fix: disk image

progression_backend/workshop.py

@@ -95,6 +95,10 @@ class SteamCmdBatchResult:
     failed_ids: set[str]
     output_tail: str
 
+    @property
+    def has_io_failure(self) -> bool:
+        return "i/o operation failed" in self.output_tail.lower()
+
 
 class SteamCmdRunner:
     def __init__(
@@ -106,6 +110,16 @@ class SteamCmdRunner:
         self.executable = executable
         self.content_dir = content_dir
         self.timeout_seconds = timeout_seconds
+        self._io_recovery_attempted = False
+
+    @property
+    def install_root(self) -> Path:
+        try:
+            return self.content_dir.parents[3]
+        except IndexError as error:
+            raise ValueError(
+                f"Invalid SteamCMD Workshop content path: {self.content_dir}"
+            ) from error
 
     def executable_path(self) -> str | None:
         configured = Path(self.executable)
@@ -130,6 +144,39 @@ class SteamCmdRunner:
                 "Check the container volume ownership."
             ) from error
 
+    def recover_io_failure(self) -> list[Path]:
+        """Quarantine Steam's transient Workshop state without touching mods."""
+        if self._io_recovery_attempted:
+            return []
+        self._io_recovery_attempted = True
+        workshop_dir = self.content_dir.parent.parent
+        candidates = [
+            workshop_dir / f"appworkshop_{RIMWORLD_APP_ID}.acf",
+            workshop_dir / "downloads" / RIMWORLD_APP_ID,
+            workshop_dir / "temp" / RIMWORLD_APP_ID,
+        ]
+        existing = [candidate for candidate in candidates if candidate.exists()]
+        if not existing:
+            return []
+
+        timestamp = (
+            datetime.now(timezone.utc).strftime("%Y%m%dT%H%M%SZ")
+            + f"-{time.time_ns()}"
+        )
+        recovery_dir = workshop_dir / ".progression-recovery" / timestamp
+        recovery_dir.mkdir(parents=True, exist_ok=True)
+        moved: list[Path] = []
+        for candidate in existing:
+            label = (
+                candidate.name
+                if candidate.is_file()
+                else f"{candidate.parent.name}-{candidate.name}"
+            )
+            destination = recovery_dir / label
+            shutil.move(str(candidate), str(destination))
+            moved.append(destination)
+        return moved
+
     def run_batch(
         self,
         workshop_ids: list[str],
@@ -145,7 +192,13 @@ class SteamCmdRunner:
             raise ValueError(f"Invalid Workshop ids: {', '.join(invalid)}")
         self.ensure_workshop_writable()
 
-        command = [executable, "+login", "anonymous"]
+        command = [
+            executable,
+            "+force_install_dir",
+            str(self.install_root),
+            "+login",
+            "anonymous",
+        ]
         for workshop_id in workshop_ids:
             command.extend(
                 [