     1→import sys
     2→from unittest.mock import MagicMock
     3→
     4→import pytest
     5→from pydantic import ValidationError
     6→
     7→from mirage.backend.local.memory import MemoryBackend
     8→from mirage.commands.custom.registry import CommandRegistry, ExternalCommand
     9→from mirage.commands.remote.client import CommandClient
    10→from mirage.types import (CommandResult, MountMode, RemoteCommandOptions)
    11→from mirage.workspace import SyncPolicy, Workspace
    12→
    13→
    14→def test_external_command_fields():
    15→    cmd = ExternalCommand(name="linecount", exec="python lc.py {file}")
    16→    assert cmd.description == ""
    17→
    18→
    19→def test_external_command_immutable():
    20→    cmd = ExternalCommand(name="x", exec="echo {file}")
    21→    with pytest.raises(ValidationError):
    22→        cmd.name = "y"
    23→
    24→
    25→def test_builtin_ls():
    26→    ws = Workspace({"/tmp/": MemoryBackend()},
    27→                   mode=MountMode.WRITE,
    28→                   sync_policy=SyncPolicy.IMMEDIATE)
    29→    ws.write("/tmp/a.txt", b"hi")
    30→    reg = CommandRegistry()
    31→    result = reg.run(ws, "ls /tmp/", cwd="/")
    32→    assert "a.txt" in result
    33→
    34→
    35→def test_register_external():
    36→    reg = CommandRegistry()
    37→    reg.register(ExternalCommand(name="echo-test", exec="echo hello"))
    38→    assert "echo-test" in reg.list_commands()
    39→
    40→
    41→def test_run_external_no_placeholder(tmp_path):
    42→    reg = CommandRegistry()
    43→    reg.register(ExternalCommand(name="greet", exec="echo hello"))
    44→    ws = Workspace({"/tmp/": MemoryBackend()})
    45→    result = reg.run(ws, "greet", cwd="/")
    46→    assert "hello" in result
    47→
    48→
    49→def test_run_external_file_placeholder(tmp_path):
    50→    ws = Workspace({"/tmp/": MemoryBackend()}, mode=MountMode.WRITE)

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


     1→from unittest.mock import MagicMock
     2→
     3→from mirage.backend.local.memory import MemoryBackend
     4→from mirage.commands.custom.registry import CommandRegistry, ExternalCommand
     5→from mirage.commands.remote.client import CommandClient
     6→from mirage.types import CommandResult, MountMode
     7→from mirage.workspace import SyncPolicy, Workspace
     8→
     9→
    10→def _fake_run_transform(command, cwd="/", stdin=None, files=None):
    11→    assert files is not None
    12→    assert "/data/input.json" in files
    13→    input_data = files["/data/input.json"].data
    14→    processed = input_data.upper()
    15→    return CommandResult(
    16→        stdout="processed 1 file",
    17→        output_files={"/data/output.csv": processed},
    18→    )
    19→
    20→
    21→def test_full_round_trip_file_transfer():
    22→    mock_client = MagicMock(spec=CommandClient)
    23→    mock_client.run.side_effect = _fake_run_transform
    24→
    25→    ws = Workspace(
    26→        {"/data/": MemoryBackend()},
    27→        mode=MountMode.WRITE,
    28→        sync_policy=SyncPolicy.IMMEDIATE,
    29→    )
    30→
    31→    ws.write("/data/input.json", b'{"name": "test"}')
    32→
    33→    reg = CommandRegistry(client=mock_client)
    34→    reg.register(
    35→        ExternalCommand(
    36→            name="transform",
    37→            exec="transform {file} -o {out}",
    38→        ))
    39→
    40→    result = reg.run(ws,
    41→                     "transform /data/input.json /data/output.csv",
    42→                     cwd="/")
    43→    assert "processed" in result
    44→
    45→    output = ws.cat("/data/output.csv")
    46→    assert output == b'{"NAME": "TEST"}'
    47→
    48→
    49→def test_full_round_trip_pipe_mode():
    50→    mock_client = MagicMock(spec=CommandClient)

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


     1→import time
     2→import uuid
     3→from datetime import datetime, timezone
     4→
     5→from mirage.backend.loader import load_backend_class
     6→from mirage.cli.config import parse_mount_uri, split_mount_spec
     7→from mirage.commands import COMMANDS, _resolve
     8→from mirage.commands.builtin import nav
     9→from mirage.commands.custom.registry import CommandRegistry, ExternalCommand
    10→from mirage.fuse import FUSE_OPS
    11→from mirage.fuse.loader import build_registry_from_config, load_fuse_op_class
    12→from mirage.observe.entries import (CommandEntry, CommandResult, DispatchInfo,
    13→                                    ParsedCommand, SessionEntry, WorkspaceInfo)
    14→from mirage.observe.session_log import get_or_create_log
    15→from mirage.runtime.base import _BLOCKED, CommandNotAllowedError
    16→from mirage.server.service.base import MirageService
    17→from mirage.server.service.cache import FileCache
    18→from mirage.server.service.session import WorkspaceSession, _unmount_fuse
    19→from mirage.types import (FileStat, MountMode, RuntimeType)
    20→from mirage.workspace import Workspace
    21→from mirage.workspace.sync import SyncPolicy
    22→from mirage.workspace.consistency import ConsistencyPolicy
    23→
    24→
    25→class LocalService(MirageService):
    26→
    27→    def __init__(self) -> None:
    28→        self._sessions: dict[str, WorkspaceSession] = {}
    29→        self._file_cache = FileCache()
    30→
    31→    def _get_session(self, ws_id: str) -> WorkspaceSession:
    32→        session = self._sessions.get(ws_id)
    33→        if session is None:
    34→            raise KeyError(f"workspace {ws_id!r} not found")
    35→        if session.fuse_mounted:
    36→            raise ValueError("not supported for fuse workspaces")
    37→        return session
    38→
    39→    def create_workspace(self, config: dict) -> str:
    40→        mode = config.get("mode", "write")
    41→        consistency = config.get("consistency", "cached")
    42→        default_mode = MountMode(mode)
    43→        default_consistency = ConsistencyPolicy(consistency)
    44→        mounts = config.get("mounts", {})
    45→
    46→        backends: dict = {}
    47→        for prefix, value in mounts.items():
    48→            if isinstance(value, str):
    49→                backends[prefix] = parse_mount_uri(value)
    50→            else:

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


     1→import pytest
     2→from pydantic import ValidationError
     3→
     4→from mirage.server.service.session import CommandStats
     5→from mirage.types import (BackendType, CommandResult, FilePayload, FileStat,
     6→                          Inode, RemoteCommandOptions, SyncResult,
     7→                          TransferStats)
     8→
     9→
    10→def test_filestat_defaults():
    11→    fs = FileStat(name="foo.txt")
    12→    assert fs.name == "foo.txt"
    13→    assert fs.size is None
    14→    assert fs.extra == {}
    15→
    16→
    17→def test_filestat_immutable():
    18→    fs = FileStat(name="foo.txt")
    19→    with pytest.raises(ValidationError):
    20→        fs.name = "bar.txt"
    21→
    22→
    23→def test_inode_defaults():
    24→    inode = Inode(virtual_path="/a/b.txt", backend_mount="/a/")
    25→    assert inode.dirty is False
    26→    assert inode.checksum is None
    27→
    28→
    29→def test_inode_mutable():
    30→    inode = Inode(virtual_path="/a/b.txt", backend_mount="/a/")
    31→    inode.dirty = True
    32→    assert inode.dirty is True
    33→
    34→
    35→def test_syncresult_fields():
    36→    r = SyncResult(path="/a/b.txt", op="create", status="ok")
    37→    assert r.op == "create"
    38→    assert r.duration_ms == 0
    39→
    40→
    41→def test_syncresult_immutable():
    42→    r = SyncResult(path="/a/b.txt", op="create", status="ok")
    43→    with pytest.raises(ValidationError):
    44→        r.status = "error"
    45→
    46→
    47→def test_transferstats_mutable():
    48→    ts = TransferStats()
    49→    ts.bytes_read += 100
    50→    assert ts.bytes_read == 100
    51→
    52→
    53→def test_commandstats_defaults():
    54→    cs = CommandStats()
    55→    assert cs.total_commands == 0
    56→    assert cs.command_counts == {}
    57→
    58→
    59→def test_command_result_defaults():
    60→    r = CommandResult(stdout="hello")
    61→    assert r.stdout == "hello"
    62→    assert r.output_files == {}
    63→
    64→
    65→def test_command_result_with_files():
    66→    r = CommandResult(stdout="done", output_files={"/out.csv": b"a,b"})
    67→    assert r.output_files["/out.csv"] == b"a,b"
    68→
    69→
    70→def test_file_payload_with_data():
    71→    p = FilePayload(checksum="abc123", data=b"hello")
    72→    assert p.checksum == "abc123"
    73→    assert p.data == b"hello"
    74→
    75→
    76→def test_file_payload_checksum_only():
    77→    p = FilePayload(checksum="abc123")
    78→    assert p.data is None
    79→
    80→
    81→def test_remote_command_options_defaults():
    82→    opts = RemoteCommandOptions()
    83→    assert opts.max_file_size == "100MB"
    84→    assert opts.cache == "enabled"
    85→
    86→
    87→def test_remote_command_options_custom():
    88→    opts = RemoteCommandOptions(max_file_size="500MB", cache="disabled")
    89→    assert opts.max_file_size == "500MB"
    90→    assert opts.cache == "disabled"
    91→
    92→
    93→def test_remote_command_options_only_two_fields():
    94→    opts = RemoteCommandOptions()
    95→    assert opts.max_file_size == "100MB"
    96→    assert opts.cache == "enabled"
    97→    assert set(RemoteCommandOptions.model_fields.keys()) == {
    98→        "max_file_size", "cache"
    99→    }
   100→
   101→
   102→def test_backend_type_values():
   103→    assert BackendType.MEMORY == "memory"
   104→    assert BackendType.LOCAL == "local"
   105→    assert BackendType.S3 == "s3"
   106→    assert BackendType.R2 == "r2"
   107→    assert BackendType.HTTP == "http"
   108→    assert BackendType.HTTPS == "https"
   109→
   110→
   111→def test_backend_type_string_equality():
   112→    assert BackendType.MEMORY.value == "memory"
   113→    assert BackendType.LOCAL.value == "local"
   114→    assert BackendType.S3.value == "s3"
   115→    assert BackendType.R2.value == "r2"
   116→    assert BackendType.HTTP.value == "http"
   117→    assert BackendType.HTTPS.value == "https"
   118→    assert BackendType("memory") is BackendType.MEMORY
   119→    assert BackendType("s3") is BackendType.S3
   120→
   121→
   122→def test_backend_type_members():
   123→    assert set(BackendType) == {
   124→        BackendType.MEMORY,
   125→        BackendType.LOCAL,
   126→        BackendType.S3,
   127→        BackendType.R2,
   128→        BackendType.HTTP,
   129→        BackendType.HTTPS,
   130→    }
   131→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


