tests/cp/preserve-gid.sh

   1 #!/bin/sh
   2 # Verify that cp -p preserves GID when it is possible.
   3
   4 # Copyright (C) 2007-2016 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ cp
  21
  22 require_root_
  23
  24 # Some of the tests expect a umask that grants group and/or world read access.
  25 working_umask_or_skip_
  26
  27 # Record primary group number, usually 0.
  28 # This is the group ID used when cp (without -p) creates a new file.
  29 primary_group_num=$(id -g)
  30
  31 create() {
  32   echo "$1" > "$1" || exit 1
  33   chown "+$2:+$3" "$1" || exit 1
  34 }
  35
  36 t0() {
  37   f=$1; shift
  38   u=$1; shift
  39   g=$1; shift
  40   rm -f b || exit 1
  41   "$@" "$f" b || exit 1
  42   s=$(stat -c '%u %g' b)
  43   if test "x$s" != "x$u $g"; then
  44     # Allow the actual group to match that of the parent directory
  45     # (it was set to 0 above).
  46     if test "x$s" = "x$u $primary_group_num"; then
  47       :
  48     else
  49       echo "$0: $* $f b: $u $g != $s" 1>&2
  50       Exit 1
  51     fi
  52   fi
  53 }
  54
  55 nameless_uid=$($PERL -le '
  56   foreach my $i (1000..16*1024-1)
  57     {
  58       getpwuid $i or (print $i), exit
  59     }
  60 ')
  61 nameless_gid1=$($PERL -le '
  62   foreach my $i (1000..16*1024)
  63     {
  64       getgrgid $i or (print $i), exit
  65     }
  66 ')
  67 nameless_gid2=$($PERL -le '
  68   foreach my $i ('"$nameless_gid1"'+1..16*1024)
  69     {
  70       getgrgid $i or (print $i), exit
  71     }
  72 ')
  73
  74 if test -z "$nameless_uid" \
  75     || test -z "$nameless_gid1" \
  76     || test -z "$nameless_gid2"; then
  77   skip_ "couldn't find a nameless UID or GID"
  78 fi
  79
  80 chown "+$nameless_uid:+0" .
  81
  82 create a0 0 0
  83 create b0 "$nameless_uid" "$nameless_gid1"
  84 create b1 "$nameless_uid" "$nameless_gid2"
  85 create c0 0 "$nameless_gid1"
  86 create c1 0 "$nameless_gid2"
  87
  88 t0 a0 0 0 cp
  89 t0 b0 0 0 cp
  90 t0 b1 0 0 cp
  91 t0 c0 0 0 cp
  92 t0 c1 0 0 cp
  93
  94 t0 a0 0 0 cp -p
  95 t0 b0 "$nameless_uid" "$nameless_gid1" cp -p
  96 t0 b1 "$nameless_uid" "$nameless_gid2" cp -p
  97 t0 c0 0 "$nameless_gid1" cp -p
  98 t0 c1 0 "$nameless_gid2" cp -p
  99
 100 # For the remaining tests, we need a cp binary that is accessible to a user
 101 # with UID of $nameless_uid.  The build directory may not be accessible,
 102 # so create a temporary directory and copy cp into it, ensure that
 103 # $nameless_uid can access it and then make that directory the search path.
 104 tmp_path=
 105 cleanup_() { rm -rf "$tmp_path"; }
 106
 107 # Cause mktemp to create a directory directly under /tmp.
 108 # Setting TMPDIR explicitly is required here, in case $TMPDIR
 109 # is not readable by our nameless IDs.
 110 test -d /tmp && TMPDIR=/tmp
 111 tmp_path=$(mktemp -d) || fail_ "failed to create temporary directory"
 112 cp "$abs_path_dir_/cp" "$tmp_path"
 113 chmod -R a+rx "$tmp_path"
 114
 115 t1() {
 116   f=$1; shift
 117   u=$1; shift
 118   g=$1; shift
 119   t0 "$f" "$u" "$g" \
 120       chroot --skip-chdir \
 121              --user=+$nameless_uid:+$nameless_gid1 \
 122              --groups="+$nameless_gid1,+$nameless_gid2" \
 123         / env PATH="$tmp_path" "$@"
 124 }
 125
 126 t1 a0 "$nameless_uid" "$nameless_gid1" cp
 127 t1 b0 "$nameless_uid" "$nameless_gid1" cp
 128 t1 b1 "$nameless_uid" "$nameless_gid1" cp
 129 t1 c0 "$nameless_uid" "$nameless_gid1" cp
 130 t1 c1 "$nameless_uid" "$nameless_gid1" cp
 131
 132 t1 a0 "$nameless_uid" "$nameless_gid1" cp -p
 133 t1 b0 "$nameless_uid" "$nameless_gid1" cp -p
 134 t1 b1 "$nameless_uid" "$nameless_gid2" cp -p
 135 t1 c0 "$nameless_uid" "$nameless_gid1" cp -p
 136 t1 c1 "$nameless_uid" "$nameless_gid2" cp -p
 137
 138 Exit $fail