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>] [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 build 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<-n>, B<--noscripts>
48 Do not modify postinst/postrm scripts.
54 Debian policy, version 3.5.7
56 Python policy, version 0.3.7
62 my $python = 'python';
64 # The current python major version
66 my $python_version = `$python -V 2>&1`;
67 if ("$python_version" eq "") {
68 error("Python is not installed, aborting. (Probably forgot to Build-Depend on python.)");
70 elsif ($python_version =~ m/^Python\s+(\d+)\.(\d+)\.\d+\+?\n$/) {
71 $python_version = "$1.$2" ;
74 error("Unable to parse python version out of \"$python_version\".");
77 # The next python version
78 my $python_nextversion = $python_version + 0.1;
79 my $python_nextmajor = $python_major + 1;
81 my @python_allversions = ('1.5','2.1','2.2','2.3');
82 foreach (@python_allversions) {
86 # Cleaning the paths given on the command line
93 use constant PROGRAM => 1;
94 use constant PY_MODULE => 2;
96 foreach my $package (@{$dh{DOPACKAGES}}) {
97 my $tmp = tmpdir($package);
99 delsubstvar($package, "python:Depends");
101 # Check for current python dependencies
102 my @dirs = ("usr/lib/site-python", "usr/lib/$package", "usr/share/$package", "usr/lib/games/$package", "usr/share/games/$package", @ARGV );
103 @dirs = grep -d, map "$tmp/$_", @dirs;
107 foreach (@python_allversions) {
113 return unless -f and (-x or /\.py$/);
115 return unless open F, $_;
116 if (read F, local $_, 32 and m%^#!\s*/usr/bin/(env\s+)?(python(\d+\.\d+)?)\s%) {
117 if ( "python" eq $2 ) {
119 } elsif(defined $verdeps{$2}) {
120 $verdeps{$2} |= PROGRAM;
126 # Look for python modules
129 foreach my $curdir (@dirs) {
131 $curdir =~ s%^$tmp/%%;
134 $has_module = 1 if /\.py$/;
138 $dirlist="$dirlist /$curdir";
143 # Dependencies on current python
144 my $dep_on_python = 0;
146 $dep_on_python = 1 if $deps;
147 $strong_dep = 1 if($deps & PY_MODULE);
148 if ($package =~ /^python-/) {
150 $pack =~ s/^python/python$python_version/;
151 if (grep { "$_" eq "$pack" } GetPackages()) {
152 addsubstvar($package, "python:Depends", $pack);
157 if ($dep_on_python) {
158 addsubstvar($package, "python:Depends", $python, ">= $python_version");
160 addsubstvar($package, "python:Depends", $python, "<< $python_nextversion");
162 addsubstvar($package, "python:Depends", $python, "<< $python_nextmajor");
168 # Look for specific pythonX.Y modules
169 foreach my $pyver (@python_allversions) {
170 my $pydir="/usr/lib/$pyver/site-packages";
171 if (grep -d,"$tmp$pydir") {
174 $verdeps{$pyver} |= PY_MODULE if /\.py$/;
178 # Go for the dependencies
179 addsubstvar($package, "python:Depends", $pyver) if $verdeps{$pyver};
181 # And now, the postinst and prerm stuff
182 if ($pyver eq "python$python_version") {
183 if ($verdeps{$pyver} & PY_MODULE) {
184 $pydir = $pydir.$dirlist;
188 $verdeps{$pyver} |= PY_MODULE if($deps & PY_MODULE);
190 if ($verdeps{$pyver} & PY_MODULE && ! $dh{NOSCRIPTS}) {
191 autoscript($package,"postinst","postinst-python","s%#PYVER#%$pyver%;s%#DIRLIST#%$pydir%");
195 if ($need_prerm && ! $dh{NOSCRIPTS}) {
196 autoscript($package,"prerm","prerm-python","s%#PACKAGE#%$package%");
204 This program is a part of debhelper.
208 Josselin Mouette <joss@debian.org>
210 most ideas stolen from Brendan O'Dea <bod@debian.org>