[Windows 10] oh-my-opencode installation fails with EPERM: Operation not permitted (NtSetInformationFile())

[jarvis000000]

Description

Bug Report: oh-my-opencode fails to install on Windows 10 due to EPERM error

Summary

Installing oh-my-opencode plugin on Windows 10 fails with an EPERM (Operation not permitted) error when Bun attempts to move the @ast-grep/cli-win32-x64-msvc package to the cache directory. This causes OpenCode to hang indefinitely during plugin loading.

Environment

System Information

• OS: Microsoft Windows 10 专业版
• Version: 10.0.19045 N/A Build 19045
• System Type: x64-based PC
• BIOS: American Megatrends International, LLC. 2.C0, 2021/2/1

Software Versions

• OpenCode: 1.1.12
• Bun: 1.3.5
• Node.js: v24.12.0
• oh-my-opencode: 2.14.0 (latest)

Security Settings

• Windows Defender Real-time protection: Disabled
• Administrator privileges: Tested, still fails
• Running from: Git Bash on Windows

Steps to Reproduce

1. Create OpenCode config file:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["oh-my-opencode"]
}

2. Run opencode from the terminal
3. Observe that OpenCode hangs and never starts the TUI

Expected Behavior

• oh-my-opencode plugin should install successfully
• OpenCode should start normally with the plugin loaded

Actual Behavior

• OpenCode hangs indefinitely
• Plugin installation fails with EPERM error

Error Log

INFO  2026-01-10T18:34:16 +88ms service=default directory=C:\Users\24237\.config\opencode creating instance
INFO  2026-01-10T18:34:16 +0ms service=project directory=C:\Users\24237\.config\opencode fromDirectory
INFO  2026-01-10T18:34:16 +40ms service=default directory=C:\Users\24237\.config\opencode bootstrapping
INFO  2026-01-10T18:34:16 +4ms service=config path=C:\Users\24237\.config\opencode\config.json loading
INFO  2026-01-10T18:34:16 +1ms service=config path=C:\Users\24237\.config\opencode\opencode.json loading
INFO  2026-01-10T18:34:16 +7ms service=config path=C:\Users\24237\.config\opencode\opencode.jsonc loading
INFO  2026-01-10T18:34:16 +5ms service=config path=C:\Users\24237\.config\opencode\opencode.json loading
INFO  2026-01-10T18:34:16 +3ms service=bun cmd=["C:\\Users\\24237\\AppData\\Roaming\\npm\\node_modules\\opencode-ai\\node_modules\\opencode-windows-x64\\bin\\opencode.exe","add","@opencode-ai/[email protected]","--exact"] cwd=C:\Users\24237\.config\opencode running
INFO  2026-01-10T18:34:16 +23ms service=plugin name=CodexAuthPlugin loading internal plugin
INFO  2026-01-10T18:34:16 +0ms service=plugin path=oh-my-opencode loading plugin
INFO  2026-01-10T18:34:16 +1ms service=bun pkg=oh-my-opencode version=latest installing package using Bun's default registry resolution
INFO  2026-01-10T18:34:16 +0ms service=bun cmd=["C:\\Users\\24237\\AppData\\Roaming\\npm\\node_modules\\opencode-ai\\node_modules\\opencode-windows-x64\\bin\\opencode.exe","add","--force","--exact","--cwd","C:\\Users\\24237\\.cache\\opencode","oh-my-opencode@latest"] cwd=C:\Users\24237\.cache\opencode running
INFO  2026-01-10T18:34:16 +31ms service=bun code=0 stdout=bun add v1.3.5 (1e86cebd)

installed @opencode-ai/[email protected]

[15.00ms] done
 stderr=Saved lockfile
 done
INFO  2026-01-10T18:34:16 +0ms service=bun cmd=["C:\\Users\\24237\\AppData\\Roaming\\npm\\node_modules\\opencode-ai\\node_modules\\opencode-windows-x64\\bin\\opencode.exe","install"] cwd=C:\Users\24237\.config\opencode running
INFO  2026-01-10T18:34:16 +46ms service=bun code=0 stdout=bun install v1.3.5 (1e86cebd)

Checked 3 installs across 4 packages (no changes) [8.00ms]
 stderr= done
INFO  2026-01-10T18:34:19 +2519ms service=bun code=1 stdout=bun add v1.3.5 (1e86cebd)
 stderr=[2.16ms] migrated lockfile from package-lock.json
Resolving dependencies
Resolved, downloaded and extracted [1]
error: moving "@ast-grep/cli-win32-x64-msvc" to cache dir failed
EPERM: Operation not permitted (NtSetInformationFile())
  From: .3cfdfb7be63bebb7-00000001.cli-win32-x64-msvc
    To: @ast-grep/[email protected]@@@1
error: InstallFailed extracting tarball from @ast-grep/cli-win32-x64-msvc
 done
ERROR 2026-01-10T18:34:19 +1ms service=default e=BunInstallFailedError exception

Additional Information

Binary File Status

The @ast-grep/cli-win32-x64-msvc binary file exists and has correct permissions:

-rwxr-xr-x 3 24237 197609 45M Jan 11 01:39 ~/.cache/opencode/node_modules/@ast-grep/cli-win32-x64-msvc/ast-grep.exe

Working Directory

• Bun cache: C:\Users\24237\.bun\install\cache
• OpenCode cache: C:\Users\24237\.cache\opencode
• Config: C:\Users\24237\.config\opencode

Attempted Workarounds

1. Disabled Windows Defender Real-time Protection - No effect
2. Run as Administrator - No effect (tested via PowerShell)
3. Use alternative cache directory with --cache-dir - No effect
4. Try different oh-my-opencode versions (2.13.2, 3.0.0-beta.2) - Same error
5. Use npm instead of bun for manual installation - Installs successfully but runtime fails

Bun's NtSetInformationFile() Issue

The error occurs when Bun calls NtSetInformationFile() to move the extracted package from a temporary location to the cache directory. This appears to be a known issue with Bun on Windows when handling large binary packages.

Possible Root Causes

1. File handle not properly closed: The extracted binary file may not be fully closed before Bun attempts to move it
2. Anti-virus interference: Despite disabling Windows Defender, other security software may be interfering
3. Bun's Windows file system implementation: Bun may have issues with NtSetInformationFile() on Windows 10
4. File locking by another process: Another process (possibly Git Bash) may be holding a lock on the file

Suggested Solutions

1. Add Windows-specific installation logic in oh-my-opencode to handle the binary package installation manually
2. Use npm instead of bun for installing dependencies on Windows (if supported by OpenCode)
3. Pre-compile ast-grep for Windows to avoid runtime installation
4. Add a retry mechanism in OpenCode's plugin installer to handle transient EPERM errors
5. Improve error reporting to provide actionable guidance to users (e.g., "Try running as administrator" or "Try installing via WSL")

Workarounds

Users experiencing this issue can work around it by:

1. Installing OpenCode and oh-my-opencode in WSL (Windows Subsystem for Linux)
2. Using Docker or a virtual machine to run Linux-based development environment

References

• Related issue: https://github.com/code-yeongyu/oh-my-opencode/issues
• Bun Windows file system discussion
• Windows NtSetInformationFile() documentation

2026-01-10T183416.log

opencode_debug.log opencode_system_info.txt