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Filename : zz-busybox-initramfs
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#!/bin/sh

# This hook copies busybox binary into the initramfs directory
# and creates all necessary links to it.
# It should be placed last into the hooks directory, in order to
# not overwrite commands which are provided by other means.

set -e

case "${1:-}" in
  prereqs)  echo ""; exit 0;;
esac

BB_BIN=/usr/lib/initramfs-tools/bin/busybox

[ n = "$BUSYBOX" ] && exit 0

[ -r /usr/share/initramfs-tools/hook-functions ] || exit 0
. /usr/share/initramfs-tools/hook-functions

if [ -f $DESTDIR/bin/sh ] && cmp -s $DESTDIR/bin/sh $BB_BIN ; then
  # initramfs copies busybox into /bin/sh, undo this
  rm -f $DESTDIR/bin/sh
fi
rm -f $DESTDIR/bin/busybox	# for compatibility with old initramfs
copy_exec $BB_BIN /bin/busybox

for alias in $($BB_BIN --list-long); do
  alias="${alias#/}"
  case "$alias" in
    # strip leading /usr, we don't use it
    usr/*) alias="${alias#usr/}" ;;
    */*) ;;
    *) alias="bin/$alias" ;;  # make it into /bin
  esac

  # Busybox is configured to prefer its own applets, so remove
  # duplication from klibc.
  name="${alias##*/}"
  if [ -e "$DESTDIR/$alias" ] && cmp -s "/usr/lib/klibc/bin/$name" "$DESTDIR/$alias"; then
    rm -f "$DESTDIR/$alias"
    [ "${verbose}" = "y" ] && echo "Preferring busybox $alias over klibc" || true
  fi

  [ -e "$DESTDIR/$alias" ] || \
    ln "$DESTDIR/bin/busybox" "$DESTDIR/$alias"
done

# Casper wants to have access to https, let busybox invoke openssl to
# achieve that.
# TODO: maybe have another variable like BUSYBOX_OPENSSL to include
# openssl if wanted? maybe like cloud-initramfs wants it?
if [ "$CASPER_GENERATE_UUID" ]; then
    mkdir -p $DESTDIR/etc/ssl/certs $DESTDIR/usr/lib/ssl/
    copy_exec /usr/bin/openssl
    copy_file config /etc/ssl/openssl.cnf
    update-ca-certificates --fresh --etccertsdir $DESTDIR/etc/ssl/certs --hooksdir /no-hooks
    # Only use by-hash certs
    rm -f $DESTDIR/etc/ssl/certs/ca-certificates.crt
    for cert in $DESTDIR/etc/ssl/certs/* ; do
        target=$(readlink $cert)
        case $target in
            /*)
                copy_file cert $target
                ;;
        esac
    done
    ln -s /etc/ssl/certs $DESTDIR/usr/lib/ssl/certs
    ln -s /etc/ssl/openssl.cnf $DESTDIR/usr/lib/ssl/openssl.cnf
fi