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@@ -0,0 +1,105 @@
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+# Copyright © 2012 Guillem Jover <guillem@debian.org>
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+#
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 2 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+package Dpkg::BuildEnv;
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+
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+use strict;
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+use warnings;
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+
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+our $VERSION = "0.01";
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+
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+my %env_modified = ();
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+my %env_accessed = ();
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+
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+=encoding utf8
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+
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+=head1 NAME
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+
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+Dpkg::BuildEnv - track build environment
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+
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+=head1 DESCRIPTION
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+
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+The Dpkg::BuildEnv module is used by dpkg-buildflags to track the build
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+environment variables being used and modified.
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+
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+=head1 FUNCTIONS
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+
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+=over 4
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+
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+=item $bf->set($varname, $value)
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+
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+Update the build environment variable $varname with value $value. Record
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+it as being accessed and modified.
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+
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+=cut
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+
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+sub set {
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+ my ($varname, $value) = @_;
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+ $env_modified{$varname} = 1;
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+ $env_accessed{$varname} = 1;
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+ $ENV{$varname} = $value;
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+}
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+
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+=item $bf->get($varname)
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+
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+Get the build environment variable $varname value. Record it as being
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+accessed.
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+
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+=cut
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+
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+sub get {
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+ my ($varname) = @_;
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+ $env_accessed{$varname} = 1;
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+ return $ENV{$varname};
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+}
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+
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+=item $bf->has($varname)
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+
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+Return a boolean indicating whether the environment variable exists.
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+Record it as being accessed.
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+
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+=cut
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+
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+sub has {
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+ my ($varname) = @_;
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+ $env_accessed{$varname} = 1;
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+ return exists $ENV{$varname};
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+}
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+
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+=item my @list = $bf->list_accessed()
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+
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+Returns a list of all environment variables that have been accessed.
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+
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+=cut
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+
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+sub list_accessed {
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+ return sort keys %env_accessed;
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+}
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+
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+=item my @list = $bf->list_modified()
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+
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+Returns a list of all environment variables that have been modified.
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+
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+=cut
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+
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+sub list_modified {
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+ return sort keys %env_modified;
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+}
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+
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+=back
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+
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+=cut
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+
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+1;
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Guillem Jover