     1→import uuid
     2→
     3→from pydantic import BaseModel, Field
     4→
     5→from mirage.types import RuntimeType
     6→
     7→
     8→class WorkspaceInfo(BaseModel):
     9→    mounts: dict[str, dict] = Field(default_factory=dict)
    10→    cache_limit: str = ""
    11→    runtime_type: RuntimeType | None = None
    12→
    13→
    14→class SessionEntry(BaseModel):
    15→    type: str = "session"
    16→    version: int = 1
    17→    id: str = Field(default_factory=lambda: uuid.uuid4().hex)
    18→    timestamp: str = ""
    19→    workspace: WorkspaceInfo | None = None
    20→    commands: list[str] = Field(default_factory=list)

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


     1→from mirage.commands.builtin.handlers import COMMAND_COST, COMMANDS, _resolve
     2→
     3→__all__ = ["COMMANDS", "COMMAND_COST", "_resolve"]
     4→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


1:from __future__ import annotations
3:import time
5:from mirage.backend.base import BaseBackend
6:from mirage.backend.filetype import guess_type
7:from mirage.types import (FileStat, Inode, MountMode, SyncResult, TransferStats)
8:from mirage.workspace.cache import LRUCache
9:from mirage.workspace.consistency import ConsistencyPolicy, is_fresh
10:from mirage.workspace.mount import MountRegistry
11:from mirage.workspace.sync import DirtyTracker, SyncPolicy

[Showing results with pagination = limit: 20, offset: 0]


1:import hashlib
2:import time
3:from enum import Enum
5:from mirage.backend.base import BaseBackend
6:from mirage.types import Inode, SyncResult

[Showing results with pagination = limit: 10, offset: 0]


1:import os
3:import yaml
5:from mirage.backend.base import BaseBackend
6:from mirage.backend.local.local import LocalBackend
7:from mirage.backend.local.memory import MemoryBackend
8:from mirage.types import BackendType, MountMode
9:from mirage.workspace.consistency import ConsistencyPolicy

[Showing results with pagination = limit: 10, offset: 0]


1:import os
2:import resource
3:import time
4:from typing import TYPE_CHECKING, Any
6:from mirage.backend.local.memory import MemoryBackend
7:from mirage.commands import COMMAND_COST, COMMANDS
8:from mirage.types import CostLevel

[Showing results with pagination = limit: 10, offset: 0]


1:from mirage.backend.local.memory import MemoryBackend
2:from mirage.commands import COMMAND_COST, COMMANDS
3:from mirage.types import CostLevel
4:from mirage.workspace import Workspace

[Showing results with pagination = limit: 10, offset: 0]


1:import posixpath
2:from typing import Callable
4:from mirage.types import CostLevel
5:from mirage.workspace import Workspace
7:from . import nav, net, read, search, write

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1:import base64
2:import inspect
3:import json
4:from unittest.mock import MagicMock, patch
6:import httpx
7:import pytest
9:from mirage.commands.remote.client import (CommandClient, CommandClientError,
12:from mirage.types import CommandResult, FilePayload

[Showing results with pagination = limit: 15, offset: 0]


1:import hashlib
2:import shlex
3:from typing import TYPE_CHECKING
5:from pydantic import BaseModel, ConfigDict
7:from mirage.commands import COMMANDS
8:from mirage.commands.custom.arg_resolver import classify_args
9:from mirage.commands.custom.executor import run_backend_method, run_external
10:from mirage.server.constants import _parse_size
11:from mirage.types import FilePayload, RemoteCommandOptions
12:from mirage.workspace import Workspace

[Showing results with pagination = limit: 15, offset: 0]


1:import base64
2:from abc import ABC, abstractmethod
4:import grpc
5:import httpx
7:from mirage.commands.remote.auth import ClientAuth, NoAuth
8:from mirage.commands.remote.grpc.proto import command_pb2, command_pb2_grpc
9:from mirage.types import CommandResult, FilePayload

[Showing results with pagination = limit: 15, offset: 0]


1:import sys
2:from unittest.mock import MagicMock
4:import pytest
5:from pydantic import ValidationError
7:from mirage.backend.local.memory import MemoryBackend
8:from mirage.commands.custom.registry import CommandRegistry, ExternalCommand
9:from mirage.commands.remote.client import CommandClient
10:from mirage.types import (CommandResult, MountMode, RemoteCommandOptions)
11:from mirage.workspace import SyncPolicy, Workspace

[Showing results with pagination = limit: 15, offset: 0]


1:from unittest.mock import MagicMock
3:from mirage.backend.local.memory import MemoryBackend
4:from mirage.commands.custom.registry import CommandRegistry, ExternalCommand
5:from mirage.commands.remote.client import CommandClient
6:from mirage.types import CommandResult, MountMode
7:from mirage.workspace import SyncPolicy, Workspace

[Showing results with pagination = limit: 15, offset: 0]


1:import time
2:import uuid
3:from datetime import datetime, timezone
5:from mirage.backend.loader import load_backend_class
6:from mirage.cli.config import parse_mount_uri, split_mount_spec
7:from mirage.commands import COMMANDS, _resolve
8:from mirage.commands.builtin import nav
9:from mirage.commands.custom.registry import CommandRegistry, ExternalCommand
10:from mirage.fuse import FUSE_OPS
11:from mirage.fuse.loader import build_registry_from_config, load_fuse_op_class
12:from mirage.observe.entries import (CommandEntry, CommandResult, DispatchInfo,
14:from mirage.observe.session_log import get_or_create_log
15:from mirage.runtime.base import _BLOCKED, CommandNotAllowedError
16:from mirage.server.service.base import MirageService
17:from mirage.server.service.cache import FileCache
18:from mirage.server.service.session import WorkspaceSession, _unmount_fuse
19:from mirage.types import (FileStat, MountMode, RuntimeType)
20:from mirage.workspace import Workspace
21:from mirage.workspace.sync import SyncPolicy
22:from mirage.workspace.consistency import ConsistencyPolicy

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<ide_selection>The user selected the lines 10 to 34 from /Users/agent/strukto/mirage/mirage/workspace/sync.py:
class SyncPolicy(str, Enum):
    STAGED = "staged"
    IMMEDIATE = "immediate"
    MANUAL = "manual"

class Inode(BaseModel):
    virtual_path: str
    backend_mount: str
    checksum: str | None = None
    size: int | None = None
    remote_checksum: str | None = None
    dirty: bool = False

class SyncResult(BaseModel):
    model_config = ConfigDict(frozen=True)

    path: str
    op: str
    status: str
    remote: str | None = None
    bytes: int | None = None
    duration_ms: int = 0
    error: str | None = None

This may or may not be related to the current task.</ide_selection>

Why not have config and types for

class SyncPolicy(str, Enum):
    STAGED = "staged"
    IMMEDIATE = "immediate"
    MANUAL = "manual"

class Inode(BaseModel):
    virtual_path: str
    backend_mount: str
    checksum: str | None = None
    size: int | None = None
    remote_checksum: str | None = None
    dirty: bool = False

class SyncResult(BaseModel):
    model_config = ConfigDict(frozen=True)

    path: str
    op: str
    status: str
    remote: str | None = None
    bytes: int | None = None
    duration_ms: int = 0
    error: str | None = None


The user is asking why not separate `SyncPolicy`, `Inode`, and `SyncResult` into their own file (like `workspace/types.py`) rather than having them in `workspace/sync.py` alongside the `DirtyTracker` logic.

This is a valid point. `sync.py` currently has two concerns:
1. The types/models: `SyncPolicy`, `Inode`, `SyncResult`
2. The engine: `DirtyTracker`, `_md5`

Separating them would mean:
- `workspace/types.py` — `SyncPolicy`, `Inode`, `SyncResult`, `TransferStats` (also move TransferStats here from workspace.py)

- `workspace/sync.py` — `DirtyTracker`, `_md5` (imports types from workspace/types.py)

This follows the same pattern we've been using everywhere else. I'll go ahead and make this change — it's straightforward: create the new types file, move the classes over, and update the imports in sync.py.

But I should also move `TransferStats` from `workspace/workspace.py` into types.py since it's a data structure, not logic. That way all the workspace data types live in one place. So the split becomes: types.py holds `SyncPolicy`, `Inode`, `SyncResult`, and `TransferStats`; sync.py has the engine logic; and workspace.py contains the main `Workspace` class and `_Path`. I'll need to update the re-exports in `__init__.py` and fix any import sites like test_types.py that currently pull from sync.py.


Good call. `sync.py` currently mixes types (`SyncPolicy`, `Inode`, `SyncResult`) with the engine (`DirtyTracker`). Splitting them follows the same pattern we've applied everywhere else. I'll also move `TransferStats` from `workspace.py` into the new file.


TodoWrite

Create workspace/types.py with SyncPolicy, Inode, SyncResult, TransferStats

Update sync.py to import from workspace/types.py

Update workspace.py to import from workspace/types.py

Update all other import sites

Verify tests pass


Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable

Create workspace/types.py with SyncPolicy, Inode, SyncResult, TransferStats

Update sync.py to import from workspace/types.py

Update workspace.py to import from workspace/types.py

Update all other import sites

Verify tests pass


Write

from enum import Enum

from pydantic import BaseModel, ConfigDict

class SyncPolicy(str, Enum):
    STAGED = "staged"
    IMMEDIATE = "immediate"
    MANUAL = "manual"

class Inode(BaseModel):
    virtual_path: str
    backend_mount: str
    checksum: str | None = None
    size: int | None = None
    remote_checksum: str | None = None
    dirty: bool = False

class SyncResult(BaseModel):
    model_config = ConfigDict(frozen=True)

    path: str
    op: str
    status: str
    remote: str | None = None
    bytes: int | None = None
    duration_ms: int = 0
    error: str | None = None

class TransferStats(BaseModel):
    bytes_read: int = 0
    bytes_written: int = 0
    read_ops: int = 0
    write_ops: int = 0
    cache_hits: int = 0
    cache_misses: int = 0
    total_read_ms: int = 0
    total_write_ms: int = 0


File created successfully at: /Users/agent/strukto/mirage/mirage/workspace/types.py

from enum import Enum

from pydantic import BaseModel, ConfigDict

class SyncPolicy(str, Enum):
    STAGED = "staged"
    IMMEDIATE = "immediate"
    MANUAL = "manual"

class Inode(BaseModel):
    virtual_path: str
    backend_mount: str
    checksum: str | None = None
    size: int | None = None
    remote_checksum: str | None = None
    dirty: bool = False

class SyncResult(BaseModel):
    model_config = ConfigDict(frozen=True)

    path: str
    op: str
    status: str
    remote: str | None = None
    bytes: int | None = None
    duration_ms: int = 0
    error: str | None = None

class TransferStats(BaseModel):
    bytes_read: int = 0
    bytes_written: int = 0
    read_ops: int = 0
    write_ops: int = 0
    cache_hits: int = 0
    cache_misses: int = 0
    total_read_ms: int = 0
    total_write_ms: int = 0


Conversation compacted


This session is being continued from a previous conversation that ran out of context. The summary below covers the earlier portion of the conversation.

