summaryrefslogtreecommitdiff
path: root/dh_makeshlibs
blob: 776e66f0b8b5f229259d87cb6a5d6ce0c1e0ec03 (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
#!/usr/bin/perl -w

=head1 NAME

dh_makeshlibs - automatically create shlibs file and call dpkg-gensymbols

=cut

use strict;
use Debian::Debhelper::Dh_Lib;

=head1 SYNOPSIS

B<dh_makeshlibs> [S<I<debhelper options>>] [B<-m>I<major>] [B<-V>I<[dependencies]>] [B<-n>] [B<-X>I<item>] [S<B<--> I<params>>]

=head1 DESCRIPTION

dh_makeshlibs is a debhelper program that automatically scans for shared
libraries, and generates a shlibs file for the libraries it finds.

It also adds a call to ldconfig in the postinst and postrm scripts (in
V3 mode and above only) to any packages in which it finds shared libraries.

If a L<dpkg-gensymbols(1)> symbol file is found in debian/package.symbols
(or debian/package.symbols.arch), dpkg-gensymbols will be called
to process and install the symbols file.

=head1 OPTIONS

=over 4

=item B<-m>I<major>, B<--major=>I<major>

Instead of trying to guess the major number of the library with objdump,
use the major number specified after the -m parameter. This is much less
useful than it used to be, back in the bad old days when this program
looked at library filenames rather than using objdump.

=item B<-V>, B<-V>I<dependencies>

=item B<--version-info>, B<--version-info=>I<dependencies>

By default, the shlibs file generated by this program does not make packages
depend on any particular version of the package containing the shared
library. It may be necessary for you to add some version dependancy
information to the shlibs file. If -V is specified with no dependency
information, the current upstream version of the package is plugged into a
dependency that looks like "packagename (>= packageversion)". Note that in
debhelper compatibility levels before v4, the debian part of the package
version number is also included. If -V is specified with parameters, the
parameters can be used to specify the exact dependency information needed
(be sure to include the package name).

Beware of using -V without any parameters; this is a conservative setting
that always ensures that other packages' shared library dependencies are at
least as tight as they need to be (unless your library is prone to changing
ABI without updating the upstream version number), so that if the
maintainer screws up then they won't break. The flip side is that packages
might end up with dependencies that are too tight and so find it harder to
be upgraded.

=item B<-n>, B<--noscripts>

Do not modify postinst/postrm scripts.

=item B<-X>I<item>, B<--exclude=>I<item>

Exclude files that contain "item" anywhere in their filename or directory 
from being treated as shared libraries.

=item B<--add-udeb=>I<udeb>

Create an additional line for udebs in the shlibs file and use "udeb" as the
package name for udebs to depend on instead of the regular library package.

=item B<--> I<params>

Pass "params" to L<dpkg-gensymbols(1)>.

=back

=head1 EXAMPLES

=over 4

=item dh_makeshlibs

Assuming this is a package named libfoobar1, generates a shlibs file that
looks something like:
 libfoobar 1 libfoobar1

=item dh_makeshlibs -V

Assuming the current version of the package is 1.1-3, generates a shlibs
file that looks something like:
 libfoobar 1 libfoobar1 (>= 1.1)

=item dh_makeshlibs -V 'libfoobar1 (>= 1.0)'

Generates a shlibs file that looks something like:
  libfoobar 1 libfoobar1 (>= 1.0)

=back

=cut

init(options => {
	"m=s", => \$dh{M_PARAMS},
	"major=s" => \$dh{M_PARAMS},
	"version-info:s" => \$dh{V_FLAG},
	"add-udeb=s" => \$dh{SHLIBS_UDEB},
});

foreach my $package (@{$dh{DOPACKAGES}}) {
	next if is_udeb($package);
	
	my $tmp=tmpdir($package);

	my %seen;
	my $need_ldconfig = 0;

	doit("rm", "-f", "$tmp/DEBIAN/shlibs");

