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#!/usr/bin/perl
# Debian task selector, mark II.
# Copyright 2004-2011 by Joey Hess <joeyh@debian.org>.
# Licensed under the GPL, version 2 or higher.
use 5.014;
use Locale::gettext;
use Getopt::Long;
use POSIX qw(floor);
use warnings;
use strict;
textdomain('tasksel');
my $debconf_helper="/usr/lib/tasksel/tasksel-debconf";
my $filter_tasks="/usr/lib/tasksel/filter-tasks";
my $testdir="/usr/lib/tasksel/tests";
my $packagesdir="/usr/lib/tasksel/packages";
my $descdir="/usr/share/tasksel/descs";
my $localdescdir="/usr/local/share/tasksel/descs";
my $statusfile="/var/lib/dpkg/status";
my $infodir="/usr/lib/tasksel/info";
my $testmode=0;
my $taskpackageprefix="task-";
sub warning {
print STDERR "tasksel: @_\n";
}
sub error {
print STDERR "tasksel: @_\n";
exit 1;
}
# Run a shell command except in test mode, and returns its exit code.
# Prints the command in test mode. Parameters should be pre-split for
# system.
sub run {
if ($testmode) {
print join(" ", @_)."\n";
return 0;
}
else {
return system(@_) >> 8;
}
}
# A list of all available task desc files.
sub list_task_descs {
return glob("$descdir/*.desc"), glob("$localdescdir/*.desc");
}
# Returns a list of hashes; hash values are arrays for multi-line fields.
sub read_task_desc {
my $desc=shift;
my %tasks;
open (DESC, "<$desc") || die "read $desc\: $!";
local $/="\n\n";
while (<DESC>) {
my %data;
my @lines=split("\n");
while (@lines) {
my $line=shift(@lines);
if ($line=~/^([^ ]+):(?: (.*))?/) {
my ($key, $value)=($1, $2);
$key=lc($key);
if (@lines && $lines[0] =~ /^\s+/) {
# multi-line field
my @values;
if (defined $value && length $value) {
push @values, $value;
}
while (@lines && $lines[0] =~ /^\s+(.*)/) {
push @values, $1;
shift @lines;
}
$data{$key}=[@values];
}
else {
$data{$key}=$value;
}
}
else {
warning "parse error in stanza $. of $desc";
}
}
$data{relevance}=5 unless exists $data{relevance};
if (exists $data{task}) {
$tasks{$data{task}} = \%data;
}
}
close DESC;
my @ret;
foreach my $task (keys %tasks) {
my $t=$tasks{$task};
if (exists $t->{parent} && exists $tasks{$t->{parent}}) {
$t->{sortkey}=$tasks{$t->{parent}}->{relevance}.$t->{parent}."-0".$t->{relevance};
}
else {
$t->{sortkey}=$t->{relevance}.$t->{task}."-00";
}
push @ret, $t;
}
return @ret;
}
# Loads info for all tasks, and returns a set of task structures.
sub all_tasks {
my %seen;
grep { $seen{$_->{task}}++; $seen{$_->{task}} < 2 }
map { read_task_desc($_) } list_task_descs();
}
sub _info_avail {
my %ret = ();
# Might be better to use the perl apt bindings, but they are not
# currently in base.
open (AVAIL, "apt-cache dumpavail|");
local $_;
my ($package, $section, $priority);
while (<AVAIL>) {
chomp;
if (not $_) {
if (defined $package && defined $priority && defined $section) {
$ret{$package} = {
"priority" => $priority,
"section" => $section,
};
}
}
elsif (/^Package: (.*)/) {
$package = $1;
}
elsif (/^Priority: (.*)/) {
$priority = $1;
}
elsif (/^Section: (.*)/) {
$section = $1;
}
}
close AVAIL;
return %ret;
}
# Returns a list of all installed packages.
sub list_installed {
my @list;
open (LIST, q{LANG=C dpkg-query -W -f='${Package} ${Status}\n' |});
while (<LIST>) {
if (/^([^ ]+) .* installed$/m) {
push @list, $1;
}
}
close LIST;
return @list;
}
my %_info_avail_cache;
