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#!/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.
#-------------------------------------------------------------------------------------------------------------
#
# Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/anaconda.md
# Maintainer: The VS Code and Codespaces Teams
#
# Syntax: ./anaconda-debian.sh [Conda version] [Non-root user] [Add rc files flag]

VERSION=${1:-"latest"}
USERNAME=${2:-"automatic"}
UPDATE_RC=${3:-"true"}

CONDA_DIR=${CONDA_DIR:-"/usr/local/conda"}

set -eux
export DEBIAN_FRONTEND=noninteractive

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

# Ensure that login shells get the correct path if the user updated the PATH using ENV.
rm -f /etc/profile.d/00-restore-env.sh
echo "export PATH=${PATH//$(sh -lc 'echo $PATH')/\$PATH}" > /etc/profile.d/00-restore-env.sh
chmod +x /etc/profile.d/00-restore-env.sh

# If in automatic mode, determine if a user already exists, if not use vscode
if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
    USERNAME=""
    POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
        if id -u ${CURRENT_USER} > /dev/null 2>&1; then
            USERNAME=${CURRENT_USER}
            break
        fi
    done
    if [ "${USERNAME}" = "" ]; then
        USERNAME=vscode
    fi
elif [ "${USERNAME}" = "none" ]; then
    USERNAME=root
    USER_UID=0
    USER_GID=0
fi

# Create or update a non-root user to match UID/GID.
group_name="${USERNAME}"
if id -u ${USERNAME} > /dev/null 2>&1; then
    # User exists, update if needed
    if [ "${USER_GID}" != "automatic" ] && [ "$USER_GID" != "$(id -g $USERNAME)" ]; then 
        group_name="$(id -gn $USERNAME)"
        groupmod --gid $USER_GID ${group_name}
        usermod --gid $USER_GID $USERNAME
    fi
    if [ "${USER_UID}" != "automatic" ] && [ "$USER_UID" != "$(id -u $USERNAME)" ]; then 
        usermod --uid $USER_UID $USERNAME
    fi
else
    # Create user
    if [ "${USER_GID}" = "automatic" ]; then
        groupadd $USERNAME
    else
        groupadd --gid $USER_GID $USERNAME
    fi
    if [ "${USER_UID}" = "automatic" ]; then 
        useradd -s /bin/bash --gid $USERNAME -m $USERNAME
    else
        useradd -s /bin/bash --uid $USER_UID --gid $USERNAME -m $USERNAME
    fi
fi

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

architecture="$(uname -m)"
if [ "${architecture}" != "x86_64" ]; then
    echo "(!) Architecture $architecture unsupported"
    exit 1
fi

updaterc() {
    if [ "${UPDATE_RC}" = "true" ]; then
        echo "Updating /etc/bash.bashrc and /etc/zsh/zshrc..."
        if [[ "$(cat /etc/bash.bashrc)" != *"$1"* ]]; then
            echo -e "$1" >> /etc/bash.bashrc
        fi
        if [ -f "/etc/zsh/zshrc" ] && [[ "$(cat /etc/zsh/zshrc)" != *"$1"* ]]; then
            echo -e "$1" >> /etc/zsh/zshrc
        fi
    fi
}

# Checks if packages are installed and installs them if not
check_packages() {
    if ! dpkg -s "$@" > /dev/null 2>&1; then
        apt-get update
        apt-get -y install --no-install-recommends "$@"
    fi
}

# Install Conda if it's missing
if ! conda --version &> /dev/null ; then
    # Install dependencies
    check_packages wget ca-certificates

    mkdir -p $CONDA_DIR
    chown ${USERNAME}:${USERNAME} $CONDA_DIR
    echo "Installing Anaconda..."

    CONDA_VERSION=$VERSION
    if [ "${VERSION}" = "latest" ] || [ "${VERSION}" = "lts" ]; then
        CONDA_VERSION="2021.11"
    fi

    su --login -c "wget -q https://repo.anaconda.com/archive/Anaconda3-${CONDA_VERSION}-Linux-x86_64.sh -O /tmp/anaconda-install.sh \
        && /bin/bash /tmp/anaconda-install.sh -u -b -p ${CONDA_DIR}" ${USERNAME} 2>&1 
    
    if [ "${VERSION}" = "latest" ] || [ "${VERSION}" = "lts" ]; then
        PATH=$PATH:${CONDA_DIR}/bin
        conda update -y conda
    fi

    rm /tmp/anaconda-install.sh 
    updaterc "export CONDA_DIR=${CONDA_DIR}/bin"
fi

echo "Done!"