On Thu, 20 Jun 2019 11:00:58 +0100, Sean Whitton wrote: > On Fri 07 Jun 2019 at 10:50AM +01, Dominic Hargreaves wrote: > > > diff --git a/policy/ch-relationships.rst b/policy/ch-relationships.rst > > index 1d790e8..3b68420 100644 > > --- a/policy/ch-relationships.rst > > +++ b/policy/ch-relationships.rst > > @@ -17,15 +17,16 @@ package names, separated by vertical bar (pipe) symbols ``|``. In such a > > case, that part of the dependency can be satisfied by any one of the > > alternative packages. [#]_ > > > > -All of the fields except for ``Provides`` may restrict their > > -applicability to particular versions of each named package. This is done > > -in parentheses after each individual package name; the parentheses > > -should contain a relation from the list below followed by a version > > -number, in the format described in :ref:`s-f-Version`. > > +All of the fields may restrict their applicability to particular versions > > +of each named package. This is done in parentheses after each individual > > +package name; the parentheses should contain a relation from the list > > +below followed by a version number, in the format described in > > +:ref:`s-f-Version`. > > > > The relations allowed are ``<<``, ``<=``, ``=``, ``>=`` and ``>>`` for > > strictly earlier, earlier or equal, exactly equal, later or equal and > > -strictly later, respectively. [#]_ > > +strictly later, respectively. The exception is the Provides field, for > > +which only ``=`` is allowed. [#]_ > > > > Whitespace may appear at any point in the version specification subject > > to the rules in :ref:`s-controlsyntax`, and must appear > > @@ -446,17 +447,43 @@ they can say: > > and the ``bar-plus`` package will now also satisfy the dependency for > > the ``foo`` package. > > > > -If a relationship field has a version number attached, only real > > -packages will be considered to see whether the relationship is satisfied > > -(or the prohibition violated, for a conflict or breakage). In other > > -words, if a version number is specified, this is a request to ignore all > > -``Provides`` for that package name and consider only real packages. The > > -package manager will assume that a package providing that virtual > > -package is not of the "right" version. A ``Provides`` field may not > > -contain version numbers, and the version number of the concrete package > > -which provides a particular virtual package will not be considered when > > -considering a dependency on or conflict with the virtual package name. > > -[#]_ > > +A ``Provides`` field may contain version numbers, and such a version number > > +will be considered when considering a dependency on or conflict with the > > +virtual package name. [#]_ For example, given the following packages: > > + > > +:: > > + > > + Package: foo > > + Depends: bar (>= 1.0) > > + > > + Package: bar > > + Version: 0.9 > > + > > + Package: bar-plus > > + Provides: bar (= 1.0) > > + > > +the ``bar-plus`` package will again satisfy the dependency for > > +the ``foo`` package with the virtual package name. [#]_ If the ``Provides`` > > +field does not specify a version number, it will not satisfy versioned > > +dependencies or violate versioned ``Conflicts`` or ``Breaks``. For example, > > +given the following packages: > > + > > +:: > > + > > + Package: foo > > + Depends: bar (>= 1.0) > > + > > + Package: bar > > + Version: 0.9 > > + > > + Package: bar-plus > > + Provides: bar (= 1.0) > > + > > + Package: bar-clone > > + Provides: bar > > + > > +the ``bar-plus`` package will satisfy the dependency for the ``foo`` > > +package, but the ``bar-clone`` package will not. > > > > To specify which of a set of real packages should be the default to > > satisfy a particular dependency on a virtual package, list the real > > @@ -670,10 +697,8 @@ dependencies. > > together and then configured in their dependency order. > > > > .. [#] > > - It is possible that a future release of ``dpkg`` may add the ability > > - to specify a version number for each virtual package it provides. > > - This feature is not yet present, however, and is expected to be used > > - only infrequently. > > + This functionality was introduced in dpkg 1.17.11 and newer and > > + full support has been provided in the Debian archive since 2018. > > > > .. [#] > > To see why ``Breaks`` is normally needed in addition to ``Replaces``, > > Seconded. Thank you again. Seconded as well. Cheers, gregor -- .''`. https://info.comodo.priv.at -- Debian Developer https://www.debian.org : :' : OpenPGP fingerprint D1E1 316E 93A7 60A8 104D 85FA BB3A 6801 8649 AA06 `. `' Member VIBE!AT & SPI Inc. -- Supporter Free Software Foundation Europe `- NP: U2: With our Without You
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