# Returns a hash of all available packages.
sub info_avail {
my $package = shift;
if (!%_info_avail_cache) {
%_info_avail_cache = _info_avail();
}
return \%_info_avail_cache;
}
# Given a package name, checks to see if it's available. Memoised.
sub package_avail {
my $package = shift;
return info_avail()->{$package} || package_installed($package);
}
my %installed_pkgs;
# Given a package name, checks to see if it's installed. Memoised.
sub package_installed {
my $package=shift;
if (! %installed_pkgs) {
foreach my $pkg (list_installed()) {
$installed_pkgs{$pkg} = 1;
}
}
return $installed_pkgs{$package};
}
# Given a task hash, checks if its key packages are available.
sub task_avail {
local $_;
my $task=shift;
if (! ref $task->{key}) {
return 1;
}
else {
foreach my $pkg (@{$task->{key}}) {
if (! package_avail($pkg)) {
return 0;
}
}
return 1;
}
}
# Given a task hash, checks to see if it is already installed.
# (All of its key packages must be installed.)
sub task_installed {
local $_;
my $task=shift;
if (! ref $task->{key}) {
return 0; # can't tell with no key packages
}
else {
foreach my $pkg (@{$task->{key}}) {
if (! package_installed($pkg)) {
return 0;
}
}
return 1;
}
}
# Given a task hash, checks to see if apt-get will be able to install it.
# Memoised.
my %existing_apt_tasks;
sub task_exists {
my $task=shift;
if (! %existing_apt_tasks) {
local $/="\n\n";
open (AVAIL, "apt-cache dumpavail|");
while (<AVAIL>) {
if (/^Task: (.*)/m) {
my @tasks=split(", ", $1);
for my $existing_task (@tasks) {
$existing_apt_tasks{$existing_task}=1;
}
}
}
close AVAIL;
}
return $existing_apt_tasks{$task->{task}};
}
# Given task hash, returns a list of all available packages in the task.
sub task_packages {
my $task=shift;
my %list;
# key packages are always included
if (ref $task->{key}) {
map { $list{$_}=1 } @{$task->{key}};
}
if (! defined $task->{packages}) {
# only key
}
elsif ($task->{packages} eq 'task-fields') {
# task-fields method is built-in for speed and to support
# aptitude/apt-get task definitions
if (task_exists($task)) {
return $task->{task}.'^';
} else {
return;
}
}
elsif ($task->{packages} eq 'standard') {
my %info_avail=%{info_avail()};
while (my ($package, $info) = each(%info_avail)) {
my ($priority, $section) = ($info->{priority}, $info->{section});
if (($priority eq 'required' ||
$priority eq 'important' ||
$priority eq 'standard') &&
# Exclude packages in non-main and library sections
$section !~ /^lib|\// &&
# Exclude already installed packages
!package_installed($package)) {
$list{$package} = 1;
}
}
}
else {
# external method
my ($method, @params);
if (ref $task->{packages}) {
@params=@{$task->{packages}};
$method=shift @params;
}
else {
$method=$task->{packages};
}
map { $list{$_}=1 }
grep { package_avail($_) }
split(' ', `$packagesdir/$method $task->{task} @params`);
}
return keys %list;
}
# Given a task hash, runs any test program specified in its data, and sets
# the _display and _install fields to 1 or 0 depending on its result.
sub task_test {
my $task=shift;
my $new_install=shift;
$task->{_display} = shift; # default
$task->{_install} = shift; # default
$ENV{NEW_INSTALL}=$new_install if defined $new_install;
foreach my $test (grep /^test-.*/, keys %$task) {
$test=~s/^test-//;
if (-x "$testdir/$test") {
my $ret=system("$testdir/$test", $task->{task}, split " ", $task->{"test-$test"}) >> 8;
if ($ret == 0) {
$task->{_display} = 0;
$task->{_install} = 1;
}
elsif ($ret == 1) {
$task->{_display} = 0;
$task->{_install} = 0;
}
elsif ($ret == 2) {
$task->{_display} = 1;
$task->{_install} = 1;
}
elsif ($ret == 3) {
$task->{_display} = 1;
$task->{_install} = 0;
}
}
}
delete $ENV{NEW_INSTALL};
return $task;