Analysis:
Let me chronologically analyze this conversation to create a comprehensive summary.

**Session Start**: This is a continuation from a previous session. The conversation begins with system reminders showing that several files were already read (local.py, test_app.py, workspace.py, cache/policy.py, mount.py) and a plan file existed at `/Users/agent/.claude/plans/shimmering-leaping-wozniak.md` with an OLD plan for workspace refactoring.

**Initial task**: The user had approved a plan to refactor `server/service/local.py` by extracting `WorkspaceSession` and `_unmount_fuse` to a new `session.py` file. The plan was already written, so the assistant exited plan mode and implemented it.

**Task 1: Extract session model from local.py**
- Created `mirage/server/service/session.py` with `WorkspaceSession` and `_unmount_fuse`
- Updated `local.py` to import from `session.py`
- Errors: `CommandRegistry` was accidentally removed from imports (still needed in `create_workspace()`), and `time` was accidentally removed (still needed for `t0 = time.monotonic()` in `exec()`). Fixed both.
- 656 tests passed.

**Task 2: "for all the time change to utc?"**
The user asked to change `time.monotonic()` to UTC time for timestamp fields (not duration measurement pairs). Changed:
- `workspace/cache/store.py`: `cached_at=time.monotonic()` → `cached_at=time.time()`
- `workspace/consistency.py`: `time.monotonic() - entry.cached_at` → `time.time() - entry.cached_at`
- `workspace/workspace.py`: `self._created_at: float = time.monotonic()` → `time.time()`
- `server/service/session.py`: `default_factory=time.monotonic` → `default_factory=time.time`
- Duration pairs (`t0 = time.monotonic()`) were kept as monotonic (correct for measuring elapsed time)

**Task 3: "what's the dependency now?"**
The assistant provided a dependency layering diagram showing the current module structure after all refactoring.

**Task 4: "So any suggestions?"**
The assistant suggested 5 improvements:
1. Remove `Workspace._created_at` (dead field)
2. Move `SyncPolicy` from `types.py` to `workspace/sync.py`
3. Move `CommandStats` from `types.py` to `server/service/session.py`
4. `local.py` still imports `ConsistencyPolicy` from `workspace.consistency` directly
5. Lazy-load FUSE backends in `fuse/__init__.py`

User said "Yea let's have a plan and start" - entered plan mode.

**Task 5: Plan for moving SyncPolicy and CommandStats**
The assistant entered plan mode, explored the codebase (SyncPolicy used in 18 files, CommandStats in 3 files), and wrote a plan to:
1. Move `SyncPolicy` → `workspace/sync.py`, re-export from `workspace/__init__.py`
2. Move `CommandStats` → `server/service/session.py`
3. Remove dead `Workspace._created_at`

Implemented all three tasks:
- SyncPolicy moved to workspace/sync.py, re-exported from workspace/__init__.py and mirage/__init__.py
- Updated 18 import sites (using Python script for bulk test file updates)
- CommandStats moved to session.py
- _created_at removed from Workspace
- 656 tests passed

**Task 6: "Ok now is there anything else we can make the package more modular?"**
The assistant analyzed remaining types in `types.py` and identified:
- Tier 1: `Inode`, `SyncResult` → `workspace/sync.py`; `TransferStats` → `workspace/workspace.py`
- Tier 2: `FilePayload`, `RemoteCommandOptions`, `CommandResult` → `commands/types.py`
- Tier 3: `BackendType` → `cli/config.py`; `CostLevel` → `commands/`
- Naming collision: `observe/entries.py` also has a `CommandResult` (different: exit_code, stdout_bytes, duration_ms)

**Task 7: "Start"** - User approved implementing all tiers.
Implemented:
- Created `commands/types.py` with `CostLevel`, `FilePayload`, `RemoteCommandOptions`, `CommandResult`
- Moved `Inode` + `SyncResult` → `workspace/sync.py` (removed from types import)
- Moved `TransferStats` → `workspace/workspace.py`
- Moved `BackendType` → `cli/config.py`
- Updated `workspace/__init__.py` to re-export `Inode`, `SyncResult`
- Updated `mirage/__init__.py`
- Updated all internal module imports
- Updated all test file imports (bulk Python script for test files)
- Rewrote `types.py` to only contain: `FileType`, `FileStat`, `MountMode`, `RuntimeType`
- 656 tests passed

**Task 8: Current work - "Why not have config and types for [SyncPolicy, Inode, SyncResult]"**
The user pointed out that `sync.py` mixes types (`SyncPolicy`, `Inode`, `SyncResult`) with engine logic (`DirtyTracker`). Suggested creating `workspace/types.py`.

The assistant started implementing:
- Created `workspace/types.py` with `SyncPolicy`, `Inode`, `SyncResult`, `TransferStats`
- Started a TodoWrite with 5 tasks
- The work was interrupted by the summary request after the file was created

The next steps needed:
1. Update `sync.py` to import from `workspace/types.py` (remove class definitions)
2. Update `workspace.py` to import from `workspace/types.py` (remove `TransferStats` definition)
3. Update `workspace/__init__.py` re-exports
4. Update all import sites (`test_types.py` imports from `workspace.sync`)
5. Verify tests pass

Summary:
1. Primary Request and Intent:
   The session covers a series of modular refactoring tasks for the `mirage` Python package. The user's explicit requests in order:
   - Extract `WorkspaceSession` + `_unmount_fuse` from `server/service/local.py` to a new `session.py` (plan was pre-approved)
   - Change all timestamp `time.monotonic()` calls to UTC (`time.time()`) — not duration pairs
   - Show the current inter-module dependency graph
   - Suggestions for further modularity improvements
   - Plan and implement: move `SyncPolicy` to `workspace/sync.py`, move `CommandStats` to `session.py`, remove dead `Workspace._created_at`
   - More suggestions, then implement all remaining type moves from `types.py`
   - Most recently: "Why not have config and types for [SyncPolicy, Inode, SyncResult]" — split `workspace/sync.py` into `workspace/types.py` (data models) and `workspace/sync.py` (engine only)

2. Key Technical Concepts:
   - Python module separation by concern (data models vs engine logic)
   - `time.monotonic()` for duration measurement vs `time.time()` (UTC) for wall-clock timestamps
   - Pydantic `BaseModel`, `ConfigDict`, `Field` for data models
   - Python mock patching: patch where used, not where defined (e.g., `mirage.cli.commands.workspace.fuse_mount_fn` not `mirage.fuse.mount.mount`)
   - `pytest --import-mode=importlib` for duplicate test file names without `__init__.py`
   - Layered module architecture: `types` (leaf) → `workspace/` → `server/service/` → `server/fastapi/`
   - Re-exporting via `__init__.py` for clean public API
   - No backward compatibility required (per CLAUDE.md)

3. Files and Code Sections:

   - **`mirage/server/service/session.py`** (NEW — created this session)
     - Contains `CommandStats`, `WorkspaceSession`, `_unmount_fuse` extracted from `local.py`
     - Uses `time.time()` for `created_at` field
     ```python
     class CommandStats(BaseModel):
         total_commands: int = 0
         total_errors: int = 0
         last_command: str = ""
         last_timestamp: str = ""
         command_counts: dict[str, int] = Field(default_factory=dict)

     class WorkspaceSession(BaseModel):
         model_config = ConfigDict(arbitrary_types_allowed=True)
         id: str
         ws: Workspace | None
         registry: CommandRegistry | None
         cwd: str = "/"
         fuse_mounted: bool = False
         mode: MountMode = MountMode.WRITE
         mountpoint: str | None = None
         pid: int | None = None
         mounts: list[dict] = Field(default_factory=list)
         runtime_type: RuntimeType | None = None
         fuse_registry: FuseOpRegistry = Field(default_factory=FuseOpRegistry)
         command_stats: CommandStats = Field(default_factory=CommandStats)
         created_at: float = Field(default_factory=time.time)
         reported_status: dict | None = None
         reported_transfers: dict | None = None
     ```

   - **`mirage/server/service/local.py`** (modified)
     - Removed `WorkspaceSession`, `_unmount_fuse`, and their associated imports
     - Added `from mirage.server.service.session import WorkspaceSession, _unmount_fuse`
     - Kept `CommandRegistry`, `time` imports (still used in `create_workspace()` and `exec()`)
     - Current imports:
     ```python
     import time
     import uuid
     from datetime import datetime, timezone
     from mirage.backend.loader import load_backend_class
     from mirage.cli.config import parse_mount_uri, split_mount_spec
     from mirage.commands import COMMANDS, _resolve
     from mirage.commands.builtin import nav
     from mirage.commands.custom.registry import CommandRegistry, ExternalCommand
     from mirage.fuse import FUSE_OPS
     from mirage.fuse.loader import build_registry_from_config, load_fuse_op_class
     from mirage.observe.entries import (CommandEntry, CommandResult, DispatchInfo, ParsedCommand, SessionEntry, WorkspaceInfo)
     from mirage.observe.session_log import get_or_create_log
     from mirage.runtime.base import _BLOCKED, CommandNotAllowedError
     from mirage.server.service.base import MirageService
     from mirage.server.service.cache import FileCache
     from mirage.server.service.session import WorkspaceSession, _unmount_fuse
     from mirage.types import (FileStat, MountMode, RuntimeType)
     from mirage.workspace import Workspace
     from mirage.workspace.sync import SyncPolicy
     from mirage.workspace.consistency import ConsistencyPolicy
     ```

