install.sh

#!/usr/bin/env bash

# Adapted from https://github.com/devcontainers/features/blob/9e75db9a1dbcc245f94707c0917470143c17595b/src/ruby/install.sh

RUBY_VERSION="${VERSION:-"latest"}"

USERNAME="${USERNAME:-"${_REMOTE_USER:-"automatic"}"}"
UPDATE_RC="${UPDATE_RC:-"true"}"

set -ex

# Clean up
rm -rf /var/lib/apt/lists/*

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

# Determine the appropriate non-root user
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 [ "${USERNAME}" = "" ]; then
        USERNAME=root
    fi
elif [ "${USERNAME}" = "none" ] || ! id -u ${USERNAME} > /dev/null 2>&1; then
    USERNAME=root
fi

updaterc() {
    if [ "${UPDATE_RC}" = "true" ]; then
        echo "Updating /etc/bash.bashrc and /etc/zsh/zshrc..."
        eval "$(/usr/local/share/rbenv/bin/rbenv init - bash)" >> /etc/bash.bashrc
        eval "$(/usr/local/share/rbenv/bin/rbenv init - zsh)" >> /etc/zsh/zshrc
    fi
}

# Figure out correct version of a three part version number is not passed
find_version_from_git_tags() {
    local variable_name=$1
    local requested_version=${!variable_name}
    if [ "${requested_version}" = "none" ]; then return; fi
    local repository=$2
    local prefix=${3:-"tags/v"}
    local separator=${4:-"."}
    local last_part_optional=${5:-"false"}
    if [ "$(echo "${requested_version}" | grep -o "." | wc -l)" != "2" ]; then
        local escaped_separator=${separator//./\\.}
        local last_part
        if [ "${last_part_optional}" = "true" ]; then
            last_part="(${escaped_separator}[0-9]+)?"
        else
            last_part="${escaped_separator}[0-9]+"
        fi
        local regex="${prefix}\\K[0-9]+${escaped_separator}[0-9]+${last_part}$"
        local version_list="$(git ls-remote --tags ${repository} | grep -oP "${regex}" | tr -d ' ' | tr "${separator}" "." | sort -rV)"
        if [ "${requested_version}" = "latest" ] || [ "${requested_version}" = "current" ] || [ "${requested_version}" = "lts" ]; then
            declare -g ${variable_name}="$(echo "${version_list}" | head -n 1)"
        else
            set +e
            declare -g ${variable_name}="$(echo "${version_list}" | grep -E -m 1 "^${requested_version//./\\.}([\\.\\s]|$)")"
            set -e
        fi
    fi
    if [ -z "${!variable_name}" ] || ! echo "${version_list}" | grep "^${!variable_name//./\\.}$" > /dev/null 2>&1; then
        echo -e "Invalid ${variable_name} value: ${requested_version}\nValid values:\n${version_list}" >&2
        exit 1
    fi
    echo "${variable_name}=${!variable_name}"
}

apt_get_update()
{
    if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
        echo "Running apt-get update..."
        apt-get update -y
    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
}

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

architecture="$(uname -m)"
if [ "${architecture}" != "amd64" ] && [ "${architecture}" != "x86_64" ] && [ "${architecture}" != "arm64" ] && [ "${architecture}" != "aarch64" ]; then
    echo "Architecture $architecture unsupported"
    exit 1
fi

# Install dependencies
check_packages curl ca-certificates software-properties-common build-essential gnupg2 libreadline-dev \
    procps dirmngr gawk autoconf automake bison libffi-dev libgdbm-dev libncurses5-dev \
    libsqlite3-dev libtool libyaml-dev pkg-config sqlite3 zlib1g-dev libgmp-dev libssl-dev
if ! type git > /dev/null 2>&1; then
    check_packages git
fi

if [[ ! -d "/usr/local/share/rbenv" ]]; then
    git clone --depth=1 \
        -c core.eol=lf \
        -c core.autocrlf=false \
        -c fsck.zeroPaddedFilemode=ignore \
        -c fetch.fsck.zeroPaddedFilemode=ignore \
        -c receive.fsck.zeroPaddedFilemode=ignore \
        https://github.com/rbenv/rbenv.git /usr/local/share/rbenv
fi

if [[ ! -d "/usr/local/share/ruby-build" ]]; then
    git clone --depth=1 \
        -c core.eol=lf \
        -c core.autocrlf=false \
        -c fsck.zeroPaddedFilemode=ignore \
        -c fetch.fsck.zeroPaddedFilemode=ignore \
        -c receive.fsck.zeroPaddedFilemode=ignore \
        https://github.com/rbenv/ruby-build.git /usr/local/share/ruby-build
    mkdir -p /root/.rbenv/plugins

    ln -s /usr/local/share/ruby-build /root/.rbenv/plugins/ruby-build
fi

if [ "${USERNAME}" != "root" ]; then
    mkdir -p /home/${USERNAME}/.rbenv/plugins

    if [[ ! -d "/home/${USERNAME}/.rbenv/plugins/ruby-build" ]]; then
        ln -s /usr/local/share/ruby-build /home/${USERNAME}/.rbenv/plugins/ruby-build
    fi

    chmod -R g+r+w "/home/${USERNAME}/.rbenv"
    find "/home/${USERNAME}/.rbenv" -type d | xargs -n 1 chmod g+s
fi

updaterc

eval "$(/usr/local/share/rbenv/bin/rbenv init - bash)"

# Figure out correct version of a three part version number is not passed
find_version_from_git_tags RUBY_VERSION "https://github.com/ruby/ruby" "tags/v" "_"
rbenv install ${RUBY_VERSION}
rbenv global ${RUBY_VERSION}