link-preserve

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 -d' preserves hard-links between command line arguments
# ensure that --preserve=links works with -RH and -RL

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

. $srcdir/../envvar-check
. $srcdir/../lang-default

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp;tmp=$t0/$$
trap 'status=$?; cd $pwd; 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
touch a || framework_failure=1
ln a b || framework_failure=1
mkdir c || framework_failure=1
cp -d a b c || framework_failure=1
test -f c/a || framework_failure=1
test -f c/b || framework_failure=1

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

fail=0

a_inode=`ls -i c/a|sed 's,c/.*,,'`
b_inode=`ls -i c/b|sed 's,c/.*,,'`
test "$a_inode" = "$b_inode" || fail=1
# --------------------------------------

rm -rf a b c
touch a
ln -s a b
mkdir c
cp --preserve=links -R -H a b c
a_inode=`ls -i c/a|sed 's,c/.*,,'`
b_inode=`ls -i c/b|sed 's,c/.*,,'`
test "$a_inode" = "$b_inode" || fail=1
# --------------------------------------

rm -rf a b c d
mkdir d
(cd d; touch a; ln -s a b)
cp --preserve=links -R -L d c
a_inode=`ls -i c/a|sed 's,c/.*,,'`
b_inode=`ls -i c/b|sed 's,c/.*,,'`
test "$a_inode" = "$b_inode" || fail=1
# --------------------------------------

# Ensure that --no-preserve=links works.
rm -rf a b c d
mkdir d
(cd d; touch a; ln a b)
cp -dR --no-preserve=links d c
a_inode=`ls -i c/a|sed 's,c/.*,,'`
b_inode=`ls -i c/b|sed 's,c/.*,,'`
test "$a_inode" = "$b_inode" && fail=1
# --------------------------------------

# Ensure that -d still preserves hard links.
rm -rf a b c d
touch a; ln a b
mkdir c
cp -d a b c
a_inode=`ls -i c/a|sed 's,c/.*,,'`
b_inode=`ls -i c/b|sed 's,c/.*,,'`
test "$a_inode" = "$b_inode" || fail=1
# --------------------------------------

# Ensure that --no-preserve=mode works
rm -rf a b c d
touch a; chmod 731 a
umask 077
cp -a --no-preserve=mode a b
set _ `ls -l b`; shift; mode=$1
test "$mode" = "-rwx------" || fail=1
umask 022
# --------------------------------------

(exit $fail); exit