no-x

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# Make sure du gives the right diagnostic for a readable,
# but inaccessible directory.

if test "$VERBOSE" = yes; then
  set -x
  du --version
fi

. $srcdir/../lang-default
PRIV_CHECK_ARG=require-non-root . $srcdir/../priv-check

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd $pwd; chmod -R u+rwx $t0; rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15

framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1
mkdir -p d/no-x/y || framework_failure=1
chmod u=rw d/no-x || framework_failure=1

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

fail=0

# This must exit nonzero.
du d >/dev/null 2>out && fail=1
cat <<\EOF > exp
du: cannot change to directory `d/no-x': Permission denied
EOF

cmp out exp || fail=1
test $fail = 1 && diff out exp 2> /dev/null

(exit $fail); exit $fail