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path: root/lib/SlackBuilder.pm
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package SlackBuilder;
use strict;
use warnings;
use Carp;
use SlackBuild::URI;
use SlackBuild::Archive;
use SlackBuild::Registry;
use SlackBuild::Rc;
use File::Spec;
use File::Basename;
use File::Temp qw/ tempfile tempdir /;
use File::Copy;
use POSIX::Run::Capture qw(:all);
use POSIX qw(:sys_wait_h strerror uname);

use constant {
    E_OK => 0,
    E_SYNTAX => 1,
    E_EXEC => 2,
    E_BADBUILD => 3,
    E_FAIL => 4
};

our $VERSION = '1.0';
our @EXPORT = qw(E_OK
                 E_SYNTAX
                 E_EXEC
                 E_BADBUILD
                 E_FAIL);

our $rootdir = "/srv/slackbuild";
our $image = "gray/slackware:14.1-full";

sub new {
    my ($class, %args) = @_;
    my $self = bless {}, $class;

    $self->{_rootdir} = delete $args{rootdir} || $rootdir;
    $self->{_spooldir} = delete $args{spooldir} || "$rootdir/spool";
    $self->{_tmpdir} = delete $args{tmpdir} || "$rootdir/tmp";
    $self->{_logdir} = delete $args{logdir} || "$rootdir/log";
    $self->{_pkgdir} = delete $args{pkgdir} || "$rootdir/pkg";
    $self->{_image} = delete $args{image} || $image;
    $self->{_verbose} = delete $args{verbose};

    croak "bad number of arguments" if keys(%args);

    $self->clear;
    
    return $self;
}

sub rootdir  { shift->{_rootdir} };
sub spooldir { shift->{_spooldir} };
sub tmpdir   { shift->{_tmpdir} };
sub logdir   { shift->{_logdir} };
sub pkgdir   { shift->{_pkgdir} };
sub ospkgdir {
    my $self = shift;
    File::Spec->catfile($self->pkgdir, $self->osversion, @_);
}
sub image    { shift->{_image} };
sub verbose  { shift->{_verbose} };
sub arch     { shift->{_arch} };

sub error {
    my ($self, $diag) = @_;
    push @{$self->{_error}}, $diag;
}

sub errors {
    my $self = shift;
    if (wantarray) {
	( @{$self->{_error}} );
    } else {
	@{$self->{_error}};
    }
}

sub errno {
    my $self = shift;
    croak "bad number of arguments" if @_ > 1;
    if (my $v = shift) {
	$self->{_errno} = $v;
    }
    return $self->{_errno};
}

sub is_success {
    shift->errno == E_OK;
}

sub clear {
    my $self = shift;
    $self->{_errno} = E_OK;
    $self->{_error} = [];
    delete $self->{_request};
    delete $self->{_result};
}

sub request {
    my $self = shift;
    croak "too many arguments" if @_ > 1;
    if (my $v = shift) {
	$self->{_request} = $v;
    }
    return $self->{_request};
}

sub package_name { shift->request->package }
sub package_version { shift->request->version }
sub package_build { shift->request->build }
sub rc { shift->request->rc }
sub slackbuild_uri { shift->request->slackbuild_uri }
sub source_uri { shift->request->source_uri }
sub prereq { shift->request->prereq || []}

sub environ {
    my $self = shift;
    my $env = {%{$self->request->environ // {}},
	       VERSION => $self->package_version};
    if (my $b = $self->package_build) {
	$env->{BUILD} = $b;
    }
    return $env;
}

sub file {
    my ($self, $name) = @_;
    my $src = File::Spec->catfile($self->tmpdir, $name);
    my $dst = $self->ospkgdir($name);

    my $dstdir = dirname($dst);
    if (! -d $dstdir) {
	unless (mkdir($dstdir)) {
	    $self->error("mkdir($dstdir): $!");
	    $self->errno(E_FAIL);
	    return;
	}
    }
    
    if (-e $dst) {
	unlink $dst;
    }
    unless (move($src, $dst)) {
	$self->error("move($src, $dst): $!");
	$self->errno(E_FAIL);
    }
    push @{$self->{_result}{output_files}}, $dst;
}

sub os_probe {
    my $self = shift;

    unless (exists($self->{_os_release})) {
	my @args = ( 'docker',
		     'run',
		     '--rm=true',
		     $self->image,
		     '/bin/sh',
		     '-c',
		     'uname -m; cat /etc/os-release' );

	my $obj = new POSIX::Run::Capture(argv => \@args);
	if ($obj->run) {
	    $self->_runcap_diag($obj);
	} else {
	    $self->error("can't run docker: ".strerror($obj->errno));
	    return $self->errno(E_EXEC);
	}
	$obj->rewind(SD_STDOUT);
	chomp($self->{_arch} = $obj->next_line(SD_STDOUT));
	while (my $s = $obj->next_line(SD_STDOUT)) {
	    chomp($s);
	    my ($name,$value)=split /=/, $s, 2;
	    $value =~ s/^"(.*)"\s*$/$1/;
	    $self->{_os}{$name} = $value;
	}
    }
    return E_OK;
}

