test/create-busybox-container

   1 #!/usr/bin/env bash
   2
   3 set -e
   4 set -u
   5 set -o pipefail
   6
   7 root="${1:?Usage $0 container-root}"
   8 mkdir -p "$root"
   9 mkdir "$root/bin"
  10 cp $(type -P busybox) "$root/bin"
  11
  12 mkdir -p "$root/usr/lib"
  13 touch "$root/usr/lib/os-release"
  14
  15 ln -s busybox "$root/bin/sh"
  16 ln -s busybox "$root/bin/cat"
  17 ln -s busybox "$root/bin/tr"
  18 ln -s busybox "$root/bin/ps"
  19 ln -s busybox "$root/bin/ip"
  20
  21 mkdir -p "$root/sbin"
  22 cat <<'EOF' >"$root/sbin/init"
  23 #!/bin/sh
  24
  25 printf "ps aufx:\n"
  26 ps aufx
  27
  28 printf "/proc/1/cmdline:\n"
  29 printf "%s\n\n" "$(tr '\0' ' ' </proc/1/cmdline)"
  30
  31 printf "/proc/1/environ:\n"
  32 printf "%s\n\n" "$(tr '\0' '\n' </proc/1/environ)"
  33
  34 printf "/proc/1/mountinfo:\n"
  35 cat /proc/self/mountinfo
  36 printf "\n"
  37
  38 printf "/proc/1/cgroup:\n"
  39 printf "%s\n\n" "$(cat /proc/1/cgroup)"
  40
  41 printf "/proc/1/uid_map:\n"
  42 printf "%s\n\n" "$(cat /proc/1/uid_map)"
  43
  44 printf "/proc/1/setgroups:\n"
  45 printf "%s\n\n" "$(cat /proc/1/setgroups)"
  46
  47 printf "/proc/1/gid_map:\n"
  48 printf "%s\n\n" "$(cat /proc/1/gid_map)"
  49
  50 printf "ip link:\n"
  51 ip link
  52 EOF
  53 chmod +x "$root/sbin/init"