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#!/usr/bin/perl -w
# Copyright (C) 2010 Modestas Vainius <modax@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 3 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 <http://www.gnu.org/licenses/>
=head1 NAME
dh_sameversiondep - generate versioned dependency based on the versioned
dependencies of the reference package.
=head1 SYNOPSIS
B<dh_sameversiondep> [S<I<debhelper options>>]
=head1 DESCRIPTION
B<dh_sameversiondep> is a helper tool which is able to generate a dependency
that is versioned the same way as a dependency (coming from the same source) of
another reference package. B<dh_sameversiondep> scans debian/control for the
specially formatted substvar (see L</sameVersionDep substvar SPECIFICATION>
section below), determines its value and writes it to
F<debian/package.substvars> file.
The most common use case for B<dh_sameversiondep> tool is to keep your
I<liba-dev> package dependency on the external I<libb-dev> package as tight as
your I<liba> package depends on the respective external I<libb> package (see
L</EXAMPLE> section for more information about this use case).
B<dh_sameversiondep> works as follows:
=over 4
=item *
Searches for the B<sameVersionDep> substvar in the Depends, Recommends,
Suggests, Enhances and Pre-Depends fields of the requested packages. When one
is found, it is parsed and the I<dependency package> name, I<reference package>
name and I<dependency type> (either Depends or Recommends etc.) are determined.
=item *
All dependencies of the requested I<type> are collected for the I<dependency
package> based on the I<dpkg-query --status> output. If a multi-arch aware dpkg
is detected, this query is architecture-qualified as needed.
=item *
All dependencies of the requested I<type> are collected for the I<reference
package> either from F<debian/control> (substvars are expanded) or from
I<dpkg-query --status> output if the package was not found in
F<debian/control>.
=item *
Both collections are intersected leaving only common packages in both
collections.
=item *
Common package list is filtered by leaving only those which come from the same
source as I<dependency package>.
=item *
Whatever packages are left (most likely only one), their names are replaced
with I<dependency package> name preserving all versioning information. This
result is written to F<debian/package.substvars> file as a value of the
B<sameVersionDep> substvar being processed.
=back
B<dh_sameversiondep> is very strict about errors. If either I<dependency
package> or the I<reference package> cannot be found or the resulting
dependency set is empty, it will fail with an error.
B<dh_sameversiondep> MUST be run before L<dh_gencontrol>. However, it is
recommended to run B<dh_sameversiondep> after L<dh_shlibdeps>.
=head1 sameVersionDep substvar SPECIFICATION
B<sameVersionDep> substvar can appear in either Depends, Recommends, Suggests,
Enhances or Pre-Depends field of any binary package. The field, which the
substvar appears in, becomes the default I<dependency type> for that substvar.
B<sameVersionDep> should be formatted as follows (everything is case sensitive):
S<< ${B<sameVersionDep>:I<dependency>[[:I<reference>]-I<dependency type>]} >>
=over 4
=item I<dependency> (mandatory)
The name of the package which you want to add as a dependency.
=item I<reference> (optional)
The name of the package which dependencies are to be intersected with the
dependencies of the I<dependency> package. Defaults to the first package in
debian/control if omitted.
=item I<dependency type> (optional)
Can be either Depends, Recommends, Suggests, Enhances or Pre-Depends. Defaults
to the name of the field which the substvar was found in. Specifies which type
of dependencies to consider when analyzing I<dependency> package and
I<reference> package.
=back
=head1 EXAMPLE
Assume we have the following in F<debian/control>:
Package: liba
Depends: libc (>= 0.1), depa, depb, depc
Package: libb
Depends: libd (>= 0.2), depd, depe, depf
Package: libab-dev
Depends: ${sameVersionDep:libc-dev}, ${sameVersionDep:libd-dev:libb}
Assumming that libc and libc-dev (both from the same source), as well as libd
and libd-dev (both from the same source) are installed, the value of
C<sameVersionDep:libc-dev> will be I<< libc-dev (>= 0.1) >> and the value of
C<sameVersionDep:libd-dev:libb> will be I<< libd-dev (>= 0.2) >>.
