172 lines
4.4 KiB
Text
172 lines
4.4 KiB
Text
# dpkg manual page - dpkg-trigger(1)
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#
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# Copyright © 2008-2015 Guillem Jover <guillem@debian.org>
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#
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# This 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 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 <https://www.gnu.org/licenses/>.
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=encoding utf8
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=head1 NAME
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dpkg-trigger - a package trigger utility
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=head1 SYNOPSIS
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B<dpkg-trigger>
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[I<option>...] I<trigger-name>
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B<dpkg-trigger>
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[I<option>...] I<command>
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=head1 DESCRIPTION
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B<dpkg-trigger> is a tool to explicitly activate triggers and check
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for its support on the running B<dpkg>.
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This can be used by maintainer scripts in complex and conditional
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situations where the file triggers, or the declarative B<activate>
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triggers control file directive, are insufficiently rich.
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It can also
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be used for testing and by system administrators (but note that the
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triggers won't actually be run by B<dpkg-trigger>).
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Unrecognized trigger name syntaxes are an error for B<dpkg-trigger>.
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This program was introduced in dpkg 1.14.17.
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=head1 COMMANDS
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=over
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=item B<--check-supported>
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Check if the running B<dpkg> supports triggers (usually called from a
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postinst).
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Will exit B<0> if a triggers-capable B<dpkg> has run,
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or B<1> with an error message to stderr if not.
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Normally, however,
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it is better just to activate the desired trigger with B<dpkg-trigger>.
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=item B<-?>, B<--help>
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Show the usage message and exit.
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=item B<--version>
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Show the version and exit.
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=back
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=head1 OPTIONS
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=over
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=item B<--admindir=>I<dir>
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Change the location of the B<dpkg> database.
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Defaults to I<%ADMINDIR%> if B<DPKG_ADMINDIR> has not been set.
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=item B<--root=>I<directory>
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Set the root directory to I<directory>, which sets the administrative
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directory to «I<directory>%ADMINDIR%» (since dpkg 1.21.0).
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=item B<--by-package=>I<package>
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Override trigger awaiter (normally set by B<dpkg> through the
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B<DPKG_MAINTSCRIPT_PACKAGE> environment variable of the maintainer scripts,
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naming the package to which the script belongs, and this will be used
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by default).
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=item B<--no-await>
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This option arranges that the calling package I<T> (if any) need not await
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the processing of this trigger; the interested package(s) I<I>, will not be
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added to I<T>'s trigger processing awaited list and I<T>'s status is unchanged.
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I<T> may be considered installed even though I<I> may not yet have
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processed the trigger.
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=item B<--await>
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This option does the inverse of B<--no-await> (since dpkg 1.17.21).
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If the interested package has declared a “noawait” directive, then this
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option will not be effective.
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It is currently the default behavior.
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=item B<--no-act>
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Just test, do not actually change anything.
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=back
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=head1 EXIT STATUS
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=over
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=item B<0>
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The requested action was successfully performed.
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Or a check or assertion command returned true.
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=item B<1>
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A check or assertion command returned false.
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=item B<2>
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Fatal or unrecoverable error due to invalid command-line usage, or
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interactions with the system, such as accesses to the database,
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memory allocations, etc.
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=back
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=head1 ENVIRONMENT
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=over
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=item B<DPKG_ROOT>
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If set and the B<--root> option has not been specified, it will be used as
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the filesystem root directory (since dpkg 1.21.0).
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=item B<DPKG_ADMINDIR>
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If set and the B<--admindir> option has not been specified, it will
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be used as the B<dpkg> data directory.
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=item B<DPKG_DEBUG>
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Sets the debug mask (since dpkg 1.21.10) from an octal value.
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The currently accepted flags are described in the B<dpkg --debug> option,
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but not all these flags might have an effect on this program.
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=item B<DPKG_COLORS>
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Sets the color mode (since dpkg 1.18.5).
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The currently accepted values are: B<auto> (default), B<always> and
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B<never>.
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=item B<DPKG_NLS>
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If set, it will be used to decide whether to activate Native Language Support,
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also known as internationalization (or i18n) support (since dpkg 1.22.7).
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The accepted values are: B<0> and B<1> (default).
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=back
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=head1 SEE ALSO
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L<dpkg(1)>,
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L<deb-triggers(5)>,
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B<%PKGDOCDIR%/spec/triggers.txt>.
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