deepseek-ai/deepseek-harness · error · FsError

FS_NOT_OBSERVED

FS_NOT_OBSERVED

Error message

cannot overwrite existing "${target.displayPath}" without reading it first

What it means

Error "cannot overwrite existing "${target.displayPath}" without reading it first" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/e2b/fs-e2b/src/index.ts:478

      const entry = await sandbox.files.getInfo(path, signalOpts(signal))
      assertNotAborted(signal, 'stat')
      return entry
    } catch (error: unknown) {
      if (error instanceof FileNotFoundError) return undefined
      throw mapError(error, 'stat', displayPath, signal)
    }
  }

  private async requireRegular(target: FsTarget, signal?: AbortSignal): Promise<FsInfo> {
    const info = await this.stat(target, signal)
    if (info === undefined) throw new FsError(`cannot read "${target.displayPath}": not found`, 'FS_NOT_FOUND')
    if (info.type !== 'file') throw new FsError(`cannot read "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
    return info
  }

  private checkWriteIntent(existing: EntryInfo | undefined, expected: FsWriteIntent | undefined, target: FsTarget): void {
    if (expected?.kind === 'createIfAbsent' && existing !== undefined) {
      throw new FsError(`cannot overwrite existing "${target.displayPath}" without reading it first`, 'FS_NOT_OBSERVED')
    }
    if (expected?.kind === 'replaceIfVersion') {
      if (existing === undefined || entryVersion(existing) !== expected.version) {
        throw new FsError(`cannot write "${target.displayPath}": file changed since it was read`, 'FS_STALE_VERSION')
      }
    }
  }

  private async readForDiff(target: FsTarget, signal?: AbortSignal): Promise<string | null> {
    try {
      const sandbox = await this.ctx.e2b.getSandbox()
      const bytes = await sandbox.files.read(String(target.targetKey), { format: 'bytes', ...signalOpts(signal) })
      assertNotAborted(signal, 'read')
      return normalizeLineEndings(decodeText(bytes, target.displayPath, bytes.length))
    } catch (error: unknown) {
      if (error instanceof FsError && error.code === 'FS_NOT_TEXT') return null
      throw mapError(error, 'read', target.displayPath, signal)
    }

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/e2b/fs-e2b/src/index.ts:478 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/e6c8799f46da88c1. Report an issue: GitHub.