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.