C<sameVersionDep:libc-dev> could also be written as
C<sameVersionDep:libc-dev:liba-Depends> and C<sameVersionDep:libd-dev:libb> as
C<sameVersionDep:libd-dev:libb-Depends> but it is not necessary because
defaults are sufficient.
=head1 SEE ALSO
L<debhelper(7)>
=head1 AUTHOR
Modestas Vainius <modax@debian.org>
=cut
use strict;
use warnings;
use Dpkg::Control::Info;
use Dpkg::Substvars;
use Dpkg::ErrorHandling ();
use File::Copy;
use POSIX ":sys_wait_h";
use Debian::Debhelper::Dh_Lib;
my $namespace = "sameVersionDep";
my @fields = qw(Depends Recommends Suggests Enhances Pre-Depends);
my $re_fields = join("|", @fields);
my $re_pkgname = qr/[a-z0-9][a-z0-9+.-]*/;
my $re_oursubstvar = qr/\$\{($namespace:(.*?))\}/;
my $re_splitsubstvar = qr/^($re_pkgname)(?::($re_pkgname))?(?:-($re_fields))?$/;
# Global substvars file
my $g_substvars = new Dpkg::Substvars;
$g_substvars->load("debian/substvars") if (-r "debian/substvars");
my $MULTIARCH_ARCH;
sub extract_package_names {
my $val = shift;
$val =~ s/\([^)]+\)//g;
$val =~ s/^\s+//;
$val =~ s/\s+$//;
return split(/\s*,\s*/, $val);
}
sub extract_deps {
my ($val, $deppkg) = @_;
# Extract dependency fields we need
my @matched_deps;
for my $dep (split(/\s*,\s*/, $val)) {
if ($dep =~ /^\Q$deppkg\E(?:$|[\W])/) {
push @matched_deps, $dep;
}
}
return @matched_deps;
}
sub Shlibsvars::new {
my ($cls, $package, $control, $substvars_file) = @_;
my $self = bless ( {
"package" => $package,
"control" => $control,
"file" => $substvars_file,
}, $cls);
$self->{substvars} = new Dpkg::Substvars;
if (-r $self->{file}) {
$self->{substvars}->load($self->{file});
}
return $self;
}
sub Shlibsvars::get_fieldval {
my ($self, $field) = @_;
my $pkg = $self->{control}->get_pkg_by_name($self->{package});
return undef if (!defined $pkg || !exists $pkg->{$field});
# Turn of warnings for substvars runs
Dpkg::ErrorHandling::report_options(quiet_warnings => 1);
my $val = $pkg->{$field};
$val = $self->{substvars}->substvars($val);
$val = $g_substvars->substvars($val);
Dpkg::ErrorHandling::report_options(quiet_warnings => 0);
return $val;
}
sub Shlibsvars::extract_deps {
my ($self, $field, $deppkg) = @_;
my $val = $self->get_fieldval($field);
return undef() unless defined $val;
return extract_deps($val, $deppkg);
}
sub Shlibsvars::get_dep_package_names {
my ($self, $field) = @_;
my $val = $self->get_fieldval($field);
return undef() unless defined $val;
return extract_package_names($val);
}
sub supports_multiarch {
if (!defined $MULTIARCH_ARCH) {
my $multiarch_assert = system('dpkg', '--assert-multi-arch');
if ($multiarch_assert == 0) {
$MULTIARCH_ARCH = dpkg_architecture_value('DEB_HOST_ARCH');
} else {
$MULTIARCH_ARCH = ""; # empty indicates no multiarch support
}
}
return $MULTIARCH_ARCH ne "";
}
sub arch_qualify {
if (supports_multiarch()) {
return map { "$_:$MULTIARCH_ARCH" } @_;
} else {
return @_;
}
}
sub execute_dpkg_status {
my $binpkgs = shift;
my $fields = shift;
