#!/usr/bin/env bash
#-------------------------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
#-------------------------------------------------------------------------------------------------------------

# Syntax: ./common-debian.sh [install zsh flag] [username] [user UID] [user GID] [upgrade packages flag]

INSTALL_ZSH=${1:-"true"}
USERNAME=${2:-"vscode"}
USER_UID=${3:-1000}
USER_GID=${4:-1000}
UPGRADE_PACKAGES=${5:-"true"}

set -e

if [ "$(id -u)" -ne 0 ]; then
    echo -e 'Script must be run a root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
    exit 1
fi

# Treat a user name of "none" as root
if [ "${USERNAME}" = "none" ] || [ "${USERNAME}" = "root" ]; then
    USERNAME=root
    USER_UID=0
    USER_GID=0
fi

# Load markers to see which steps have already run
MARKER_FILE="/usr/local/etc/vscode-dev-containers/common"
if [ -f "${MARKER_FILE}" ]; then
    echo "Marker file found:"
    cat "${MARKER_FILE}"
    source "${MARKER_FILE}"
fi

# Ensure apt is in non-interactive to avoid prompts
export DEBIAN_FRONTEND=noninteractive

# Function to call apt-get if needed
apt-get-update-if-needed()
{
    if [ ! -d "/var/lib/apt/lists" ] || [ "$(ls /var/lib/apt/lists/ | wc -l)" = "0" ]; then
        echo "Running apt-get update..."
        apt-get update
    else
        echo "Skipping apt-get update."
    fi
}

# Run install apt-utils to avoid debconf warning then verify presence of other common developer tools and dependencies
if [ "${PACKAGES_ALREADY_INSTALLED}" != "true" ]; then
    apt-get-update-if-needed

    PACKAGE_LIST="apt-utils \
        git \
        openssh-client \
        less \
        iproute2 \
        procps \
        curl \
        wget \
        unzip \
        zip \
        nano \
        jq \
        lsb-release \
        ca-certificates \
        apt-transport-https \
        dialog \
        gnupg2 \
        libc6 \
        libgcc1 \
        libgssapi-krb5-2 \
        libicu[0-9][0-9] \
        liblttng-ust0 \
        libstdc++6 \
        zlib1g \
        locales \
        sudo"

    # Install libssl1.1 if available
    if [[ ! -z $(apt-cache --names-only search ^libssl1.1$) ]]; then
        PACKAGE_LIST="${PACKAGE_LIST}       libssl1.1"
    fi
    
    # Install appropriate version of libssl1.0.x if available
    LIBSSL=$(dpkg-query -f '${db:Status-Abbrev}\t${binary:Package}\n' -W 'libssl1\.0\.?' 2>&1 || echo '')
    if [ "$(echo "$LIBSSL" | grep -o 'libssl1\.0\.[0-9]:' | uniq | sort | wc -l)" -eq 0 ]; then
        if [[ ! -z $(apt-cache --names-only search ^libssl1.0.2$) ]]; then
            # Debian 9
            PACKAGE_LIST="${PACKAGE_LIST}       libssl1.0.2"
        elif [[ ! -z $(apt-cache --names-only search ^libssl1.0.0$) ]]; then
            # Ubuntu 18.04, 16.04, earlier
            PACKAGE_LIST="${PACKAGE_LIST}       libssl1.0.0"
        fi
    fi

    echo "Packages to verify are installed: ${PACKAGE_LIST}"
    apt-get -y install --no-install-recommends ${PACKAGE_LIST} 2> >( grep -v 'debconf: delaying package configuration, since apt-utils is not installed' >&2 )
        
    PACKAGES_ALREADY_INSTALLED="true"
fi

# Get to latest versions of all packages
if [ "${UPGRADE_PACKAGES}" = "true" ]; then
    apt-get-update-if-needed
    apt-get -y upgrade --no-install-recommends
    apt-get autoremove -y
fi

