curl -fsSL https://repo.pigsty.io/get | bash; cd ~/pigsty;

./bootstrap; ./configure; ./install.yml; # 准备依赖，生成配置，安装 Pigsty 三步走！

./bootstrap   # 使用各种可选方式安装 Ansible 与 Jmespath 依赖，如果离线包存在则使用离线包

curl -fsSL https://repo.pigsty.cc/get | bash            # 安装最新稳定版本 
curl -fsSL https://repo.pigsty.cc/get | bash -s v3.0.4  # 安装特定版本 3.0.1

git clone https://github.com/Vonng/pigsty; cd pigsty; git checkout v3.0.4

./configure # 不带参数会自动推荐配置，并交互式问询
./configure [-i|--ip <ipaddr>]                     # 指定首要 IP 地址，如果不指定，将在检测到多个可用IP地址时问询。
            [-c|--conf <conf>]                     # 指定配置模板（相对于 conf/ 目录的配置名称），不指定将根据操作系统自动选择 
            [-r|--region <default|china|europe>]   # 选择镜像源区域，如果在 GFW 区域内，将被设置为 china
            [-n|--non-interactive]                 # 跳过交互式向导
            [-x|--proxy]                           # 将环境变量中的代理配置写入配置文件的 proxy_env 参数中

./install.yml    # 一次性在所有节点上完成安装

bin/node-add   pg-test      # 将集群 pg-test 的3个节点纳入 Pigsty 管理
bin/pgsql-add  pg-test      # 初始化一个3节点的 pg-test 高可用PG集群
bin/redis-add  redis-ms     # 初始化 Redis 集群： redis-ms

./cache.yml -l infra  

./cache.yml -l infra -e '{"cache_pkg_dir":"files","cache_pkg_name":"pkg.tgz"}'

sudo rm -rf /www/pigsty ； sudo tar -xf /tmp/pkg.tgz -C /www 

./bootstrap       # 确保 ansible 正确安装（如果有离线包，优先使用离线安装并解包使用）

./boostrap
   [-r|--region <region]   [default,china,europe]
   [-p|--path <path>]      specify another offline pkg path
   [-k|--keep]             keep existing upstream repo during bootstrap

all:
  children:
    infra: { hosts: { 10.10.10.10: { infra_seq: 1 } }, vars: { docker_enabled: true } }

    etcd:
      hosts:
        10.10.10.10: { etcd_seq:  1 }
        #10.10.10.11: { etcd_seq:  2 } # optional
        #10.10.10.12: { etcd_seq:  3 } # optional
      vars: { etcd_cluster: etcd }

    pg-meta:
      hosts:
        10.10.10.10: { pg_seq: 1, pg_role: primary }  # init one single-node pgsql cluster by default, with:
        #10.10.10.11: { pg_seq: 2, pg_role: replica } # optional replica : bin/pgsql-add pg-meta 10.10.10.11
        #10.10.10.12: { pg_seq: 3, pg_role: replica } # optional replica : bin/pgsql-add pg-meta 10.10.10.12
      vars:
        pg_cluster: pg-meta
        pg_users:         # define business users here: https://pigsty.io/docs/pgsql/user/
          - { name: dbuser_meta ,password: DBUser.Meta ,pgbouncer: true ,roles: [ dbrole_admin ] ,comment: pigsty default user }
        pg_databases:     # define business databases here: https://pigsty.io/docs/pgsql/db/
          - { name: meta ,comment: pigsty default database  }
        pg_hba_rules:     # define HBA rules here: https://pigsty.io/docs/pgsql/hba/#define-hba
          - { user: dbuser_meta , db: all ,addr: world ,auth: pwd ,title: 'allow default user world access with password (not a good idea!)' }
        node_crontab:     # define backup policy with crontab (full|diff|incr)
          - '00 01 * * * postgres /pg/bin/pg-backup full'
        #pg_vip_address: 10.10.10.2/24  # optional l2 vip address and netmask
        pg_extensions:    # define pg extensions (345 available): https://pigsty.io/docs/pgext/
          - postgis timescaledb pgvector

  vars:
    version: v3.0.4                   # pigsty version string
    admin_ip: 10.10.10.10             # admin node ip address
    region: default                   # upstream mirror region: default|china|europe
    node_tune: tiny                   # use tiny template for NODE  in demo environment
    pg_conf: tiny.yml                 # use tiny template for PGSQL in demo environment