$fields = [ "Source", "Version" ] unless defined $fields;
my $status = shift;
my $regexp_fields = join("|", @$fields);
my $pid = open(DPKG, "-|");
error("cannot fork for dpkg-query --status") unless defined($pid);
if (!$pid) {
# Child process running dpkg-query --status and discarding errors
close STDERR;
open STDERR, ">", "/dev/null";
$ENV{LC_ALL} = "C";
exec("dpkg-query", "--status", "--", @$binpkgs) or error("cannot exec dpkg-query");
}
my $curpkg;
while (defined($_ = <DPKG>)) {
if (m/^Package:\s*(.*)$/) {
$curpkg = $1;
$status->{$curpkg} = {};
} elsif (defined($curpkg)) {
if (m/^($regexp_fields):\s*(.*)$/) {
my $field = $1;
error("dublicate field $field for the $curpkg package in the dpkg status file")
if (exists $status->{$curpkg}{$field});
$status->{$curpkg}{$field} = $2;
}
}
}
close(DPKG);
my $exit_code = $?;
if (WIFEXITED($exit_code)) {
return WEXITSTATUS($exit_code);
} else {
error("failed to terminate dpkg --status process PID $pid");
}
}
sub get_package_dpkg_status {
my $binpkgs = shift;
my $fields = shift;
my %status;
my $exit_code = execute_dpkg_status($binpkgs, $fields, \%status);
if ($exit_code == 2 && supports_multiarch()) {
# Most likely dpkg-query --status failed due to some of package names
# being ambiguous on this system. So just requery them using
# arch-qualified syntax.
# NOTE: we have to query twice since arch-qualified syntax won't find
# arch:all packages.
my @ambiguous_pkgs = arch_qualify(grep { ! exists $status{$_} } @$binpkgs);
if (@ambiguous_pkgs) {
execute_dpkg_status(\@ambiguous_pkgs, $fields, \%status);
}
}
return \%status;
}
sub write_substvar($$$$) {
my ($pkgname, $varname, $value, $substvars) = @_;
my @contents;
my $varset = 0;
my $file = (-r $substvars) ? $substvars : "debian/substvars";
if (-r $file) {
open(FILE, "<$file") or die "Unable to open substvars file '$file' for reading\n";
while (<FILE>) {
if (!$varset && /^\s*\Q$varname=\E/) {
push @contents, "$varname=$value\n";
$varset = 1;
} else {
push @contents, $_;
}
}
close(FILE);
} else {
# Fallback to default
$file = $substvars;
}
open(FILE, ">$file.tmp") or die "Unable to open substvars file '$file.tmp' for writing\n";
for (@contents) {
print FILE $_;
}
if (!$varset) {
print FILE "$varname=$value", "\n";
}
close(FILE);
File::Copy::move("$file.tmp", "$file");
}
init();
my $control = Dpkg::Control::Info->new();
my %shlibsvars;
foreach my $package (@{$dh{DOPACKAGES}}) {
my $pkg_substvars = sprintf("debian/%ssubstvars", pkgext($package));
my $pkg = $control->get_pkg_by_name($package);
for my $fieldname (@fields) {
if (exists $pkg->{$fieldname}) {
my $fieldval = $pkg->{$fieldname};
my $pkgname = $pkg->{Package};
while ($fieldval =~ m/\G.*?$re_oursubstvar/gs) {
my $varname = $1;
my $varparams = $2;
if ($varparams =~ m/$re_splitsubstvar/) {
my $dep2add = $1;
# Scan package default to MAINPACKAGE.
my $refpkg = $2;
$refpkg = $dh{MAINPACKAGE} unless defined $refpkg;
my $deptype = $3;
$deptype = $fieldname unless defined $deptype;
