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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 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.

       The  "-await" alias variants are	only supported since dpkg 1.17.21, and
       will lead to errors if used with	an older dpkg. It is thus  recommended
       to  add	a "Pre-Depends:	dpkg (>= 1.17.21)" to any package that wish to
       use those directives.

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

1.18.24				  2017-05-17		       deb-triggers(5)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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