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|
#!/usr/bin/perl -w
=head1 NAME
dh_python - calculates python dependencies and adds postinst and prerm python scripts
=cut
use strict;
use File::Find;
use Debian::Debhelper::Dh_Lib;
=head1 SYNOPSIS
B<dh_python> [S<I<debhelper options>>] [B<-n>] [S<I<module dirs ...>>]
=head1 DESCRIPTION
dh_python is a debhelper program that is responsible for generating the
${python:Depends} substitutions and adding them to substvars files. It
will also add a postinst and a prerm script if required.
The program will look at python scripts and modules in your package, and
will use this information to generate a dependency on python, with the
current major version, or on pythonX.Y if your scripts or modules need a
specific python version. The dependency will be substituted into your
package's control file wherever you place the token "${python:Depends}".
If some modules need to be byte-compiled at build time, appropriate
postinst and prerm scripts will be generated.
=head1 OPTIONS
=over 4
=item I<module dirs>
If your package installs python modules in non-standard directories, you
can make dh_python check those directories by passing their names on the
command line. By default, it will check /usr/lib/site-python,
/usr/lib/$PACKAGE, /usr/share/$PACKAGE, /usr/lib/games/$PACKAGE,
/usr/share/games/$PACKAGE and /usr/lib/python?.?/site-packages.
=item B<-n>, B<--noscripts>
Do not modify postinst/postrm scripts.
=back
=head1 CONFORMS TO
Debian policy, version 3.5.7
Python policy, version 0.3.7
=cut
init();
my $python = 'python';
# The current python major version
my $python_version;
my $python_major;
if(`$python -V 2>&1` =~ m/^Python\s+(\d+)\.(\d+)\.\d+\n$/) {
$python_version = "$1.$2" ;
$python_major = $1 ;
} else {
error("Cannot obtain python version.");
}
# The next python version
my $python_nextversion = $python_version + 0.1;
my $python_nextmajor = $python_major + 1;
my @python_allversions = ('1.5','2.1','2.2','2.3');
foreach (@python_allversions) {
s/^/python/;
}
# Cleaning the paths given on the command line
foreach (@ARGV) {
s#/$##;
s#^/##;
}
# dependency types
use constant PROGRAM => 1;
use constant PY_MODULE => 2;
foreach my $package (@{$dh{DOPACKAGES}}) {
my $tmp = tmpdir($package);
delsubstvar($package, "python:Depends");
# Check for current python dependencies
my @dirs = ("usr/lib/site-python", "usr/lib/$package", "usr/share/$package", "usr/lib/games/$package", "usr/share/games/$package", @ARGV );
@dirs = grep -d, map "$tmp/$_", @dirs;
my $deps = 0;
my %verdeps = ();
foreach (@python_allversions) {
$verdeps{$_} = 0;
}
# Find scripts
find sub {
return unless -f and (-x or /\.py$/);
local *F;
return unless open F, $_;
if (read F, local $_, 32 and m%^#!\s*/usr/bin/(env\s+)?(python(\d+\.\d+)?)\s%) {
if ( "python" eq $2 ) {
$deps |= PROGRAM;
} elsif(defined $verdeps{$2}) {
$verdeps{$2} |= PROGRAM;
}
}
close F;
}, $tmp;
# Look for python modules
my $dirlist="";
if (@dirs) {
foreach my $curdir (@dirs) {
my $has_module = 0;
$curdir =~ s%^$tmp/%%;
find sub {
return unless -f;
$has_module = 1 if /\.py$/;
}, "$tmp/$curdir" ;
if($has_module) {
$deps |= PY_MODULE;
$dirlist="$dirlist /$curdir";
}
}
}
# Dependencies on current python
my $dep_on_python = 0;
my $strong_dep = 0;
$dep_on_python = 1 if $deps;
$strong_dep = 1 if($deps & PY_MODULE);
if($package =~ /^python-/) {
my $pack = $package;
$pack =~ s/^python/python$python_version/;
if(grep { "$_" eq "$pack" } @{$dh{DOPACKAGES}}) {
addsubstvar($package, "python:Depends", $pack);
$dep_on_python = 1;
$strong_dep = 1;
}
}
if($dep_on_python) {
addsubstvar($package, "python:Depends", $python, ">= $python_version");
if($strong_dep) {
addsubstvar($package, "python:Depends", $python, "<< $python_nextversion");
} else {
addsubstvar($package, "python:Depends", $python, "<< $python_nextmajor");
}
}
my $need_prerm = 0;
# Look for specific pythonX.Y modules
foreach my $pyver (@python_allversions) {
my $pydir="/usr/lib/$pyver/site-packages";
if (grep -d,"$tmp$pydir") {
find sub {
return unless -f;
$verdeps{$pyver} |= PY_MODULE if /\.py$/;
}, "$tmp$pydir";
}
# Go for the dependencies
addsubstvar($package, "python:Depends", $pyver) if $verdeps{$pyver};
# And now, the postinst and prerm stuff
if($pyver eq "python$python_version") {
if($verdeps{$pyver} & PY_MODULE) {
$pydir = $pydir.$dirlist;
} else {
$pydir = $dirlist;
}
$verdeps{$pyver} |= PY_MODULE if($deps & PY_MODULE);
}
if($verdeps{$pyver} & PY_MODULE) {
autoscript($package,"postinst","postinst-python","s%#PYVER#%$pyver%;s%#DIRLIST#%$pydir%");
$need_prerm = 1;
}
}
if($need_prerm) {
autoscript($package,"prerm","prerm-python","s%#PACKAGE#%$package%");
}
}
=head1 SEE ALSO
L<debhelper(1)>
This program is a part of debhelper.
=head1 AUTHOR
Josselin Mouette <joss@debian.org>
most ideas stolen from Brendan O'Dea <bod@debian.org>
=cut
|
