fix(plugin): safe recording start — no mid-game config rewrite, scoped log clear

plugins/decky-vault/src/index.tsx

@@ -12,7 +12,8 @@ import { useSettings, useSession, useGameDetection } from "./lib/store"
 import {
   readAndParseMangohudLog,
   clearMangohudLog,
-  writeMangohudConfig,
+  deleteLogFile,
+  findMangohudLog,
   startMangohudLogging,
   stopMangohudLogging,
   getHardwareInfo,
@@ -37,6 +38,7 @@ function Content() {
     onGameStart,
     onGameStop,
     setGameName,
+    setLastLogPath,
   } = useSession()
 
   // ── Game detection via polling ────────────────────────────────
@@ -44,10 +46,13 @@ function Content() {
 
   // ── Handle start recording ────────────────────────────────────
   async function handleStart() {
-    // Write MangoHud config with logging settings
-    await writeMangohudConfig()
-    // Clear any previous log file
-    await clearMangohudLog()
+    // Clear the previous session's specific log if we know it; else safe-clear.
+    const prev = session.lastLogPath
+    if (prev) {
+      await deleteLogFile(prev)
+    } else {
+      await clearMangohudLog()
+    }
     // Fire-and-forget: try to start MangoHud logging (retries until game launches)
     startMangohudLogging()
     startRecording()
@@ -60,12 +65,14 @@ function Content() {
       await stopMangohudLogging()
       stopRecording()
 
-      // Parse the MangoHud log
-      const logResult = await readAndParseMangohudLog()
+      // Find the most recent MangoHud log, parse it, remember its path
+      const logPath = await findMangohudLog()
+      const logResult = await readAndParseMangohudLog(logPath.path ?? undefined)
       if (logResult.error) {
         setError(logResult.error)
         return
       }
+      setLastLogPath(logPath.path ?? null)
 
       // Read system info in parallel
       const [hwInfo, osVersion] = await Promise.all([

plugins/decky-vault/src/lib/api.ts

@@ -36,9 +36,21 @@ export const readAndParseMangohudLog = callable<[logPath?: string], {
 
 export const clearMangohudLog = callable<[], {
   success: boolean
+  deleted?: Array<{ name: string }>
+  skipped?: Array<{ name: string; reason: string }>
   error?: string
 }>("clear_mangohud_log")
 
+export const deleteLogFile = callable<[path: string], {
+  success: boolean
+  deleted?: boolean
+  error?: string
+}>("delete_log_file")
+
+export const findMangohudLog = callable<[], {
+  path: string | null
+}>("find_mangohud_log")
+
 export const startMangohudLogging = callable<[], {
   success: boolean
   error?: string

plugins/decky-vault/src/lib/store.ts

@@ -36,6 +36,8 @@ export interface SessionData {
   protonVersion: string
   versionString: string
   buildId: string
+  // Path of the MangoHud log captured for this session (for targeted cleanup on restart)
+  lastLogPath: string | null
   // Manual inputs (filled by user in the form)
   upscalerType: string
   upscalerVersion: string
@@ -70,6 +72,7 @@ function createEmptySession(): SessionData {
     protonVersion: "",
     versionString: "",
     buildId: "",
+    lastLogPath: null,
     upscalerType: "none",
     upscalerVersion: "",
     frameGenMethod: "none",
@@ -182,6 +185,10 @@ export function useSession() {
     setSession((prev) => ({ ...prev, gameName: name, appId: appId ?? prev.appId }))
   }, [])
 
+  const setLastLogPath = useCallback((p: string | null) => {
+    setSession((prev) => ({ ...prev, lastLogPath: p }))
+  }, [])
+
   return {
     recordingState,
     session,
@@ -196,6 +203,7 @@ export function useSession() {
     onGameStart,
     onGameStop,
     setGameName,
+    setLastLogPath,
   }
 }