tests/cp/preserve-link.sh

   1 #!/bin/sh
   2 # Exercise the fix for http://debbugs.gnu.org/8419
   3
   4 # Copyright (C) 2011-2016 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 <http://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ cp
  21
  22 same_inode()
  23 {
  24   local u v
  25   u=$(stat --format %i "$1") &&
  26     v=$(stat --format %i "$2") && test "$u" = "$v"
  27 }
  28
  29 create_source_tree()
  30 {
  31   rm -Rf s
  32   mkdir s || framework_failure_
  33
  34   # a missing link in dest will be created
  35   touch s/f || framework_failure_
  36   ln s/f s/linkm || framework_failure_
  37
  38   # an existing link in dest will be maintained
  39   ln s/f s/linke || framework_failure_
  40
  41   # a separate older file in dest will be overwritten
  42   ln s/f s/fileo || framework_failure_
  43
  44   # a separate newer file in dest will be overwritten!
  45   ln s/f s/fileu || framework_failure_
  46 }
  47
  48 create_target_tree()
  49 {
  50   f=$1 # which of f or linkm to create in t/
  51
  52   rm -Rf t
  53   mkdir -p t/s/ || framework_failure_
  54
  55   # a missing link in dest must be created
  56   touch t/s/$f || framework_failure_
  57
  58   # an existing link must be maintained
  59   ln t/s/$f t/s/linke || framework_failure_
  60
  61   # a separate older file in dest will be overwritten
  62   touch -d '-1 hour' t/s/fileo || framework_failure_
  63
  64   # a separate newer file in dest will be overwritten!
  65   touch -d '+1 hour' t/s/fileu || framework_failure_
  66 }
  67
  68
  69 # Note we repeat this, creating either one of
  70 # two hard linked files from source in the dest, so as to
  71 # test both paths in $(cp) for creating the hard links.
  72 # The path taken by cp is dependent on which cp encounters
  73 # first in the source, which is non deterministic currently
  74 # (I'm guessing that results are sorted by inode and
  75 # beauses they're the same here, and due to the sort
  76 # being unstable, either can be processed first).
  77 create_source_tree
  78
  79 for f in f linkm; do
  80   create_target_tree $f
  81
  82   # Copy all the hard links across.  With cp from coreutils-8.12
  83   # and prior, it would sometimes mistakenly copy rather than link.
  84   cp -au s t || fail=1
  85
  86   same_inode t/s/f t/s/linkm || fail=1
  87   same_inode t/s/f t/s/linke || fail=1
  88   same_inode t/s/f t/s/fileo || fail=1
  89   same_inode t/s/f t/s/fileu || fail=1
  90 done
  91
  92 Exit $fail