}
# Given a list of task hashes, adjust their statuses according to
# tasksel/force-tasks, tasksel/limit-tasks, and tasksel/skip-tasks.
sub filter_tasks {
my %tasks=map { $_->{task} => $_ } @_;
my $tmpfile=`tempfile`;
chomp $tmpfile;
my $ret=system($filter_tasks, $tmpfile, sort keys %tasks) >> 8;
if ($ret != 0) {
error "filter-tasks failed to run";
}
open(IN, "<$tmpfile") or return;
for my $line (<IN>) {
chomp $line;
$line=~/(.*?) (install|skip)/ or next;
my $name=$1;
my $action=$2;
if ($action eq 'install') {
$tasks{$name}{_display} = 0;
$tasks{$name}{_install} = 1;
}
elsif ($action eq 'skip') {
$tasks{$name}{_display} = 0;
$tasks{$name}{_install} = 0;
}
}
close IN;
unlink $tmpfile;
}
# Hides a task and marks it not to be installed if it enhances other
# tasks.
sub hide_enhancing_tasks {
my $task=shift;
if (exists $task->{enhances} && length $task->{enhances}) {
$task->{_display} = 0;
}
return $task;
}
# Looks up the descriptions of a set of tasks, returning a new list
# with the shortdesc fields filled in.
sub getdescriptions {
my @tasks=@_;
# If the task has a description field in the task desc file,
# just use it, looking up a translation in gettext.
@tasks = map {
if (defined $_->{description}) {
$_->{shortdesc}=dgettext("debian-tasks", $_->{description}->[0]);
}
$_;
} @tasks;
# Otherwise, a more expensive apt-cache query is done,
# to use the descriptions of task packages.
my @todo = grep { ! defined $_->{shortdesc} } @tasks;
if (@todo) {
open(APT_CACHE, "apt-cache show ".join(" ", map { $taskpackageprefix.$_->{task} } @todo)." |") || die "apt-cache show: $!";
local $/="\n\n";
while (<APT_CACHE>) {
my ($name)=/^Package: $taskpackageprefix(.*)$/m;
my ($description)=/^Description-(?:[a-z][a-z](?:_[A-Z][A-Z])?): (.*)$/m;
($description)=/^Description: (.*)$/m
unless defined $description;
if (defined $name && defined $description) {
@tasks = map {
if ($_->{task} eq $name) {
$_->{shortdesc}=$description;
}
$_;
} @tasks;
}
}
close APT_CACHE;
}
return @tasks;
}
# Converts a list of tasks into a debconf list of the task short
# descriptions.
sub task_to_debconf {
join ", ", map { format_description_for_debconf($_) } getdescriptions(@_);
}
sub format_description_for_debconf {
my $task=shift;
my $d=$task->{shortdesc};
$d=~s/,/\\,/g;
$d="... ".$d if exists $task->{parent};
return $d;
}
# Converts a list of tasks into a debconf list of the task names.
sub task_to_debconf_C {
join ", ", map { $_->{task} } @_;
}
# Given a first parameter that is a string listing task names, and then a
# list of task hashes, returns a list of hashes for all the tasks
# in the list.
sub list_to_tasks {
my $list=shift;
my %lookup = map { $_->{task} => $_ } @_;
return grep { defined } map { $lookup{$_} } split /[, ]+/, $list;
}
# Orders a list of tasks for display.
sub order_for_display {
sort {
$a->{sortkey} cmp $b->{sortkey}
|| 0 ||
$a->{task} cmp $b->{task}
} @_;
}
# Given a set of tasks and a name, returns the one with that name.
sub name_to_task {
my $name=shift;
return (grep { $_->{task} eq $name } @_)[0];
}
sub task_script {
my $task=shift;
my $script=shift;
my $path="$infodir/$task.$script";
if (-e $path && -x _) {
my $ret=run($path);
if ($ret != 0) {
warning("$path exited with nonzero code $ret");
return 0;
}
}
return 1;
}
sub usage {
print STDERR gettext(q{Usage:
tasksel install <task>...
tasksel remove <task>...
