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-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-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 are only supported since dpkg 1.16.1, and will lead to  errors  if
       used  with  an older dpkg. It is thus recommended to add a "Pre-Depends: dpkg (>= 1.16.1)"
       to any package that wish to use those directives.

SEE ALSO

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