X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/430481e794a3fa2e75022c67e129b54d192ad54c..d27daedb6a0bf672508072100f20233d08ccf0e0:/apt-pkg/acquire-item.cc

diff --git a/apt-pkg/acquire-item.cc b/apt-pkg/acquire-item.cc
index e0f02b8e2..7f31d1449 100644
--- a/apt-pkg/acquire-item.cc
+++ b/apt-pkg/acquire-item.cc
@@ -1075,6 +1075,16 @@ void pkgAcqMetaBase::QueueIndexes(bool const verify)			/*{{{*/
 	    strprintf(ErrorText, _("Unable to find expected entry '%s' in Release file (Wrong sources.list entry or malformed file)"), Target->MetaKey.c_str());
 	    return;
 	 }
+	 else
+	 {
+	    auto const hashes = GetExpectedHashesFor(Target->MetaKey);
+	    if (hashes.usable() == false && hashes.empty() == false)
+	    {
+	       _error->Warning(_("Skipping acquire of configured file '%s' as repository '%s' provides only weak security information for it"),
+			Target->MetaKey.c_str(), TransactionManager->Target.Description.c_str());
+	       continue;
+	    }
+	 }
 
 	 // autoselect the compression method
 	 std::vector<std::string> types = VectorizeString(Target->Option(IndexTarget::COMPRESSIONTYPES), ' ');
@@ -1837,10 +1847,18 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)	/*{{{*/
       std::clog << "Server-Current: " << ServerHashes.find(NULL)->toStr() << " and we start at "
 	 << CurrentPackagesFile << " " << LocalHashes.FileSize() << " " << LocalHashes.find(NULL)->toStr() << std::endl;
 
+   // historically, older hashes have more info than newer ones, so start
+   // collecting with older ones first to avoid implementing complicated
+   // information merging techniques… a failure is after all always
+   // recoverable with a complete file and hashes aren't changed that often.
+   std::vector<char const *> types;
+   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+      types.push_back(*type);
+
    // parse all of (provided) history
    vector<DiffInfo> available_patches;
    bool firstAcceptedHashes = true;
-   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+   for (auto type = types.crbegin(); type != types.crend(); ++type)
    {
       if (LocalHashes.find(*type) == NULL)
 	 continue;
@@ -1898,7 +1916,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)	/*{{{*/
       return false;
    }
 
-   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+   for (auto type = types.crbegin(); type != types.crend(); ++type)
    {
       if (LocalHashes.find(*type) == NULL)
 	 continue;
@@ -1938,7 +1956,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)	/*{{{*/
       }
    }
 
-   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+   for (auto type = types.crbegin(); type != types.crend(); ++type)
    {
       std::string tagname = *type;
       tagname.append("-Download");