tasksel [options]
-t, --test test mode; don't really do anything
--new-install automatically install some tasks
--list-tasks list tasks that would be displayed and exit
--task-packages list available packages in a task
--task-desc returns the description of a task
});
}
# Process command line options and return them in a hash.
sub getopts {
my %ret;
Getopt::Long::Configure ("bundling");
if (! GetOptions(\%ret, "test|t", "new-install", "list-tasks",
"task-packages=s@", "task-desc=s",
"debconf-apt-progress=s")) {
usage();
exit(1);
}
# Special case apt-like syntax.
if (@ARGV) {
my $cmd = shift @ARGV;
if ($cmd eq "install") {
$ret{cmd_install} = \@ARGV;
}
elsif ($cmd eq "remove") {
$ret{cmd_remove} = \@ARGV;
}
else {
usage();
exit 1;
}
}
$testmode=1 if $ret{test}; # set global
return %ret;
}
sub interactive {
my $options = shift;
my @tasks = @_;
if (! $options->{"new-install"}) {
# Don't install hidden tasks if this is not a new install.
map { $_->{_install} = 0 } grep { $_->{_display} == 0 } @tasks;
}
my @list = order_for_display(grep { $_->{_display} == 1 } @tasks);
if (@list) {
if (! $options->{"new-install"}) {
# Find tasks that are already installed.
map { $_->{_installed} = task_installed($_) } @list;
# Don't install new tasks unless manually selected.
map { $_->{_install} = 0 } @list;
}
else {
# Assume that no tasks are installed, to ensure
# that complete tasks get installed on new
# installs.
map { $_->{_installed} = 0 } @list;
}
my $question="tasksel/tasks";
if ($options->{"new-install"}) {
$question="tasksel/first";
}
if ($options->{"new-install"}) {
# Include any preseeded tasks in the list,
# regardless of filtering.
my $tmpfile=`tempfile`;
chomp $tmpfile;
my $ret=system($debconf_helper, "--get", $tmpfile, $question) >> 8;
if ($ret != 0) {
error "debconf failed to run";
}
open(IN, "<$tmpfile");
$ret=<IN>;
if (! defined $ret) {
die "tasksel canceled\n";
}
chomp $ret;
close IN;
unlink $tmpfile;
map { $_->{_display} = 1; $_->{_installed} = 0 } list_to_tasks($ret, @tasks);
@list = order_for_display(grep { $_->{_display} == 1 } @tasks);
}
my @default = grep { $_->{_display} == 1 && ($_->{_install} == 1 || $_->{_installed} == 1) } @tasks;
my $tmpfile=`tempfile`;
chomp $tmpfile;
my $ret=system($debconf_helper, $tmpfile,
task_to_debconf_C(@list),
task_to_debconf(@list),
task_to_debconf_C(@default),
$question) >> 8;
if ($ret == 30) {
exit 10; # back up
}
elsif ($ret != 0) {
error "debconf failed to run";
}
open(IN, "<$tmpfile");
$ret=<IN>;
if (! defined $ret) {
die "tasksel canceled\n";
}
chomp $ret;
close IN;
unlink $tmpfile;
# Set _install flags based on user selection.
map { $_->{_install} = 0 } @list;
foreach my $task (list_to_tasks($ret, @tasks)) {
if (! $task->{_installed}) {
$task->{_install} = 1;
}
$task->{_selected} = 1;
}
foreach my $task (@list) {
if (! $task->{_selected} && $task->{_installed}) {
$task->{_remove} = 1;
}
}
}
# If an enhancing task is already marked for
# install, probably by preseeding, mark the tasks
# it enhances for install.
foreach my $task (grep { $_->{_install} && exists $_->{enhances} &&
length $_->{enhances} } @tasks) {
# Ignore any disjunctive sets. We don't know which
# element(s) we should use, so if the user didn't select any
# it's better to just leave them alone.
my $simple_enhances=join ", ", grep { ! /\|/ } split ", ", $task->{enhances};
map { $_->{_install}=1 } list_to_tasks($simple_enhances, @tasks);
