wsl.sh

echo 'Updating ubuntu packages information...'
sudo apt-get update > /dev/null
sudo apt-get remove -yqq --ignore-missing cmdtest nodejs yarn jq  > /dev/null
echo 'Upgrading ubuntu packages...'
sudo DEBIAN_FRONTEND=noninteractive apt-get dist-upgrade -yqq  > /dev/null
echo 'Installing packages...'
sudo apt-get install -yqq daemonize dbus-user-session git zip unzip wget curl jq build-essential apt-transport-https ca-certificates gnupg-agent software-properties-common > /dev/null

echo 'Configuring systemd...'
cat <<- "EOF" | sudo tee /usr/sbin/start-systemd-namespace > /dev/null
#!/bin/bash

SYSTEMD_PID=$(ps -ef | grep '/lib/systemd/systemd --system-unit=basic.target$' | grep -v unshare | awk '{print $2}')
if [ -z "$SYSTEMD_PID" ] || [ "$SYSTEMD_PID" != "1" ]; then
    export PRE_NAMESPACE_PATH="$PATH"
    (set -o posix; set) | \
        grep -v "^BASH" | \
        grep -v "^DIRSTACK=" | \
        grep -v "^EUID=" | \
        grep -v "^GROUPS=" | \
        grep -v "^HOME=" | \
        grep -v "^HOSTNAME=" | \
        grep -v "^HOSTTYPE=" | \
        grep -v "^IFS='.*"$'\n'"'" | \
        grep -v "^LANG=" | \
        grep -v "^LOGNAME=" | \
        grep -v "^MACHTYPE=" | \
        grep -v "^NAME=" | \
        grep -v "^OPTERR=" | \
        grep -v "^OPTIND=" | \
        grep -v "^OSTYPE=" | \
        grep -v "^PIPESTATUS=" | \
        grep -v "^POSIXLY_CORRECT=" | \
        grep -v "^PPID=" | \
        grep -v "^PS1=" | \
        grep -v "^PS4=" | \
        grep -v "^SHELL=" | \
        grep -v "^SHELLOPTS=" | \
        grep -v "^SHLVL=" | \
        grep -v "^SYSTEMD_PID=" | \
        grep -v "^UID=" | \
        grep -v "^USER=" | \
        grep -v "^_=" | \
        cat - > "$HOME/.systemd-env"
    echo "PATH='$PATH'" >> "$HOME/.systemd-env"
    exec sudo /usr/sbin/enter-systemd-namespace "$BASH_EXECUTION_STRING"
fi
if [ -n "$PRE_NAMESPACE_PATH" ]; then
    export PATH="$PRE_NAMESPACE_PATH"
fi
EOF
sudo chmod +x /usr/sbin/start-systemd-namespace

cat <<- "EOF" | sudo tee /usr/sbin/enter-systemd-namespace > /dev/null
#!/bin/bash

if [ "$UID" != 0 ]; then
    echo "You need to run $0 through sudo"
    exit 1
fi

SYSTEMD_PID="$(ps -ef | grep '/lib/systemd/systemd --system-unit=basic.target$' | grep -v unshare | awk '{print $2}')"
if [ -z "$SYSTEMD_PID" ]; then
    while [ -z "$SYSTEMD_PID" ]; do
        SYSTEMD_PID="$(ps -ef | grep '/lib/systemd/systemd --system-unit=basic.target$' | grep -v unshare | awk '{print $2}')"
    done
fi

if [ -n "$SYSTEMD_PID" ] && [ "$SYSTEMD_PID" != "1" ]; then
    if [ -n "$1" ] && [ "$1" != "bash --login" ] && [ "$1" != "/bin/bash --login" ]; then
        exec /usr/bin/nsenter -t "$SYSTEMD_PID" -a \
            /usr/bin/sudo -H -u "$SUDO_USER" \
            /bin/bash -c 'set -a; source "$HOME/.systemd-env"; set +a; exec bash -c '"$(printf "%q" "$@")"
    else
        exec /usr/bin/nsenter -t "$SYSTEMD_PID" -a \
            /bin/login -p -f "$SUDO_USER" \
            $(/bin/cat "$HOME/.systemd-env" | grep -v "^PATH=")
    fi
    echo "Existential crisis"
fi
EOF
sudo sed -i 9a"$(which daemonize) /usr/bin/unshare --fork --pid --mount-proc /lib/systemd/systemd --system-unit=basic.target" /usr/sbin/enter-systemd-namespace
sudo chmod +x /usr/sbin/enter-systemd-namespace

echo 'Adding sudoers...'

cat <<- "EOF" | sudo tee /etc/sudoers.d/wsl > /dev/null
Defaults        env_keep += WSLPATH
Defaults        env_keep += WSLENV
Defaults        env_keep += WSL_INTEROP
Defaults        env_keep += WSL_DISTRO_NAME
Defaults        env_keep += PRE_NAMESPACE_PATH
%sudo ALL=(ALL) NOPASSWD: /usr/sbin/enter-systemd-namespace
EOF

echo 'Setting autostart...'

sudo sed -i 2a"# Start or enter a PID namespace in WSL2\nsource /usr/sbin/start-systemd-namespace\n" /etc/bash.bashrc
sudo touch /root/.systemd-env

echo "alias open='explorer.exe'" >> ~/.bashrc
echo 'DONE!'