编辑文件 - zz-busybox-initramfs

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路径: /snap/core/17284/usr/share/initramfs-tools/hooks/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

[ -x $BB_BIN ] || exit 0

if [ -f /etc/initramfs-tools/initramfs.conf ]; then
  . /etc/initramfs-tools/initramfs.conf
  [ n = "$BUSYBOX" ] && exit 0
fi

[ -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

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