* apt-pkg/depcache.cc:

  - if a M-A:same package is marked for reinstall, mark all it's installed
    silbings for reinstallation as well (LP: #859188)

apt-pkg/depcache.cc

@@ -1240,19 +1240,36 @@ void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
    if (unlikely(Pkg.end() == true))
       return;
 
+   APT::PackageList pkglist;
+   if (Pkg->CurrentVer != 0 &&
+       (Pkg.CurrentVer()-> MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
+   {
+      pkgCache::GrpIterator Grp = Pkg.Group();
+      for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
+      {
+	 if (P->CurrentVer != 0)
+	    pkglist.insert(P);
+      }
+   }
+   else
+      pkglist.insert(Pkg);
+
    ActionGroup group(*this);
 
-   RemoveSizes(Pkg);
-   RemoveStates(Pkg);
-   
-   StateCache &P = PkgState[Pkg->ID];
-   if (To == true)
-      P.iFlags |= ReInstall;
-   else
-      P.iFlags &= ~ReInstall;
-   
-   AddStates(Pkg);
-   AddSizes(Pkg);
+   for (APT::PackageList::const_iterator Pkg = pkglist.begin(); Pkg != pkglist.end(); ++Pkg)
+   {
+      RemoveSizes(Pkg);
+      RemoveStates(Pkg);
+
+      StateCache &P = PkgState[Pkg->ID];
+      if (To == true)
+	 P.iFlags |= ReInstall;
+      else
+	 P.iFlags &= ~ReInstall;
+
+      AddStates(Pkg);
+      AddSizes(Pkg);
+   }
 }
 									/*}}}*/
 // DepCache::SetCandidateVersion - Change the candidate version		/*{{{*/

debian/changelog

@@ -4,6 +4,9 @@ apt (0.8.16~exp13) UNRELEASED; urgency=low
   * apt-pkg/deb/dpkgpm.cc:
     - chroot if needed before dpkg --assert-multi-arch
     - ensure that dpkg binary doesn't have the chroot-directory prefixed
+  * apt-pkg/depcache.cc:
+    - if a M-A:same package is marked for reinstall, mark all it's installed
+      silbings for reinstallation as well (LP: #859188)
 
   [ Steve Langasek ]
   * cmdline/apt-get.cc:
@@ -17,7 +20,7 @@ apt (0.8.16~exp13) UNRELEASED; urgency=low
     - use a signed int instead of short for score calculation as upgrades
       become so big now that it can overflow (Closes: #657732, LP: #917173)
 
- -- David Kalnischkies <kalnischkies@gmail.com>  Sun, 29 Jan 2012 14:44:19 +0100
+ -- David Kalnischkies <kalnischkies@gmail.com>  Sun, 29 Jan 2012 15:22:50 +0100
 
 apt (0.8.16~exp12) experimental; urgency=low
 

test/integration/test-ubuntu-bug-859188-multiarch-reinstall

@@ -0,0 +1,28 @@
+#!/bin/sh
+set -e
+
+TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+setupenvironment
+configarchitecture 'amd64' 'i386' 'armel'
+
+buildsimplenativepackage 'libsame' 'amd64,i386,armel' '1.0' 'unstable' 'Multi-Arch: same'
+
+# FIXME: hack around dpkg's current inability to handle multiarch, a clean install would be better…
+insertinstalledpackage 'libsame' 'amd64,i386' '1.0' 'Multi-Arch: same'
+sed -e 's#/installed#/unstable#' -e 's#Installed-Size: 42#Installed-Size: 1#' -i rootdir/var/lib/dpkg/status
+
+setupaptarchive
+
+REINSTALL='Reading package lists...
+Building dependency tree...
+0 upgraded, 0 newly installed, 2 reinstalled, 0 to remove and 0 not upgraded.
+Inst libsame [1.0] (1.0 unstable [amd64])
+Inst libsame:i386 [1.0] (1.0 unstable [i386])
+Conf libsame (1.0 unstable [amd64])
+Conf libsame:i386 (1.0 unstable [i386])'
+
+testequal "$REINSTALL" aptget install --reinstall libsame -s
+testequal "$REINSTALL" aptget install --reinstall libsame:amd64 -s
+testequal "$REINSTALL" aptget install --reinstall libsame:i386 -s
+testequal "$REINSTALL" aptget install --reinstall libsame:amd64 libsame:i386 -s