Sessions not visible across platforms when syncing data directory (cross-platform session visibility) #10349

Description

When using Syncthing (or similar tools) to sync the OpenCode data directory (~/.local/share/opencode) across multiple platforms (Windows, macOS, Linux), sessions created on one platform are not visible on other platforms.

Root Cause

Sessions are filtered by the directory field in packages/opencode/src/server/routes/session.ts:

if (query.directory !== undefined && session.directory !== query.directory) continue

Sessions store the absolute path where they were created:

• Windows: C:\git\github\ercin\wow-dump
• macOS: /Users/ercin/projects/wow-dump
• Linux: /home/ubuntu/wow-dump

Since these paths don't match across platforms, sessions created on one platform are filtered out on others.

Steps to Reproduce

1. Set up Syncthing to sync ~/.local/share/opencode between Windows and macOS/Linux
2. Create a session on Windows in directory C:\git\github\project
3. Open OpenCode on macOS/Linux in the equivalent directory /Users/username/git/github/project
4. The Windows session is not visible in the session list

Expected Behavior

Sessions should be visible across platforms when syncing the data directory, especially for:

• Global sessions (not tied to a specific project)
• Sessions where the user explicitly wants cross-platform visibility

Proposed Solution

Add a configuration option like showAllSessions: true in opencode.json that bypasses the directory filtering:

const config = await Config.get()
if (!config.showAllSessions && query.directory !== undefined && session.directory !== query.directory) continue

Alternatively:

1. Normalize paths - Store relative paths or use a project identifier instead of absolute paths
2. Path mapping - Allow users to define path equivalences in config (e.g., C:\git ↔ /Users/x/git)
3. Show all global sessions - At minimum, make sessions in the global/ folder visible everywhere

Environment

• OpenCode version: 1.1.34
• Platforms: Windows 11, macOS, Ubuntu Linux
• Sync tool: Syncthing 2.0.13

Related Issues

• Windows Support #631 (Windows Support)
• TUI sends absolute local paths causing ENOENT on server side #4686 (TUI sends absolute local paths)