nix-config/AGENTS.md

AGENTS.md - Arch Linux Configuration Repository

Project Overview

This is a declarative Arch Linux configuration repository managed by decman (Declarative package & configuration manager for Arch Linux). The project uses a Python source file to declare packages, system files, and dotfiles.

Primary Tool: decman - Declarative package & configuration manager for Arch Linux Target Environment: Arch Linux (primarily WSL, but supports bare metal) Language: Shell scripts (Bash), Python configuration (source.py)

Repository Structure

.
├── source.py         # decman main configuration (packages, system files, dotfiles)
├── system/           # System configuration files to deploy
│   └── etc/
│       ├── pacman.d/mirrorlist
│       └── sudoers.d/10-wheel
├── home/             # User configuration files to deploy
│   └── .zshrc
└── scripts/
    ├── install.sh    # Bootstrap script (git → yay → decman → first sync)
    └── wsl-init.sh   # WSL-specific initialization (user creation)

Build/Test/Sync Commands

Primary Commands

# Apply configuration (install/update packages, sync files)
sudo decman

# First-time run (specify source file)
sudo decman --source ~/.config/arch-config/source.py

# Skip specific plugins
sudo decman --skip aur
sudo decman --skip flatpak

# Only apply file operations
sudo decman --no-hooks --only files

# Debug mode
sudo decman --debug

Installation Commands

# WSL first-time setup (as root)
curl -fsSL https://git.furtherverse.com/imbytecat/archlinux-config/raw/branch/main/scripts/wsl-init.sh | bash -s -- <username>

# Install decman and apply config (as regular user)
curl -fsSL https://git.furtherverse.com/imbytecat/archlinux-config/raw/branch/main/scripts/install.sh | bash

Testing Scripts

# Test shell scripts for syntax errors
bash -n scripts/install.sh
bash -n scripts/wsl-init.sh

# Run shellcheck if available
shellcheck scripts/*.sh

# Validate Python syntax
python -c "import py_compile; py_compile.compile('source.py', doraise=True)"

Code Style Guidelines

Shell Scripts

Shebang & Options:

• Always use #!/bin/bash (not #!/bin/sh)
• Start with set -euo pipefail for safety

Error Handling:

• Check command success with if ! command; then
• Validate user input before proceeding
• Provide clear error messages in Chinese (matching project language)
• Exit with non-zero status on errors

Variables:

• Use UPPERCASE for constants and environment variables
• Use lowercase for local variables
• Always quote variables: "$VAR" not $VAR

Conditionals:

• Prefer [[ ]] over [ ] for tests
• Use &> /dev/null for suppressing output
• Check command existence: if command -v cmd &> /dev/null; then

User Feedback:

• Use echo "==> Action..." for major steps
• Use Chinese for user-facing messages
• Show clear success indicators: ✓

Example Pattern:

#!/bin/bash
set -euo pipefail

USERNAME="${1:-}"
if [ -z "$USERNAME" ]; then
    echo "用法: script.sh <参数>"
    exit 1
fi

echo "==> 执行操作..."
if ! some_command; then
    echo "错误：操作失败"
    exit 1
fi

echo "✓ 完成！"

Python Configuration (source.py)

Structure:

• Use section dividers (# ── Section ──) to separate logical groups
• Group packages by purpose (基础工具, 开发工具, Zsh)
• Keep packages in sets (|= syntax)
• Use os.environ.get("SUDO_USER") for dynamic username

Example Pattern:

import os
import decman
from decman import File

USERNAME = os.environ.get("SUDO_USER", "imbytecat")
HOME = f"/home/{USERNAME}"

decman.pacman.packages |= {"git", "neovim", "zsh"}
decman.aur.packages |= {"decman", "bun"}

decman.files["/etc/pacman.d/mirrorlist"] = File(
    source_file="./system/etc/pacman.d/mirrorlist",
)

decman.files[f"{HOME}/.zshrc"] = File(
    source_file="./home/.zshrc",
    owner=USERNAME,
)

Git Workflow

Commit Messages:

• Follow commitlint conventional commits format
• Use Chinese for commit messages (matching project language)
• Format: <type>(<scope>): <subject>
• Types: feat, fix, docs, style, refactor, test, chore
• Examples:
  • feat(source): 添加开发工具包
  • fix(scripts): 更新安装脚本
  • docs: 更新 README 说明
  • chore(files): 更新镜像源列表

Branching:

• Main branch: main
• Work directly on main for personal config repos

Important Notes for Agents

1. decman is the source of truth: Don't manually install packages. Add them to source.py and run sudo decman.

2. Pacman vs AUR: Packages must be correctly categorized into decman.pacman.packages (official repos) and decman.aur.packages (AUR).

3. System files: Files in system/ are copied (not symlinked) to system locations by decman. Use File(source_file=..., permissions=...) with correct permissions.

4. User config: Files in home/ are copied to user home by decman. Use File(source_file=..., owner=USERNAME).

5. No dry-run: decman does not have a --dry-run option. Review changes in source.py before running sudo decman.

6. Runs as root: sudo decman executes source.py as root. SUDO_USER contains the original username.

7. Language: User-facing messages and documentation are in Chinese. Keep this consistent.

8. Safety first: Scripts use set -euo pipefail and validate inputs.

9. Idempotency: Scripts should be safe to run multiple times.

10. Bootstrap flow: scripts/install.sh handles one-time setup (yay, decman, locale-gen, chsh). After that, sudo decman handles ongoing management.

Common Tasks

Add a new package:

• Determine if it's pacman or AUR
• Add to the appropriate set in source.py
• Run sudo decman

Add a new system file:

• Place the file in system/ matching target path structure (e.g., system/etc/foo.conf → /etc/foo.conf)
• Add decman.files["/etc/foo.conf"] = File(source_file="./system/etc/foo.conf") to source.py
• Run sudo decman

Add a new dotfile:

• Place the file in home/
• Add decman.files[f"{HOME}/.config/foo"] = File(source_file="./home/foo", owner=USERNAME) to source.py
• Run sudo decman

Update an existing configuration file:

• Edit the source file in system/ or home/
• Run sudo decman