sample

ensure_privileged_inside_docker_container.sh

#!/bin/bash

function ensure_privileged_or_exit() {
    grep -xq $'CapBnd:\t0000003fffffffff' /proc/self/status || \
        (echo -e "[ERROR] Run with --privileged option." ; exit 1)
}

### Main
ensure_privileged_or_exit

ensure_privileged_inside_docker_container_v2.sh

#!/bin/bash

set -e
set -o pipefail

function ensure_privileged_or_exit() {
    local i=0
    local n=0

    # make bitmask (1111...111) 
    s=$(printf "%-$(($(cat /proc/sys/kernel/cap_last_cap) + 1))s" "1")
    str="${s// /1}"

    # translate to decimal number (n)
    while [ $i -lt ${#str} ]; do
        n=$(( 2*n + ${str:$i:1} ))
        i=$((i+1))
    done

    # check process status
    grep -xq "$(printf 'CapBnd:\t%.16x' $n)" /proc/self/status || \
        (echo -e "[ERROR] Run with --privileged option." ; exit 1)
}

### Main
ensure_privileged_or_exit

감사합니다. 덕분에 유용하게 쓰고있습니다