summaryrefslogtreecommitdiffstats
path: root/urpm/sys.pm
blob: 91c38b0661068baa73d5e8360719d3e92fbde5cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
package urpm::sys;

# $Id$

use strict;
use warnings;
use urpm::util;
use urpm::msg;
use POSIX ();

(our $VERSION) = q($Revision$) =~ /(\d+)/;


#- get the list of packages that should not be upgraded or installed,
#- typically from the inst.list or skip.list files.
sub get_packages_list {
    my ($file, $o_extra) = @_;
    my @l = split(/,/, $o_extra || '');
    if ($file && open(my $f, '<', $file)) {
	push @l, <$f>;
    }
    [ grep { $_ } map {
	chomp; s/#.*$//; s/^\s*//; s/\s*$//;
	$_;
    } @l ];
}

#- 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 clean_rpmdb_shared_regions {
    my ($prefix) = @_;
    unlink glob("$prefix/var/lib/rpm/__db.*");
}

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;
}

sub move_or_die {
    my ($urpm, $file, $dest) = @_;
    urpm::util::move($file, $dest) or $urpm->{fatal}(1, N("Can't move file %s to %s", $file, $dest));
}

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