Create implicit dependencies needed for Multi-Arch handling

diff --git a/apt-pkg/pkgcachegen.cc b/apt-pkg/pkgcachegen.cc
index a4ca9df..037c0cb 100644 (file)
--- a/apt-pkg/pkgcachegen.cc
+++ b/apt-pkg/pkgcachegen.cc
@@ -532,11 +532,14 @@ bool pkgCacheGenerator::FinishCache(OpProgress &Progress) {
                        string const PkgName = G.Name();
                        for (pkgCache::PkgIterator P = G.PackageList(); P.end() != true; P = G.NextPkg(P)) {
                                for (pkgCache::VerIterator V = P.VersionList(); V.end() != true; V++) {
-                                       // Arch all packages are "co-installable"
-                                       if (V->MultiArch == pkgCache::Version::All)
-                                               continue;
                                        string const Arch = V.Arch();
                                        map_ptrloc *OldDepLast = NULL;
+                                       /* MultiArch handling introduces a lot of implicit Dependencies:
+                                          - MultiArch: same → Co-Installable if they have the same version
+                                          - Architecture: all → Need to be Co-Installable for internal reasons
+                                          - All others conflict with all other group members */
+                                       bool const coInstall = (V->MultiArch == pkgCache::Version::All ||
+                                                               V->MultiArch == pkgCache::Version::Same);
                                        for (vector<string>::const_iterator A = archs.begin(); A != archs.end(); ++A) {
                                                if (*A == Arch)
                                                        continue;
@@ -546,10 +549,24 @@ bool pkgCacheGenerator::FinishCache(OpProgress &Progress) {
                                                pkgCache::PkgIterator D = G.FindPkg(*A);
                                                if (D.end() == true)
                                                        continue;
-                                               // Conflicts: ${self}:other
-                                               NewDepends(D, V, "",
-                                                       pkgCache::Dep::NoOp, pkgCache::Dep::Conflicts,
-                                                       OldDepLast);
+                                               if (coInstall == true) {
+                                                       // Replaces: ${self}:other ( << ${binary:Version})
+                                                       NewDepends(D, V, V.VerStr(),
+                                                                  pkgCache::Dep::Less, pkgCache::Dep::Replaces,
+                                                                  OldDepLast);
+                                                       // Breaks: ${self}:other (!= ${binary:Version})
+                                                       NewDepends(D, V, V.VerStr(),
+                                                                  pkgCache::Dep::Less, pkgCache::Dep::DpkgBreaks,
+                                                                  OldDepLast);
+                                                       NewDepends(D, V, V.VerStr(),
+                                                                  pkgCache::Dep::Greater, pkgCache::Dep::DpkgBreaks,
+                                                                  OldDepLast);
+                                               } else {
+                                                       // Conflicts: ${self}:other
+                                                       NewDepends(D, V, "",
+                                                                  pkgCache::Dep::NoOp, pkgCache::Dep::Conflicts,
+                                                                  OldDepLast);
+                                               }
                                        }
                                }
                        }