	# So, we look for files or links to existing files with names that
	# match "*.so*". Matching *.so.* is not good enough because of
	# broken crap like db3. And we only look at real files not
	# symlinks, so we don't accidentually add shlibs data to -dev
	# packages. This may have a few false positives, which is ok,
	# because only if we can get a library name and a major number from
	# objdump is anything actually added.
	my $exclude='';
	my @udeb_lines;
	if (defined($dh{EXCLUDE_FIND}) && $dh{EXCLUDE_FIND} ne '') {
		$exclude="! \\( $dh{EXCLUDE_FIND} \\) ";
	}
	open (FIND, "find $tmp -type f \\( -name '*.so' -or -name '*.so.*' \\) $exclude |");
	while (<FIND>) {
		my ($library, $major);
		my $objdump=`objdump -p $_`;
		if ($objdump=~m/\s+SONAME\s+(.+)\.so\.(.+)/) {
			# proper soname format
			$library=$1;
			$major=$2;
		}
		elsif ($objdump=~m/\s+SONAME\s+(.+)-(.+)\.so/) {
			# idiotic crap soname format
			$library=$1;
			$major=$2;
		}

		if (defined($dh{M_PARAMS}) && $dh{M_PARAMS} ne '') {
			$major=$dh{M_PARAMS};
		}
		
		if (! -d "$tmp/DEBIAN") {
			doit("install","-d","$tmp/DEBIAN");
		}
		my $deps=$package;
		if ($dh{V_FLAG_SET}) {
			if ($dh{V_FLAG} ne '') {
				$deps=$dh{V_FLAG};
			}	
			else {
				# Call isnative becuase it sets $dh{VERSION}
				# as a side effect.
				isnative($package);
				my $version = $dh{VERSION};
				# Old compatibility levels include the
				# debian revision, while new do not.
				if (! compat(3)) {
					# Remove debian version, if any.
					$version =~ s/-[^-]+$//;
				}
				$deps="$package (>= $version)";
			}
		}
		if (defined($library) && defined($major) && defined($deps) &&
		    $library ne '' && $major ne '' && $deps ne '') {
		    	$need_ldconfig=1;
		    	# Prevent duplicate lines from entering the file.
		    	my $line="$library $major $deps";
			if (! $seen{$line}) {
				$seen{$line}=1;
				complex_doit("echo '$line' >>$tmp/DEBIAN/shlibs");
				if (defined($dh{SHLIBS_UDEB}) && $dh{SHLIBS_UDEB} ne '') {
					my $udeb_deps = $deps;
					$udeb_deps =~ s/\Q$package\E/$dh{SHLIBS_UDEB}/e;
			    		$line="udeb: "."$library $major $udeb_deps";
					push @udeb_lines, $line;
				}
			}
		}
	}
	close FIND;

	# Write udeb: lines last.
	foreach (@udeb_lines) {
		complex_doit("echo '$_' >>$tmp/DEBIAN/shlibs");
	}

	# New as of dh_v3.
	if (! compat(2) && ! $dh{NOSCRIPTS} && $need_ldconfig) {
		autoscript($package,"postinst","postinst-makeshlibs");
		autoscript($package,"postrm","postrm-makeshlibs");
	}

	if (-e "$tmp/DEBIAN/shlibs") {
		doit("chmod",644,"$tmp/DEBIAN/shlibs");
		doit("chown","0:0","$tmp/DEBIAN/shlibs");
	}

	# dpkg-gensymbols files
	my $symbols=pkgfile($package, "symbols");
	if (-e $symbols) {
		# -I is used rather than using dpkg-gensymbols
		# own search for symbols files, since that search
		# is not 100% compatible with debhelper. (For example,
		# this supports --ignore being used.)
		doit("dpkg-gensymbols", "-p$package", "-I$symbols",
			"-P$tmp", @{$dh{U_PARAMS}});
		if (-s "$tmp/DEBIAN/symbols" == 0) {
			doit("rm", "-f", "$tmp/DEBIAN/symbols");
		}
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut