fix(platform): Improve WSL SSH remote compatibility (#3316)

* fix(platform): add WSL compatibility functions and path translation
fix(cookbook): enhance model scan script to support additional HuggingFace cache paths
fix(hardware): improve cache key generation for remote SSH context
test(tests): add tests for WSL detection and path translation functionality

* fix(cookbook): prefer prebuilt wheels for llama-cpp-python and normalize package aliases

* fix: enable StrictHostKeyChecking in nvidia probe
refactor: consolidate ssh & powershell command execution to utility functions in core module
refactor: consolidate nvidia path candidates in to single variables in core module
tests: add tests for new utility functions

* fix: correct wrong variable name

core/platform_compat.py

@@ -161,6 +161,29 @@ _WINDOWS_BASH_RELATIVE_PATHS = (
     ("usr", "bin", "bash.exe"),
 )
 
+# Paths to add to the remote SSH probe command to find tools like nvidia-smi that may not be on PATH.
+_SSH_PATH_MEMBERS = (
+    "/usr/bin",
+    "/usr/local/bin",
+    "/usr/local/cuda/bin",
+    "/usr/lib/wsl/lib"
+)
+# Fallback locations for nvidia-smi on WSL and other Linux distros where it may not be on PATH.
+NVIDIA_PATH_CANDIDATES = (
+    "/usr/bin/nvidia-smi",
+    "/usr/local/bin/nvidia-smi",
+    "/usr/local/cuda/bin/nvidia-smi",
+    "/usr/lib/wsl/lib/nvidia-smi",
+)
+
+
+def _ssh_path_override() -> str:
+    """Build the PATH export snippet used for remote SSH shell probes."""
+    return f"export PATH=\"$PATH:{':'.join(_SSH_PATH_MEMBERS)}\"; "
+
+
+SSH_PATH_OVERRIDE = _ssh_path_override()
+
 
 def _windows_bash_fallbacks() -> List[str]:
     roots: List[str] = []
@@ -268,3 +291,156 @@ def run_script_argv(script_path) -> List[str]:
         comspec = os.environ.get("ComSpec", "cmd.exe")
         return [comspec, "/c", str(script_path)]
     return ["sh", str(script_path)]
+
+
+def is_wsl() -> bool:
+    """True if running inside Windows Subsystem for Linux (WSL)."""
+    import sys
+    if sys.platform.startswith("linux") or os.name == "posix":
+        try:
+            with open("/proc/version", "r") as f:
+                if "microsoft" in f.read().lower():
+                    return True
+        except Exception:
+            pass
+    return False
+
+
+def translate_path(path_str: str) -> str:
+    """Translate a path (possibly a Windows path) to the current OS format.
+
+    Particularly handles Windows paths (e.g. C:\\foo or C:/foo) when running
+    under WSL, translating them to /mnt/c/foo.
+    Also handles standard path normalization to avoid string breakages.
+    """
+    if not path_str:
+        return path_str
+
+    if is_wsl():
+        path_str = path_str.replace("\\", "/")
+        import re
+        m = re.match(r"^([a-zA-Z]):(.*)", path_str)
+        if m:
+            drive = m.group(1).lower()
+            rest = m.group(2)
+            if not rest.startswith("/"):
+                rest = "/" + rest
+            return f"/mnt/{drive}{rest}"
+
+    try:
+        return str(Path(path_str).resolve())
+    except Exception:
+        return path_str
+
+
+def get_wsl_windows_user_profile() -> Optional[str]:
+    """Retrieve the Windows host User Profile path from inside WSL."""
+    if not is_wsl():
+        return None
+    try:
+        r = run_wsl_windows_powershell("Write-Output $env:USERPROFILE", timeout=5)
+        if r.returncode == 0 and r.stdout.strip():
+            return translate_path(r.stdout.strip())
+    except Exception:
+        pass
+
+    try:
+        users_dir = "/mnt/c/Users"
+        if os.path.isdir(users_dir):
+            for entry in os.listdir(users_dir):
+                if entry not in ("All Users", "Default", "Default User", "desktop.ini", "Public"):
+                    path = os.path.join(users_dir, entry)
+                    if os.path.isdir(path):
+                        return path
+    except Exception:
+        pass
+    return None
+
+
+def _ssh_exec_argv(
+    remote: str,
+    ssh_port: str | None,
+    *,
+    remote_cmd: str | None = None,
+    connect_timeout: int | None = None,
+    strict_host_key_checking: bool | None = None,
+) -> list[str]:
+    """Build a consistent ssh argv for remote command execution."""
+    argv = ["ssh"]
+    if connect_timeout is not None:
+        argv.extend(["-o", f"ConnectTimeout={int(connect_timeout)}"])
+    if strict_host_key_checking is not None:
+        argv.extend(
+            [
+                "-o",
+                "StrictHostKeyChecking=yes"
+                if strict_host_key_checking
+                else "StrictHostKeyChecking=no",
+            ]
+        )
+    if ssh_port and ssh_port != "22":
+        argv.extend(["-p", str(ssh_port)])
+    argv.append(remote)
+    if remote_cmd is not None:
+        argv.append(remote_cmd)
+    return argv
+
+
+def run_ssh_command(
+    remote: str,
+    ssh_port: str | None,
+    remote_cmd: str,
+    *,
+    timeout: float,
+    connect_timeout: int | None = None,
+    strict_host_key_checking: bool | None = None,
+    text: bool = True,
+) -> subprocess.CompletedProcess:
+    """Run an ssh command with centralized timeout and stderr/stdout capture."""
+    return subprocess.run(
+        _ssh_exec_argv(
+            remote,
+            ssh_port,
+            remote_cmd=remote_cmd,
+            connect_timeout=connect_timeout,
+            strict_host_key_checking=strict_host_key_checking,
+        ),
+        timeout=timeout,
+        capture_output=True,
+        text=text,
+    )
+
+
+def _windows_powershell_argv(
+    command: str,
+    *,
+    no_profile: bool = True,
+    non_interactive: bool = True,
+) -> List[str]:
+    argv: List[str] = ["powershell.exe"]
+    if no_profile:
+        argv.append("-NoProfile")
+    if non_interactive:
+        argv.append("-NonInteractive")
+    argv.extend(["-Command", command])
+    return argv
+
+
+def run_wsl_windows_powershell(
+    command: str,
+    *,
+    timeout: float = 5,
+) -> subprocess.CompletedProcess[str]:
+    """Run a PowerShell command on the Windows host from WSL.
+
+    Raises ``RuntimeError`` when called outside WSL.
+    """
+
+    if not is_wsl():
+        raise RuntimeError("run_wsl_windows_powershell is only supported in WSL")
+    return subprocess.run(
+        _windows_powershell_argv(command),
+        capture_output=True,
+        text=True,
+        timeout=timeout,
+    )