deb-triggers(5)                                                     dpkg suite                                                     deb-triggers(5)

NAME

       deb-triggers - package triggers

SYNOPSIS

       triggers

DESCRIPTION

       A  package  declares  its  relationship to some trigger(s) by including a triggers file in its control archive (i.e. DEBIAN/triggers during
       package creation).

       This file contains directives, one per line. Leading and trailing whitespace and everything after the first # on any line will be  trimmed,
       and empty lines will be ignored.

       The trigger control directives currently supported are:

       interest trigger-name
       interest-await trigger-name
       interest-noawait trigger-name

              Specifies  that  the  package is interested in the named trigger. All triggers in which a package is interested must be listed using
              this directive in the triggers control file. The "noawait" variant does not put the triggering packages in  triggers-awaited  state.
              This should be used when the functionality provided by the trigger is not crucial.

       activate trigger-name
       activate-await trigger-name
       activate-noawait trigger-name

              Arranges that changes to this package's state will activate the specified trigger. The trigger will be activated at the start of the
              following operations: unpack, configure, remove (including for the benefit of a conflicting package), purge  and  deconfigure.   The
              "noawait"  variant  does  not  put  the  triggering  packages  in triggers-awaited state. This should be used when the functionality
              provided by the trigger is not crucial.

              If this package disappears during the unpacking of another package the trigger will be activated when  the  disappearance  is  noted
              towards  the  end  of the unpack. Trigger processing, and transition from triggers-awaited to installed, does not cause activations.
              In the case of unpack, triggers mentioned in both the old and new versions of the package will be activated.

       Unknown directives are an error which will prevent installation of the package.

       The "-noawait" variants should always be favored when possible since triggering packages are not put in triggers-awaited state and can thus
       be  immediately  configured without requiring the processing of the trigger.  If the triggering packages are dependencies of other upgraded
       packages, it will avoid an early trigger processing run and make it possible to run the trigger only once as one of the last steps  of  the
       upgrade.

       The "-noawait" variants are supported since dpkg 1.16.1, and will lead to errors if used with an older dpkg.

       The "-await" alias variants are supported since dpkg 1.17.21, and will lead to errors if used with an older dpkg.

SEE ALSO

       dpkg-trigger(1), dpkg(1), /usr/share/doc/dpkg-dev/triggers.txt.gz.

1.19.0.5                                                            2018-04-16                                                     deb-triggers(5)