   - **`mirage/workspace/sync.py`** (modified significantly)
     - Added `SyncPolicy`, `Inode`, `SyncResult` class definitions (moved from `types.py`)
     - Removed `from mirage.types import Inode, SyncResult`
     - Added `from pydantic import BaseModel, ConfigDict`
     - Current structure: `SyncPolicy`, `Inode`, `SyncResult`, `DirtyTracker`, `_md5`
     ```python
     class SyncPolicy(str, Enum):
         STAGED = "staged"
         IMMEDIATE = "immediate"
         MANUAL = "manual"

     class Inode(BaseModel):
         virtual_path: str
         backend_mount: str
         checksum: str | None = None
         size: int | None = None
         remote_checksum: str | None = None
         dirty: bool = False

     class SyncResult(BaseModel):
         model_config = ConfigDict(frozen=True)
         path: str
         op: str
         status: str
         remote: str | None = None
         bytes: int | None = None
         duration_ms: int = 0
         error: str | None = None
     ```

   - **`mirage/workspace/types.py`** (NEW — created at end of session, incomplete)
     - Created to hold all workspace data types (`SyncPolicy`, `Inode`, `SyncResult`, `TransferStats`)
     - The plan is to have `sync.py` import from here instead of defining them
     ```python
     from enum import Enum
     from pydantic import BaseModel, ConfigDict

     class SyncPolicy(str, Enum):
         STAGED = "staged"
         IMMEDIATE = "immediate"
         MANUAL = "manual"

     class Inode(BaseModel):
         virtual_path: str
         backend_mount: str
         checksum: str | None = None
         size: int | None = None
         remote_checksum: str | None = None
         dirty: bool = False

     class SyncResult(BaseModel):
         model_config = ConfigDict(frozen=True)
         path: str
         op: str
         status: str
         remote: str | None = None
         bytes: int | None = None
         duration_ms: int = 0
         error: str | None = None

     class TransferStats(BaseModel):
         bytes_read: int = 0
         bytes_written: int = 0
         read_ops: int = 0
         write_ops: int = 0
         cache_hits: int = 0
         cache_misses: int = 0
         total_read_ms: int = 0
         total_write_ms: int = 0
     ```

   - **`mirage/workspace/workspace.py`** (modified)
     - Removed `Workspace._created_at` (dead field)
     - Added `TransferStats` class definition (temporarily, to be moved to `workspace/types.py`)
     - Updated imports to use `from mirage.workspace.sync import DirtyTracker, Inode, SyncPolicy, SyncResult`

   - **`mirage/workspace/__init__.py`** (modified)
     - Re-exports: `SyncPolicy`, `Inode`, `SyncResult` from `workspace.sync`, `Workspace` from `workspace.workspace`
     ```python
     from mirage.workspace.sync import Inode, SyncPolicy, SyncResult
     from mirage.workspace.workspace import Workspace
     __all__ = ["Workspace", "SyncPolicy", "Inode", "SyncResult"]
     ```

   - **`mirage/__init__.py`** (modified)
     - Imports `Inode`, `SyncPolicy`, `SyncResult` from `mirage.workspace` (not `types`)
     - Only imports `FileStat`, `MountMode` from `mirage.types`

   - **`mirage/types.py`** (heavily trimmed)
     - Now contains ONLY: `FileType`, `FileStat`, `MountMode`, `RuntimeType`
     - All other types moved to their owning modules

   - **`mirage/workspace/consistency.py`** (modified earlier)
     - `time.monotonic()` → `time.time()` in TTL check

   - **`mirage/workspace/cache/store.py`** (modified)
     - `cached_at=time.monotonic()` → `cached_at=time.time()`

   - **`mirage/commands/types.py`** (NEW)
     - Contains `CostLevel`, `FilePayload`, `RemoteCommandOptions`, `CommandResult`
     ```python
     class CostLevel(str, Enum):
         CHEAP = "cheap"
         PARTIAL = "partial"
         EXPENSIVE = "expensive"
         NETWORK = "network"

     class FilePayload(BaseModel):
         checksum: str
         data: bytes | None = None

     class RemoteCommandOptions(BaseModel):
         max_file_size: str = "100MB"
         cache: str = "enabled"

     class CommandResult(BaseModel):
         model_config = ConfigDict(arbitrary_types_allowed=True)
         stdout: str = ""
         output_files: dict[str, bytes] = {}
     ```

   - **`mirage/cli/config.py`** (modified)
     - `BackendType` enum defined here (moved from `types.py`)
     - Removed `from mirage.types import BackendType`

   - **`mirage/commands/builtin/handlers.py`** — updated to `from mirage.commands.types import CostLevel`
   - **`mirage/commands/custom/registry.py`** — updated to `from mirage.commands.types import FilePayload, RemoteCommandOptions`
   - **`mirage/commands/remote/client.py`** — updated to `from mirage.commands.types import CommandResult, FilePayload`
   - **`mirage/observe/inspector.py`** — updated to `from mirage.commands.types import CostLevel`
   - **`mirage/runtime/local.py`** — updated to `from mirage.workspace import SyncPolicy, Workspace`
   - **`mirage/runtime/remote.py`** — updated to `from mirage.workspace import SyncPolicy, Workspace`
   - **`mirage/server/fastapi/config.py`** — updated to `from mirage.workspace.sync import SyncPolicy`

4. Errors and fixes:
   - **`NameError: name 'CommandRegistry' is not defined`** in `local.py`:
     - When extracting session model, accidentally removed `CommandRegistry` from imports
     - Fix: re-added `from mirage.commands.custom.registry import CommandRegistry, ExternalCommand`
   - **`NameError: name 'time' is not defined`** in `local.py`:
     - When extracting session model, removed `time` import thinking it was only for `WorkspaceSession.created_at`
     - Fix: re-added `import time` (still used for `t0 = time.monotonic()` in `exec()`)
   - **Duplicate `SyncPolicy` class** in `workspace/sync.py`:
     - When adding `Inode`, `SyncResult` to sync.py, accidentally created a second `SyncPolicy` definition
     - Fix: removed the duplicate with `Edit` tool

5. Problem Solving:
   - Successfully refactored `types.py` from ~119 lines with 14 types to 34 lines with 4 types (`FileType`, `FileStat`, `MountMode`, `RuntimeType`)
   - Established clear module ownership: workspace types in `workspace/`, command protocol types in `commands/types.py`, session types in `server/service/session.py`, CLI-specific enums in `cli/config.py`
   - Note: `observe/entries.py` has its own `CommandResult` (logging metadata: exit_code, stdout_bytes, duration_ms) which is DISTINCT from `commands/types.CommandResult` (runtime response: stdout, output_files) — naming collision exists but not yet resolved
   - All 656 tests pass throughout

6. All user messages:
   - (Continuation from previous session — plan was pre-approved)
   - "also for all the time change to utc? / also what's the dependency now?"
   - "So any suggestions?"
   - "Yea let's have a plan and start"
   - "Start"
   - "Ok now is there anything else we can make the package more modular?"
   - "Start"
   - "Why not have config and types for [SyncPolicy, Inode, SyncResult classes shown in IDE selection]"

7. Pending Tasks:
   - Complete the `workspace/types.py` split:
     1. Update `workspace/sync.py` to import from `workspace/types.py` and remove class definitions
     2. Update `workspace/workspace.py` to import `TransferStats` from `workspace/types.py` and remove definition
     3. Update `workspace/__init__.py` re-exports to import from `workspace/types`
     4. Update all external import sites (e.g., `tests/test_types.py` currently imports `Inode`, `SyncResult` from `mirage.workspace.sync`, `TransferStats` from `mirage.workspace.workspace`)
     5. Verify 656 tests still pass

8. Current Work:
   The user pointed out that `workspace/sync.py` mixes types (`SyncPolicy`, `Inode`, `SyncResult`) with engine logic (`DirtyTracker`), asking "Why not have config and types for" these classes. The assistant created `mirage/workspace/types.py` with all four workspace data types (`SyncPolicy`, `Inode`, `SyncResult`, `TransferStats`), and created a TodoWrite tracking 5 tasks. The session was interrupted immediately after the file was created — `sync.py` and `workspace.py` have NOT been updated yet to import from the new file, and no import sites have been updated.

   The new file `mirage/workspace/types.py` was just created:
   ```python
   from enum import Enum
   from pydantic import BaseModel, ConfigDict

   class SyncPolicy(str, Enum): ...
   class Inode(BaseModel): ...
   class SyncResult(BaseModel): ...
   class TransferStats(BaseModel): ...
   ```

   Current TodoWrite state:
   1. ✅ Create workspace/types.py
   2. ⏳ Update sync.py to import from workspace/types.py
   3. ⏳ Update workspace.py to import from workspace/types.py
   4. ⏳ Update all other import sites
   5. ⏳ Verify tests pass

9. Optional Next Step:
   Continue the `workspace/types.py` split by updating `sync.py` to remove its inline class definitions and import from `workspace/types.py` instead. The user asked "Why not have config and types for [SyncPolicy, Inode, SyncResult]" and the assistant created `workspace/types.py` as the first step — the next step is making `sync.py` use it:

   Update `mirage/workspace/sync.py`: remove `SyncPolicy`, `Inode`, `SyncResult` class definitions and `from pydantic import BaseModel, ConfigDict`, add `from mirage.workspace.types import Inode, SyncPolicy, SyncResult`.

   Then update `workspace/workspace.py`: remove `TransferStats` definition and `from pydantic import BaseModel`, add `from mirage.workspace.types import Inode, SyncPolicy, SyncResult, TransferStats`.

   Then update all import sites that currently point to `workspace.sync` or `workspace.workspace` for these types.

If you need specific details from before compaction (like exact code snippets, error messages, or content you generated), read the full transcript at: /Users/agent/.claude/projects/-Users-agent-strukto-mirage/664396f7-55a4-4604-8289-aa7142480db4.jsonl
Please continue the conversation from where we left off without asking the user any further questions. Continue with the last task that you were asked to work on.


Let me continue from where we left off. The last task was creating `workspace/types.py` and now I need to:

1. ✅ Create workspace/types.py (done)
2. Update sync.py to import from workspace/types.py
3. Update workspace.py to import from workspace/types.py
4. Update all other import sites
5. Verify tests pass

Let me check the current state of the files first.


