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Re: Bug#758234: transitive dependencies

[ re-post, signed ]

I'd like to formally propose the following Policy change to fix the
"depend on packages with lower dependencies" non-problem.

This does simplify current practice, but unfortunately not Policy itself,
as adhering to policy shouldn't allow you to break debootstrap. :-P

This change is git-pull-able: git://git.smurf.noris.de/policy.git#master

commit f534bae9ccb69b70e58e1f34b9aa143d35ac836e
Author: Matthias Urlichs <matthias@urlichs.de>
Date:   Thu Nov 13 13:15:31 2014 +0100

    Policy: Use dependencies instead of priority adherence
    Raising the policy of dependent libraries is unnecessary busy-work
    which current tools do not require.
    This change updates Policy to conform to current practice and
    tools' requirements, particularly debootstrap.

diff --git a/debian/changelog b/debian/changelog
index 17e9330..8ed6dba 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,7 +1,11 @@
 debian-policy ( unstable; urgency=low
+  [ Bill Allombert ]
+  [ Matthias Urlichs ]
+  * Policy: Use dependencies instead of priority adherence
  -- Bill Allombert <ballombe@debian.org>  Wed, 17 Sep 2014 20:35:51 +0200
 debian-policy ( unstable; urgency=low
diff --git a/policy.sgml b/policy.sgml
index 6eac491..f97ef10 100644
--- a/policy.sgml
+++ b/policy.sgml
@@ -868,10 +868,21 @@ zope.
-	  Packages must not depend on packages with lower priority
-	  values (excluding build-time dependencies).  In order to
-	  ensure this, the priorities of one or more packages may need
-	  to be adjusted.
+	  Packages may depend on other packages with lower priority values.
+	  These other packages, or their dependencies, must not conflict with
+	  another higher-priority package.<footnote>
+	    Debian does not require its base-system installation scripts to employ a
+	    full-featured dependency resolver; this rule ensures that "install
+	    all <tt>important</tt> packages and their open dependencies" works
+	    and results in a consistent and bootable system.
+	  </footnote>
+	</p>
+	<p>
+	  This restriction does not apply to packages of priority
+	  <tt>optional</tt> or lower. It applies transitively.
+	  It does not apply if a dependency is already satisfied by another
+	  higher-priority package. If alternative dependencies are used,
+	  it only applies to the first alternative(s).
@@ -9992,11 +10003,10 @@ name ["<var>syshostname</var>"]:
 	    any package dependencies necessary to satisfy their
 	    runtime requirements when using the X Window System.  If
 	    such a package is of higher priority than the X packages
-	    on which it depends, it is required that either the
+	    on which it depends, it is recommended that either the
 	    X-specific components be split into a separate package, or
 	    that an alternative version of the package, which includes
-	    X support, be provided, or that the package's priority be
-	    lowered.
+	    X support, be provided.
-- Matthias Urlichs

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