dup-source

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# Ensure that cp merely warns when a non-directory source file is
# listed on the command line more than once.  fileutils-4.1.1
# made this fail:  cp a a d/
# Ensure that mv fails with a similar command.

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

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

pwd=`pwd`
tmp=dup-src.$$
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 "$0: failure in testing framework" 1>&2
  (exit 1); exit
fi

fail=0

for i in cp; do

  # cp may not fail in this case.

  rm -fr a d; touch a; mkdir d
  $i a a d/ 2> out || fail=1
  rm -fr a d; touch a; mkdir d
  $i ./a a d/ 2>> out || fail=1

  # cp succeeds with --backup=numbered.
  rm -fr a d; touch a; mkdir d
  $i --backup=numbered a a d/ 2>> out || fail=1

  # But not with plain `--backup'
  rm -fr a d; touch a; mkdir d
  $i --backup a a d/ 2>> out && fail=1
  cat <<EOF > exp
$i: warning: source file \`a' specified more than once
$i: warning: source file \`a' specified more than once
$i: will not overwrite just-created \`d/a' with \`a'
EOF
  cmp out exp || fail=1
  test $fail = 1 && diff out exp 2> /dev/null
done

for i in mv; do
  # But mv *does* fail in this case (it has to).

  rm -fr a d; touch a; mkdir d
  $i a a d/ 2> out && fail=1
  rm -fr a d; touch a; mkdir d
  $i ./a a d/ 2>> out && fail=1
  cat <<EOF > exp
$i: cannot stat \`a': No such file or directory
$i: cannot stat \`a': No such file or directory
EOF
  cmp out exp || fail=1
  test $fail = 1 && diff out exp 2> /dev/null
done

(exit $fail); exit