TodoWrite

Create workspace/types.py

Update sync.py to import from workspace/types.py

Updating sync.py to import from workspace/types.py

Update workspace.py to import from workspace/types.py

Updating workspace.py to import from workspace/types.py

Update all other import sites

Verify tests pass


Update all other import sites

Verify tests pass

Create workspace/types.py

Updating sync.py to import from workspace/types.py

Updating workspace.py to import from workspace/types.py

Update all other import sites

Verify tests pass


     1→import hashlib
     2→import time
     3→from enum import Enum
     4→
     5→from pydantic import BaseModel, ConfigDict
     6→
     7→from mirage.backend.base import BaseBackend
     8→
     9→
    10→class SyncPolicy(str, Enum):
    11→    STAGED = "staged"
    12→    IMMEDIATE = "immediate"
    13→    MANUAL = "manual"
    14→
    15→
    16→class Inode(BaseModel):
    17→    virtual_path: str
    18→    backend_mount: str
    19→    checksum: str | None = None
    20→    size: int | None = None
    21→    remote_checksum: str | None = None
    22→    dirty: bool = False
    23→
    24→
    25→class SyncResult(BaseModel):
    26→    model_config = ConfigDict(frozen=True)
    27→
    28→    path: str
    29→    op: str
    30→    status: str
    31→    remote: str | None = None
    32→    bytes: int | None = None
    33→    duration_ms: int = 0
    34→    error: str | None = None
    35→
    36→
    37→class DirtyTracker:
    38→    """
    39→    Tracks which virtual paths have local changes that haven't been synced
    40→    to their backing backend.
    41→
    42→    Lifecycle:
    43→        on_read()  — record baseline remote checksum (not dirty)
    44→        on_write() — update local checksum, mark dirty=True
    45→        on_sync()  — upload to backend, clear dirty flag
    46→    """
    47→
    48→    def __init__(self) -> None:
    49→        self._inodes: dict[str, Inode] = {}
    50→
    51→    # ── event hooks ─────────────────────────────────────────────────────────
    52→
    53→    def on_read(self, path: str, data: bytes, mount: str) -> None:
    54→        checksum = _md5(data)
    55→        if path in self._inodes:
    56→            inode = self._inodes[path]
    57→            inode.remote_checksum = checksum
    58→            inode.checksum = checksum
    59→            inode.size = len(data)
    60→            inode.dirty = False
    61→        else:
    62→            self._inodes[path] = Inode(
    63→                virtual_path=path,
    64→                backend_mount=mount,
    65→                checksum=checksum,
    66→                size=len(data),
    67→                remote_checksum=checksum,
    68→                dirty=False,
    69→            )
    70→
    71→    def on_write(self, path: str, data: bytes, mount: str) -> None:
    72→        checksum = _md5(data)
    73→        if path in self._inodes:
    74→            inode = self._inodes[path]
    75→            inode.checksum = checksum
    76→            inode.size = len(data)
    77→            inode.dirty = True
    78→        else:
    79→            self._inodes[path] = Inode(
    80→                virtual_path=path,
    81→                backend_mount=mount,
    82→                checksum=checksum,
    83→                size=len(data),
    84→                remote_checksum=None,
    85→                dirty=True,
    86→            )
    87→
    88→    def on_delete(self, path: str) -> None:
    89→        if path in self._inodes:
    90→            self._inodes[path].dirty = True
    91→            self._inodes[path].checksum = None
    92→            self._inodes[path].size = None
    93→
    94→    def on_sync(self, virtual_path: str, backend_path: str, data: bytes | None,
    95→                backend: BaseBackend) -> SyncResult:
    96→        """
    97→        Upload `data` to backend at `backend_path`. Pass None for deletions.
    98→        `virtual_path` tracks the inode; `backend_path` goes to the backend.
    99→        Returns a SyncResult describing the outcome.
   100→        """
   101→        inode = self._inodes.get(virtual_path)
   102→        op = "delete" if data is None else ("create" if (
   103→            inode and inode.remote_checksum is None) else "modify")
   104→        t0 = time.monotonic()
   105→        try:
   106→            if data is None:
   107→                backend.unlink(backend_path)
   108→            else:
   109→                backend.put(backend_path, data)
   110→            duration_ms = int((time.monotonic() - t0) * 1000)
   111→            checksum = _md5(data) if data is not None else None
   112→            if inode:
   113→                inode.remote_checksum = checksum
   114→                inode.dirty = False
   115→            return SyncResult(path=virtual_path,
   116→                              op=op,
   117→                              status="ok",
   118→                              bytes=len(data) if data else None,
   119→                              duration_ms=duration_ms)
   120→        except Exception as exc:
   121→            duration_ms = int((time.monotonic() - t0) * 1000)
   122→            return SyncResult(path=virtual_path,
   123→                              op=op,
   124→                              status="error",
   125→                              duration_ms=duration_ms,
   126→                              error=str(exc))
   127→
   128→    # ── queries ─────────────────────────────────────────────────────────────
   129→
   130→    def dirty(self) -> list[Inode]:
   131→        return [i for i in self._inodes.values() if i.dirty]
   132→
   133→    def status(self) -> list[Inode]:
   134→        return list(self._inodes.values())
   135→
   136→    def get(self, path: str) -> Inode | None:
   137→        return self._inodes.get(path)
   138→
   139→    def reset(self) -> None:
   140→        self._inodes.clear()
   141→
   142→
   143→def _md5(data: bytes) -> str:
   144→    return hashlib.md5(data).hexdigest()
   145→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

import hashlib
import time
from enum import Enum

from pydantic import BaseModel, ConfigDict

from mirage.backend.base import BaseBackend

class SyncPolicy(str, Enum):
    STAGED = "staged"
    IMMEDIATE = "immediate"
    MANUAL = "manual"

class Inode(BaseModel):
    virtual_path: str
    backend_mount: str
    checksum: str | None = None
    size: int | None = None
    remote_checksum: str | None = None
    dirty: bool = False

class SyncResult(BaseModel):
    model_config = ConfigDict(frozen=True)

    path: str
    op: str
    status: str
    remote: str | None = None
    bytes: int | None = None
    duration_ms: int = 0
    error: str | None = None

class DirtyTracker:
    """
    Tracks which virtual paths have local changes that haven't been synced
    to their backing backend.

    Lifecycle:
        on_read()  — record baseline remote checksum (not dirty)
        on_write() — update local checksum, mark dirty=True
        on_sync()  — upload to backend, clear dirty flag
    """

    def __init__(self) -> None:
        self._inodes: dict[str, Inode] = {}

    # ── event hooks ─────────────────────────────────────────────────────────

    def on_read(self, path: str, data: bytes, mount: str) -> None:
        checksum = _md5(data)
        if path in self._inodes:
            inode = self._inodes[path]
            inode.remote_checksum = checksum
            inode.checksum = checksum
            inode.size = len(data)
            inode.dirty = False
        else:
            self._inodes[path] = Inode(
                virtual_path=path,
                backend_mount=mount,
                checksum=checksum,
                size=len(data),
                remote_checksum=checksum,
                dirty=False,
            )

    def on_write(self, path: str, data: bytes, mount: str) -> None:
        checksum = _md5(data)
        if path in self._inodes:
            inode = self._inodes[path]
            inode.checksum = checksum
            inode.size = len(data)
            inode.dirty = True
        else:
            self._inodes[path] = Inode(
                virtual_path=path,
                backend_mount=mount,
                checksum=checksum,
                size=len(data),
                remote_checksum=None,
                dirty=True,
            )

    def on_delete(self, path: str) -> None:
        if path in self._inodes:
            self._inodes[path].dirty = True
            self._inodes[path].checksum = None
            self._inodes[path].size = None

    def on_sync(self, virtual_path: str, backend_path: str, data: bytes | None,
                backend: BaseBackend) -> SyncResult:
        """
        Upload `data` to backend at `backend_path`. Pass None for deletions.
        `virtual_path` tracks the inode; `backend_path` goes to the backend.
        Returns a SyncResult describing the outcome.
        """
        inode = self._inodes.get(virtual_path)
        op = "delete" if data is None else ("create" if (
            inode and inode.remote_checksum is None) else "modify")
        t0 = time.monotonic()
        try:
            if data is None:
                backend.unlink(backend_path)
            else:
                backend.put(backend_path, data)
            duration_ms = int((time.monotonic() - t0) * 1000)
            checksum = _md5(data) if data is not None else None
            if inode:
                inode.remote_checksum = checksum
                inode.dirty = False
            return SyncResult(path=virtual_path,
                              op=op,
                              status="ok",
                              bytes=len(data) if data else None,
                              duration_ms=duration_ms)
        except Exception as exc:
            duration_ms = int((time.monotonic() - t0) * 1000)
            return SyncResult(path=virtual_path,
                              op=op,
                              status="error",
                              duration_ms=duration_ms,
                              error=str(exc))

    # ── queries ─────────────────────────────────────────────────────────────

    def dirty(self) -> list[Inode]:
        return [i for i in self._inodes.values() if i.dirty]

    def status(self) -> list[Inode]:
        return list(self._inodes.values())

    def get(self, path: str) -> Inode | None:
        return self._inodes.get(path)

    def reset(self) -> None:
        self._inodes.clear()

def _md5(data: bytes) -> str:
    return hashlib.md5(data).hexdigest()


