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#!/usr/bin/perl -w
#
# Used to start the Jython interpreter.
#
# Copyright (C) 2004-2005, Ben Burton <bab@debian.org>
# Released under the GPL.
use strict;
use Text::ParseWords;
# Debian constants.
#
my $jythonHome = '/usr/share/jython';
my $debianJNIDir = '/usr/lib/jni';
my $defaultRuntime = '/usr/bin/java';
# Establish the user's home directory.
#
my $home = $ENV{HOME} || $ENV{LOGDIR};
$home or bail("I cannot determine your home directory.",
"Please set \$HOME and try again.");
# Decide upon the Java runtime.
#
my $javaRuntime = undef;
if ($ENV{JAVA}) {
$javaRuntime = $ENV{JAVA};
} elsif (-x $defaultRuntime) {
$javaRuntime = $defaultRuntime;
} else {
&warn("The default Java runtime ($defaultRuntime) cannot be executed.",
"Since every Java runtime in Debian must supply an alternative",
"for $defaultRuntime, your system is almost certainly misconfigured.");
if ($ENV{JAVA_HOME}) {
&warn("Using \$JAVA_HOME/bin/java instead.");
$javaRuntime = "$ENV{JAVA_HOME}/bin/java";
} else {
bail("I cannot find an appropriate Java runtime to use instead.",
"Please set \$JAVA to the appropriate binary and try again.");
}
}
# Decide upon and export the classpath.
# Add in $CLASSPATH as well as other useful libraries if they exist.
#
my $classpath = '/usr/share/java/jython.jar';
appendClasspath($ENV{CLASSPATH});
appendJar('/usr/share/java/antlr3-runtime.jar');
appendJar('/usr/share/java/asm3.jar');
appendJar('/usr/share/java/asm3-commons.jar');
appendJar('/usr/share/java/asm3-util.jar');
appendJar('/usr/share/java/jna.jar');
appendJar('/usr/share/java/jna-posix.jar');
appendJar('/usr/share/java/libconstantine-java.jar');
appendJar('/usr/share/java/xercesImpl.jar');
appendJar('/usr/share/java/jline.jar');
appendJar('/usr/share/java/servlet-api-2.5.jar');
appendJar('/usr/share/java/libreadline-java.jar');
appendJar('/usr/share/java/mysql.jar');
appendJar('/usr/share/java/postgresql.jar');
$ENV{CLASSPATH} = $classpath;
# Decide upon the python path.
my $jythonPath = "/usr/lib/site-python";
# Set up the cache directory.
#
my $cacheDir = "$home/.jython-cache";
if (-e $cacheDir and ! -d $cacheDir) {
# The expected cache directory exists but is not a directory.
# Use a temporary directory instead.
$cacheDir = `mktemp -dt jython-cache.XXXXXX` or
bail("Could not create temporary cache directory.");
chomp $cacheDir;
}
if (! -e $cacheDir) {
# Create a new cache directory.
mkdir $cacheDir or bail("Could not create cache directory $cacheDir.");
}
# We will build up a JNI library path from various places.
#
my $jniPath = '';
# Run through $JAVA_OPTIONS and extract the java arguments.
# Any JNI library path arguments will be removed and put into $jniPath
# instead.
#
my @javaArgs = ();
if ($ENV{JAVA_OPTIONS}) {
foreach my $arg (shellwords($ENV{JAVA_OPTIONS})) {
if ($arg =~ /^-Djava\.library\.path=(.+)$/) {
$jniPath = $jniPath ? "$jniPath:$1" : "$1";
} else {
push @javaArgs, $arg;
}
}
}
# Run through the command-line options and extract the jython arguments.
# Any -Djava... arguments will be reassigned as java arguments instead
# (unless it's for the JNI library path, in which case it will go to
# $jniPath).
#
my @jythonArgs = ();
foreach my $arg (@ARGV) {
if ($arg =~ /^-Djava\.library\.path=(.+)$/) {
$jniPath = $jniPath ? "$jniPath:$1" : "$1";
} elsif ($arg =~ /^-Djava/) {
push @javaArgs, $arg;
} else {
push @jythonArgs, $arg;
}
}
# Finish by adding the debian JNI directory to $jniPath if it's not
# already present, since some popular non-free JVMs still don't support
# it (grumble).
#
if ($jniPath !~ /(^|:)$debianJNIDir($|:)/) {
$jniPath = $jniPath ? "$jniPath:$debianJNIDir" : $debianJNIDir;
}
# Invoke jython!
#
my @fullCommandLine = ( $javaRuntime );
push @fullCommandLine, @javaArgs;
push @fullCommandLine, "-Djava.library.path=$jniPath";
push @fullCommandLine, "-Dpython.home=$jythonHome";
push @fullCommandLine, "-Dpython.path=$jythonPath";
push @fullCommandLine, "-Dpython.executable=$0";
push @fullCommandLine, "-Dpython.cachedir=$cacheDir";
push @fullCommandLine, "-Dpython.console=org.python.util.ReadlineConsole";
push @fullCommandLine, "-Dpython.console.readlinelib=Editline";
$ENV{CALLED_FROM_JYTHONC} and
push @fullCommandLine, "-Dpython.jythonc.compiler=$ENV{JAVAC}";
push @fullCommandLine, 'org.python.util.jython';
push @fullCommandLine, @jythonArgs;
$ENV{JYTHON_WRAPPER_DEBUG} and print "$ENV{CLASSPATH}\n\n@fullCommandLine\n\n";
exec @fullCommandLine or exit(1);
# All done.
#
exit 0;
# Helper routines:
# Print the given warning messages to stderr, one per line.
# The messages should not contain trailing newlines.
#
sub warn {
foreach (@_) {
print STDERR "WARNING: $_\n";
}
}
# Print the given error messages to stderr, one per line, and exit.
# The messages should not contain trailing newlines.
#
sub bail {
foreach (@_) {
print STDERR "ERROR: $_\n";
}
exit 1;
}
# Append the given string to the classpath if it's non-empty.
#
sub appendClasspath {
my $string = shift;
$string and $classpath = "$classpath:$string";
}
# Append the given jar to the classpath if it exists.
#
sub appendJar {
my $jar = shift;
-e $jar and $classpath = "$classpath:$jar";
}
# Append the given directory to the python path if it exists.
#
sub appendPythonDir {
my $dir = shift;
-d $dir and $jythonPath = "$jythonPath:$dir";
}
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