From 3d1be93dc4242df2b93de632715a8aa7dd34f96f Mon Sep 17 00:00:00 2001
From: David Kalnischkies <kalnischkies@gmail.com>
Date: Fri, 28 Jun 2013 20:42:18 +0200
Subject: implement arch+= and arch-= for sources.list

Default is to acquire all architectures from APT::Architectures which
can be changed by arch=, but this isn't very flexible if you want
"mostly" the default as you have to hardcode the architectures then,
so arch-= and arch+= can be used to add/remove architectures from the
default set.

On a machine with 'amd64' and 'i386' configured the lines:
 deb [arch+=armel] http://example.org/debian wheezy rocks
 deb [arch-=amd64] http://example.org/debian jessie rocks
will result in the download of:
 wheezy Packages for 'amd64', 'i386' and 'armel'
 jessie Packages for 'i386'
---
 apt-pkg/deb/debmetaindex.cc | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

(limited to 'apt-pkg/deb/debmetaindex.cc')

diff --git a/apt-pkg/deb/debmetaindex.cc b/apt-pkg/deb/debmetaindex.cc
index 7a88d71e3..7dd5ab2bf 100644
--- a/apt-pkg/deb/debmetaindex.cc
+++ b/apt-pkg/deb/debmetaindex.cc
@@ -373,10 +373,29 @@ class debSLTypeDebian : public pkgSourceList::Type
 			   string const &Dist, string const &Section,
 			   bool const &IsSrc, map<string, string> const &Options) const
    {
-      map<string, string>::const_iterator const arch = Options.find("arch");
-      vector<string> const Archs =
+      // parse arch=, arch+= and arch-= settings
+      map<string, string>::const_iterator arch = Options.find("arch");
+      vector<string> Archs =
 		(arch != Options.end()) ? VectorizeString(arch->second, ',') :
 				APT::Configuration::getArchitectures();
+      if ((arch = Options.find("arch+")) != Options.end())
+      {
+	 std::vector<std::string> const plusArch = VectorizeString(arch->second, ',');
+	 for (std::vector<std::string>::const_iterator plus = plusArch.begin(); plus != plusArch.end(); ++plus)
+	    if (std::find(Archs.begin(), Archs.end(), *plus) == Archs.end())
+	       Archs.push_back(*plus);
+      }
+      if ((arch = Options.find("arch-")) != Options.end())
+      {
+	 std::vector<std::string> const minusArch = VectorizeString(arch->second, ',');
+	 for (std::vector<std::string>::const_iterator minus = minusArch.begin(); minus != minusArch.end(); ++minus)
+	 {
+	    std::vector<std::string>::iterator kill = std::find(Archs.begin(), Archs.end(), *minus);
+	    if (kill != Archs.end())
+	       Archs.erase(kill);
+	 }
+      }
+
       map<string, string>::const_iterator const trusted = Options.find("trusted");
 
       for (vector<metaIndex *>::const_iterator I = List.begin();
-- 
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