tests/du/long-from-unreadable.sh

   1 #!/bin/sh
   2 # Show fts fails on old-fashioned systems.
   3
   4 # Copyright (C) 2006-2024 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 # Show that fts (hence du, chmod, chgrp, chown) fails when all of the
  20 # following are true:
  21 #   - '.' is not readable
  22 #   - operating on a hierarchy containing a relative name longer than PATH_MAX
  23 #   - run on a system where gnulib's openat emulation must resort to using
  24 #       save_cwd and restore_cwd (which fail if '.' is not readable).
  25 # Thus, the following du invocation should succeed on newer Linux and
  26 # Solaris systems, yet it must fail on systems lacking both openat and
  27 # /proc support.  However, before coreutils-6.0 this test would fail even
  28 # on Linux+PROC_FS systems because its fts implementation would revert
  29 # unnecessarily to using FTS_NOCHDIR mode in this corner case.
  30
  31 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  32 print_ver_ du
  33
  34 require_perl_
  35
  36 # ecryptfs for example uses some of the file name space
  37 # for encrypting filenames, so we must check dynamically.
  38 name_max=$(stat -f -c %l .)
  39 test "$name_max" -ge '200' || skip_ "NAME_MAX=$name_max is not sufficient"
  40
  41 proc_file=/proc/self/fd
  42 if test ! -d $proc_file; then
  43   skip_ 'This test would fail, since your system lacks /proc support.'
  44 fi
  45
  46 dir=$(printf '%200s\n' ' '|tr ' ' x)
  47
  48 # Construct a hierarchy containing a relative file with a name
  49 # longer than PATH_MAX.
  50 # for i in $(seq 52); do
  51 #   mkdir $dir || framework_failure_
  52 #   cd $dir || framework_failure_
  53 # done
  54 # cd $tmp || framework_failure_
  55
  56 # Sheesh.  Bash 3.1.5 can't create this hierarchy.  I get
  57 #   cd: error retrieving current directory: getcwd:
  58 #     cannot access parent directories:
  59 # (all on one line).
  60
  61 cwd=$(pwd)
  62 # Use perl instead:
  63 $PERL \
  64     -e 'my $d = '$dir'; foreach my $i (1..52)' \
  65     -e '  { mkdir ($d, 0700) && chdir $d or die "$!" }' \
  66   || framework_failure_
  67
  68 mkdir inaccessible || framework_failure_
  69 cd inaccessible || framework_failure_
  70 chmod 0 . || framework_failure_
  71
  72 du -s "$cwd/$dir" > /dev/null || fail=1
  73
  74 Exit $fail