shell 技巧： 1. exec 一个shell func: export -f func_name; exec bash -c “func_name” 2. 判断命令输出是否为空 if [[ -n $(docker ps -f name=test)]]; 3. 判断命令的返回码是否为0（即是否正确执行exit 0） if docker ps ;

check_container

#!/bin/sh

ulimit -n 65536
exec 2>&1

create_container () {
    echo 'try to create container'
    sudo docker create --name 'gentoo_with_portage' \
            -v /usr/portage/ \
            -v /var/lib/layman/ \
            -v /var/cache/edb/ \
            -v /etc/portage/package.keywords/ \
            -v /etc/portage/package.mask/ \
            -v /etc/portage/package.unmask/ \
            docker-registry.intra.douban.com/gentoo_with_portage:latest true
    echo 'finish create container'
}

check_container () {
    while true; do
        if [[ -n $(sudo docker ps -q -a -f name='gentoo_with_portage') ]]  ; then
            echo 'container exists, continue...'
            sleep 5
        else
            echo 'no gentoo_with_portage container, will exit'