    # minimal installation setup
    node_repo_modules: node,infra,pgsql
    nginx_enabled: false
    dns_enabled: false
    prometheus_enabled: false
    grafana_enabled: false
    pg_exporter_enabled: false
    pgbouncer_exporter_enabled: false
    pg_vip_enabled: false

./slim.yml

all:                  # 顶层对象：all
  vars: {...}         # 全局参数
  children:           # 组定义
    infra:            # 组定义：'infra'
      hosts: {...}        # 组成员：'infra'
      vars:  {...}        # 组参数：'infra'
    etcd:    {...}    # 组定义：'etcd'
    pg-meta: {...}    # 组定义：'pg-meta'
    pg-test: {...}    # 组定义：'pg-test'
    redis-test: {...} # 组定义：'redis-test'
    # ...

pg-test:   # 集群名称
  vars:    # 集群参数
    pg_cluster: pg-test
  hosts:   # 集群成员
    10.10.10.11: { pg_seq: 1, pg_role: primary } # 实例1，在 10.10.10.11 上，主库
    10.10.10.12: { pg_seq: 2, pg_role: replica } # 实例2，在 10.10.10.12 上，从库
    10.10.10.13: { pg_seq: 3, pg_role: offline } # 实例3，在 10.10.10.13 上，从库

命令行参数 > 剧本变量  >  主机变量（实例参数）  >  组变量（集群参数）  >  全局变量（全局参数） >  默认值

./node.yml -i files/pigsty/rpmbuild.yml    # 根据 rpmbuild 配置文件，初始化目标节点，而不是使用默认的 pigsty.yml 配置文件

nodes:    
  hosts:  # 10.10.10.10 无法直接 ssh，但可以通过ssh别名 `meta` 访问
    10.10.10.10: { ansible_host: meta }

ssh <ip|alias> 'sudo ls'

curl -fsSL https://repo.pigsty.cc/get | bash

  playbook  / command / group         infra           nodes    etcd     minio     pgsql
[infra.yml] ./infra.yml [-l infra]   [+infra][+node] 
[node.yml]  ./node.yml                               [+node]  [+node]  [+node]   [+node]
[etcd.yml]  ./etcd.yml  [-l etcd ]                            [+etcd]
[minio.yml] ./minio.yml [-l minio]                                     [+minio]
[pgsql.yml] ./pgsql.yml                                                          [+pgsql]

./node.yml -i files/pigsty/rpmbuild.yml    # 根据 rpmbuild 配置文件，初始化目标节点，而不是使用默认的 pigsty.yml 配置文件
./pgsql.yml -i files/pigsty/rpm.yml        # 根据 files/pigsty/rpm.yml 配置文件中的定义，在目标节点上安装 pgsql 模块
./redis.yml -i files/pigsty/redis.yml      # 根据 files/pigsty/redis.yml 配置文件中的定义，在目标节点上安装 redis 模块

./pgsql.yml                              # 在所有主机上运行（非常危险！）
./pgsql.yml   -l pg-test                 # 在 pg-test 集群上运行
./pgsql.yml   -l 10.10.10.10             # 在单个主机 10.10.10.10 上运行
./pgsql.yml   -l pg-*                    # 在与通配符 `pg-*` 匹配的主机/组上运行
./pgsql.yml   -l '10.10.10.11,&pg-test'  # 在组 pg-test 的 10.10.10.10 上运行
/pgsql-rm.yml -l 'pg-test,!10.10.10.11'  # 在 pg-test 上运行，除了 10.10.10.11 以外
./pgsql.yml   -l pg-test                 # 在 pg-test 集群的主机上执行 pgsql 剧本

