#!/bin/sh
# Show that --color need not use stat, as long as we have d_type support.

# Copyright (C) 2011-2023 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ ls
require_strace_ stat
require_dirent_d_type_

stats='stat'
# List of other _file name_ stat functions to increase coverage.
other_stats='statx lstat stat64 lstat64 newfstatat fstatat64'
for stat in $other_stats; do
  strace -qe "$stat" true > /dev/null 2>&1 &&
    stats="$stats,$stat"
done

# Disable enough features via LS_COLORS so that ls --color
# can do its job without calling stat (other than the obligatory
# one-call-per-command-line argument).
cat <<EOF > color-without-stat || framework_failure_
RESET 0
DIR 01;34
LINK 01;36
FIFO 40;33
SOCK 01;35
DOOR 01;35
BLK 40;33;01
CHR 40;33;01
ORPHAN 00
SETUID 00
SETGID 00
CAPABILITY 00
STICKY_OTHER_WRITABLE 00
OTHER_WRITABLE 00
STICKY 00
EXEC 00
MULTIHARDLINK 00
EOF
eval $(dircolors -b color-without-stat)

# The system may perform additional stat-like calls before main.
# Furthermore, underlying library functions may also implicitly
# add an extra stat call, e.g. opendir since glibc-2.21-360-g46f894d.
# Finally, ls(1) makes a stat call for stdout, but only in the case
# when there is something to output.
# To get the comparison right, first get a baseline count for running
# 'ls -a' with one empty directory argument.  Then, compare that with
# the invocation under test.
mkdir d || framework_failure_

count_stats() { grep -vE '\+\+\+|ENOSYS|NOTSUP' "$1" | wc -l; }
strace -q -o log1 -e $stats ls -a --color=always d || fail=1
n_stat1=$(count_stats log1) || framework_failure_

test $n_stat1 = 0 \
  && skip_ 'No stat calls recognized on this platform'

# Populate the test directory.
mkdir d/subdir \
  && touch d/regf \
  && ln d/regf d/hlink \
  && ln -s regf d/slink \
  && ln -s nowhere d/dangle \
  || framework_failure_

# Invocation under test.
strace -q -o log2 -e $stats ls --color=always d || fail=1
n_stat2=$(count_stats log2) || framework_failure_

# Expect the same number of stat calls.
test $n_stat1 = $n_stat2 \
  || { fail=1; head -n30 log*; }

Exit $fail