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# ex:ts=8 sw=4:
# $OpenBSD: Vstat.pm,v 1.12 2005/08/22 11:25:59 espie Exp $
#
# Copyright (c) 2003-2004 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# Provides stat and statfs-like functions for package handling.
# allows user to add/remove files.
# uses mount and df directly for now.
use strict;
use warnings;
package OpenBSD::Vstat;
use File::Basename;
my $devinfo = {};
my $devinfo2 = {};
my $virtual = {};
my $giveup;
sub create_device($)
{
my $dev = shift;
my $n = $devinfo->{$dev};
if (!defined $n) {
$n = { dev => $dev, used => 0, problems => 0 };
bless $n, "OpenBSD::Vstat::MountPoint";
$devinfo->{$dev} = $n;
}
return $n;
}
sub init_devices()
{
delete $ENV{'BLOCKSIZE'};
open(my $cmd1, "/sbin/mount|") or print STDERR "Can't run mount\n";
while (<$cmd1>) {
chomp;
if (m/^(.*?)\s+on\s+\/.*?\s+type\s+.*?(?:\s+\((.*?)\))?$/) {
my ($dev, $opts) = ($1, $2);
my $i = create_device($dev);
next unless defined $i;
next unless defined $opts;
for my $o (split /,\s*/, $opts) {
if ($o eq 'read-only') {
$i->{ro} = 1;
} elsif ($o eq 'nodev') {
$i->{nodev} = 1;
} elsif ($o eq 'nosuid') {
$i->{nosuid} = 1;
}
}
} else {
print STDERR "Can't parse mount line: $_\n";
}
}
close($cmd1) or print STDERR "Error running mount: $!\n";
$giveup = { used => 0 };
bless $giveup, "OpenBSD::Vstat::Failsafe";
}
sub ask_df($)
{
my $fname = shift;
my $info = $giveup;;
open(my $cmd2, "-|", "/bin/df", $fname) or print STDERR "Can't run df\n";
my $blocksize = 512;
while (<$cmd2>) {
chomp;
if (m/^Filesystem\s+(\d+)\-blocks/) {
$blocksize = $1;
} elsif (m/^(.*?)\s+\d+\s+\d+\s+(\-?\d+)\s+\d+\%\s+\/.*?$/) {
my ($dev, $avail) = ($1, $2);
$info = $devinfo->{$dev};
if (!defined $info) {
$info = create_device($dev);
}
$info->{avail} = $avail;
$info->{blocksize} = $blocksize;
}
}
close($cmd2) or print STDERR "Error running df: $!\n";
return $info;
}
init_devices();
sub filestat($);
sub filestat($)
{
my $fname = shift;
my $dev = (stat $fname)[0];
if (!defined $dev && $fname ne '/') {
return filestat(dirname($fname));
}
if (!defined $dev) {
return $giveup;
} else {
if (!defined $devinfo2->{$dev}) {
return $devinfo2->{$dev} = ask_df($fname);
} else {
return $devinfo2->{$dev};
}
}
}
sub vexists($)
{
my $name = shift;
if (defined $virtual->{$name}) {
return $virtual->{$name};
} else {
return -e $name;
}
}
sub account_for($$)
{
my ($name, $size) = @_;
my $e = filestat($name);
$e->{used} += $size;
return $e;
}
sub add($$;$)
{
my ($name, $size, $value) = @_;
if (defined $value) {
$virtual->{$name} = $value;
} else {
$virtual->{$name} = 1;
}
return defined($size) ? account_for($name, $size) : undef;
}
sub remove($$)
{
my ($name, $size) = @_;
$virtual->{$name} = 0;
return defined($size) ? account_for($name, -$size) : undef;
}
sub tally()
{
while (my ($device, $data) = each %$devinfo) {
if ($data->{used} != 0) {
print $device, ": ", $data->{used}, " bytes\n";
}
}
}
package OpenBSD::Vstat::MountPoint;
sub avail
{
my $self = $_[0];
return $self->{avail} - $self->{used}/$self->{blocksize};
}
package OpenBSD::Vstat::Failsafe;
sub avail
{
return 1;
}
1;
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