5 dh_python - calculates python dependencies and adds postinst and prerm python scripts
11 use Debian::Debhelper::Dh_Lib;
15 B<dh_python> [S<I<debhelper options>>] [B<-n>] [B<-V> I<version>] [S<I<module dirs ...>>]
19 dh_python is a debhelper program that is responsible for generating the
20 ${python:Depends} substitutions and adding them to substvars files. It
21 will also add a postinst and a prerm script if required.
23 The program will look at python scripts and modules in your package, and
24 will use this information to generate a dependency on python, with the
25 current major version, or on pythonX.Y if your scripts or modules need a
26 specific python version. The dependency will be substituted into your
27 package's control file wherever you place the token "${python:Depends}".
29 If some modules need to be byte-compiled at install time, appropriate
30 postinst and prerm scripts will be generated.
32 If you use this program, your package should build-depend on python.
40 If your package installs python modules in non-standard directories, you
41 can make dh_python check those directories by passing their names on the
42 command line. By default, it will check /usr/lib/site-python,
43 /usr/lib/$PACKAGE, /usr/share/$PACKAGE, /usr/lib/games/$PACKAGE,
44 /usr/share/games/$PACKAGE and /usr/lib/python?.?/site-packages.
46 =item B<-V> I<version>
48 If the .py files your package ships are meant to be used by a specific
49 pythonX.Y version, you can set this option with the desired X.Y python
51 Do not use if you ship modules in /usr/lib/site-python.
53 =item B<-n>, B<--noscripts>
55 Do not modify postinst/postrm scripts.
61 Debian policy, version 3.5.7
63 Python policy, version 0.3.7
69 my $python = 'python';
71 # The current python major version
73 my $python_version = `$python -V 2>&1`;
74 if ("$python_version" eq "") {
75 error("Python is not installed, aborting. (Probably forgot to Build-Depend on python.)");
77 elsif ($python_version =~ m/^Python\s+(\d+)\.(\d+)(\.\d+)*/) {
78 $python_version = "$1.$2" ;
81 error("Unable to parse python version out of \"$python_version\".");
84 # The next python version
85 my $python_nextversion = $python_version + 0.1;
86 my $python_nextmajor = $python_major + 1;
88 my @python_allversions = ('1.5','2.1','2.2','2.3');
89 foreach (@python_allversions) {
94 my $usepython = "python$python_version";
96 $usepython = $dh{V_FLAG};
97 $usepython =~ s/^/python/;
100 # Cleaning the paths given on the command line
107 use constant PROGRAM => 1;
108 use constant PY_MODULE => 2;
109 use constant PY_MODULE_NONSTANDARD => 4;
111 foreach my $package (@{$dh{DOPACKAGES}}) {
112 my $tmp = tmpdir($package);
114 delsubstvar($package, "python:Depends");
116 my @dirs = ("usr/lib/site-python", "usr/lib/$package", "usr/share/$package", "usr/lib/games/$package", "usr/share/games/$package", @ARGV );
118 my $dep_on_python = 0;
120 my $look_for_pythonXY = 1;
122 # First, the case of python-foo
123 if ($package =~ /^python-/) {
127 $pack =~ s/^python/python$python_version/;
128 if (grep { "$_" eq "$pack" } GetPackages()) {
129 addsubstvar($package, "python:Depends", $pack);
132 push @dirs, "usr/lib/python$python_version/site-packages" ;
133 $look_for_pythonXY = 0;
137 @dirs = grep -d, map "$tmp/$_", @dirs;
141 foreach (@python_allversions) {
147 return unless -f and (-x or /\.py$/);
149 return unless open F, $_;
150 if (read F, local $_, 32 and m%^#!\s*/usr/bin/(env\s+)?(python(\d+\.\d+)?)\s%) {
151 if ( "python" eq $2 ) {
153 } elsif(defined $verdeps{$2}) {
154 $verdeps{$2} |= PROGRAM;
160 # Look for python modules
163 foreach my $curdir (@dirs) {
165 $curdir =~ s%^$tmp/%%;
168 $has_module = 1 if /\.py$/;
171 if ($dh{V_FLAG_SET}) {
172 $verdeps{$usepython} |= PY_MODULE_NONSTANDARD;
176 $dirlist="$dirlist /$curdir";
181 # Dependencies on current python
182 $dep_on_python = 1 if $deps;
183 $strong_dep = 1 if($deps & PY_MODULE);
185 if ($dep_on_python) {
186 addsubstvar($package, "python:Depends", $python, ">= $python_version");
188 addsubstvar($package, "python:Depends", $python, "<< $python_nextversion");
190 addsubstvar($package, "python:Depends", $python, "<< $python_nextmajor");
196 # Look for specific pythonX.Y modules
197 foreach my $pyver (@python_allversions) {
198 my $pydir="/usr/lib/$pyver/site-packages";
199 if ($look_for_pythonXY) {
200 if (grep -d,"$tmp$pydir") {
203 $verdeps{$pyver} |= PY_MODULE if /\.py$/;
208 # Go for the dependencies
209 addsubstvar($package, "python:Depends", $pyver) if $verdeps{$pyver};
211 # And now, the postinst and prerm stuff
212 if ($pyver eq "$usepython") {
213 if ($verdeps{$pyver} & PY_MODULE) {
214 $pydir = $pydir.$dirlist;
218 $verdeps{$pyver} |= PY_MODULE if($deps & PY_MODULE);
220 if ($verdeps{$pyver} & (PY_MODULE|PY_MODULE_NONSTANDARD) && ! $dh{NOSCRIPTS}) {
221 autoscript($package,"postinst","postinst-python","s%#PYVER#%$pyver%;s%#DIRLIST#%$pydir%");
225 if ($need_prerm && ! $dh{NOSCRIPTS}) {
226 autoscript($package,"prerm","prerm-python","s%#PACKAGE#%$package%");
234 This program is a part of debhelper.
238 Josselin Mouette <joss@debian.org>
240 most ideas stolen from Brendan O'Dea <bod@debian.org>