show a Release-Notes URI if infos were changed

This gives the repository owner a chance to explain why this change was
needed – e.g. explaining the organisational changes or simply detailing
the changes in the new release made. Note that this URI is also shown
if the change is accepted, so it also draws attention to release notes
of minor updates (if users watch apt output closely).

1 files changed, 11 insertions, 0 deletions

diff --git a/apt-pkg/acquire-item.cc b/apt-pkg/acquire-item.cc
index f5ff8288b..ddcff5808 100644
--- a/apt-pkg/acquire-item.cc
+++ b/apt-pkg/acquire-item.cc
@@ -1623,6 +1623,7 @@ bool pkgAcqMetaBase::VerifyVendor(string const &)			/*{{{*/
 	 { "Codename", AllowInfoChange, &metaIndex::GetCodename },
 	 { nullptr, false, nullptr }
       };
+      _error->PushToStack();
       auto const CheckReleaseInfo = [&](char const * const Type, bool const AllowChange, decltype(checkers[0].Getter) const Getter) {
 	 std::string const Last = (TransactionManager->LastMetaIndexParser->*Getter)();
 	 std::string const Now = (TransactionManager->MetaIndexParser->*Getter)();
@@ -1655,6 +1656,16 @@ bool pkgAcqMetaBase::VerifyVendor(string const &)			/*{{{*/
 	    CRI &= Allow;
 	 }
       }
+      if (_error->empty(GlobalError::NOTICE) == false)
+      {
+	 auto const notes = TransactionManager->MetaIndexParser->GetReleaseNotes();
+	 if (notes.empty() == false)
+	 {
+	    // TRANSLATOR: the "this" refers to changes in the repository like a new release or owner change
+	    _error->Notice(_("More information about this can be found online in the Release notes at: %s"), notes.c_str());
+	 }
+      }
+      _error->MergeWithStack();
       if (CRI == false)
       {
 	 // TRANSLATOR: %s is the name of the manpage in question, e.g. apt-secure(8)