# Initialize some dep2add and refpkg data.
# refpkg might also come from external source. Use dpkg-query
# to get its dpkg status then.
my $refpkg_status;
my $dep2add_status;
my $vars;
if ($control->get_pkg_by_name($refpkg)) {
if (!exists $shlibsvars{$refpkg}) {
my $refpkg_substvars = sprintf("debian/%ssubstvars", pkgext($refpkg));
$shlibsvars{$refpkg} = new Shlibsvars($refpkg, $control, $refpkg_substvars);
}
$vars = $shlibsvars{$refpkg};
$dep2add_status = get_package_dpkg_status( [ $dep2add ], [ "Source", "Version", $deptype ] );
} else {
my $status = get_package_dpkg_status( [ $refpkg, $dep2add ], [ "Source", "Version", $deptype ] );
error("cannot continue because the reference package $refpkg could not be found in debian/control or dpkg status")
unless (exists $status->{$refpkg});
error("cannot continue because package $refpkg has no $deptype field to scan")
unless (exists $status->{$refpkg}{$deptype});
$refpkg_status = $status->{$refpkg};
$dep2add_status = $status; # see code below
}
##### Process and verify dep2add status #####
error("cannot continue because package $dep2add could not be found in dpkg status")
unless (exists $dep2add_status->{$dep2add});
$dep2add_status = $dep2add_status->{$dep2add};
# If the source is named the same as the binary package, there
# will be no Source field. Use package name as Source then.
$dep2add_status->{Source} = $dep2add
unless ($dep2add_status->{Source});
# Check validility of dep2add status
error("could not retreive source package name for $dep2add package. Is it installed?")
unless exists $dep2add_status->{Source} && exists $dep2add_status->{Version};
error("package $dep2add has no $deptype field. This configuration is unsupported. ")
unless exists $dep2add_status->{$deptype};
my @dep2add_deps = extract_package_names($dep2add_status->{$deptype});
# Get deptype packages of refpkg
my @refpkg_deps;
if ($vars) {
@refpkg_deps = $vars->get_dep_package_names($deptype);
} else {
@refpkg_deps = extract_package_names($refpkg_status->{$deptype});
}
error("cannot continue because package $refpkg has no $deptype field to scan")
unless (@refpkg_deps);
# Intersect both _deps arrays to find common dependencies
my @commondeps;
{
my %_map;
map { $_map{$_} = 1; } @refpkg_deps;
map { push @commondeps, $_ if exists $_map{$_} } @dep2add_deps;
}
# Get status information about common packages. They need to come from the
# same source package as dep2add package and their versions should match
my $depstatus = get_package_dpkg_status(\@commondeps, [ "Source", "Version" ]);
# Check if all packages were found
for my $dep (@commondeps) {
error("package $dep was not found in the dpkg status. Internal error")
unless exists $depstatus->{$dep};
}
# Filter commondeps
@commondeps = ();
while (my ($pkg, $status) = each(%$depstatus)) {
# If the source is named the same as the binary package, there
# will be no Source field. Use package name as Source then.
$status->{Source} = $pkg unless ($status->{Source});
push @commondeps, $pkg
if (exists $status->{Source} && exists $status->{Version} &&
($status->{Source} eq $dep2add_status->{Source}) &&
($status->{Version} eq $dep2add_status->{Version}));
}
# Ideally we should have got the list down to one. if not, combine
# version relationships
my @fulldeps;
if (!@commondeps) {
error("$0: no same version dependencies for '$varname' found (at $fieldname of the $package package)");
} else {
my $refpkg_deptypeval = ($vars) ? $vars->get_fieldval($deptype) :
$refpkg_status->{$deptype};
for my $deppkg (@commondeps) {
my @full_dep_spec = extract_deps($refpkg_deptypeval, $deppkg);
map s/\b\Q$deppkg\E\b/$dep2add/g, @full_dep_spec;
push @fulldeps, @full_dep_spec;
}
# Drop dupes
@fulldeps = sort @fulldeps;
my @uniqdeps;
my $_prevdep;
for my $dep (@fulldeps) {
my $tmp = "$dep";
$tmp =~ s/\s//g;
push @uniqdeps, $dep if (!defined $_prevdep || $_prevdep ne $tmp);
$_prevdep = $tmp;
}
# Write substvar for the package
write_substvar($pkgname, $varname, join(", ", @uniqdeps), $pkg_substvars);
}
} else {
error("invalid '$namespace' substvar syntax: $varparams");
}
}
}
}
}
exit 0
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