docker-tutorial

This repository is designed to provide a simple and effective way to run Valgrind, C, C++ code. If you're a 42 student, this repo is a must-have resource for you to check for memory leaks in your C/C++ code and perfecting your skills ;)

To create a Linux virtual environment with Docker on a Mac:

Install Docker via the Managed Software Center.
Clone the 42toolbox repository and run the init_docker.sh file which is provided in this repo too.
Check that Docker is running by checking the Docker icon in the top right corner. Note it may take some time.
Create a directory called "docker_image" and a Dockerfile within it.
In the Dockerfile, specify the instructions to build the Linux image by using the following:

# Sets the base image as the latest version of Arch Linux
FROM archlinux:latest    

# Updates the system's package databases and # Installing some packages (feel free to add packages that you need)
RUN pacman -Syy
RUN echo "Y" | pacman -Syu    
RUN echo "Y" | pacman -S gcc git make vim sudo gdb valgrind zsh glibc python3 python-pip unzip wget curl cmake

# Adds a new user "asioud" to the system and set a password for it
RUN useradd -m -G users -s /bin/bash asioud   
RUN echo "asioud:strongpwd" | chpasswd

# Grants administrative privileges to the "asioud" user
RUN echo 'asioud ALL=(ALL:ALL) ALL' | sudo EDITOR='tee -a' visudo   

# Installs Pygments and Norminette for the new user
RUN su - asioud -c "pip install --user pygments norminette"

# Sets the system time zone to Europe/Berlin by copying the time zone information to the /etc/localtime file.
RUN cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime 

# Sets the PATH environment variable to include the $HOME/.local/bin directory. (colour-valgrind doesn't work without it)
RUN echo "export PATH=$PATH:$HOME/.local/bin" >> ~/.zshrc

In the terminal, navigate to the home directory and run docker build -t arch:42 docker_image/ to build the Docker image.
Running the script to get inside the Linux container: Details are not provided in the original text.

#!/bin/bash

# Get the name of the script
me=`basename "$0"`

# Strip the path to the home directory from the current working directory
NEWVAR=${PWD#/Users/}

# Get the absolute path to the script
SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"

# Construct a variable for the home directory in the container
VAR="/home/${NEWVAR}"

# Check if an alias for the script exists in the .zshrc file
if grep -q "alias archlinux=" $HOME/.zshrc; then
    echo ""
else
	# If the alias doesn't exist, add it to the .zshrc file
	echo "alias archlinux=${SCRIPTPATH}/${me}" >> $HOME/.zshrc 
fi

# Run the Docker container
docker run -it \
  --dns 8.8.8.8 --dns 8.8.4.4 \
  --workdir=$VAR \
  -e "DEBUGINFOD_URLS=https://debuginfod.archlinux.org" \
  -e "OSTYPE=archlinux" \
  -e "SHELL=/bin/zsh" \
  -e "TERM=xterm-256color" \
  -e "HOSTNAME=archlinux" \
  --user=asioud \
  --privileged=true \
  --hostname=archlinux \
  -v $HOME:/home/asioud \
  arch:42

You are now logged in your docker Linux container and you've mounted the mac's home directory into the arch's linux home directory.

AzerSD/docker-tutorial

docker-tutorial