./pgsql.yml -t pg_clean    # 如果必要，清理现有的 postgres
./pgsql.yml -t pg_dbsu     # 为 postgres dbsu 设置操作系统用户 sudo
./pgsql.yml -t pg_install  # 安装 postgres 包和扩展
./pgsql.yml -t pg_dir      # 创建 postgres 目录并设置 fhs
./pgsql.yml -t pg_util     # 复制工具脚本，设置别名和环境
./pgsql.yml -t patroni     # 使用 patroni 引导 postgres
./pgsql.yml -t pg_user     # 提供 postgres 业务用户
./pgsql.yml -t pg_db       # 提供 postgres 业务数据库
./pgsql.yml -t pg_backup   # 初始化 pgbackrest 仓库和 basebackup
./pgsql.yml -t pgbouncer   # 与 postgres 一起部署 pgbouncer sidecar
./pgsql.yml -t pg_vip      # 使用 vip-manager 将 vip 绑定到 pgsql 主库
./pgsql.yml -t pg_dns      # 将 dns 名称注册到 infra dnsmasq
./pgsql.yml -t pg_service  # 使用 haproxy 暴露 pgsql 服务
./pgsql.yml -t pg_exporter # 使用 haproxy 暴露 pgsql 服务
./pgsql.yml -t pg_register # 将 postgres 注册到 pigsty 基础设施

# 运行多个任务：重新加载 postgres 和 pgbouncer hba 规则
./pgsql.yml -t pg_hba,pg_reload,pgbouncer_hba,pgbouncer_reload

# 运行多个任务：刷新 haproxy 配置并重新加载
./node.yml -t haproxy_config,haproxy_reload

./node.yml -e ansible_user=admin -k -K                  # 作为另一个用户运行剧本（带有 admin sudo 密码）
./pgsql.yml -e pg_clean=true                            # 在初始化 pgsql 实例时强制清除现有的 postgres
./pgsql-rm.yml -e pg_uninstall=true                     # 在 postgres 实例被删除后明确卸载 rpm
./redis.yml -l 10.10.10.11 -e redis_port=6379 -t redis  # 初始化一个特定的 redis 实例：10.10.10.11:6379
./redis-rm.yml -l 10.10.10.13 -e redis_port=6379        # 删除一个特定的 redis 实例：10.10.10.11:6379

# 通过指定软件包与仓库模块，在节点上安装 duckdb
./node.yml -t node_repo,node_pkg  -e '{"node_repo_modules":"infra","node_default_packages":["duckdb"]}'

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
brew install vagrant virtualbox ansible   # 在 MacOS 中可以轻松一键安装，但只有 x86_64 Intel 芯片的可以 

Specs = [
  {"name" => "meta",   "ip" => "10.10.10.10", "cpu" => "2",  "mem" => "4096", "image" => "generic/rocky9" },
  {"name" => "node-1", "ip" => "10.10.10.11", "cpu" => "1",  "mem" => "2048", "image" => "generic/rocky9" },
  {"name" => "node-2", "ip" => "10.10.10.12", "cpu" => "1",  "mem" => "2048", "image" => "generic/rocky9" },
  {"name" => "node-3", "ip" => "10.10.10.13", "cpu" => "1",  "mem" => "2048", "image" => "generic/rocky9" },
]

cd ~/pigsty
vagrant/switch <spec>

vagrant/switch meta     # singleton meta        | 别名：`make v1`
vagrant/switch full     # 4-node sandbox        | 别名：`make v4`
vagrant/switch el7      # 3-node el7 test       | 别名：`make v7`
vagrant/switch el8      # 3-node el8 test       | 别名：`make v8`
vagrant/switch el9      # 3-node el9 test       | 别名：`make v9`
vagrant/switch prod     # prod simulation       | 别名：`make vp`
vagrant/switch build    # building environment  | 别名：`make vd`
vagrant/switch minio    # 3-node minio env
vagrant/switch check    # 30-node check env

make         # 等于 make start
make new     # 销毁现有虚拟机，根据规格创建新的
make ssh     # 将 SSH 配置写入到 ~/.ssh/ 中 （新虚拟机拉起后必须完成这一步）
make dns     # 将 虚拟机 DNS 记录写入到 /etc/hosts 中 （如果想使用名称访问虚拟机)
make start   # 等于先执行 up ，再执行 ssh 
make up      # 根据配置拉起虚拟机，或启动现有虚拟机
make halt    # 关停现有虚拟机 (down,dw)
make clean   # 销毁现有虚拟机 (clean/del/destroy)
make status  # 显示虚拟机状态 (st)
make pause   # 暂停虚拟机运行 (suspend,pause)
make resume  # 恢复虚拟机运行 (resume)
make nuke    # 使用 virsh 销毁所有虚拟机 (仅libvirt可用) 

