source: kBuild/trunk/src/grep/tests/symlink

#!/bin/sh
# Check that "grep -r" does the right thing with symbolic links.

# Copyright (C) 2012-2021 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

# written by Paul Eggert

. "${srcdir=.}/init.sh"; path_prepend_ ../src

mkdir dir || framework_failure_
echo a > dir/a || framework_failure_
echo b > dir/b || framework_failure_
ln -s a dir/c || framework_failure_
ln -s . dir/d || framework_failure_
ln -s dangling dir/e || framework_failure_

touch out || framework_failure_

for recursion in '' -r -R
do
  for files in '' '*'
  do
    case $recursion,$files in
      -R,* | *,'*') expected_status=2 ;;
      *) expected_status=0 ;;
    esac

    (cd dir && grep $recursion '^' $files <a ) >grepout
    test $? -eq $expected_status || fail=1

    case $recursion,$files in
      ,)
         exp='a\n' ;;
      ,'*' | -R,)
         exp='a:a\nb:b\nc:a\n' ;;
      -r,)
         exp='a:a\nb:b\n' ;;
      -r,'*')
         exp='a:a\nb:b\nc:a\nd/a:a\nd/b:b\n' ;;
      -R,'*')
         exp='a:a\nb:b\nc:a\nd/a:a\nd/b:b\nd/c:a\n' ;;
      *)
         framework_failure_ ;;
    esac

    printf "$exp" >exp || framework_failure_

    LC_ALL=C sort grepout >out || fail=1

    compare exp out || fail=1
  done
done

Exit $fail