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coder_code-server/PROJECT_BRIEF.md
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Project Brief: Code-Server Railway Template

Project: VSCode Cloud IDE with Claude Code Integration
Repository: sphinxcode/code-server
Railway Service: code-ajna (claude.sphinx.codes)
Status: In Progress

Executive Summary

Create a production-ready, marketable Railway template that provides browser-based VS Code (code-server) with pre-installed Claude Code CLI, persistent extensions, and configurable user permissions.

Original Problems

1. Root User Permission Issues

  • Symptom: code-server displayed security warnings about running as root
  • Cause: RAILWAY_RUN_UID=0 was set, forcing container to run as root
  • Impact: Couldn't bypass certain settings, security warnings in UI

2. Non-Persistent Tools

  • Symptom: npm, npx, extensions disappeared after redeployment
  • Cause: Container running as root with HOME=/root (ephemeral), while volume mounted at /home/coder
  • Impact: Users lost installed tools and configurations on each deploy

3. Claude Code Not Pre-installed

  • Request: Template users should have Claude Code CLI available out-of-the-box
  • Requirement: Support for claude --dangerously-skip-permissions flag

Solution Architecture

Infrastructure

Component Value
Base Image codercom/code-server:latest
Volume Mount /home/coder (Railway volume)
Service URL claude.sphinx.codes
Project ID 59ae99d7-dc99-4642-ae06-642cd8d8c83a
Service ID 34522d52-ba69-4fcf-83b7-210a765a0a76
Environment ID a921a831-e480-451b-b9c7-04ce2f647c68

Key Files Modified

Dockerfile

  • Installs gosu for proper user switching
  • Installs Node.js 20 LTS as fallback
  • Installs Claude Code CLI to /usr/local/bin/claude
  • Installs essential tools: ripgrep, jq, htop, vim, nano
  • Sets up XDG directories for persistence
  • PATH prioritizes volume paths over image paths

railway-entrypoint.sh

  • Configurable user via RUN_AS_USER variable
  • Shell profile setup (.bashrc, .profile) with PATH
  • Permission fixing via chown when switching users
  • User switching via gosu when RUN_AS_USER=coder
  • Root symlinks for persistence when staying as root
  • First-run initialization with welcome README
  • Environment verification logging

README.md

  • Documentation for all configuration variables
  • Quick start guide for Claude Code
  • Update behavior explanation
  • Troubleshooting guide

Configuration Variables

Variable Required Default Description
PASSWORD Yes - code-server login password
RUN_AS_USER No root Set to coder for non-root execution
CODER_HOME No /home/coder Volume mount path
CODER_UID No 1000 User ID when switching to coder
CODER_GID No 1000 Group ID when switching to coder
GIT_REPO No - Repository to auto-clone on startup

Persistence Strategy

Volume-First PATH Priority

$HOME/.local/bin          ← User-installed tools (Claude, etc.)
$HOME/.local/node/bin     ← User-installed Node.js
$HOME/.claude/local       ← Claude Code from volume
/usr/local/bin            ← Image fallback (Claude)
/usr/bin                  ← Image fallback (Node.js)

What Persists (on volume)

  • Extensions: ~/.local/share/code-server/extensions/
  • Claude Code: ~/.local/bin/claude or ~/.claude/
  • Claude auth: ~/.claude/ (API keys, settings)
  • Node.js: ~/.local/node/ (if user installs)
  • Shell config: ~/.bashrc, ~/.profile
  • Workspace: ~/workspace/

What Auto-Updates (from image)

  • Node.js fallback in /usr/bin/node
  • Claude Code fallback in /usr/local/bin/claude
  • System packages (git, curl, etc.)

User Modes

Root Mode (Default)

RUN_AS_USER=root (or not set)
  • Stays as root user
  • Creates symlinks from /root/ → /home/coder/ for persistence
  • Compatible with existing volumes owned by root

Coder Mode (Recommended for Claude)

RUN_AS_USER=coder
  • Switches to coder user (UID 1000) via gosu
  • Fixes volume permissions before switching
  • No root warnings in code-server UI
  • Required for claude --dangerously-skip-permissions

Issues Encountered & Resolved

1. Railway Start Command Override

  • Problem: Railway had a custom start command that bypassed our ENTRYPOINT
  • Solution: Cleared the start command via mcp_railway_service_update

2. Docker Layer Caching

  • Problem: Railway used cached layers, ignoring our changes
  • Solution: Added cache-bust comments to force rebuild

3. Claude Installs to ~/.local/bin

  • Problem: Assumed Claude installed to ~/.claude/local/
  • Solution: Updated PATH to include $HOME/.local/bin first

4. Shell Profile Not Configured

  • Problem: New terminals didn't have PATH set
  • Solution: Entrypoint now writes to .bashrc and .profile

Current Status

Completed ✅

  • Dockerfile with gosu, Node.js, Claude Code
  • Entrypoint with RUN_AS_USER variable
  • Shell profile auto-configuration
  • PATH priority for volume-installed tools
  • README documentation
  • Removed conflicting railway.json
  • Cleared Railway start command override
  • Set RUN_AS_USER=coder on Railway

Pending Verification 🔄

  • Confirm entrypoint output appears in Railway logs
  • Verify user switches to coder (not root@xxx)
  • Test claude --dangerously-skip-permissions works
  • Confirm Claude authentication persists

Expected Startup Logs

╔══════════════════════════════════════════════════════════════════════════╗
║           VSCode Cloud IDE - Claude Code & Node.js Ready            ║
╚══════════════════════════════════════════════════════════════════════════╝

→ Initial user: root (UID: 0)
→ RUN_AS_USER: coder
→ HOME: /home/coder

→ Running setup as root...
→ Setting up shell profile...
  ✓ Shell profile configured
→ Fixing permissions for coder user (UID: 1000)...
  ✓ Permissions fixed
→ Switching to coder user via gosu...

→ Running as: coder (UID: 1000)

Environment:
  → Node.js: v20.x.x [volume/image]
  → npm: x.x.x
  → git: x.x.x
  → claude: x.x.x [volume/image]

════════════════════════════════════════════════════════════════════════
Starting code-server as coder...
════════════════════════════════════════════════════════════════════════

Files Summary

File Location Purpose
Dockerfile sphinxcode/code-server Image build configuration
railway-entrypoint.sh sphinxcode/code-server Container startup script
README.md sphinxcode/code-server User documentation
railway.toml sphinxcode/code-server Railway deployment config

Next Steps

  1. Verify Deployment - Check if entrypoint runs and user switches properly
  2. Test Claude - Authenticate and run claude --dangerously-skip-permissions
  3. Create Railway Template - Make template public for others to deploy
  4. Update Template Docs - Include volume attachment instructions