not-owner

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 that touch gives reasonable diagnostics when applied
# to an unwritable directory owned by some other user.

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

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

pwd=`pwd`
tmp=fail-diag.$$
trap 'status=$?; cd $pwd; rm -rf $tmp && exit $status' 0
trap '(exit $?); exit' 1 2 13 15

framework_failure=0
mkdir $tmp || framework_failure=1
cd $tmp || framework_failure=1

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

fail=0

# Before fileutils-4.1, we'd get the following misleading
# diagnostic instead of `...: Permission denied'.
# touch: creating `/': Is a directory
touch / > out 2>&1 && fail=1

# On SunOS4, EPERM is `Not owner'.
# On some *BSD systems it's `Operation not permitted'.
for msg in 'Not owner' 'Operation not permitted' 'Permission denied'; do
  cat > exp <<EOF
touch: setting times of \`/': $msg
EOF

  cmp out exp > /dev/null 2>&1 && { match=1; break; }
done
test "$match" = 1 || fail=1

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

(exit $fail); exit