make meta     # 单个元节点
make full     # 4-节点沙箱
make el7      # 3-节点 el7 测试环境
make el8      # 3-节点 el8 测试环境
make el9      # 3-节点 el9 测试环境
make prod     # 42 节点生产仿真环境
make build    # 3-节点 EL7,8,9 构建环境
make check    # 30-节点构建校验测试环境
make minio    # 3-节点 MinIO 测试环境

make meta  install  # 进行完整的单机安装
make full  install  # 进行4节点沙箱安装
make prod  install  # 进行42节点生产仿真环境安装
make check install  # 进行30节点本地测试环境安装
...

cd terraform                         # 进入 Terraform 模板目录
cp spec/alicloud.tf terraform.tf     # 使用 阿里云 Terraform 模板

terraform init      # 安装 terraform 云供应商插件：例如默认的 aliyun 插件 (第一次使用时安装即可)
terraform apply     # 生成执行计划，显示会创建的云资源：虚拟机，网络，安全组，等等等等……

SET log_statement TO 'none';
ALTER USER "{{ user.name }}" PASSWORD '{{ user.password }}';
SET log_statement TO DEFAULT;

repo_upstream:
  - { name: pigsty-local   ,description: 'Pigsty Local'      ,module: local ,releases: [7,8,9] ,baseurl: { default: 'http://${admin_ip}/pigsty'  }} # used by intranet nodes
  - { name: pigsty-infra   ,description: 'Pigsty INFRA'      ,module: infra ,releases: [7,8,9] ,baseurl: { default: 'https://repo.pigsty.io/rpm/infra/$basearch' ,china: 'https://repo.pigsty.cc/rpm/infra/$basearch' }}
  - { name: pigsty-pgsql   ,description: 'Pigsty PGSQL'      ,module: pgsql ,releases: [7,8,9] ,baseurl: { default: 'https://repo.pigsty.io/rpm/pgsql/el$releasever.$basearch' ,china: 'https://repo.pigsty.cc/rpm/pgsql/el$releasever.$basearch' }}
  - { name: nginx          ,description: 'Nginx Repo'        ,module: infra ,releases: [7,8,9] ,baseurl: { default: 'https://nginx.org/packages/centos/$releasever/$basearch/' }}
  - { name: docker-ce      ,description: 'Docker CE'         ,module: infra ,releases: [7,8,9] ,baseurl: { default: 'https://download.docker.com/linux/centos/$releasever/$basearch/stable'        ,china: 'https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/$basearch/stable'  ,europe: 'https://mirrors.xtom.de/docker-ce/linux/centos/$releasever/$basearch/stable' }}
  - { name: base           ,description: 'EL 7 Base'         ,module: node  ,releases: [7    ] ,baseurl: { default: 'http://mirror.centos.org/centos/$releasever/os/$basearch/'                    ,china: 'https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/'           ,europe: 'https://mirrors.xtom.de/centos/$releasever/os/$basearch/'           }}
  - { name: updates        ,description: 'EL 7 Updates'      ,module: node  ,releases: [7    ] ,baseurl: { default: 'http://mirror.centos.org/centos/$releasever/updates/$basearch/'               ,china: 'https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/'      ,europe: 'https://mirrors.xtom.de/centos/$releasever/updates/$basearch/'      }}
  - { name: extras         ,description: 'EL 7 Extras'       ,module: node  ,releases: [7    ] ,baseurl: { default: 'http://mirror.centos.org/centos/$releasever/extras/$basearch/'                ,china: 'https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/'       ,europe: 'https://mirrors.xtom.de/centos/$releasever/extras/$basearch/'       }}
  - { name: epel           ,description: 'EL 7 EPEL'         ,module: node  ,releases: [7    ] ,baseurl: { default: 'http://download.fedoraproject.org/pub/epel/$releasever/$basearch/'            ,china: 'https://mirrors.tuna.tsinghua.edu.cn/epel/$releasever/$basearch/'                ,europe: 'https://mirrors.xtom.de/epel/$releasever/$basearch/'                }}
