dpkg-trigger(1)

NAME
dpkg-trigger - a package trigger utility

SYNOPSIS
dpkg-trigger [option...] trigger-name

dpkg-trigger [option...] command

DESCRIPTION
dpkg-trigger is a tool to explicitly activate triggers and check for its support on the running dpkg.

This can be used by maintainer scripts in complex and conditional situations where the file triggers, or the declarative activate triggers control file directive, are insufficiently rich. It can also be used for testing and by system administrators (but note that the triggers won't actually be run by dpkg-trigger).

Unrecognized trigger name syntaxes are an error for dpkg-trigger.

This program was introduced in dpkg 1.14.17.

COMMANDS

--check-supported
    Check if the running dpkg supports triggers (usually called from a postinst). Will exit 0 if a triggers-capable dpkg has run, or 1 with an error message to stderr if not. Normally, however, it is better just to activate the desired trigger with dpkg-trigger.

-?, --help
    Show the usage message and exit.

--version
    Show the version and exit.

OPTIONS

--admindir=dir
    Change the location of the dpkg database. Defaults to /var/lib/dpkg if DPKG_ADMINDIR has not been set.

--root=directory
    Set the root directory to directory, which sets the administrative directory to «directory/var/lib/dpkg» (since dpkg 1.21.0).

--by-package=package
    Override trigger awaiter (normally set by dpkg through the DPKG_MAINTSCRIPT_PACKAGE environment variable of the maintainer scripts, naming the package to which the script belongs, and this will be used by default).

--no-await
    This option arranges that the calling package T (if any) need not await the processing of this trigger; the interested package(s) I, will not be added to T's trigger processing awaited list and T's status is unchanged. T may be considered installed even though I may not yet have processed the trigger.

--await
    This option does the inverse of --no-await (since dpkg 1.17.21). If the interested package has declared a “noawait” directive, then this option will not be effective. It is currently the default behavior.

--no-act
    Just test, do not actually change anything.

EXIT STATUS

0   The requested action was successfully performed. Or a check or assertion command returned true.

1   A check or assertion command returned false.

2   Fatal or unrecoverable error due to invalid command-line usage, or interactions with the system, such as accesses to the database, memory allocations, etc.

ENVIRONMENT

DPKG_ROOT
    If set and the --root option has not been specified, it will be used as the filesystem root directory (since dpkg 1.21.0).

DPKG_ADMINDIR
    If set and the --admindir option has not been specified, it will be used as the dpkg data directory.

DPKG_DEBUG
    Sets the debug mask (since dpkg 1.21.10) from an octal value. The currently accepted flags are described in the dpkg --debug option, but not all these flags might have an effect on this program.

DPKG_COLORS
    Sets the color mode (since dpkg 1.18.5). The currently accepted values are: auto (default), always and never.

DPKG_NLS
    If set, it will be used to decide whether to activate Native Language Support, also known as internationalization (or i18n) support (since dpkg 1.22.7). The accepted values are: 0 and 1 (default).

SEE ALSO
dpkg(1), deb-triggers(5), /usr/share/doc/dpkg/spec/triggers.txt.