tests/df/df-symlink.sh

   1 #!/bin/sh
   2 # Ensure that df dereferences symlinks to file system nodes
   3
   4 # Copyright (C) 2013-2023 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ df
  21
  22 file_system=$(df --out=source '.' | tail -n1) ||
  23   skip_ "cannot determine '.' file system"
  24
  25 ln -s "$file_system" symlink || framework_failure_
  26
  27 df --out=source,target "$file_system" > exp ||
  28   skip_ "cannot get info for $file_system"
  29 df --out=source,target symlink > out || fail=1
  30 compare exp out || fail=1
  31
  32 # Ensure we output the same values for device nodes and '.'
  33 # This was not the case in coreutils-8.22 on systems
  34 # where the device in the mount list was a symlink itself.
  35 # I.e., '.' => /dev/mapper/fedora-home -> /dev/dm-2
  36 # Restrict this test to systems with a 1:1 mapping between
  37 # source and target.  This excludes for example BTRFS sub-volumes.
  38 if test "$(df --output=source | grep -F "$file_system" | wc -l)" = 1; then
  39   # Restrict to systems with a single file system root (and have findmnt(1))
  40   if test "$(findmnt -nro FSROOT | uniq | wc -l)" =  1; then
  41     df --out=source,target '.' > out || fail=1
  42     compare exp out || fail=1
  43   fi
  44 fi
  45
  46 test "$fail" = 1 && dump_mount_list_
  47
  48 Exit $fail