  - { name: centos-sclo    ,description: 'EL 7 SCLo'         ,module: node  ,releases: [7    ] ,baseurl: { default: 'http://mirror.centos.org/centos/$releasever/sclo/$basearch/sclo/'             ,china: 'https://mirrors.aliyun.com/centos/$releasever/sclo/$basearch/sclo/'              ,europe: 'https://mirrors.xtom.de/centos/$releasever/sclo/$basearch/sclo/'    }}
  - { name: centos-sclo-rh ,description: 'EL 7 SCLo rh'      ,module: node  ,releases: [7    ] ,baseurl: { default: 'http://mirror.centos.org/centos/$releasever/sclo/$basearch/rh/'               ,china: 'https://mirrors.aliyun.com/centos/$releasever/sclo/$basearch/rh/'                ,europe: 'https://mirrors.xtom.de/centos/$releasever/sclo/$basearch/rh/'      }}
  - { name: baseos         ,description: 'EL 8+ BaseOS'      ,module: node  ,releases: [  8,9] ,baseurl: { default: 'https://dl.rockylinux.org/pub/rocky/$releasever/BaseOS/$basearch/os/'         ,china: 'https://mirrors.aliyun.com/rockylinux/$releasever/BaseOS/$basearch/os/'          ,europe: 'https://mirrors.xtom.de/rocky/$releasever/BaseOS/$basearch/os/'     }}
  - { name: appstream      ,description: 'EL 8+ AppStream'   ,module: node  ,releases: [  8,9] ,baseurl: { default: 'https://dl.rockylinux.org/pub/rocky/$releasever/AppStream/$basearch/os/'      ,china: 'https://mirrors.aliyun.com/rockylinux/$releasever/AppStream/$basearch/os/'       ,europe: 'https://mirrors.xtom.de/rocky/$releasever/AppStream/$basearch/os/'  }}
  - { name: extras         ,description: 'EL 8+ Extras'      ,module: node  ,releases: [  8,9] ,baseurl: { default: 'https://dl.rockylinux.org/pub/rocky/$releasever/extras/$basearch/os/'         ,china: 'https://mirrors.aliyun.com/rockylinux/$releasever/extras/$basearch/os/'          ,europe: 'https://mirrors.xtom.de/rocky/$releasever/extras/$basearch/os/'     }}
  - { name: crb            ,description: 'EL 9 CRB'          ,module: node  ,releases: [    9] ,baseurl: { default: 'https://dl.rockylinux.org/pub/rocky/$releasever/CRB/$basearch/os/'            ,china: 'https://mirrors.aliyun.com/rockylinux/$releasever/CRB/$basearch/os/'             ,europe: 'https://mirrors.xtom.de/rocky/$releasever/CRB/$basearch/os/'        }}
  - { name: powertools     ,description: 'EL 8 PowerTools'   ,module: node  ,releases: [  8  ] ,baseurl: { default: 'https://dl.rockylinux.org/pub/rocky/$releasever/PowerTools/$basearch/os/'     ,china: 'https://mirrors.aliyun.com/rockylinux/$releasever/PowerTools/$basearch/os/'      ,europe: 'https://mirrors.xtom.de/rocky/$releasever/PowerTools/$basearch/os/' }}
  - { name: epel           ,description: 'EL 8+ EPEL'        ,module: node  ,releases: [  8,9] ,baseurl: { default: 'http://download.fedoraproject.org/pub/epel/$releasever/Everything/$basearch/' ,china: 'https://mirrors.tuna.tsinghua.edu.cn/epel/$releasever/Everything/$basearch/'     ,europe: 'https://mirrors.xtom.de/epel/$releasever/Everything/$basearch/'     }}
  - { name: pgdg-common    ,description: 'PostgreSQL Common' ,module: pgsql ,releases: [7,8,9] ,baseurl: { default: 'https://download.postgresql.org/pub/repos/yum/common/redhat/rhel-$releasever-$basearch' ,china: 'https://mirrors.tuna.tsinghua.edu.cn/postgresql/repos/yum/common/redhat/rhel-$releasever-$basearch' , europe: 'https://mirrors.xtom.de/postgresql/repos/yum/common/redhat/rhel-$releasever-$basearch' }}