}
# Select enhancing tasks for install.
# XXX FIXME ugly hack -- loop until enhances settle to handle
# chained enhances. This is ugly and could loop forever if
# there's a cycle.
my $enhances_needswork=1;
my %tested;
while ($enhances_needswork) {
$enhances_needswork=0;
foreach my $task (grep { ! $_->{_install} && exists $_->{enhances} &&
length $_->{enhances} } @tasks) {
my %tasknames = map { $_->{task} => $_ } @tasks;
my @deps=map { $tasknames{$_} } split ", ", $task->{enhances};
if (grep { ! defined $_ } @deps) {
# task enhances an unavailable or
# uninstallable task
next;
}
if (@deps) {
my $orig_state=$task->{_install};
# Mark enhancing tasks for install if their
# dependencies are met and their test fields
# mark them for install.
if (! exists $tested{$task->{task}}) {
$ENV{TESTING_ENHANCER}=1;
task_test($task, $options->{"new-install"}, 0, 1);
delete $ENV{TESTING_ENHANCER};
$tested{$task->{task}}=$task->{_install};
}
else {
$task->{_install}=$tested{$task->{task}};
}
foreach my $ordep (@deps) {
my $satisfied=0;
foreach my $dep (map { $tasknames{$_} } split " | ", $ordep) {
if ($dep->{_install}) {
$satisfied=1;
}
}
if (! $satisfied) {
$task->{_install} = 0;
}
}
if ($task->{_install} != $orig_state) {
$enhances_needswork=1;
}
}
}
}
}
sub main {
my %options=getopts();
my @tasks_remove;
my @tasks_install;
# Options that output stuff and don't need a full processed list of
# tasks.
if (exists $options{"task-packages"}) {
my @tasks=all_tasks();
foreach my $taskname (@{$options{"task-packages"}}) {
my $task=name_to_task($taskname, @tasks);
if ($task) {
print "$_\n" foreach task_packages($task);
}
}
exit(0);
}
elsif ($options{"task-desc"}) {
my $task=name_to_task($options{"task-desc"}, all_tasks());
if ($task) {
my $extdesc=join(" ", @{$task->{description}}[1..$#{$task->{description}}]);
print dgettext("debian-tasks", $extdesc)."\n";
exit(0);
}
else {
exit(1);
}
}
# This is relatively expensive, get the full list of available tasks and
# mark them.
my @tasks=map { hide_enhancing_tasks($_) } map { task_test($_, $options{"new-install"}, 1, 0) }
grep { task_avail($_) } all_tasks();
if ($options{"new-install"}) {
filter_tasks(@tasks);
}
if ($options{"list-tasks"}) {
map { $_->{_installed} = task_installed($_) } @tasks;
@tasks=getdescriptions(@tasks);
print "".($_->{_installed} ? "i" : "u")." ".$_->{task}."\t".$_->{shortdesc}."\n"
foreach order_for_display(grep { $_->{_display} } @tasks);
exit(0);
}
if ($options{cmd_install}) {
@tasks_install = map { name_to_task($_, @tasks) } @{$options{cmd_install}};
}
elsif ($options{cmd_remove}) {
@tasks_remove = map { name_to_task($_, @tasks) } @{$options{cmd_remove}};
}
else {
interactive(\%options, @tasks);
# Add tasks to install
@tasks_install = grep { $_->{_install} } @tasks;
# Add tasks to remove
@tasks_remove = grep { $_->{_remove} } @tasks;
}
my @cmd;
if (-x "/usr/bin/debconf-apt-progress") {
@cmd = "debconf-apt-progress";
push @cmd, split(' ', $options{'debconf-apt-progress'})
if exists $options{'debconf-apt-progress'};
push @cmd, "--";
}
push @cmd, qw{apt-get -q -y -o APT::Install-Recommends=true -o APT::Get::AutomaticRemove=true -o APT::Acquire::Retries=3 install};
# And finally, act on selected tasks.
if (@tasks_install || @tasks_remove) {
foreach my $task (@tasks_remove) {
push @cmd, map { "$_-" } task_packages($task);
task_script($task->{task}, "prerm");
}
foreach my $task (@tasks_install) {
push @cmd, task_packages($task);
task_script($task->{task}, "preinst");
}
my $ret=run(@cmd);
if ($ret != 0) {
error gettext("apt-get failed")." ($ret)";
}
foreach my $task (@tasks_remove) {
task_script($task->{task}, "postrm");
}
foreach my $task (@tasks_install) {
task_script($task->{task}, "postinst");
}
}
}
main();
