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1 # A debhelper build system class for building Python Distutils based
2 # projects. It prefers out of source tree building.
3 #
4 # Copyright: © 2008 Joey Hess
5 #            © 2008-2009 Modestas Vainius
6 # License: GPL-2+
7
8 package Debian::Debhelper::Buildsystem::python_distutils;
9
10 use strict;
11 use Cwd ();
12 use Debian::Debhelper::Dh_Lib qw(error);
13 use base 'Debian::Debhelper::Buildsystem';
14
15 sub DESCRIPTION {
16         "Python Distutils (setup.py)"
17 }
18
19 sub DEFAULT_BUILD_DIRECTORY {
20         my $this=shift;
21         return $this->canonpath($this->get_sourcepath("build"));
22 }
23
24 sub new {
25         my $class=shift;
26         my $this=$class->SUPER::new(@_);
27         # Out of source tree building is preferred.
28         $this->prefer_out_of_source_building(@_);
29         return $this;
30 }
31
32 sub check_auto_buildable {
33         my $this=shift;
34         return -e $this->get_sourcepath("setup.py") ? 1 : 0;
35 }
36
37 sub not_our_cfg {
38         my $this=shift;
39         my $ret;
40         if (open(my $cfg, $this->get_buildpath(".pydistutils.cfg"))) {
41                 $ret = not "# Created by dh_auto\n" eq <$cfg>;
42                 close $cfg;
43         }
44         return $ret;
45 }
46
47 sub create_cfg {
48         my $this=shift;
49         if (open(my $cfg, ">", $this->get_buildpath(".pydistutils.cfg"))) {
50                 print $cfg "# Created by dh_auto", "\n";
51                 print $cfg "[build]\nbuild-base=", $this->get_build_rel2sourcedir(), "\n";
52                 close $cfg;
53                 return 1;
54         }
55         return 0;
56 }
57
58 sub pre_building_step {
59         my $this=shift;
60         my $step=shift;
61
62         return unless grep /$step/, qw(build install clean);
63
64         if ($this->get_buildpath() ne $this->DEFAULT_BUILD_DIRECTORY()) {
65                 # --build-base can only be passed to the build command. However,
66                 # it is always read from the config file (really weird design).
67                 # Therefore create such a cfg config file.
68                 # See http://bugs.python.org/issue818201
69                 #     http://bugs.python.org/issue1011113
70                 not $this->not_our_cfg() or
71                     error("cannot set custom build directory: .pydistutils.cfg is in use");
72                 $this->mkdir_builddir();
73                 $this->create_cfg() or
74                     error("cannot set custom build directory: unwritable .pydistutils.cfg");
75                 # Distutils reads $HOME/.pydistutils.cfg
76                 $ENV{HOME} = Cwd::abs_path($this->get_buildpath());
77         }
78
79         $this->SUPER::pre_building_step($step);
80 }
81
82 sub dbg_build_needed {
83         my $this=shift;
84         my $act=shift;
85
86         # Return a list of python-dbg package which are listed
87         # in the build-dependencies. This is kinda ugly, but building
88         # dbg extensions without checking if they're supposed to be
89         # built may result in various FTBFS if the package is not
90         # built in a clean chroot.
91
92         my @dbg;
93         open (CONTROL, 'debian/control') ||
94                 error("cannot read debian/control: $!\n");
95         foreach my $builddeps (join('', <CONTROL>) =~ 
96                         /^Build-Depends[^:]*:.*\n(?:^[^\w\n].*\n)*/gmi) {
97                 while ($builddeps =~ /(python[^, ]*-dbg)/g) {
98                         push @dbg, $1;
99                 }
100         }
101
102         close CONTROL;
103         return @dbg;
104
105 }
106
107 sub setup_py {
108         my $this=shift;
109         my $act=shift;
110
111         # We need to to run setup.py with the default python last
112         # as distutils/setuptools modifies the shebang lines of scripts.
113         # This ensures that #!/usr/bin/python is installed last and
114         # not pythonX.Y
115         # Take into account that the default Python must not be in
116         # the requested Python versions.
117         # Then, run setup.py with each available python, to build
118         # extensions for each.
119
120         my $python_default = `pyversions -d`;
121         $python_default =~ s/^\s+//;
122         $python_default =~ s/\s+$//;
123         my @python_requested = split ' ', `pyversions -r 2>/dev/null`;
124         if (grep /^\Q$python_default\E/, @python_requested) {
125                 @python_requested = (
126                         grep(!/^\Q$python_default\E/, @python_requested),
127                         "python",
128                 );
129         }
130
131         my @python_dbg;
132         my @dbg_build_needed = $this->dbg_build_needed();
133         foreach my $python (map { $_."-dbg" } @python_requested) {
134                 if (grep /^(python-all-dbg|\Q$python\E)/, @dbg_build_needed) {
135                         push @python_dbg, $python;
136                 }
137                 elsif (($python eq "python-dbg")
138                        and (grep /^\Q$python_default\E/, @dbg_build_needed)) {
139                         push @python_dbg, $python_default."-dbg";
140                 }
141         }
142
143         foreach my $python (@python_dbg, @python_requested) {
144                 if (-x "/usr/bin/".$python) {
145                         # To allow backports of debhelper we don't pass
146                         # --install-layout=deb to 'setup.py install` for
147                         # those Python versions where the option is
148                         # ignored by distutils/setuptools.
149                         if ( $act eq "install" and not
150                              ( ($python =~ /^python(?:-dbg)?$/
151                                  and $python_default =~ /^python2\.[2345]$/)
152                               or $python =~ /^python2\.[2345](?:-dbg)?$/ )) {
153                                 $this->doit_in_sourcedir($python, "setup.py",
154                                                 $act, @_, "--install-layout=deb");
155                         }
156                         else {
157                                 $this->doit_in_sourcedir($python, "setup.py",
158                                                 $act, @_);
159                         }
160                 }
161         }
162 }
163
164 sub build {
165         my $this=shift;
166         $this->setup_py("build",
167                 "--force",
168                 @_);
169 }
170
171 sub install {
172         my $this=shift;
173         my $destdir=shift;
174         $this->setup_py("install",
175                 "--force",
176                 "--root=$destdir",
177                 "--no-compile",
178                 "-O0",
179                 @_);
180 }
181
182 sub clean {
183         my $this=shift;
184         $this->setup_py("clean", "-a", @_);
185
186         # Config file will remain if it was created by us
187         if (!$this->not_our_cfg()) {
188                 unlink($this->get_buildpath(".pydistutils.cfg"));
189                 $this->rmdir_builddir(1); # only if empty
190         }
191         # The setup.py might import files, leading to python creating pyc
192         # files.
193         $this->doit_in_sourcedir('find', '.', '-name', '*.pyc', '-exec', 'rm', '{}', ';');
194 }
195
196 1