     1→from __future__ import annotations
     2→
     3→import time
     4→
     5→from mirage.backend.base import BaseBackend
     6→from mirage.backend.filetype import guess_type
     7→from pydantic import BaseModel
     8→
     9→from mirage.types import FileStat, MountMode
    10→from mirage.workspace.cache import LRUCache
    11→from mirage.workspace.consistency import ConsistencyPolicy, is_fresh
    12→from mirage.workspace.mount import MountRegistry
    13→from mirage.workspace.sync import DirtyTracker, Inode, SyncPolicy, SyncResult
    14→
    15→
    16→class TransferStats(BaseModel):
    17→    bytes_read: int = 0
    18→    bytes_written: int = 0
    19→    read_ops: int = 0
    20→    write_ops: int = 0
    21→    cache_hits: int = 0
    22→    cache_misses: int = 0
    23→    total_read_ms: int = 0
    24→    total_write_ms: int = 0
    25→
    26→
    27→class _PathLock:
    28→
    29→    def __init__(self, ws: Workspace, paths: list[str]) -> None:
    30→        self._ws = ws
    31→        self._paths = paths
    32→
    33→    def __enter__(self) -> _PathLock:
    34→        return self
    35→
    36→    def __exit__(self, *_: object) -> None:
    37→        self._ws.unlock_paths(self._paths)
    38→
    39→
    40→class Workspace:
    41→    """
    42→    Unified virtual filesystem over heterogeneous backends.
    43→
    44→    Mounts backends at virtual path prefixes and provides a command-level API
    45→    (cat, ls, write, cp, mv, rm, ...) with transparent caching
    46→    and write staging.
    47→
    48→    Example::
    49→
    50→        ws = Workspace(
    51→            {"/data/": S3Backend(S3Config(bucket="my-bucket")),
    52→             "/tmp/":  MemoryBackend()},
    53→            cache_limit="256MB",
    54→            sync_policy=SyncPolicy.STAGED,
    55→        )
    56→        content = ws.cat("/data/reports/q1.json")
    57→        ws.write("/tmp/summary.txt", b"hello")
    58→        ws.sync()
    59→    """
    60→
    61→    def __init__(
    62→        self,
    63→        backends: dict[str, BaseBackend | tuple],
    64→        cache_limit: str | int = "512MB",
    65→        sync_policy: SyncPolicy = SyncPolicy.STAGED,
    66→        mode: MountMode = MountMode.READ,
    67→        consistency: ConsistencyPolicy = ConsistencyPolicy.CACHED,
    68→        ttl_seconds: int = 300,
    69→    ) -> None:
    70→        self._registry = MountRegistry()
    71→        self._cache = LRUCache(cache_limit)
    72→        self._tracker = DirtyTracker()
    73→        self._sync_policy = sync_policy
    74→        self._ttl_seconds = ttl_seconds
    75→        self._locked_paths: set[str] = set()
    76→        self._transfer_stats: dict[str, TransferStats] = {}
    77→
    78→        for prefix, value in backends.items():
    79→            if isinstance(value, tuple) and len(value) == 3:
    80→                backend, mount_mode, mount_consistency = value
    81→            elif isinstance(value, tuple):
    82→                backend, mount_mode = value
    83→                mount_consistency = consistency
    84→            else:
    85→                backend = value
    86→                mount_mode = mode
    87→                mount_consistency = consistency
    88→            self._registry.mount(prefix, backend, mount_mode,
    89→                                 mount_consistency)
    90→
    91→    # ── mount management ────────────────────────────────────────────────────
    92→
    93→    def mount(
    94→            self,
    95→            prefix: str,
    96→            backend: BaseBackend,
    97→            mode: MountMode = MountMode.READ,
    98→            consistency: ConsistencyPolicy = ConsistencyPolicy.CACHED) -> None:
    99→        self._registry.mount(prefix, backend, mode, consistency)
   100→
   101→    def backend(self, path: str) -> BaseBackend:
   102→        backend, _, _ = self._registry.resolve(path)
   103→        return backend
   104→
   105→    # ── read ops ────────────────────────────────────────────────────────────
   106→
   107→    def cat(self, path: str) -> bytes:
   108→        inode = self._tracker.get(path)
   109→        if inode and inode.dirty:
   110→            entry = self._cache.get(path)
   111→            if entry is not None:
   112→                self._record_transfer(path,
   113→                                      "read",
   114→                                      len(entry.data),
   115→                                      0,
   116→                                      cache_hit=True)
   117→                return entry.data
   118→
   119→        entry = self._cache.get(path)
   120→        remote_stat = None
   121→        if entry is not None:
   122→            consistency = self._registry.mount_for(path).consistency
   123→            backend, bp, _ = self._registry.resolve(path)
   124→            fresh, remote_stat = is_fresh(entry, consistency,
   125→                                          self._ttl_seconds, backend, bp)
   126→            if fresh:
   127→                self._record_transfer(path,
   128→                                      "read",
   129→                                      len(entry.data),
   130→                                      0,
   131→                                      cache_hit=True)
   132→                return entry.data
   133→        else:
   134→            backend, bp, _ = self._registry.resolve(path)
   135→
   136→        t0 = time.monotonic()
   137→        data = backend.cat(bp)
   138→        duration_ms = int((time.monotonic() - t0) * 1000)
   139→        self._record_transfer(path,
   140→                              "read",
   141→                              len(data),
   142→                              duration_ms,
   143→                              cache_hit=False)
   144→        if remote_stat is None:
   145→            remote_stat = backend.stat(bp)
   146→        self._cache.put(path,
   147→                        data,
   148→                        etag=remote_stat.extra.get("etag"),
   149→                        modified=remote_stat.modified,
   150→                        size=remote_stat.size)
   151→        self._tracker.on_read(path, data, self._mount_prefix(path))
   152→        return data
   153→
   154→    def ls(self, path: str) -> list[str]:
   155→        backend, bp, _ = self._registry.resolve(path)
   156→        prefix = self._mount_prefix(path).rstrip("/")
   157→        backend_ok = False
   158→        try:
   159→            backend_entries = backend.ls(bp)
   160→            backend_ok = True
   161→        except FileNotFoundError:
   162→            backend_entries = []
   163→        result: set[str] = {
   164→            prefix + "/" + e.lstrip("/")
   165→            for e in backend_entries
   166→        }
   167→        norm_path = "/" + path.strip("/")
   168→        dir_prefix = norm_path.rstrip("/") + "/"
   169→        has_staged_children = False
   170→        for inode in self._tracker.dirty():
   171→            vp = inode.virtual_path
   172→            if not vp.startswith(dir_prefix):
   173→                continue
   174→            if inode.checksum is None:
   175→                result.discard(vp)
   176→                continue
   177→            has_staged_children = True
   178→            remainder = vp[len(dir_prefix):]
   179→            first = remainder.split("/")[0]
   180→            if not first:
   181→                continue
   182→            if "/" in remainder:
   183→                result.add(dir_prefix + first + "/")
   184→            else:
   185→                result.add(dir_prefix + first)
   186→        if not backend_ok and not has_staged_children:
   187→            raise FileNotFoundError(path)
   188→        return sorted(result)
   189→
   190→    def ls_l(self, path: str) -> list[FileStat]:
   191→        backend, bp, _ = self._registry.resolve(path)
   192→        return backend.ls_l(bp)
   193→
   194→    def stat(self, path: str) -> FileStat:
   195→        inode = self._tracker.get(path)
   196→        if inode and inode.dirty and inode.checksum is not None:
   197→            entry = self._cache.get(path)
   198→            size = len(entry.data) if entry is not None else inode.size
   199→            return FileStat(
   200→                name=path.rstrip("/").rsplit("/", 1)[-1],
   201→                size=size,
   202→                type=guess_type(path),
   203→            )
   204→        backend, bp, _ = self._registry.resolve(path)
   205→        return backend.stat(bp)
   206→
   207→    def exists(self, path: str) -> bool:
   208→        try:
   209→            self.stat(path)
   210→            return True
   211→        except (FileNotFoundError, ValueError):
   212→            return False
   213→
   214→    def head(self, path: str, lines: int = 10) -> bytes:
   215→        backend, bp, _ = self._registry.resolve(path)
   216→        return backend.head(bp, lines)
   217→
   218→    def tail(self, path: str, lines: int = 10) -> bytes:
   219→        backend, bp, _ = self._registry.resolve(path)
   220→        return backend.tail(bp, lines)
   221→
   222→    def read(self, path: str, offset: int, size: int) -> bytes:
   223→        inode = self._tracker.get(path)
   224→        if inode and inode.dirty:
   225→            entry = self._cache.get(path)
   226→            if entry is not None:
   227→                return entry.data[offset:offset + size]
   228→
   229→        entry = self._cache.get(path)
   230→        remote_stat = None
   231→        if entry is not None:
   232→            consistency = self._registry.mount_for(path).consistency
   233→            backend, bp, _ = self._registry.resolve(path)
   234→            fresh, remote_stat = is_fresh(entry, consistency,
   235→                                          self._ttl_seconds, backend, bp)
   236→            if fresh:
   237→                return entry.data[offset:offset + size]
   238→        else:
   239→            backend, bp, _ = self._registry.resolve(path)
   240→
   241→        data = backend.cat(bp)
   242→        if remote_stat is None:
   243→            remote_stat = backend.stat(bp)
   244→        self._cache.put(path,
   245→                        data,
   246→                        etag=remote_stat.extra.get("etag"),
   247→                        modified=remote_stat.modified,
   248→                        size=remote_stat.size)
   249→        self._tracker.on_read(path, data, self._mount_prefix(path))
   250→        return data[offset:offset + size]
   251→
   252→    def grep(self, pattern: str, path: str) -> list[str]:
   253→        backend, bp, _ = self._registry.resolve(path)
   254→        return backend.grep(pattern, bp)
   255→
   256→    # ── write ops ───────────────────────────────────────────────────────────
   257→
   258→    def write(self, path: str, data: bytes) -> None:
   259→        self._assert_not_locked(path)
   260→        self._assert_writable(path)
   261→        backend, bp, _ = self._registry.resolve(path)
   262→        self._cache.put(path, data)
   263→        self._tracker.on_write(path, data, self._mount_prefix(path))
   264→        self._record_transfer(path, "write", len(data), 0)
   265→        if self._sync_policy == SyncPolicy.IMMEDIATE:
   266→            backend.put(bp, data)
   267→            self._tracker.on_read(path, data, self._mount_prefix(path))
   268→
   269→    def mkdir(self, path: str) -> None:
   270→        self._assert_writable(path)
   271→        backend, bp, _ = self._registry.resolve(path)
   272→        backend.mkdir(bp)
   273→
   274→    def rm(self, path: str) -> None:
   275→        self._assert_writable(path)
   276→        backend, bp, _ = self._registry.resolve(path)
   277→        inode = self._tracker.get(path)
   278→        staged_only = inode and inode.dirty and inode.remote_checksum is None
   279→        if not staged_only:
   280→            backend.unlink(bp)
   281→        self._cache.invalidate(path)
   282→        self._tracker.on_delete(path)
   283→
   284→    def mv(self, src: str, dst: str) -> None:
   285→        self._assert_writable(src)
   286→        sb, sbp, _ = self._registry.resolve(src)
   287→        db, dbp, _ = self._registry.resolve(dst)
   288→        src_inode = self._tracker.get(src)
   289→        staged_only = (src_inode and src_inode.dirty
   290→                       and src_inode.remote_checksum is None)
   291→        if staged_only:
   292→            entry = self._cache.get(src)
   293→            data = entry.data if entry else b""
   294→            self._cache.put(dst, data)
   295→            self._tracker.on_write(dst, data, self._mount_prefix(dst))
   296→            self._cache.invalidate(src)
   297→            self._tracker.on_delete(src)
   298→        elif sb is db:
   299→            sb.rename(sbp, dbp)
   300→            self._cache.invalidate(src)
   301→        else:
   302→            data = sb.cat(sbp)
   303→            db.put(dbp, data)
   304→            sb.unlink(sbp)
   305→            self._cache.invalidate(src)
   306→
   307→    def cp(self, src: str, dst: str) -> None:
   308→        self._assert_writable(dst)
   309→        data = self.cat(src)
   310→        db, dbp, _ = self._registry.resolve(dst)
   311→        db.put(dbp, data)
   312→
   313→    # ── sync lifecycle ──────────────────────────────────────────────────────
   314→
   315→    def sync(self, path: str | None = None) -> list[SyncResult]:
   316→        results: list[SyncResult] = []
   317→        targets = [
   318→            i for i in self._tracker.dirty()
   319→            if path is None or i.virtual_path == path
   320→        ]
   321→        for inode in targets:
   322→            backend, bp, _ = self._registry.resolve(inode.virtual_path)
   323→            entry = self._cache.get(inode.virtual_path)
   324→            data = entry.data if entry else None
   325→            result = self._tracker.on_sync(inode.virtual_path, bp, data,
   326→                                           backend)
   327→            results.append(result)
   328→        return results
   329→
   330→    def status(self) -> list[Inode]:
   331→        return self._tracker.status()
   332→
   333→    def reset(self) -> None:
   334→        self._tracker.reset()
   335→        self._cache.clear()
   336→
   337→    # ── path locking ─────────────────────────────────────────────────────────
   338→
   339→    def _lock_path(self, path: str) -> None:
   340→        self._locked_paths.add(path)
   341→
   342→    def unlock_paths(self, paths: list[str]) -> None:
   343→        for p in paths:
   344→            self._locked_paths.discard(p)
   345→
   346→    def lock_paths(self, paths: list[str]) -> _PathLock:
   347→        for p in paths:
   348→            self._lock_path(p)
   349→        return _PathLock(self, paths)
   350→
   351→    def _assert_not_locked(self, path: str) -> None:
   352→        if path in self._locked_paths:
   353→            raise PermissionError(
   354→                f"path {path!r} is locked by remote execution")
   355→
   356→    # ── helpers ─────────────────────────────────────────────────────────────
   357→
   358→    def _mount_prefix(self, path: str) -> str:
   359→        norm = "/" + path.strip("/")
   360→        for m in self._registry.mounts():
   361→            if norm == m.prefix.rstrip("/") or norm.startswith(m.prefix):
   362→                return m.prefix
   363→        return "/"
   364→
   365→    def _assert_writable(self, path: str) -> None:
   366→        _, _, mode = self._registry.resolve(path)
   367→        if mode == MountMode.READ:
   368→            raise PermissionError(f"mount at {path!r} is read-only")
   369→
   370→    def _record_transfer(self,
   371→                         path: str,
   372→                         op: str,
   373→                         nbytes: int,
   374→                         duration_ms: int,
   375→                         cache_hit: bool | None = None) -> None:
   376→        prefix = self._mount_prefix(path)
   377→        if prefix not in self._transfer_stats:
   378→            self._transfer_stats[prefix] = TransferStats()
   379→        stats = self._transfer_stats[prefix]
   380→        if op == "read":
   381→            stats.bytes_read += nbytes
   382→            stats.read_ops += 1
   383→            stats.total_read_ms += duration_ms
   384→            if cache_hit is True:
   385→                stats.cache_hits += 1
   386→            elif cache_hit is False:
   387→                stats.cache_misses += 1
   388→        elif op == "write":
   389→            stats.bytes_written += nbytes
   390→            stats.write_ops += 1
   391→            stats.total_write_ms += duration_ms
   392→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

