tests/cp/thru-dangling.sh

   1 #!/bin/sh
   2 # Ensure that cp works as documented, when the destination is a dangling symlink
   3
   4 # Copyright (C) 2007-2024 Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ cp
  21
  22 ln -s no-such dangle || framework_failure_
  23 echo hi > f || framework_failure_
  24 echo hi > exp || framework_failure_
  25 echo "cp: not writing through dangling symlink 'dangle'" \
  26     > exp-err || framework_failure_
  27
  28
  29 # Starting with 6.9.90, this usage fails, by default:
  30 for opt in '' '-f'; do
  31   returns_ 1 cp $opt f dangle > err 2>&1 || fail=1
  32   compare exp-err err || fail=1
  33   test -f no-such && fail=1
  34 done
  35
  36
  37 # But you can set POSIXLY_CORRECT to get the historical behavior.
  38 env POSIXLY_CORRECT=1 cp f dangle > out 2>&1 || fail=1
  39 cat no-such >> out || fail=1
  40 compare exp out || fail=1
  41
  42
  43 # Starting with 8.30 we treat ELOOP as existing and so
  44 # remove the symlink
  45 ln -s loop loop || framework_failure_
  46 cp -f f loop > err 2>&1 || fail=1
  47 compare /dev/null err || fail=1
  48 compare exp loop || fail=1
  49 test -f loop || fail=1
  50
  51 Exit $fail