pre.sh

#!/bin/bash
# Set the mirror addr, host_name and logining without secret between nodes.

_get_distribution() {
    local lsb_dist=
    if [[ -r /etc/os-release ]]; then
        # shellcheck source=/dev/null
        lsb_dist="$(. /etc/os-release && echo "$ID")"
    fi

    # perform some very rudimentary platform detection
    lsb_dist="$(echo "$lsb_dist" | tr '[:upper:]' '[:lower:]')"

    # Returning an empty string here should be alright since the
    # case statements don't act unless you provide an actual value
    echo "$lsb_dist"
}

function set_yum() {
    if [[ -z ${YUM_URL} ]]; then
        YUM_URL="http://mirrors.aliyun.com"
    fi
    local dist
    dist=$(_get_distribution)
    case "${dist}" in
    centos)
        # https://stackoverflow.com/questions/6363441/check-if-a-file-exists-with-a-wildcard-in-a-shell-script
        # if [[ $(compgen -G "/etc/yum.repos.d/CentOS-*.repo.bak") ]]; then
        if compgen -G "/etc/yum.repos.d/CentOS-*.repo.bak"; then
            rm -f /etc/yum.repos.d/CentOS-*.repo
            rename '.bak' '' /etc/yum.repos.d/CentOS-*.bak
        else
            sed -e 's|^mirrorlist=|#mirrorlist=|g' \
                -e "s|^#baseurl=http://mirror.centos.org|baseurl=${YUM_URL}|g" \
                -i.bak \
                /etc/yum.repos.d/CentOS-*.repo
            yum makecache
        fi
        ;;
    *)
        logger error "Unsupported distribution '$dist'"
        exit 1
        ;;
    esac
}

function set_docker() {
    :
}

function pre_main() {
    logger info "$(beauty "set yum and docker repo" 60)"
    # shellcheck source=/dev/null
    . ./core/core.sh
    set_yum
    set_docker

    logger info "$(beauty "set  no password login around members." 60)"
    yum install net-tools -y
    # shellcheck disable=SC2091
    if isMaster; then
        copy_id
        set_host_name
    fi
}

# Invoke main with args if not sourced
# Approach via: https://stackoverflow.com/a/28776166/8787985
if ! (return 0 2>/dev/null); then
    logger error "Must run this shell in current process."
fi