from __future__ import annotations

import time

from mirage.backend.base import BaseBackend
from mirage.backend.filetype import guess_type
from pydantic import BaseModel

from mirage.types import FileStat, MountMode
from mirage.workspace.cache import LRUCache
from mirage.workspace.consistency import ConsistencyPolicy, is_fresh
from mirage.workspace.mount import MountRegistry
from mirage.workspace.sync import DirtyTracker, Inode, SyncPolicy, SyncResult

class TransferStats(BaseModel):
    bytes_read: int = 0
    bytes_written: int = 0
    read_ops: int = 0
    write_ops: int = 0
    cache_hits: int = 0
    cache_misses: int = 0
    total_read_ms: int = 0
    total_write_ms: int = 0

class _PathLock:

    def __init__(self, ws: Workspace, paths: list[str]) -> None:
        self._ws = ws
        self._paths = paths

    def __enter__(self) -> _PathLock:
        return self

    def __exit__(self, *_: object) -> None:
        self._ws.unlock_paths(self._paths)

class Workspace:
    """
    Unified virtual filesystem over heterogeneous backends.

    Mounts backends at virtual path prefixes and provides a command-level API
    (cat, ls, write, cp, mv, rm, ...) with transparent caching
    and write staging.

    Example::

        ws = Workspace(
            {"/data/": S3Backend(S3Config(bucket="my-bucket")),
             "/tmp/":  MemoryBackend()},
            cache_limit="256MB",
            sync_policy=SyncPolicy.STAGED,
        )
        content = ws.cat("/data/reports/q1.json")
        ws.write("/tmp/summary.txt", b"hello")
        ws.sync()
    """

    def __init__(
        self,
        backends: dict[str, BaseBackend | tuple],
        cache_limit: str | int = "512MB",
        sync_policy: SyncPolicy = SyncPolicy.STAGED,
        mode: MountMode = MountMode.READ,
        consistency: ConsistencyPolicy = ConsistencyPolicy.CACHED,
        ttl_seconds: int = 300,
    ) -> None:
        self._registry = MountRegistry()
        self._cache = LRUCache(cache_limit)
        self._tracker = DirtyTracker()
        self._sync_policy = sync_policy
        self._ttl_seconds = ttl_seconds
        self._locked_paths: set[str] = set()
        self._transfer_stats: dict[str, TransferStats] = {}

        for prefix, value in backends.items():
            if isinstance(value, tuple) and len(value) == 3:
                backend, mount_mode, mount_consistency = value
            elif isinstance(value, tuple):
                backend, mount_mode = value
                mount_consistency = consistency
            else:
                backend = value
                mount_mode = mode
                mount_consistency = consistency
            self._registry.mount(prefix, backend, mount_mode,
                                 mount_consistency)

    # ── mount management ────────────────────────────────────────────────────

    def mount(
            self,
            prefix: str,
            backend: BaseBackend,
            mode: MountMode = MountMode.READ,
            consistency: ConsistencyPolicy = ConsistencyPolicy.CACHED) -> None:
        self._registry.mount(prefix, backend, mode, consistency)

    def backend(self, path: str) -> BaseBackend:
        backend, _, _ = self._registry.resolve(path)
        return backend

    # ── read ops ────────────────────────────────────────────────────────────

    def cat(self, path: str) -> bytes:
        inode = self._tracker.get(path)
        if inode and inode.dirty:
            entry = self._cache.get(path)
            if entry is not None:
                self._record_transfer(path,
                                      "read",
                                      len(entry.data),
                                      0,
                                      cache_hit=True)
                return entry.data

        entry = self._cache.get(path)
        remote_stat = None
        if entry is not None:
            consistency = self._registry.mount_for(path).consistency
            backend, bp, _ = self._registry.resolve(path)
            fresh, remote_stat = is_fresh(entry, consistency,
                                          self._ttl_seconds, backend, bp)
            if fresh:
                self._record_transfer(path,
                                      "read",
                                      len(entry.data),
                                      0,
                                      cache_hit=True)
                return entry.data
        else:
            backend, bp, _ = self._registry.resolve(path)

        t0 = time.monotonic()
        data = backend.cat(bp)
        duration_ms = int((time.monotonic() - t0) * 1000)
        self._record_transfer(path,
                              "read",
                              len(data),
                              duration_ms,
                              cache_hit=False)
        if remote_stat is None:
            remote_stat = backend.stat(bp)
        self._cache.put(path,
                        data,
                        etag=remote_stat.extra.get("etag"),
                        modified=remote_stat.modified,
                        size=remote_stat.size)
        self._tracker.on_read(path, data, self._mount_prefix(path))
        return data

    def ls(self, path: str) -> list[str]:
        backend, bp, _ = self._registry.resolve(path)
        prefix = self._mount_prefix(path).rstrip("/")
        backend_ok = False
        try:
            backend_entries = backend.ls(bp)
            backend_ok = True
        except FileNotFoundError:
            backend_entries = []
        result: set[str] = {
            prefix + "/" + e.lstrip("/")
            for e in backend_entries
        }
        norm_path = "/" + path.strip("/")
        dir_prefix = norm_path.rstrip("/") + "/"
        has_staged_children = False
        for inode in self._tracker.dirty():
            vp = inode.virtual_path
            if not vp.startswith(dir_prefix):
                continue
            if inode.checksum is None:
                result.discard(vp)
                continue
            has_staged_children = True
            remainder = vp[len(dir_prefix):]
            first = remainder.split("/")[0]
            if not first:
                continue
            if "/" in remainder:
                result.add(dir_prefix + first + "/")
            else:
                result.add(dir_prefix + first)
        if not backend_ok and not has_staged_children:
            raise FileNotFoundError(path)
        return sorted(result)

    def ls_l(self, path: str) -> list[FileStat]:
        backend, bp, _ = self._registry.resolve(path)
        return backend.ls_l(bp)

    def stat(self, path: str) -> FileStat:
        inode = self._tracker.get(path)
        if inode and inode.dirty and inode.checksum is not None:
            entry = self._cache.get(path)
            size = len(entry.data) if entry is not None else inode.size
            return FileStat(
                name=path.rstrip("/").rsplit("/", 1)[-1],
                size=size,
                type=guess_type(path),
            )
        backend, bp, _ = self._registry.resolve(path)
        return backend.stat(bp)

    def exists(self, path: str) -> bool:
        try:
            self.stat(path)
            return True
        except (FileNotFoundError, ValueError):
            return False

    def head(self, path: str, lines: int = 10) -> bytes:
        backend, bp, _ = self._registry.resolve(path)
        return backend.head(bp, lines)

    def tail(self, path: str, lines: int = 10) -> bytes:
        backend, bp, _ = self._registry.resolve(path)
        return backend.tail(bp, lines)

    def read(self, path: str, offset: int, size: int) -> bytes:
        inode = self._tracker.get(path)
        if inode and inode.dirty:
            entry = self._cache.get(path)
            if entry is not None:
                return entry.data[offset:offset + size]

        entry = self._cache.get(path)
        remote_stat = None
        if entry is not None:
            consistency = self._registry.mount_for(path).consistency
            backend, bp, _ = self._registry.resolve(path)
            fresh, remote_stat = is_fresh(entry, consistency,
                                          self._ttl_seconds, backend, bp)
            if fresh:
                return entry.data[offset:offset + size]
        else:
            backend, bp, _ = self._registry.resolve(path)

        data = backend.cat(bp)
        if remote_stat is None:
            remote_stat = backend.stat(bp)
        self._cache.put(path,
                        data,
                        etag=remote_stat.extra.get("etag"),
                        modified=remote_stat.modified,
                        size=remote_stat.size)
        self._tracker.on_read(path, data, self._mount_prefix(path))
        return data[offset:offset + size]

    def grep(self, pattern: str, path: str) -> list[str]:
        backend, bp, _ = self._registry.resolve(path)
        return backend.grep(pattern, bp)

