fix(vm-probe): restore warm probe metrics via V2 runtime sync

Author: Hyeoncheol Kim

e2e/lesson-probe-regression.e2e.spec.ts

@@ -210,6 +210,8 @@ async function ensureActiveWindowIndexAtLeast(page: Page, minIndex: number) {
 }
 
 async function ensureWindowNameEquals(page: Page, expectedName: string) {
+  await ensureWindowCountAtLeast(page, 1);
+
   const currentName = ((await getVmBridgeStatus(page)).metrics.windowName ?? '').trim();
   if (currentName === expectedName) {
     return;
@@ -225,6 +227,8 @@ async function ensureWindowNameEquals(page: Page, expectedName: string) {
 }
 
 async function ensureSessionNameEquals(page: Page, expectedName: string) {
+  await ensureSessionCountAtLeast(page, 1);
+
   const currentName = ((await getVmBridgeStatus(page)).metrics.sessionName ?? '').trim();
   if (currentName === expectedName) {
     return;

public/vm/alpine-tmux-flat/2f76315c.bin.zst

@@ -188,6 +188,19 @@ export function usePracticeVmBootstrap({
       emulatorRef.current.serial0_send(data);
     });
 
+    const markBridgeReadyIfNeeded = () => {
+      if (vmInternalBridgeReadyRef.current || !emulatorRef.current) {
+        return;
+      }
+      vmInternalBridgeReadyRef.current = true;
+      if (vmWarmBannerPendingRef.current) {
+        emulatorRef.current.serial0_send(`${BANNER_TRIGGER_COMMAND}\n`);
+        vmWarmBannerPendingRef.current = false;
+      }
+      sendInternalCommand(terminalGeometrySyncCommand);
+      requestBootstrapProbe();
+    };
+
     const writeByte = (value: number) => {
       terminal.write(Uint8Array.of(value & 0xff));
       const outputCaptureResult = consumeTerminalOutputByte(value, {
@@ -197,6 +210,16 @@ export function usePracticeVmBootstrap({
       lineBufferRef.current = outputCaptureResult.nextState.lineBuffer;
       outputEscapeSequenceRef.current = outputCaptureResult.nextState.inEscapeSequence;
 
+      // Shell prompts are usually rendered without a trailing newline.
+      // Detect prompt state from the in-progress line buffer so internal probes can start.
+      const promptLine = stripAnsi(outputCaptureResult.nextState.lineBuffer).replace(/\r/g, '');
+      const hasPromptInBuffer = /[#$]\s*$/.test(promptLine.trimEnd());
+      if (hasPromptInBuffer) {
+        setVmStatusText(t('부팅 완료, 명령 입력 가능'));
+        setVmStatus('running');
+        markBridgeReadyIfNeeded();
+      }
+
       if (outputCaptureResult.completedLine === null) {
         return;
       }
@@ -218,14 +241,8 @@ export function usePracticeVmBootstrap({
         setVmStatus('running');
       }
 
-      if (hasShellPrompt && !vmInternalBridgeReadyRef.current && emulatorRef.current) {
-        vmInternalBridgeReadyRef.current = true;
-        if (vmWarmBannerPendingRef.current) {
-          emulatorRef.current.serial0_send(`${BANNER_TRIGGER_COMMAND}\n`);
-          vmWarmBannerPendingRef.current = false;
-        }
-        sendInternalCommand(terminalGeometrySyncCommand);
-        requestBootstrapProbe();
+      if (hasShellPrompt) {
+        markBridgeReadyIfNeeded();
       }
     };
 

public/vm/alpine-tmux-fs.json

@@ -19,11 +19,8 @@ describe('probeCommands', () => {
   it('keeps periodic probe command short and stable', () => {
     expect(PROBE_TRIGGER_COMMAND).toBe(BASE_PROBE_TRIGGER_COMMAND);
     expect(PROBE_LOOP_START_COMMAND).toContain(BASE_PROBE_TRIGGER_COMMAND);
-    expect(PROBE_TRIGGER_COMMAND).toContain(PROBE_STATE_MARKER);
-    expect(PROBE_TRIGGER_COMMAND).toContain('tmux list-sessions -F');
-    expect(PROBE_TRIGGER_COMMAND).toContain('tmux list-windows -a -F');
-    expect(PROBE_TRIGGER_COMMAND).toContain('tmux list-panes -a -F');
-    expect(PROBE_TRIGGER_COMMAND).toContain('TMUXWEB_SEARCH_COUNT');
+    expect(PROBE_TRIGGER_COMMAND).toContain('/usr/bin/tmux-tuto-probe');
+    expect(PROBE_TRIGGER_COMMAND).not.toContain(PROBE_STATE_MARKER);
     expectValidShellSyntax(PROBE_TRIGGER_COMMAND);
   });
 

public/vm/alpine-tmux-ready.bin.zst

@@ -1,48 +1,8 @@
 export const PROBE_STATE_MARKER = 'TMUXWEB_STATE_V2';
 
-const PROBE_STATE_TRIGGER_LINES = [
-  'TMUXWEB_TMUX=0',
-  'if tmux -V >/dev/null 2>&1; then TMUXWEB_TMUX=1; fi',
-  'TMUXWEB_SESSION=-1',
-  'TMUXWEB_WINDOW=-1',
-  'TMUXWEB_PANE=-1',
-  'TMUXWEB_MODE=0',
-  'TMUXWEB_SESSION_NAME=""',
-  'TMUXWEB_WINDOW_NAME=""',
-  'TMUXWEB_ACTIVE_WINDOW=-1',
-  'TMUXWEB_LAYOUT=""',
-  'TMUXWEB_ZOOMED=0',
-  'TMUXWEB_SYNC=0',
-  'TMUXWEB_SEARCH=0',
-  'TMUXWEB_SEARCH_MATCHED=0',
-  'if [ "$TMUXWEB_TMUX" -eq 1 ]; then',
-  'TMUXWEB_SESSION="$(tmux list-sessions -F \'#{session_id}\' 2>/dev/null | wc -l | tr -d \' \\n\\r\')"',
-  'if [ -z "${TMUXWEB_SESSION:-}" ]; then TMUXWEB_SESSION=-1; fi',
-  'TMUXWEB_WINDOW="$(tmux list-windows -a -F \'#{window_id}\' 2>/dev/null | wc -l | tr -d \' \\n\\r\')"',
-  'if [ -z "${TMUXWEB_WINDOW:-}" ]; then TMUXWEB_WINDOW=-1; fi',
-  'TMUXWEB_PANE="$(tmux list-panes -a -F \'#{pane_id}\' 2>/dev/null | wc -l | tr -d \' \\n\\r\')"',
-  'if [ -z "${TMUXWEB_PANE:-}" ]; then TMUXWEB_PANE=-1; fi',
-  'TMUXWEB_MODE="$(tmux display-message -p \'#{?pane_in_mode,1,0}\' 2>/dev/null | tr -d \' \\n\\r\')"',
-  'if [ -z "${TMUXWEB_MODE:-}" ]; then TMUXWEB_MODE=0; fi',
-  'TMUXWEB_SESSION_NAME="$(tmux display-message -p \'#S\' 2>/dev/null | tr -d \'\\n\\r\\t\')"',
-  'if [ -z "${TMUXWEB_SESSION_NAME:-}" ]; then TMUXWEB_SESSION_NAME="$(tmux list-sessions -F \'#{session_name}\' 2>/dev/null | head -n 1 | tr -d \'\\n\\r\\t\')"; fi',
-  'TMUXWEB_WINDOW_NAME="$(tmux display-message -p \'#W\' 2>/dev/null | tr -d \'\\n\\r\\t\')"',
-  'if [ -z "${TMUXWEB_WINDOW_NAME:-}" ] && [ -n "${TMUXWEB_SESSION_NAME:-}" ]; then TMUXWEB_WINDOW_NAME="$(tmux display-message -p -t "${TMUXWEB_SESSION_NAME}" \'#{window_name}\' 2>/dev/null | tr -d \'\\n\\r\\t\')"; fi',
-  'TMUXWEB_ACTIVE_WINDOW="$(tmux display-message -p \'#{window_index}\' 2>/dev/null | tr -d \' \\n\\r\')"',
-  'if [ -z "${TMUXWEB_ACTIVE_WINDOW:-}" ]; then TMUXWEB_ACTIVE_WINDOW=-1; fi',
-  'TMUXWEB_LAYOUT="$(tmux display-message -p \'#{window_layout}\' 2>/dev/null | tr -d \'\\n\\r\\t\')"',
-  'TMUXWEB_ZOOMED="$(tmux display-message -p \'#{window_zoomed_flag}\' 2>/dev/null | tr -d \' \\n\\r\')"',
-  'if [ -z "${TMUXWEB_ZOOMED:-}" ]; then TMUXWEB_ZOOMED=0; fi',
-  'TMUXWEB_SYNC_RAW="$(tmux show-window-options -v synchronize-panes 2>/dev/null | tr -d \'\\n\\r\')"',
-  'if [ "${TMUXWEB_SYNC_RAW:-off}" = "on" ]; then TMUXWEB_SYNC=1; else TMUXWEB_SYNC=0; fi',
-  'TMUXWEB_SEARCH_COUNT="$(tmux display-message -p \'#{search_count}\' 2>/dev/null | tr -d \' \\n\\r\')"',
-  'TMUXWEB_SEARCH_PRESENT="$(tmux display-message -p \'#{search_present}\' 2>/dev/null | tr -d \' \\n\\r\')"',
-  'if [ -n "${TMUXWEB_SEARCH_COUNT:-}" ] && [ "${TMUXWEB_SEARCH_COUNT}" -ge 1 ] 2>/dev/null; then TMUXWEB_SEARCH=1; if [ "${TMUXWEB_SEARCH_PRESENT:-0}" = "1" ]; then TMUXWEB_SEARCH_MATCHED=1; fi; fi',
-  'fi',
-  `printf "[[${PROBE_STATE_MARKER}:%s\\t%s\\t%s\\t%s\\t%s\\t%s\\t%s\\t%s\\t%s\\t%s\\t%s\\t%s\\t%s]]\\n" "$TMUXWEB_TMUX" "$TMUXWEB_SESSION" "$TMUXWEB_WINDOW" "$TMUXWEB_PANE" "$TMUXWEB_MODE" "$TMUXWEB_SESSION_NAME" "$TMUXWEB_WINDOW_NAME" "$TMUXWEB_ACTIVE_WINDOW" "$TMUXWEB_LAYOUT" "$TMUXWEB_ZOOMED" "$TMUXWEB_SYNC" "$TMUXWEB_SEARCH" "$TMUXWEB_SEARCH_MATCHED" >/dev/ttyS1`,
-];
-
-export const BASE_PROBE_TRIGGER_COMMAND = PROBE_STATE_TRIGGER_LINES.join('\n');
+// Keep probe dispatch short and deterministic over the ttyS2 relay.
+// Runtime probe shape is defined by /usr/bin/tmux-tuto-probe inside VM assets.
+export const BASE_PROBE_TRIGGER_COMMAND = '/usr/bin/tmux-tuto-probe >/dev/ttyS1 2>/dev/null';
 
 export const SEARCH_PROBE_TRIGGER_COMMAND = BASE_PROBE_TRIGGER_COMMAND;
 

src/pages/Practice/hooks/usePracticeVmBootstrap.ts

@@ -61,4 +61,13 @@ describe('vmTerminalStream', () => {
     expect(d.completedLine).toBe('xy');
     expect(d.nextLineBuffer).toBe('');
   });
+
+  it('preserves tab delimiters from probe output snapshots', () => {
+    const a = consumeProbeOutputByte('1'.charCodeAt(0), '');
+    const b = consumeProbeOutputByte('\t'.charCodeAt(0), a.nextLineBuffer);
+    const c = consumeProbeOutputByte('2'.charCodeAt(0), b.nextLineBuffer);
+    const d = consumeProbeOutputByte('\n'.charCodeAt(0), c.nextLineBuffer);
+
+    expect(d.completedLine).toBe('1\t2');
+  });
 });

src/pages/Practice/probeCommands.test.ts

@@ -8,6 +8,10 @@ export type TerminalOutputCaptureState = {
   inEscapeSequence: boolean;
 };
 
+function isPrintableOrTab(char: string) {
+  return char >= ' ' || char === '\t';
+}
+
 export function createInitialTerminalInputCaptureState(): TerminalInputCaptureState {
   return {
     lineBuffer: '',
@@ -132,7 +136,7 @@ export function consumeTerminalOutputByte(value: number, state: TerminalOutputCa
     };
   }
 
-  if (char >= ' ') {
+  if (isPrintableOrTab(char)) {
     lineBuffer += char;
   }
 
@@ -161,7 +165,7 @@ export function consumeProbeOutputByte(value: number, lineBuffer: string) {
     };
   }
 
-  if (char >= ' ') {
+  if (isPrintableOrTab(char)) {
     return {
       nextLineBuffer: `${lineBuffer}${char}`,
       completedLine: null as string | null,