# nix
學一下cicd常用的套件
https://github.com/x213212/nix-project-test
最近也用chatgpt 用rust 寫了一套 build-system
應該可以搭配服用
https://github.com/x213212/minibuildsystem

# install

1. Installing and Configuring Nix
Install Nix on WSL and Set Up Multi-User Configuration:
# Download the Nix installation script
curl -L https://nixos.org/nix/install | sh
# After installation, create the `nixbld` group
sudo groupadd nixbld
# Create 10 users and add them to the `nixbld` group
for i in $(seq 1 10); do sudo useradd -m nixbld$i -g nixbld; done

# usage

nix-build # build add
nix-build -A appA

# backup

 ls /nix/store | grep appA

# dep
drv 會記錄 build 該 nix project 所有 dep lib

nix log /nix/store/085svyj39q9mg9gkq9vbpyby51s7az5a-appA.drv --extra-experimental-features nix-commandnix log /nix/store/085svyj39q9mg9gkq9vbpyby51s7az5a-appA.drv --extra-experimental-features nix-command

# garbagenix-collectgarbagenix-collect

nix-collect-garbagenix-collect-garbage

最後補一個自動化出dep 的 python

import os
import re
import subprocess

# Define target directory and output files
TARGET_DIR = "/root/nix-project"
DOT_FILE = "dependencies.dot"
OUTPUT_IMAGE = "dependencies.png"

# Initialize DOT file content
dot_content = ["digraph dependencies {"]

# Traverse the directory to find .nix files
for root, _, files in os.walk(TARGET_DIR):
    for file in files:
        if file.endswith(".nix"):
            nix_path = os.path.join(root, file)
            
            # Read the .nix file content
            with open(nix_path, 'r') as f:
                content = f.read()

                # Extract the "name" attribute
                name_match = re.search(r'name\s*=\s*"([^"]+)"', content)
                if name_match:
                    name = name_match.group(1)
                    
                    # Extract "buildInputs" dependencies
                    build_inputs_match = re.search(r'buildInputs\s*=\s*\[(.*?)\];', content, re.DOTALL)
                    if build_inputs_match:
                        dependencies = build_inputs_match.group(1)
                        # Add each dependency to the DOT file content
                        for dep in dependencies.split():
                            dep = dep.strip()
                            if dep:  # Check if dependency is not empty
                                dot_content.append(f'  "{name}" -> "{dep}";')

# Finalize DOT file content
dot_content.append("}")

# Write content to the .dot file
with open(DOT_FILE, 'w') as f:
    f.write("\n".join(dot_content))

# Use Graphviz to generate the dependency image
subprocess.run(["dot", "-Tpng", DOT_FILE, "-o", OUTPUT_IMAGE])

print(f"Dependency graph generated: {OUTPUT_IMAGE}")
import os
import re
import subprocess

# Define target directory and output files
TARGET_DIR = "/root/nix-project"
DOT_FILE = "dependencies.dot"
OUTPUT_IMAGE = "dependencies.png"

# Initialize DOT file content
dot_content = ["digraph dependencies {"]

# Traverse the directory to find .nix files
for root, _, files in os.walk(TARGET_DIR):
    for file in files:
        if file.endswith(".nix"):
            nix_path = os.path.join(root, file)
            
            # Read the .nix file content
            with open(nix_path, 'r') as f:
                content = f.read()

                # Extract the "name" attribute
                name_match = re.search(r'name\s*=\s*"([^"]+)"', content)
                if name_match:
                    name = name_match.group(1)
                    
                    # Extract "buildInputs" dependencies
                    build_inputs_match = re.search(r'buildInputs\s*=\s*\[(.*?)\];', content, re.DOTALL)
                    if build_inputs_match:
                        dependencies = build_inputs_match.group(1)
                        # Add each dependency to the DOT file content
                        for dep in dependencies.split():
                            dep = dep.strip()
                            if dep:  # Check if dependency is not empty
                                dot_content.append(f'  "{name}" -> "{dep}";')

# Finalize DOT file content
dot_content.append("}")

# Write content to the .dot file
with open(DOT_FILE, 'w') as f:
    f.write("\n".join(dot_content))

# Use Graphviz to generate the dependency image
subprocess.run(["dot", "-Tpng", DOT_FILE, "-o", OUTPUT_IMAGE])

print(f"Dependency graph generated: {OUTPUT_IMAGE}")