  - { name: pgdg-extras    ,description: 'PostgreSQL Extra'  ,module: pgsql ,releases: [7,8,9] ,baseurl: { default: 'https://download.postgresql.org/pub/repos/yum/common/pgdg-rhel$releasever-extras/redhat/rhel-$releasever-$basearch' ,china: 'https://mirrors.tuna.tsinghua.edu.cn/postgresql/repos/yum/common/pgdg-rhel$releasever-extras/redhat/rhel-$releasever-$basearch' , europe: 'https://mirrors.xtom.de/postgresql/repos/yum/common/pgdg-rhel$releasever-extras/redhat/rhel-$releasever-$basearch' }}
  - { name: pgdg-el8fix    ,description: 'PostgreSQL EL8FIX' ,module: pgsql ,releases: [  8  ] ,baseurl: { default: 'https://download.postgresql.org/pub/repos/yum/common/pgdg-centos8-sysupdates/redhat/rhel-8-x86_64/' ,china: 'https://mirrors.tuna.tsinghua.edu.cn/postgresql/repos/yum/common/pgdg-centos8-sysupdates/redhat/rhel-8-x86_64/' , europe: 'https://mirrors.xtom.de/postgresql/repos/yum/common/pgdg-centos8-sysupdates/redhat/rhel-8-x86_64/' } }
  - { name: pgdg-el9fix    ,description: 'PostgreSQL EL9FIX' ,module: pgsql ,releases: [    9] ,baseurl: { default: 'https://download.postgresql.org/pub/repos/yum/common/pgdg-rocky9-sysupdates/redhat/rhel-9-x86_64/'  ,china: 'https://mirrors.tuna.tsinghua.edu.cn/postgresql/repos/yum/common/pgdg-rocky9-sysupdates/redhat/rhel-9-x86_64/' , europe: 'https://mirrors.xtom.de/postgresql/repos/yum/common/pgdg-rocky9-sysupdates/redhat/rhel-9-x86_64/' }}
  - { name: pgdg15         ,description: 'PostgreSQL 15'     ,module: pgsql ,releases: [7    ] ,baseurl: { default: 'https://download.postgresql.org/pub/repos/yum/15/redhat/rhel-$releasever-$basearch' ,china: 'https://mirrors.tuna.tsinghua.edu.cn/postgresql/repos/yum/15/redhat/rhel-$releasever-$basearch' ,europe: 'https://mirrors.xtom.de/postgresql/repos/yum/15/redhat/rhel-$releasever-$basearch' }}
  - { name: pgdg16         ,description: 'PostgreSQL 16'     ,module: pgsql ,releases: [  8,9] ,baseurl: { default: 'https://download.postgresql.org/pub/repos/yum/16/redhat/rhel-$releasever-$basearch' ,china: 'https://mirrors.tuna.tsinghua.edu.cn/postgresql/repos/yum/16/redhat/rhel-$releasever-$basearch' ,europe: 'https://mirrors.xtom.de/postgresql/repos/yum/16/redhat/rhel-$releasever-$basearch' }}
  - { name: timescaledb    ,description: 'TimescaleDB'       ,module: pgsql ,releases: [7,8,9] ,baseurl: { default: 'https://packagecloud.io/timescale/timescaledb/el/$releasever/$basearch'  }}

rm -rf /www/pigsty/repo_complete    # 删除 repo_complete 标记文件，以标记此仓库为不完整（这样会重新从上游下载软件）
rm -rf SomeBrokenRPMPackages        # 删除有问题的 RPM 包
./infra.yml -t repo_upstream        # 写入上游仓库。你也可以使用 /etc/yum.repos.d/backup/*
./infra.yml -t repo_pkg             # 根据你当前的操作系统下载软件包

ansible all -b -a 'yum remove -y nscd'

./infra.yml -t repo_upstream      # add upstream repos
cd /www/pigsty;                   # download missing packages
repotrack annobin gcc-plugin-annobin libuser
./infra.yml -t repo_create        # create repo

[defaults]
timeout = 10 # 将其修改为 60，120 或更高。

$ grep version  pigsty.yml 

$ cat /etc/os-release

cat ~/pigsty/pigsty.yml

journalctl -u patroni
journalctl -u <service name>

                    GNU AFFERO GENERAL PUBLIC LICENSE
                       Version 3, 19 November 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
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SUCH DAMAGES.

  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    Copyright (C) 2018-2024  Ruohang Feng, Author of Pigsty

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

  If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source.  For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code.  There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.