Set remain-on-exit on for all tmux sessions
- Detect dead panes via #{pane_dead} instead of assuming session is gone
- Respawn dead panes with tmux respawn-pane -k (preserves session)
- Applied to both startInteractive and startShell paths

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
arkon
2026-02-19 22:37:45 +01:00
co-authored by Claude Opus 4.6
parent 1b21e1b8d8
commit db3893d608
5 changed files with 114 additions and 7 deletions
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src/session.ts
+34 -5
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@@ -849,14 +849,29 @@ export class Session extends EventEmitter {
// If mux wrapping is enabled, create or attach to a mux session
if (this._useMux && this._mux) {
try {
// Verify stale mux session — tmux destroys session when command exits
// (remain-on-exit is off), but _muxSession reference persists
// Verify stale mux session — tmux may have been destroyed (e.g., killed externally)
if (this._muxSession && !this._mux.muxSessionExists(this._muxSession.muxName)) {
console.log('[Session] Stale mux session detected (tmux gone):', this._muxSession.muxName);
this._muxSession = null;
}
// Check if session exists but pane is dead (remain-on-exit keeps it alive)
// Respawn the pane instead of creating a whole new session — preserves tmux scrollback
let needsNewSession = false;
if (this._muxSession && this._mux.isPaneDead(this._muxSession.muxName)) {
console.log('[Session] Dead pane detected, respawning:', this._muxSession.muxName);
const newPid = await this._mux.respawnPane(this.id, this.workingDir, 'claude', this._niceConfig, this._model);
if (!newPid) {
console.error('[Session] Failed to respawn pane, will create new session');
needsNewSession = true;
} else {
// Wait a moment for the respawned process to fully start
await new Promise(resolve => setTimeout(resolve, MUX_STARTUP_DELAY_MS));
}
}
// Check if we already have a mux session (restored session)
const isRestoredSession = this._muxSession !== null;
const isRestoredSession = this._muxSession !== null && !needsNewSession;
if (isRestoredSession) {
console.log('[Session] Attaching to existing mux session:', this._muxSession!.muxName);
} else {
@@ -1134,13 +1149,27 @@ export class Session extends EventEmitter {
// If mux wrapping is enabled, create or attach to a mux session
if (this._useMux && this._mux) {
try {
// Verify stale mux session — tmux destroys session when command exits
// Verify stale mux session — tmux may have been destroyed externally
if (this._muxSession && !this._mux.muxSessionExists(this._muxSession.muxName)) {
console.log('[Session] Stale mux session detected (tmux gone):', this._muxSession.muxName);
this._muxSession = null;
}
// Check if session exists but pane is dead (remain-on-exit keeps it alive)
let needsNewSession = false;
if (this._muxSession && this._mux.isPaneDead(this._muxSession.muxName)) {
console.log('[Session] Dead pane detected, respawning:', this._muxSession.muxName);
const newPid = await this._mux.respawnPane(this.id, this.workingDir, 'shell', this._niceConfig);
if (!newPid) {
console.error('[Session] Failed to respawn pane, will create new session');
needsNewSession = true;
} else {
await new Promise(resolve => setTimeout(resolve, MUX_STARTUP_DELAY_MS));
}
}
// Check if we already have a mux session (restored session)
const isRestoredSession = this._muxSession !== null;
const isRestoredSession = this._muxSession !== null && !needsNewSession;
if (isRestoredSession) {
console.log('[Session] Attaching to existing mux session:', this._muxSession!.muxName);
} else {