#!/bin/sh
# Compare actual numbers from du, assuming block size matches mine.

# Copyright (C) 2003, 2006 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

if test "$VERBOSE" = yes; then
  set -x
  du --version
fi

# DU_BLOCK_SIZE could cause problems
. $srcdir/../envvar-check
. $srcdir/../lang-default

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd $pwd; chmod -R u+rwx $t0; rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15

framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1
mkdir -p a/b d d/sub || framework_failure=1

# Ensure that these files contain more than 64 bytes, so that we don't
# immediately disqualify file systems (e.g., NetApp) on which smaller
# files take up zero disk blocks.
printf '%*s' 257 make-sure-the-file-is-non-empty > a/b/F || framework_failure=1
seq --format=%100g 1 90 | head --bytes=4k > d/1
cp d/1 d/sub/2

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

fail=0

B=`stat --format=%B a/b/F`

du --block-size=$B -a a > out || fail=1
echo === >> out
du --block-size=$B -a -S a >> out || fail=1
echo === >> out
du --block-size=$B -s a >> out || fail=1

f=`stat --format=%b a/b/F`
b=`stat --format=%b a/b`
a=`stat --format=%b a`
bf=`expr $b + $f`
tot=`expr $bf + $a`

cat <<EOF | sed 's/ *#.*//' > exp
$f	a/b/F
$bf	a/b
$tot	a
===
$f	a/b/F   # size of file, a/b/F
$bf	a/b     # size of dir entry, a/b, + size of file, a/b/F
$a	a       # size of dir entry, a
===
$tot	a
EOF

cmp out exp || fail=1
test $fail = 1 && diff -u out exp 2> /dev/null

rm -f out exp
du --block-size=$B -a d | sort -r -k2,2 > out || fail=1
echo === >> out
du --block-size=$B -S d | sort -r -k2,2 >> out || fail=1

t2=`stat --format=%b d/sub/2`
ts=`stat --format=%b d/sub`
t1=`stat --format=%b d/1`
td=`stat --format=%b d`
tot=`expr $t1 + $t2 + $ts + $td`
d1=`expr $td + $t1`
s2=`expr $ts + $t2`

cat <<EOF | sed 's/ *#.*//' > exp
$t2	d/sub/2
$s2	d/sub
$t1	d/1
$tot	d
===
$s2	d/sub
$d1	d           # d + d/1; don't count the dir. entry for d/sub
EOF

cmp out exp || fail=1
test $fail = 1 && diff out exp 2> /dev/null

(exit $fail); exit $fail