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# dpkg manual page - deb-preinst(5)
#
# Copyright © 2016 Guillem Jover <guillem@debian.org>
#
# This is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
=encoding utf8
=head1 NAME
deb-preinst - package pre-installation maintainer script
=head1 SYNOPSIS
B<DEBIAN/preinst>
=head1 DESCRIPTION
A package can perform several pre-installation actions via maintainer
scripts, by including an executable I<preinst> file in its control
archive (i.e. I<DEBIAN/preinst> during package creation).
The script can be called in the following ways:
=over
=item I<new-preinst> B<install>
Before the package is installed.
=item I<new-preinst> B<install> I<old-version> I<new-version>
Before a removed package is upgraded.
The I<new-version> is passed only since dpkg 1.18.5.
=item I<new-preinst> B<upgrade> I<old-version> I<new-version>
Before the package is upgraded.
The I<new-version> is passed only since dpkg 1.18.5.
=item I<old-preinst> B<abort-upgrade> I<new-version>
If I<postrm> fails during upgrade or fails on failed upgrade.
=back
=head1 SEE ALSO
L<dpkg(1)>.
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