sub os_release {
    my ($self, $value) = @_;
    return $self->{_os}{$value};
}

sub osversion { shift->os_release('VERSION') }

sub output_files {
    my $self = shift;
    $self->{_result}{output_files} //= [];
    if (wantarray) {
	return () if $self->errno;
	return (@{$self->{_result}{output_files}});
    } else {
	return @{$self->{_result}{output_files}};
    }
}

sub wd {
    my $self = shift;
    unless ($self->{_request}{dir}) {
	$self->{_request}{dir} = tempdir(DIR => $self->spooldir, CLEANUP => 1);
    }
    return $self->{_request}{dir};
}

sub slackbuild_name {
    my $self = shift;
    return $self->package_name . '.SlackBuild';
}

sub run {
    my ($self, $req) = @_;

    $self->clear;
    unless ($req->package) {
	$self->error("package: not present");
    }
    unless ($req->slackbuild_uri) {
	$self->error("slackbuild_uri: not present");
    }
    if ($self->errors) {
	return $self->errno(E_SYNTAX);
    }
    
    $self->request($req);

    my $archive = new SlackBuild::Archive($self->package_name,
					  $self->slackbuild_uri);
    
    unless ($archive->download($self->wd)) {
	$self->error("can't download $archive: "
		     . $archive->download_status);
	return $self->errno(E_FAIL);
    }

    $self->request->addinfo($archive->info);

    if (my $urilist = $self->request->source_uri) {
	foreach my $s (@$urilist) {
	    my $uri = new SlackBuild::URI($s);
	    my $dest = File::Spec->catfile($self->wd, basename($uri->path));
	    unless ($uri->download($dest)) {
		$self->error("can't download $uri: ".$uri->download_status);
		return $self->errno(E_FAIL);
	    }
	}
    }
	
    return $self->_build;
}  

sub _runcap_diag {
    my ($self, $obj) = @_;
    if (WIFEXITED($obj->status)) {
	return if $obj->status == 0;
	while (my $s = $obj->next_line(SD_STDERR)) {
	    chomp($s);
	    $self->error($s);
	}
	$self->error("program "
		     . $obj->program
		     . " terminated with code "
		     . WEXITSTATUS($obj->status));
    } elsif (WIFSIGNALED($obj->status)) {
	$self->error("program "
		     . $obj->program
		     . " terminated on signal "
		     . WTERMSIG($obj->status));
    } else {
	$self->error("program "
		     . $obj->program
		     . " terminated with unrecogized code "
		     . $obj->status);
    }
    $self->errno(E_EXEC);
}
 
sub _logfilename {
    my $self = shift;
    return File::Spec->catfile($self->logdir, $self->package_name . '.log');
}

sub _prepare {
    my $self = shift;
    
    # Find prerequisites
    # FIXME: Build a dependency graph and spawn slackbuilders for missing ones

    # FIXME: registry type should be configurable
    my $reg = new SlackBuild::Registry('FS', dir => $self->ospkgdir);

    my $filename = File::Spec->catfile($self->wd, 'rc');
    return unless SlackBuild::Rc->new($self)->write($reg, $filename);
    return 'rc';
}
    
sub _build {
    my $self = shift;
    
    $self->os_probe;
    return $self->errno if $self->errno;
    
    my $contname = $self->package_name . '_slackbuild';
    my $rcfile = $self->_prepare or return $self->errno(E_FAIL);
    my @args = ( 'docker',
		 'run',
		 '--rm=true',
		 '--workdir=/usr/src',
		 '-v', $self->wd . ':/usr/src',
		 '-v', $self->tmpdir . ':/tmp',
		 '-v', $self->ospkgdir . ':/var/pkg:ro',
		 $self->image,
		 '/bin/sh',
		 $rcfile,
		 $self->slackbuild_name);

    printf("building %s on %s version %s (%s)\n",
	   $self->package_name,
	   $self->os_release('NAME'),
	   $self->os_release('VERSION'),
	   $self->arch);

    open(my $logfd, '>', $self->_logfilename)
	or do {
	    $self->error("can't create log file " .
			 $self->_logfilename .
			 ": $!");
	    return $self->errno(E_FAIL);
    };
    
    my $obj = new POSIX::Run::Capture(argv => \@args,
				      stdout => sub {
					  print $logfd 'OUT: ' . shift
				      },
				      stderr => sub {
					  my $line = shift;
					  chomp($line);
					  $self->error($line);
					  if ($self->verbose) {
					      print STDERR "$line\n";
					  }
					  print $logfd "ERR: $line\n";
				      });
    $self->{_result}{docker} = $obj;
    if ($obj->run) {
	$self->_runcap_diag($obj);
    } else {
	$self->error("can't run docker: ".strerror($obj->errno));
	return $self->errno(E_EXEC);
    }
#    $self->errno(E_FAIL) if $self->errors;

    $obj->rewind(SD_STDOUT);
    while (my $s = $obj->next_line(SD_STDOUT)) {
	chomp($s);
	if ($s =~ m{^Slackware package /tmp/(.+?) created}) {
	    $self->file($1);
	}
    }
    return $self->errno(E_OK);
}    


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