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 ID_LIKE=$(awk -F= '$1=="ID_LIKE" { print $2 ;}' /etc/os-release)
  13 if [[ "$ID_LIKE" = *"suse"* ]]; then
  14     mkdir -p "$root/lib"
  15     mkdir -p "$root/lib64"
  16     for lib in $(find /lib*/ld*); do
  17         [[ -d $root/$(dirname $lib) ]] || mkdir -p $root/$(dirname $lib)
  18         cp $lib $root/$lib
  19     done
  20 fi
  21
  22 mkdir -p "$root/usr/lib"
  23 touch "$root/usr/lib/os-release"
  24
  25 ln -s busybox "$root/bin/sh"
  26 ln -s busybox "$root/bin/cat"
  27 ln -s busybox "$root/bin/tr"
  28 ln -s busybox "$root/bin/ps"
  29 ln -s busybox "$root/bin/ip"
  30
  31 mkdir -p "$root/sbin"
  32 cat <<'EOF' >"$root/sbin/init"
  33 #!/bin/sh
  34
  35 printf "ps aufx:\n"
  36 ps aufx
  37
  38 printf "/proc/1/cmdline:\n"
  39 printf "%s\n\n" "$(tr '\0' ' ' </proc/1/cmdline)"
  40
  41 printf "/proc/1/environ:\n"
  42 printf "%s\n\n" "$(tr '\0' '\n' </proc/1/environ)"
  43
  44 printf "/proc/1/mountinfo:\n"
  45 cat /proc/self/mountinfo
  46 printf "\n"
  47
  48 printf "/proc/1/cgroup:\n"
  49 printf "%s\n\n" "$(cat /proc/1/cgroup)"
  50
  51 printf "/proc/1/uid_map:\n"
  52 printf "%s\n\n" "$(cat /proc/1/uid_map)"
  53
  54 printf "/proc/1/setgroups:\n"
  55 printf "%s\n\n" "$(cat /proc/1/setgroups)"
  56
  57 printf "/proc/1/gid_map:\n"
  58 printf "%s\n\n" "$(cat /proc/1/gid_map)"
  59
  60 printf "ip link:\n"
  61 ip link
  62 EOF
  63 chmod +x "$root/sbin/init"