110 lines
2.7 KiB
Bash
110 lines
2.7 KiB
Bash
#!/bin/bash
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# Ver: 1.2 by Endial Fang (endial@126.com)
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#
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# 操作系统控制函数库
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# 加载依赖项
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. /usr/local/scripts/liblog.sh # 日志输出函数库
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# 函数列表
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# 检测指定用户账户是否存在
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# 参数:
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# $1 - 用户账户
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user_exists() {
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local user="${1:?user is missing}"
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id "$user" >/dev/null 2>&1
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}
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# 检测指定用户分组是否存在
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# 参数:
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# $1 - 用户组
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group_exists() {
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local group="${1:?group is missing}"
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getent group "$group" >/dev/null 2>&1
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}
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# 获取系统可用内存大小(MB)信息
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get_total_memory() {
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echo $(($(grep MemTotal /proc/meminfo | awk '{print $2}') / 1024))
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}
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# 获取以定量方式描述的内存大小
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# 参数:
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# $1 - 内存大小 (MB，可选)
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get_machine_size() {
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local memory="${1:-}"
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if [[ -z "$memory" ]]; then
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debug "Memory was not specified, detecting available memory automatically"
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memory="$(get_total_memory)"
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fi
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sanitized_memory=$(convert_to_mb "$memory")
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if [[ "$sanitized_memory" -gt 26000 ]]; then
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echo 2xlarge
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elif [[ "$sanitized_memory" -gt 13000 ]]; then
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echo xlarge
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elif [[ "$sanitized_memory" -gt 6000 ]]; then
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echo large
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elif [[ "$sanitized_memory" -gt 3000 ]]; then
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echo medium
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elif [[ "$sanitized_memory" -gt 1500 ]]; then
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echo small
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else
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echo micro
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fi
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}
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# 获取已定义的所有内存大小描述
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get_supported_machine_sizes() {
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echo micro small medium large xlarge 2xlarge
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}
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# 将以字符串表示的内存大小转换为以MB为单位的内存大小值 (i.e. 2G -> 2048)
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# 参数:
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# $1 - 内存大小
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convert_to_mb() {
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local amount="${1:-}"
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if [[ $amount =~ ^([0-9]+)(M|G) ]]; then
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size="${BASH_REMATCH[1]}"
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unit="${BASH_REMATCH[2]}"
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if [[ "$unit" = "G" ]]; then
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amount="$((size * 1024))"
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else
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amount="$size"
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fi
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fi
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echo "$amount"
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}
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# 如果禁用调试模式，将输出信息重定向至 /dev/null
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# 参数:
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# $@ - 待执行的命令
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debug_execute() {
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local -r bool="${ENV_DEBUG:-false}"
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shopt -s nocasematch
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if [[ "$bool" = 1 || "$bool" =~ ^(yes|true)$ ]]; then
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"$@"
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else
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"$@" >/dev/null 2>&1
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fi
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}
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# 重试执行命令
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# 参数:
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# $1 - cmd (as a string)
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# $2 - 最大尝试次数. Default: 12
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# $3 - 重试前等待时间(秒). Default: 5
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retry_while() {
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local -r cmd="${1:?cmd is missing}"
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local -r retries="${2:-12}"
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local -r sleep_time="${3:-5}"
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local return_value=1
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read -r -a command <<< "$cmd"
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for ((i = 1 ; i <= retries ; i+=1 )); do
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"${command[@]}" && return_value=0 && break
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sleep "$sleep_time"
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done
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return $return_value
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}
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