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# $OpenBSD: Vstat.pm,v 1.6 2004/07/07 22:00:06 espie Exp $
#
# Copyright (c) 2003 Marc Espie.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
# PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# 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;
use Symbol;
my $dirinfo = {};
my $virtual = {};
my $virtual_dir = {};
my $mnts = [];
my $blocksize = 512;
sub create_mntpoint($)
{
my $mntpoint = shift;
my $dev = (stat $mntpoint)[0];
# check that stat worked
return undef unless defined $dev;
my $n = $dirinfo->{"$dev"};
if (!defined $n) {
$n = { mnt => $mntpoint, dev => $dev, used => 0 };
bless $n, "OpenBSD::Vstat::MountPoint";
$dirinfo->{"$dev"} = $n;
$dirinfo->{"$mntpoint"} = $n;
push(@$mnts, $n);
}
return $n;
}
sub init_dirinfo()
{
delete $ENV{'BLOCKSIZE'};
open(my $cmd2, "/bin/df|") or print STDERR "Can't run df\n";
while (<$cmd2>) {
chomp;
if (m/^Filesystem\s+(\d+)\-blocks/) {
$blocksize = $1;
} elsif (m/^.*?\s+\d+\s+\d+\s+(\d+)\s+\d+\%\s+(\/.*?)$/) {
my ($mntpoint, $avail) = ($2, $1);
my $i = create_mntpoint($mntpoint);
next unless defined $i;
$i->{avail} = $avail;
}
}
close($cmd2) or print STDERR "Error running df: $!\n";
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+\((.*?)\))?$/) {
my ($mntpoint, $opts) = ($1, $2);
my $i = create_mntpoint($mntpoint);
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: $!\n";
}
init_dirinfo();
sub _dirstat($);
sub _dirstat($)
{
my $dname = shift;
my $dev = (stat $dname)[0];
if (!defined $dev) {
if (!defined $dirinfo->{"$dname"}) {
return $dirinfo->{"$dname"} = _dirstat(dirname($dname));
} else {
return $dirinfo->{"$dname"};
}
} else {
if (!defined $dirinfo->{"$dev"}) {
return $dirinfo->{"$dev"} = _dirstat(dirname($dname));
} else {
return $dirinfo->{"$dev"};
}
}
}
sub filestat($)
{
my $fname = shift;
my $dev = (stat $fname)[0];
if (!defined $dev) {
if (!defined $dirinfo->{"$fname"}) {
return _dirstat(dirname($fname));
} else {
return $dirinfo->{"$fname"};
}
} else {
if (!defined $dirinfo->{"$dev"}) {
return _dirstat(dirname($fname));
} else {
return $dirinfo->{"$dev"};
}
}
}
sub vexists($)
{
my $name = shift;
if (defined $virtual->{"$name"}) {
return $virtual->{"$name"};
} else {
return -e $name;
}
}
sub vreaddir($)
{
my $dirname = shift;
my %l;
my $d = gensym;
opendir($d, $dirname);
%l = map { $_ => 1 } readdir($d);
closedir($d);
if (defined $virtual_dir->{"$dirname"}) {
for my $e (@{$virtual_dir->{"$dirname"}}) {
my $n = basename($e);
if (vexists $e) {
$l{"$n"} = 1;
} else {
undef $l{"$n"};
}
}
}
return keys(%l);
}
sub account_for($$)
{
my ($name, $size) = @_;
my $e = filestat($name);
$e->{used} += $size;
return $e;
}
sub add($$)
{
my ($name, $size) = @_;
$virtual->{$name} = 1;
my $d = dirname($name);
$virtual_dir->{$d} = [] unless defined $virtual_dir->{$d};
push(@{$virtual_dir->{$d}}, $name);
return defined($size) ? account_for($name, $size) : undef;
}
sub remove($$)
{
my ($name, $size) = @_;
$virtual->{$name} = 0;
my $d = dirname($name);
$virtual_dir->{$d} = [] unless defined $virtual_dir->{$d};
push(@{$virtual_dir->{$d}}, $name);
return defined($size) ? account_for($name, -$size) : undef;
}
sub tally()
{
for my $mntpoint (@$mnts) {
if ($mntpoint->{used} != 0) {
print $mntpoint->{mnt}, ": ", $mntpoint->{used}, " bytes\n";
}
}
}
package OpenBSD::Vstat::MountPoint;
sub avail
{
my $self = $_[0];
return $self->{avail} - $self->{used}/$blocksize;
}
1;
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