#!/bin/sh
# Ensure "df --total" computes well summary statistics

# Copyright (C) 2008 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 <http://www.gnu.org/licenses/>.

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

. $srcdir/test-lib.sh

fail=0

# Don't let a different umask perturb the results.
umask 22

echo '
BEGIN {
  total     = 0
  used      = 0
  available = 0
}
{
  if (NR==1 || $0==$1 || $0~/^total +(-?[0-9]+|-) +(-?[0-9]+|-) +(-?[0-9]+|-) +-?[0-9]+%$/)
    next
  if ($1~/^[0-9]/)
    {
      total     += $1
      used      += $2
      available += $3
    }
  else
    {
      total     += $2
      used      += $3
      available += $4
    }
}
END {
  print total
  print used
  print available
}
' > compute_sum.awk || fail=1

echo '
/^total +(-?[0-9]+|-) +(-?[0-9]+|-) +(-?[0-9]+|-) +-?[0-9]+%$/ {
  print $2;
  print $3;
  print $4
}
' > parse_total.awk || fail=1

# Use --block-size=512 to keep df from printing rounded-to-kilobyte
# numbers which wouldn't necessarily add up to the displayed total.
df --block-size=512 --total |tee tmp || fail=1
$AWK -f compute_sum.awk tmp > out1 || fail=1
$AWK -f parse_total.awk tmp > out2 || fail=1
compare out1 out2 || fail=1

df -i --block-size=512 --total |tee tmp || fail=1
$AWK -f compute_sum.awk tmp > out1 || fail=1
$AWK -f parse_total.awk tmp > out2 || fail=1
compare out1 out2 || fail=1

Exit $fail