tests/env/env-null.sh

   1 #!/bin/sh
   2 # Verify behavior of env -0 and printenv -0.
   3
   4 # Copyright (C) 2009-2024 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ env printenv
  21
  22 # POSIX is clear that environ may, but need not be, sorted.
  23 # Environment variable values may contain newlines, which cannot be
  24 # observed by merely inspecting output from env.
  25 # Cygwin requires a minimal environment to launch new processes: execve
  26 # adds missing variables SYSTEMROOT and WINDIR, which show up in a
  27 # subsequent env.  Cygwin also requires /bin to always be part of PATH,
  28 # and attempts to unset or reduce PATH may cause execve to fail.
  29 #
  30 # For these reasons, it is better to compare two outputs from distinct
  31 # programs that should be the same, rather than building an exp file.
  32 env -i PATH="$PATH" env -0 > out1 || fail=1
  33 env -i PATH="$PATH" printenv -0 > out2 || fail=1
  34 compare out1 out2 || fail=1
  35 env -i PATH="$PATH" env --null > out2 || fail=1
  36 compare out1 out2 || fail=1
  37 env -i PATH="$PATH" printenv --null > out2 || fail=1
  38 compare out1 out2 || fail=1
  39
  40 # env -0 does not work if a command is specified.
  41 returns_ 125 env -0 echo hi > out || fail=1
  42 compare /dev/null out || fail=1
  43
  44 # Test env -0 on a one-variable environment.
  45 printf 'a=b\nc=\0' > exp || framework_failure_
  46 env -i -0 "$(printf 'a=b\nc=')" > out || fail=1
  47 compare exp out || fail=1
  48
  49 # Test printenv -0 on particular values.
  50 printf 'b\nc=\0' > exp || framework_failure_
  51 env "$(printf 'a=b\nc=')" printenv -0 a > out || fail=1
  52 compare exp out || fail=1
  53 returns_ 1 env -u a printenv -0 a > out || fail=1
  54 compare /dev/null out || fail=1
  55 returns_ 1 env -u b "$(printf 'a=b\nc=')" printenv -0 b a > out || fail=1
  56 compare exp out || fail=1
  57
  58 Exit $fail