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[PR #7028] fix(clipboard): add OSC 52 fallback for SSH/tmux environments #12213

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opened 2026-02-16 18:17:08 -05:00 by yindo · 0 comments
yindo commented 2026-02-16 18:17:08 -05:00
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Original Pull Request: https://github.com/anomalyco/opencode/pull/7028

State: open
Merged: No

Problem

Clipboard copy operations (e.g., Ctrl+X Y to copy assistant message) silently fail when running opencode over SSH or in tmux on a remote Linux server without X11/Wayland display.

Root cause: The fallback path uses clipboardy, which relies on xsel/xclip and requires a local display ($DISPLAY or $WAYLAND_DISPLAY). In headless SSH/tmux environments, these tools aren't available or don't work, causing clipboard operations to fail silently.

Solution

Add OSC 52 escape sequence support as a fallback when clipboardy fails.
OSC 52 is a terminal escape sequence standard that allows applications to set the system clipboard through the terminal emulator. It's supported by:

  • iTerm2
  • kitty
  • Alacritty
  • Windows Terminal
  • tmux (with set-clipboard option)
  • Many other modern terminal emulators

Changes

  • Added copyViaOSC52() function that sends OSC 52 escape sequences
  • Handles tmux passthrough wrapping when $TMUX is set
  • Modified fallback logic: try clipboardy first → fall back to OSC 52 on failure

Behavior

Environment Before After
macOS local osascript ✅ osascript ✅ (unchanged)
Linux + X11/Wayland xclip/xsel/wl-copy ✅ xclip/xsel/wl-copy ✅ (unchanged)
Windows powershell ✅ powershell ✅ (unchanged)
SSH/tmux (no display) clipboardy ❌ (silent fail) clipboardy → OSC 52 ✅

No breaking changes - existing behavior preserved for all native clipboard methods.

Testing

  1. SSH into a remote Linux server
  2. Run opencode in tmux with iTerm2 integration
  3. Get a response from the assistant
  4. Press Ctrl+X Y to copy the assistant's message
  5. Cmd+V on local machine to verify clipboard content

Prerequisite

  • Enable "Applications in terminal may access clipboard" in iTerm2 Preferences → General → Selection
**Original Pull Request:** https://github.com/anomalyco/opencode/pull/7028 **State:** open **Merged:** No --- # Problem Clipboard copy operations (e.g., Ctrl+X Y to copy assistant message) silently fail when running opencode over SSH or in tmux on a remote Linux server without X11/Wayland display. **Root cause**: The fallback path uses clipboardy, which relies on xsel/xclip and requires a local display ($DISPLAY or $WAYLAND_DISPLAY). In headless SSH/tmux environments, these tools aren't available or don't work, causing clipboard operations to fail silently. # Solution Add OSC 52 escape sequence support as a fallback when clipboardy fails. [OSC 52](https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands) is a terminal escape sequence standard that allows applications to set the system clipboard through the terminal emulator. It's supported by: - iTerm2 - kitty - Alacritty - Windows Terminal - tmux (with set-clipboard option) - Many other modern terminal emulators # Changes - Added copyViaOSC52() function that sends OSC 52 escape sequences - Handles tmux passthrough wrapping when $TMUX is set - Modified fallback logic: try clipboardy first → fall back to OSC 52 on failure # Behavior | Environment | Before | After | |-------------|--------|-------| | macOS local | osascript ✅ | osascript ✅ (unchanged) | | Linux + X11/Wayland | xclip/xsel/wl-copy ✅ | xclip/xsel/wl-copy ✅ (unchanged) | | Windows | powershell ✅ | powershell ✅ (unchanged) | | SSH/tmux (no display) | clipboardy ❌ (silent fail) | clipboardy → OSC 52 ✅ | No breaking changes - existing behavior preserved for all native clipboard methods. # Testing 1. SSH into a remote Linux server 2. Run opencode in tmux with iTerm2 integration 3. Get a response from the assistant 4. Press Ctrl+X Y to copy the assistant's message 5. Cmd+V on local machine to verify clipboard content # Prerequisite * Enable "Applications in terminal may access clipboard" in iTerm2 Preferences → General → Selection
yindo added the pull-request label 2026-02-16 18:17:08 -05:00
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Reference: anomalyco/opencode#12213
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