# Ensure at least the en_US.UTF-8 UTF-8 locale is available.
# Common need for both applications and things like the agnoster ZSH theme.
if [ "${LOCALE_ALREADY_SET}" != "true" ]; then
    echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen 
    locale-gen
    LOCALE_ALREADY_SET="true"
fi

# Create or update a non-root user to match UID/GID - see https://aka.ms/vscode-remote/containers/non-root-user.
if id -u $USERNAME > /dev/null 2>&1; then
    # User exists, update if needed
    if [ "$USER_GID" != "$(id -G $USERNAME)" ]; then 
        groupmod --gid $USER_GID $USERNAME 
        usermod --gid $USER_GID $USERNAME
    fi
    if [ "$USER_UID" != "$(id -u $USERNAME)" ]; then 
        usermod --uid $USER_UID $USERNAME
    fi
else
    # Create user
    groupadd --gid $USER_GID $USERNAME
    useradd -s /bin/bash --uid $USER_UID --gid $USER_GID -m $USERNAME
fi

# Add add sudo support for non-root user
if [ "${USERNAME}" != "root" ] && [ "${EXISTING_NON_ROOT_USER}" != "${USERNAME}" ]; then
    echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME
    chmod 0440 /etc/sudoers.d/$USERNAME
    EXISTING_NON_ROOT_USER="${USERNAME}"
fi

# .bashrc/.zshrc snippet
RC_SNIPPET="$(cat << EOF
export USER=\$(whoami)

export PATH=\$PATH:\$HOME/.local/bin

if [[ \$(which code-insiders 2>&1) && ! \$(which code 2>&1) ]]; then 
    alias code=code-insiders
fi
EOF
)"

# Ensure ~/.local/bin is in the PATH for root and non-root users for bash. (zsh is later)
if [ "${RC_SNIPPET_ALREADY_ADDED}" != "true" ]; then
    echo "${RC_SNIPPET}" | tee -a /root/.bashrc  >> /etc/skel/.bashrc 
    if [ "${USERNAME}" != "root" ]; then
        echo "${RC_SNIPPET}" >> /home/$USERNAME/.bashrc
        chown $USER_UID:$USER_GID /home/$USERNAME/.bashrc
    fi
    RC_SNIPPET_ALREADY_ADDED="true"
fi

# Optionally install and configure zsh
if [ "${INSTALL_ZSH}" = "true" ] && [ ! -d "/root/.oh-my-zsh" ] && [ "${ZSH_ALREADY_INSTALLED}" != "true" ]; then
    apt-get-update-if-needed
    apt-get install -y zsh
    curl -fsSLo- https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh | bash 2>&1
    echo -e "${RC_SNIPPET}\nDEFAULT_USER=\$USER\nprompt_context(){}" >> /root/.zshrc
    cp -fR /root/.oh-my-zsh /etc/skel
    cp -f /root/.zshrc /etc/skel
    sed -i -e "s/\/root\/.oh-my-zsh/\/home\/\$(whoami)\/.oh-my-zsh/g" /etc/skel/.zshrc
    if [ "${USERNAME}" != "root" ]; then
        cp -fR /etc/skel/.oh-my-zsh /etc/skel/.zshrc /home/$USERNAME
        chown -R $USER_UID:$USER_GID /home/$USERNAME/.oh-my-zsh /home/$USERNAME/.zshrc
    fi
    ZSH_ALREADY_INSTALLED="true"
fi

# Write marker file
mkdir -p "$(dirname "${MARKER_FILE}")"
echo -e "\
    PACKAGES_ALREADY_INSTALLED=${PACKAGES_ALREADY_INSTALLED}\n\
    LOCALE_ALREADY_SET=${LOCALE_ALREADY_SET}\n\
    EXISTING_NON_ROOT_USER=${EXISTING_NON_ROOT_USER}\n\
    RC_SNIPPET_ALREADY_ADDED=${RC_SNIPPET_ALREADY_ADDED}\n\
    ZSH_ALREADY_INSTALLED=${ZSH_ALREADY_INSTALLED}" > "${MARKER_FILE}"

echo "Done!"