Repository navigation
Windows CJK characters garbled in bash tool output #24080
Description
Summary
On Windows with CJK locales (zh-CN, ja-JP, ko-KR), the bash tool spawns child processes that inherit the system default code page (e.g. 936 GBK) instead of UTF-8. The parent process may have chcp 65001 set, but it is NOT inherited by spawned child processes. This causes non-ASCII output to be encoded in the system ANSI encoding while OpenCode reads it as UTF-8, producing garbled text.
Changes
One file: packages/opencode/src/tool/bash.ts, in the cmd() function.
PowerShell branch: Adds chcp 65001, [Console]::OutputEncoding, and $OutputEncoding — all three are needed because:
| Setting | Scope |
|---|---|
chcp 65001 |
Console code page |
[Console]::OutputEncoding |
.NET output encoding |
$OutputEncoding |
PowerShell pipeline encoding |
cmd.exe branch: chcp 65001 alone is sufficient (no .NET encoding layer).
Reproducing
On a Chinese/Japanese/Korean Windows system:
# Without fix: garbled output
Write-Output "你好世界"
# outputs garbled text like "ä½ å¥½ä¸ç\U+fffd\U+fffd"
# With fix: correct output
Write-Output "你好世界"
# outputs "你好世界"Testing
- A single file change in
cmd()function - Win32-only code path, does not affect macOS/Linux
- Only modifies the spawned command prefix, does not change tool behavior
Activity
github-actions commentedon Apr 24, 2026
This issue might be a duplicate of existing issues. Please check:
[Console]::OutputEncoding,chcp 65001)Please review these issues before proceeding, as your report covers the same problem and proposed fix as #23636 in particular.
fkyah3 commentedon Apr 24, 2026
Duplicate of #23636. The fix is already implemented and tested on my fork — I added a comment on that issue with the complete implementation details including the cmd.exe branch fix that the original proposal missed.