#!/bin/sh
ROOTSRC=$1
shift
OLDROOT=tmp/oldroot

printf '%s\n' "fdmove 0 3"
printf '%s\n' "if { mount --bind \"$ROOTSRC\" /mnt/chroot }"
printf '%s\n' "cd /mnt/chroot"
printf '%s\n' "if { mount -t proc proc proc }"
printf '%s\n' "if { mount -t devpts devpts dev/pts }"
printf '%s\n' "if { mount -t tmpfs tmp run }"
printf '%s\n' "if { mount -t tmpfs tmp tmp }"
printf '%s\n' "if { mkdir \"$OLDROOT\" tmp/bin }"
printf '%s\n' "if { cp -a /bin/busybox /bin/chpst /bin/if tmp/bin }"
printf '%s\n' "if { pivot_root . \"$OLDROOT\" }"
awk -vROOT=/$OLDROOT '$5 {print "/tmp/bin/if { /tmp/bin/if -n -t { /tmp/bin/busybox umount "ROOT $5" } /tmp/bin/busybox umount -l "ROOT $5" }" }' /proc/self/mountinfo | tac
printf '%s' "./tmp/bin/chpst -/ ."
printf ' "%s"' "$@"
printf '\n'