cycle

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# rm (coreutils-4.5.4) could be tricked into mistakenly reporting a cycle.

if test "$VERBOSE" = yes; then
  set -x
  rm --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 a/b
touch a/b/file
chmod u-w a/b

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

fail=0

rm -rf a a 2>&1 | sed 's/:[^:]*$//' > out || fail=1
cat <<\EOF > exp
rm: cannot remove `a/b/file'
rm: cannot remove `a/b/file'
EOF

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

(exit $fail); exit $fail