into-self-2

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# Force mv to use the copying code.
# Consider the case where SRC and DEST are on different
# partitions and DEST is a symlink to SRC.

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

. $srcdir/setup
. $srcdir/../envvar-check

if test -z "$other_partition_tmpdir"; then
  exit 77
fi

file="$other_partition_tmpdir/file"
symlink=symlink

fail=0

trap 'rm -fr out out2 exp $file $symlink $other_partition_tmpdir; exit $fail' \
  0 1 2 3 15

framework_failure=0
rm -f $file $symlink || framework_failure=1
echo whatever > $file || framework_failure=1
ln -s $file $symlink || framework_failure=1

if test $framework_failure = 1; then
  echo 'failure in testing framework'
  exit 1
fi

# Make sure we get English translations.
. $srcdir/../lang-default

# This mv command should exit nonzero.
mv $symlink $file > out 2>&1 && fail=1

# This should succeed.
mv $file $symlink || fail=1

sed \
   -e "s,mv:,XXX:," \
   -e "s,$file,YYY," \
   -e "s,$symlink,ZZZ," \
  out > out2

cat > exp <<\EOF
XXX: `ZZZ' and `YYY' are the same file
EOF
#'

cmp out2 exp || fail=1
test $fail = 1 && diff out2 exp 2> /dev/null

exit $fail