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#!/usr/bin/perl -w |
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# $Id: $ |
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# |
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# Helper script to restore the environment variables previously |
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# wrapped into the environment variable GLEXEC_ENV using the |
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# glexec_wrapenv.pl script. |
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# Intended usage: |
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# export GLEXEC_ENV=`glexec_wrapenv.pl` |
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# /opt/glite/sbin/glexec glexec_unwrapenv.pl <YOUR-COMMAND> |
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# By default the following environment variables are NOT unwrapped: |
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# HOME LOGNAME USER X509_USER_PROXY _ (yes that's '_' !) |
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# A user can add more env vars to be excluded using either |
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# --exclude=A --exclude=B |
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# or |
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# --exclude=A,B,... |
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# |
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# Copyright (c) 2009 by |
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# Jan Just Keijser (janjust@nikhef.nl) |
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# Nikhef |
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# Amsterdam |
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# The Netherlands |
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|
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use strict; |
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use warnings; |
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|
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use Compress::Zlib qw(inflateInit Z_STREAM_END Z_OK); |
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use Getopt::Long qw(GetOptions); |
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use MIME::Base64 qw(decode_base64); |
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|
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# These variables are excluded by default |
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my @env_blacklist = ( "HOME", "LOGNAME", "USER", "X509_USER_PROXY", "_" ); |
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my @exclude_env; |
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|
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GetOptions ("exclude=s" => \@exclude_env); |
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@exclude_env = split( /,/, join( ',', @exclude_env, @env_blacklist) ); |
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|
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$ENV{GLEXEC_ENV} |
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or die "GLEXEC_ENV not set. No environment to pass on"; |
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|
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# First, unwrap the Base64 encoded blob |
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my $decoded_buf = decode_base64( $ENV{GLEXEC_ENV} ); |
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|
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# Then, decompress it into it's original space-separated set of Base64 blobs |
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my $x = inflateInit() |
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or die "Cannot create a inflation stream\n" ; |
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|
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my ($output, $status) = $x->inflate( \$decoded_buf ); |
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|
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die "inflation failed\n" |
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unless $status == Z_STREAM_END or $status == Z_OK; |
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|
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# Split the space-separated set of Base64 blobs again into an array |
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my @vars = split / /, $output; |
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|
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for (my $i = 0; $i <= $#vars; $i++) |
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{ |
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# Decode each Base64 encoded blob into a key=value pair |
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my $keyvalue_pair = decode_base64( $vars[$i] ); |
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my $pos = -1; |
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|
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# Look for the first '=' sign |
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if (($pos = index( $keyvalue_pair, '=' )) > -1 ) |
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{ |
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# NOTE: using tricks like (\w+) (\w+) will NOT work |
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# when environment variables span multiple lines |
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|
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# the "key" is everything before the first '=' sign |
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my $key = substr( $keyvalue_pair, 0, $pos ); |
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# the "value" is everything after the first '=' sign |
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my $value = substr( $keyvalue_pair, $pos+1 ); |
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|
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# if the variable is not on our exclusion list, set it |
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if ( ! grep { /$key/ } @exclude_env ) |
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{ |
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$ENV{$key} = $value; |
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} |
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} |
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else |
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{ |
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# this should never happen, really |
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printf STDERR "no = sign found in [$keyvalue_pair]!\n"; |
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} |
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} |
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|
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# Finally, execute the user payload command |
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exec ( @ARGV ); |
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