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