tests/ls/stat-free-symlinks.sh

   1 #!/bin/sh
   2 # ensure that ls does not stat a symlink in an unusual case
   3
   4 # Copyright (C) 2007-2024 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_ ls
  21 require_strace_ stat
  22
  23 stats='stat'
  24 # List of other _file name_ stat functions to increase coverage.
  25 other_stats='statx lstat stat64 lstat64 newfstatat fstatat64'
  26 for stat in $other_stats; do
  27   strace -qe "$stat" true > /dev/null 2>&1 &&
  28     stats="$stats,$stat"
  29 done
  30
  31 # The system may perform additional stat-like calls before main.
  32 # Furthermore, underlying library functions may also implicitly
  33 # add an extra stat call, e.g. opendir since glibc-2.21-360-g46f894d.
  34 # To avoid counting those, first get a baseline count for running
  35 # ls with one empty directory argument.  Then, compare that with the
  36 # invocation under test.
  37 count_stats() { grep -vE '\+\+\+|ENOSYS|NOTSUP' "$1" | wc -l; }
  38 mkdir d || framework_failure_
  39 strace -q -o log1 -e $stats ls -F --color=always d || fail=1
  40 n_stat1=$(count_stats log1) || framework_failure_
  41
  42 test $n_stat1 = 0 \
  43   && skip_ 'No stat calls recognized on this platform'
  44
  45
  46 touch x || framework_failure_
  47 chmod a+x x || framework_failure_
  48 ln -s x link-to-x || framework_failure_
  49
  50
  51 # ls from coreutils 6.9 would unnecessarily stat a symlink in an unusual case:
  52 # When not coloring orphan and missing entries, and without ln=target,
  53 # ensure that ls -F (or -d, or -l: i.e., when not dereferencing)
  54 # does not stat a symlink to directory, and does still color that
  55 # symlink and an executable file properly.
  56
  57 LS_COLORS='or=0:mi=0:ex=01;32:ln=01;35' \
  58   strace -qe $stats -o log2 ls -F --color=always x link-to-x > out.tmp || fail=1
  59 n_stat2=$(count_stats log2) || framework_failure_
  60
  61 # Expect one more stat call,
  62 # which failed with coreutils 6.9 and earlier, which had 2.
  63 test $n_stat1 = $(($n_stat2 - 1)) \
  64   || { fail=1; head -n30 log*; }
  65
  66 # Check that output is colored, as requested, too.
  67 {
  68   printf '\033[0m\033[01;35mlink-to-x\033[0m@\n'
  69   printf '\033[01;32mx\033[0m*\n'
  70 } > exp || fail=1
  71 # Elide info messages strace can send to stdout of the form:
  72 #   [ Process PID=1234 runs in 32 bit mode. ]
  73 sed '/Process PID=/d' out.tmp > out
  74 compare exp out || fail=1
  75
  76 Exit $fail