fail-2eperm

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# Like fail-eperm, but the failure must be for a file encountered
# while trying to remove the containing directory with the sticky bit set.

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

. $srcdir/../lang-default
PRIV_CHECK_ARG=require-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

# Find a username with UID != 0, and a valid shell.
non_root_username=
names=`grep -v '[^:]*:[^:]*:0:' /etc/passwd| sed 's/:.*//'`
for name in $names; do
  su -c ':' $name && { non_root_username=$name; break; }
done
test "x$non_root_username" = x && framework_failure=1

# The containing directory must be owned by the user who eventually runs rm.
chown $non_root_username .

mkdir a || framework_failure=1
chmod 1777 a || framework_failure=1
touch a/b || framework_failure=1

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

fail=0

su -c 'rm -rf a' $non_root_username 2> out && fail=1
cat <<\EOF > exp
rm: cannot remove `a/b': Operation not permitted
EOF

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

(exit $fail); exit $fail