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package urpm::sys;
# $Id$
use strict;
use warnings;
use urpm::util;
use urpm::msg;
use POSIX ();
(our $VERSION) = q($Revision$) =~ /(\d+)/;
#- find used mount point from a pathname, use a optional mode to allow
#- filtering according the next operation (mount or umount).
sub find_mntpoints {
my ($dir, $infos) = @_;
my (%fstab, @mntpoints);
#- read /etc/fstab and check for existing mount point.
foreach (cat_("/etc/fstab")) {
next if /^\s*#/;
my ($device, $mntpoint, $fstype, $options) = m!^\s*(\S+)\s+(/\S+)\s+(\S+)\s+(\S+)!
or next;
$mntpoint =~ s,/+,/,g; $mntpoint =~ s,/$,,;
$fstab{$mntpoint} = 0;
if (ref($infos)) {
if ($fstype eq 'supermount') {
$options =~ /^(?:.*[\s,])?dev=([^\s,]+)/ and $infos->{$mntpoint} = {
mounted => 0,
device => $1,
fs => $fstype,
supermount => 1,
};
} else {
$infos->{$mntpoint} = { mounted => 0, device => $device, fs => $fstype };
}
}
}
foreach (cat_("/etc/mtab")) {
my ($device, $mntpoint, $fstype, $options) = m!^\s*(\S+)\s+(/\S+)\s+(\S+)\s+(\S+)!
or next;
$mntpoint =~ s,/+,/,g; $mntpoint =~ s,/$,,;
$fstab{$mntpoint} = 1;
if (ref($infos)) {
if ($fstype eq 'supermount') {
$options =~ /^(?:.*[\s,])?dev=([^\s,]+)/ and $infos->{$mntpoint} = {
mounted => 1,
device => $1,
fs => $fstype,
supermount => 1,
};
} else {
$infos->{$mntpoint} = { mounted => 1, device => $device, fs => $fstype };
}
}
}
#- try to follow symlink, too complex symlink graph may not be seen.
#- check the possible mount point.
my @paths = split '/', $dir;
my $pdir = '';
local $_;
while (defined ($_ = shift @paths)) {
length($_) or next;
$pdir .= "/$_";
$pdir =~ s,/+,/,g; $pdir =~ s,/$,,;
if (exists($fstab{$pdir})) {
ref($infos) and push @mntpoints, $pdir;
$infos eq 'mount' && ! $fstab{$pdir} and push @mntpoints, $pdir;
$infos eq 'umount' && $fstab{$pdir} and unshift @mntpoints, $pdir;
#- following symlinks may be useless or dangerous for supermounted devices.
#- this means it is assumed no symlink inside a removable device
#- will go outside the device itself (or at least will go into
#- regular already mounted device like /).
#- for simplification we refuse also any other device and stop here.
last;
} elsif (-l $pdir) {
while (my $v = readlink $pdir) {
if ($pdir =~ m|^/|) {
$pdir = $v;
} else {
while ($v =~ m|^\.\./(.*)|) {
$v = $1;
$pdir =~ s|^(.*)/[^/]+/*|$1|;
}
$pdir .= "/$v";
}
}
unshift @paths, split '/', $pdir;
$pdir = '';
}
}
@mntpoints;
}
sub proc_mounts() {
my @l = cat_('/proc/mounts') or warn "Can't read /proc/mounts: $!\n";
@l;
}
#- returns the first unused loop device, or an empty string if none is found.
sub first_free_loopdev () {
my %loopdevs = map { $_ => 1 } grep { ! -d $_ } glob('/dev/loop*');
foreach (proc_mounts()) {
(our $dev) = split ' ';
delete $loopdevs{$dev} if $dev =~ m!^/dev/loop!;
}
my @l = keys %loopdevs;
@l ? $l[0] : '';
}
sub trim_until_d {
my ($dir) = @_;
foreach (proc_mounts()) {
#- fail if an iso is already mounted
m!^/dev/loop! and return $dir;
}
while ($dir && !-d $dir) { $dir =~ s,/[^/]*$,, }
$dir;
}
#- checks if the main filesystems are writeable for urpmi to install files in
sub check_fs_writable () {
foreach (proc_mounts()) {
(undef, our $mountpoint, undef, my $opts) = split ' ';
if ($opts =~ /(?:^|,)ro(?:,|$)/ && $mountpoint =~ m!^(/|/usr|/s?bin)\z!) {
return 0;
}
}
1;
}
#- create a plain rpm from an installed rpm and a delta rpm (in the current directory)
#- returns the new rpm filename in case of success
#- params :
#- $deltarpm : full pathname of the deltarpm
#- $o_dir : directory where to put the produced rpm (optional)
#- $o_pkg : URPM::Package object corresponding to the deltarpm (optional)
our $APPLYDELTARPM = '/usr/bin/applydeltarpm';
sub apply_delta_rpm {
my ($deltarpm, $o_dir, $o_pkg) = @_;
-x $APPLYDELTARPM or return 0;
-e $deltarpm or return 0;
my $rpm;
if ($o_pkg) {
require URPM; #- help perl_checker
$rpm = $o_pkg->name . '-' . $o_pkg->version . '-' . $o_pkg->release . '.' . $o_pkg->arch . '.rpm';
} else {
$rpm = `rpm -qp --qf '%{name}-%{version}-%{release}.%{arch}.rpm' '$deltarpm'`;
}
$rpm or return 0;
$rpm = $o_dir . '/' . $rpm;
unlink $rpm;
system($APPLYDELTARPM, $deltarpm, $rpm);
-e $rpm ? $rpm : '';
}
our $tempdir_template = '/tmp/urpm.XXXXXX';
sub mktempdir() {
my $tmpdir;
eval { require File::Temp };
if ($@) {
#- fall back to external command (File::Temp not in perl-base)
$tmpdir = `mktemp -d $tempdir_template`;
chomp $tmpdir;
} else {
$tmpdir = File::Temp::tempdir($tempdir_template);
}
return $tmpdir;
}
# temporary hack used by urpmi when restarting itself.
sub fix_fd_leak() {
opendir my $dirh, "/proc/$$/fd" or return undef;
my @fds = grep { /^(\d+)$/ && $1 > 2 } readdir $dirh;
closedir $dirh;
foreach (@fds) {
my $link = readlink("/proc/$$/fd/$_");
$link or next;
next if $link =~ m!^/(usr|dev)/! || $link !~ m!^/!;
POSIX::close($_);
}
}
sub clean_dir {
my ($dir) = @_;
require File::Path;
File::Path::rmtree([$dir]);
mkdir $dir, 0755;
}
sub syserror {
my ($urpm, $msg, $info) = @_;
$urpm->{error}("$msg [$info] [$!]");
}
sub open_safe {
my ($urpm, $sense, $filename) = @_;
open my $f, $sense, $filename
or syserror($urpm, $sense eq '>' ? N("Can't write file") : N("Can't open file"), $filename), return undef;
return $f;
}
sub opendir_safe {
my ($urpm, $dirname) = @_;
opendir my $d, $dirname
or syserror($urpm, "Can't open directory", $dirname), return undef;
return $d;
}
1;
__END__
=head1 NAME
urpm::sys - OS-related routines for urpmi
=head1 SYNOPSIS
=head1 DESCRIPTION
=head1 COPYRIGHT
Copyright (C) 2005 MandrakeSoft SA
Copyright (C) 2005 Mandriva SA
=cut
|
