.bin/custom-chroot

   1 #!/bin/bash -e
   2
   3 [[ -w / ]] || exec sudo "$0" "$@"
   4 [[ $# -eq 0 ]] && set -- env HOME=/root /bin/bash -l
   5 mounts="proc sys dev dev/pts"
   6
   7 chroot=${0%/*}
   8 case ${chroot} in
   9         .) chroot=${PWD} ;;
  10 esac
  11 cd "${chroot}"
  12
  13 maybe_mount() {
  14         local src=$1 dst=${2:-$1}
  15         mkdir -p $d/$m
  16         grep -sq "${chroot}/${dst}" /proc/mounts || mount --bind "/${src}" "${chroot}/${dst}"
  17 }
  18 for m in ${mounts} ; do
  19         maybe_mount ${m}
  20 done
  21
  22 get_type() {
  23         case $(file "$1") in
  24                 *x86-64*)        echo x86_64;;
  25                 *"Intel 80386"*) echo i386;;
  26         esac
  27 }
  28 bin_dst=$(get_type bin/bash)
  29 bin_src=$(get_type /bin/bash)
  30 if [[ ${bin_dst} == ${bin_src} ]] ; then
  31         setarch=
  32 else
  33         setarch="setarch ${bin_dst}"
  34 fi
  35
  36 if [[ ! -L etc/mtab ]] ; then
  37         rm -f etc/mtab
  38         ln -sf /proc/mounts etc/mtab
  39 fi
  40 etc="
  41         hosts
  42         locale.gen
  43         localtime
  44         resolv.conf
  45 "
  46 home="
  47         .inputrc
  48         .nanorc
  49 "
  50 for f in \
  51         $(printf 'etc/%s ' ${etc}) \
  52 ; do
  53         cp /${f} ${f}
  54 done
  55 for f in ${home} ; do
  56         cp ~/${f} root/${f}
  57 done
  58
  59 unset LS_COLORS # format changes over time
  60 exec \
  61         ${setarch} \
  62         chroot "${chroot}" \
  63         "$@"