    # ── write ops ───────────────────────────────────────────────────────────

    def write(self, path: str, data: bytes) -> None:
        self._assert_not_locked(path)
        self._assert_writable(path)
        backend, bp, _ = self._registry.resolve(path)
        self._cache.put(path, data)
        self._tracker.on_write(path, data, self._mount_prefix(path))
        self._record_transfer(path, "write", len(data), 0)
        if self._sync_policy == SyncPolicy.IMMEDIATE:
            backend.put(bp, data)
            self._tracker.on_read(path, data, self._mount_prefix(path))

    def mkdir(self, path: str) -> None:
        self._assert_writable(path)
        backend, bp, _ = self._registry.resolve(path)
        backend.mkdir(bp)

    def rm(self, path: str) -> None:
        self._assert_writable(path)
        backend, bp, _ = self._registry.resolve(path)
        inode = self._tracker.get(path)
        staged_only = inode and inode.dirty and inode.remote_checksum is None
        if not staged_only:
            backend.unlink(bp)
        self._cache.invalidate(path)
        self._tracker.on_delete(path)

    def mv(self, src: str, dst: str) -> None:
        self._assert_writable(src)
        sb, sbp, _ = self._registry.resolve(src)
        db, dbp, _ = self._registry.resolve(dst)
        src_inode = self._tracker.get(src)
        staged_only = (src_inode and src_inode.dirty
                       and src_inode.remote_checksum is None)
        if staged_only:
            entry = self._cache.get(src)
            data = entry.data if entry else b""
            self._cache.put(dst, data)
            self._tracker.on_write(dst, data, self._mount_prefix(dst))
            self._cache.invalidate(src)
            self._tracker.on_delete(src)
        elif sb is db:
            sb.rename(sbp, dbp)
            self._cache.invalidate(src)
        else:
            data = sb.cat(sbp)
            db.put(dbp, data)
            sb.unlink(sbp)
            self._cache.invalidate(src)

    def cp(self, src: str, dst: str) -> None:
        self._assert_writable(dst)
        data = self.cat(src)
        db, dbp, _ = self._registry.resolve(dst)
        db.put(dbp, data)

    # ── sync lifecycle ──────────────────────────────────────────────────────

    def sync(self, path: str | None = None) -> list[SyncResult]:
        results: list[SyncResult] = []
        targets = [
            i for i in self._tracker.dirty()
            if path is None or i.virtual_path == path
        ]
        for inode in targets:
            backend, bp, _ = self._registry.resolve(inode.virtual_path)
            entry = self._cache.get(inode.virtual_path)
            data = entry.data if entry else None
            result = self._tracker.on_sync(inode.virtual_path, bp, data,
                                           backend)
            results.append(result)
        return results

    def status(self) -> list[Inode]:
        return self._tracker.status()

    def reset(self) -> None:
        self._tracker.reset()
        self._cache.clear()

    # ── path locking ─────────────────────────────────────────────────────────

    def _lock_path(self, path: str) -> None:
        self._locked_paths.add(path)

    def unlock_paths(self, paths: list[str]) -> None:
        for p in paths:
            self._locked_paths.discard(p)

    def lock_paths(self, paths: list[str]) -> _PathLock:
        for p in paths:
            self._lock_path(p)
        return _PathLock(self, paths)

    def _assert_not_locked(self, path: str) -> None:
        if path in self._locked_paths:
            raise PermissionError(
                f"path {path!r} is locked by remote execution")

    # ── helpers ─────────────────────────────────────────────────────────────

    def _mount_prefix(self, path: str) -> str:
        norm = "/" + path.strip("/")
        for m in self._registry.mounts():
            if norm == m.prefix.rstrip("/") or norm.startswith(m.prefix):
                return m.prefix
        return "/"

    def _assert_writable(self, path: str) -> None:
        _, _, mode = self._registry.resolve(path)
        if mode == MountMode.READ:
            raise PermissionError(f"mount at {path!r} is read-only")

    def _record_transfer(self,
                         path: str,
                         op: str,
                         nbytes: int,
                         duration_ms: int,
                         cache_hit: bool | None = None) -> None:
        prefix = self._mount_prefix(path)
        if prefix not in self._transfer_stats:
            self._transfer_stats[prefix] = TransferStats()
        stats = self._transfer_stats[prefix]
        if op == "read":
            stats.bytes_read += nbytes
            stats.read_ops += 1
            stats.total_read_ms += duration_ms
            if cache_hit is True:
                stats.cache_hits += 1
            elif cache_hit is False:
                stats.cache_misses += 1
        elif op == "write":
            stats.bytes_written += nbytes
            stats.write_ops += 1
            stats.total_write_ms += duration_ms


Now update `sync.py` to import from `workspace/types.py` and remove the inline class definitions:


Edit

import hashlib
import time
from enum import Enum

from pydantic import BaseModel, ConfigDict

from mirage.backend.base import BaseBackend

class SyncPolicy(str, Enum):
    STAGED = "staged"
    IMMEDIATE = "immediate"
    MANUAL = "manual"

class Inode(BaseModel):
    virtual_path: str
    backend_mount: str
    checksum: str | None = None
    size: int | None = None
    remote_checksum: str | None = None
    dirty: bool = False

class SyncResult(BaseModel):
    model_config = ConfigDict(frozen=True)

    path: str
    op: str
    status: str
    remote: str | None = None
    bytes: int | None = None
    duration_ms: int = 0
    error: str | None = None

class DirtyTracker:

import hashlib
import time

from mirage.backend.base import BaseBackend
from mirage.workspace.types import Inode, SyncPolicy, SyncResult

class DirtyTracker:


The file /Users/agent/strukto/mirage/mirage/workspace/sync.py has been updated successfully.

import hashlib
import time

from mirage.backend.base import BaseBackend
from mirage.workspace.types import Inode, SyncPolicy, SyncResult

class DirtyTracker:

import hashlib
import time
from enum import Enum

from pydantic import BaseModel, ConfigDict

from mirage.backend.base import BaseBackend

class SyncPolicy(str, Enum):
    STAGED = "staged"
    IMMEDIATE = "immediate"
    MANUAL = "manual"

class Inode(BaseModel):
    virtual_path: str
    backend_mount: str
    checksum: str | None = None
    size: int | None = None
    remote_checksum: str | None = None
    dirty: bool = False

class SyncResult(BaseModel):
    model_config = ConfigDict(frozen=True)

    path: str
    op: str
    status: str
    remote: str | None = None
    bytes: int | None = None
    duration_ms: int = 0
    error: str | None = None

class DirtyTracker:
    """
    Tracks which virtual paths have local changes that haven't been synced
    to their backing backend.

    Lifecycle:
        on_read()  — record baseline remote checksum (not dirty)
        on_write() — update local checksum, mark dirty=True
        on_sync()  — upload to backend, clear dirty flag
    """

    def __init__(self) -> None:
        self._inodes: dict[str, Inode] = {}

    # ── event hooks ─────────────────────────────────────────────────────────

    def on_read(self, path: str, data: bytes, mount: str) -> None:
        checksum = _md5(data)
        if path in self._inodes:
            inode = self._inodes[path]
            inode.remote_checksum = checksum
            inode.checksum = checksum
            inode.size = len(data)
            inode.dirty = False
        else:
            self._inodes[path] = Inode(
                virtual_path=path,
                backend_mount=mount,
                checksum=checksum,
                size=len(data),
                remote_checksum=checksum,
                dirty=False,
            )

    def on_write(self, path: str, data: bytes, mount: str) -> None:
        checksum = _md5(data)
        if path in self._inodes:
            inode = self._inodes[path]
            inode.checksum = checksum
            inode.size = len(data)
            inode.dirty = True
        else:
            self._inodes[path] = Inode(
                virtual_path=path,
                backend_mount=mount,
                checksum=checksum,
                size=len(data),
                remote_checksum=None,
                dirty=True,
            )

    def on_delete(self, path: str) -> None:
        if path in self._inodes:
            self._inodes[path].dirty = True
            self._inodes[path].checksum = None
            self._inodes[path].size = None

    def on_sync(self, virtual_path: str, backend_path: str, data: bytes | None,
                backend: BaseBackend) -> SyncResult:
        """
        Upload `data` to backend at `backend_path`. Pass None for deletions.
        `virtual_path` tracks the inode; `backend_path` goes to the backend.
        Returns a SyncResult describing the outcome.
        """
        inode = self._inodes.get(virtual_path)
        op = "delete" if data is None else ("create" if (
            inode and inode.remote_checksum is None) else "modify")
        t0 = time.monotonic()
        try:
            if data is None:
                backend.unlink(backend_path)
            else:
                backend.put(backend_path, data)
            duration_ms = int((time.monotonic() - t0) * 1000)
            checksum = _md5(data) if data is not None else None
            if inode:
                inode.remote_checksum = checksum
                inode.dirty = False
            return SyncResult(path=virtual_path,
                              op=op,
                              status="ok",
                              bytes=len(data) if data else None,
                              duration_ms=duration_ms)
        except Exception as exc:
            duration_ms = int((time.monotonic() - t0) * 1000)
            return SyncResult(path=virtual_path,
                              op=op,
                              status="error",
                              duration_ms=duration_ms,
                              error=str(exc))

    # ── queries ─────────────────────────────────────────────────────────────

    def dirty(self) -> list[Inode]:
        return [i for i in self._inodes.values() if i.dirty]

    def status(self) -> list[Inode]:
        return list(self._inodes.values())

    def get(self, path: str) -> Inode | None:
        return self._inodes.get(path)

    def reset(self) -> None:
        self._inodes.clear()

def _md5(data: bytes) -> str:
    return hashlib.md5(data).hexdigest()

-from pydantic import BaseModel, ConfigDict

+from mirage.workspace.types import Inode, SyncPolicy, SyncResult

-    model_config = ConfigDict(frozen=True)


Now update `workspace.py` to import `TransferStats` from `workspace/types.py` and remove the class definition:


from pydantic import BaseModel

from mirage.types import FileStat, MountMode
from mirage.workspace.cache import LRUCache
from mirage.workspace.consistency import ConsistencyPolicy, is_fresh
from mirage.workspace.mount import MountRegistry
from mirage.workspace.sync import DirtyTracker, Inode, SyncPolicy, SyncResult

class TransferStats(BaseModel):
    bytes_read: int = 0
    bytes_written: int = 0
    read_ops: int = 0
    write_ops: int = 0
    cache_hits: int = 0
    cache_misses: int = 0
    total_read_ms: int = 0
    total_write_ms: int = 0

class _PathLock:

from mirage.types import FileStat, MountMode
from mirage.workspace.cache import LRUCache
from mirage.workspace.consistency import ConsistencyPolicy, is_fresh
from mirage.workspace.mount import MountRegistry
from mirage.workspace.sync import DirtyTracker
from mirage.workspace.types import Inode, SyncPolicy, SyncResult, TransferStats

class _PathLock: