summaryrefslogtreecommitdiff
path: root/scripts/Dpkg/Conf.pm
blob: 5b98bbd8e44ba44f99b303a9ed511e9924efdc31 (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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
# Copyright © 2009-2010 Raphaël Hertzog <hertzog@debian.org>
#
# 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 2 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 <https://www.gnu.org/licenses/>.

package Dpkg::Conf;

use strict;
use warnings;

our $VERSION = '1.03';

use Carp;

use Dpkg::Gettext;
use Dpkg::ErrorHandling;

use parent qw(Dpkg::Interface::Storable);

use overload
    '@{}' => sub { return [ $_[0]->get_options() ] },
    fallback => 1;

=encoding utf8

=head1 NAME

Dpkg::Conf - parse dpkg configuration files

=head1 DESCRIPTION

The Dpkg::Conf object can be used to read options from a configuration
file. It can export an array that can then be parsed exactly like @ARGV.

=head1 METHODS

=over 4

=item $conf = Dpkg::Conf->new(%opts)

Create a new Dpkg::Conf object. Some options can be set through %opts:
if allow_short evaluates to true (it defaults to false), then short
options are allowed in the configuration file, they should be prepended
with a single hyphen.

=cut

sub new {
    my ($this, %opts) = @_;
    my $class = ref($this) || $this;

    my $self = {
	options => [],
	allow_short => 0,
    };
    foreach my $opt (keys %opts) {
	$self->{$opt} = $opts{$opt};
    }
    bless $self, $class;

    return $self;
}

=item @$conf

=item @options = $conf->get_options()

Returns the list of options that can be parsed like @ARGV.

=cut

sub get_options {
    my $self = shift;

    return @{$self->{options}};
}

=item get()

=item set()

Obsolete functions, use get_options() instead. They will croak.

=cut

sub get {
    croak 'obsolete function, use get_options instead';
}

sub set {
    croak 'obsolete function, use get_options instead';
}

=item $conf->load($file)

Read options from a file. Return the number of options parsed.

=item $conf->load_system_config($file)

Read options from a system configuration file.

Return the number of options parsed.

=cut

sub load_system_config {
    my ($self, $file) = @_;

    return 0 unless -e "$Dpkg::CONFDIR/$file";
    return $self->load("$Dpkg::CONFDIR/$file");
}

=item $conf->load_user_config($file)

Read options from a user configuration file. It will try to use the XDG
directory, either $XDG_CONFIG_HOME/dpkg/ or $HOME/.config/dpkg/.

Return the number of options parsed.

=cut

sub load_user_config {
    my ($self, $file) = @_;

    my $confdir = $ENV{XDG_CONFIG_HOME};
    $confdir ||= $ENV{HOME} . '/.config' if length $ENV{HOME};

    return 0 unless length $confdir;
    return 0 unless -e "$confdir/dpkg/$file";
    return $self->load("$confdir/dpkg/$file") if length $confdir;
    return 0;
}

=item $conf->load_config($file)

Read options from system and user configuration files.

Return the number of options parsed.

=cut

sub load_config {
    my ($self, $file) = @_;

    my $nopts = 0;

    $nopts += $self->load_system_config($file);
    $nopts += $self->load_user_config($file);

    return $nopts;
}

=item $conf->parse($fh)

Parse options from a file handle. When called multiple times, the parsed
options are accumulated.

Return the number of options parsed.

=cut

sub parse {
    my ($self, $fh, $desc) = @_;
    my $count = 0;
    local $_;

    while (<$fh>) {
	chomp;
	s/^\s+//;             # Strip leading spaces
	s/\s+$//;             # Strip trailing spaces
	s/\s+=\s+/=/;         # Remove spaces around the first =
	s/\s+/=/ unless m/=/; # First spaces becomes = if no =
	# Skip empty lines and comments
	next if /^#/ or length == 0;
	if (/^-[^-]/ and not $self->{allow_short}) {
	    warning(g_('short option not allowed in %s, line %d'), $desc, $.);
	    next;
	}
	if (/^([^=]+)(?:=(.*))?$/) {
	    my ($name, $value) = ($1, $2);
	    $name = "--$name" unless $name =~ /^-/;
	    if (defined $value) {
		$value =~ s/^"(.*)"$/$1/ or $value =~ s/^'(.*)'$/$1/;
		push @{$self->{options}}, "$name=$value";
	    } else {
		push @{$self->{options}}, $name;
	    }
	    $count++;
	} else {
	    warning(g_('invalid syntax for option in %s, line %d'), $desc, $.);
	}
    }
    return $count;
}

=item $conf->filter(%opts)

Filter the list of options, either removing or keeping all those that
return true when $opts{remove}->($option) or $opts{keep}->($option) is called.

=cut

sub filter {
    my ($self, %opts) = @_;
    my $remove = $opts{remove} // sub { 0 };
    my $keep = $opts{keep} // sub { 1 };

    croak 'obsolete option format_argv' if exists $opts{format_argv};

    @{$self->{options}} = grep { not $remove->($_) and $keep->($_) }
                               @{$self->{options}};
}

=item $string = $conf->output([$fh])

Write the options in the given filehandle (if defined) and return a string
representation of the content (that would be) written.

=item "$conf"

Return a string representation of the content.

=cut

sub output {
    my ($self, $fh) = @_;
    my $ret = '';
    foreach my $opt ($self->get_options()) {
	$opt =~ s/^--//;
	$opt =~ s/^([^=]+)=(.*)$/$1 = "$2"/;
	$opt .= "\n";
	print { $fh } $opt if defined $fh;
	$ret .= $opt;
    }
    return $ret;
}

=item $conf->save($file)

Save the options in a file.

=back

=head1 CHANGES

=head2 Version 1.03 (dpkg 1.18.8)

Obsolete option: 'format_argv' in $conf->filter().

Obsolete methods: $conf->get(), $conf->set().

New methods: $conf->load_system_config(), $conf->load_system_user(),
$conf->load_config().

=head2 Version 1.02 (dpkg 1.18.5)

New option: Accept new option 'format_argv' in $conf->filter().

New methods: $conf->get(), $conf->set().

=head2 Version 1.01 (dpkg 1.15.8)

New method: $conf->filter()

=head2 Version 1.00 (dpkg 1.15.6)

Mark the module as public.

=cut

1;