fix and document on the fly compressor config

[apt.git] / apt-pkg / cachefile.cc

diff --git a/apt-pkg/cachefile.cc b/apt-pkg/cachefile.cc
index aaa2436c5d787fcf4bcad623b1f93afc37efb963..b5f32fc293cb2493619cce8326ca3cbd28bd0ea0 100644 (file)
--- a/apt-pkg/cachefile.cc
+++ b/apt-pkg/cachefile.cc
@@ -26,11 +26,13 @@
 #include <apt-pkg/depcache.h>
 #include <apt-pkg/mmap.h>
 #include <apt-pkg/pkgcache.h>
+#include <apt-pkg/indexfile.h>
 
 #include <string.h>
 #include <unistd.h>
 #include <string>
 #include <vector>
+#include <memory>
 
 #include <apti18n.h>
                                                                        /*}}}*/
@@ -68,9 +70,13 @@ public:
    ScopedErrorMerge() { _error->PushToStack(); }
    ~ScopedErrorMerge() { _error->MergeWithStack(); }
 };
+
 bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock)
 {
-   if (Cache != NULL)
+   std::unique_ptr<pkgCache> Cache;
+   std::unique_ptr<MMap> Map;
+
+   if (this->Cache != NULL)
       return true;
 
    ScopedErrorMerge sem;
@@ -79,9 +85,16 @@ bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock)
       FileFd file(_config->FindFile("Dir::Cache::pkgcache"), FileFd::ReadOnly);
       if (file.IsOpen() == false || file.Failed())
         return false;
-      Map = new MMap(file, MMap::Public|MMap::ReadOnly);
-      Cache = new pkgCache(Map);
-      return _error->PendingError() == false;
+      Map.reset(new MMap(file, MMap::Public|MMap::ReadOnly));
+      if (unlikely(Map->validData() == false))
+        return false;
+      Cache.reset(new pkgCache(Map.get()));
+      if (_error->PendingError() == true)
+        return false;
+
+      this->Cache = Cache.release();
+      this->Map = Map.release();
+      return true;
    }
 
    if (WithLock == true)
@@ -91,10 +104,15 @@ bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock)
    if (_error->PendingError() == true)
       return false;
 
-   BuildSourceList(Progress);
+   if (BuildSourceList(Progress) == false)
+      return false;
 
    // Read the caches
-   bool Res = pkgCacheGenerator::MakeStatusCache(*SrcList,Progress,&Map, true);
+   MMap *TmpMap = nullptr;
+   pkgCache *TmpCache = nullptr;
+   bool Res = pkgCacheGenerator::MakeStatusCache(*SrcList,Progress,&TmpMap, &TmpCache, true);
+   Map.reset(TmpMap);
+   Cache.reset(TmpCache);
    if (Progress != NULL)
       Progress->Done();
    if (Res == false)
@@ -104,9 +122,13 @@ bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock)
    if (_error->PendingError() == true)
       _error->Warning(_("You may want to run apt-get update to correct these problems"));
 
-   Cache = new pkgCache(Map);
+   if (Cache == nullptr)
+      Cache.reset(new pkgCache(Map.get()));
    if (_error->PendingError() == true)
       return false;
+   this->Map = Map.release();
+   this->Cache = Cache.release();
+
    return true;
 }
                                                                        /*}}}*/
@@ -115,12 +137,14 @@ bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock)
 /* */
 bool pkgCacheFile::BuildSourceList(OpProgress * /*Progress*/)
 {
-   if (SrcList != NULL)
+   std::unique_ptr<pkgSourceList> SrcList;
+   if (this->SrcList != NULL)
       return true;
 
-   SrcList = new pkgSourceList();
+   SrcList.reset(new pkgSourceList());
    if (SrcList->ReadMainList() == false)
       return _error->Error(_("The list of sources could not be read."));
+   this->SrcList = SrcList.release();
    return true;
 }
                                                                        /*}}}*/
@@ -129,16 +153,18 @@ bool pkgCacheFile::BuildSourceList(OpProgress * /*Progress*/)
 /* */
 bool pkgCacheFile::BuildPolicy(OpProgress * /*Progress*/)
 {
-   if (Policy != NULL)
+   std::unique_ptr<pkgPolicy> Policy;
+   if (this->Policy != NULL)
       return true;
 
-   Policy = new pkgPolicy(Cache);
+   Policy.reset(new pkgPolicy(Cache));
    if (_error->PendingError() == true)
       return false;
 
    if (ReadPinFile(*Policy) == false || ReadPinDir(*Policy) == false)
       return false;
 
+   this->Policy = Policy.release();
    return true;
 }
                                                                        /*}}}*/
@@ -147,17 +173,24 @@ bool pkgCacheFile::BuildPolicy(OpProgress * /*Progress*/)
 /* */
 bool pkgCacheFile::BuildDepCache(OpProgress *Progress)
 {
-   if (DCache != NULL)
+   if (BuildCaches(Progress, false) == false)
+      return false;
+
+   std::unique_ptr<pkgDepCache> DCache;
+   if (this->DCache != NULL)
       return true;
 
    if (BuildPolicy(Progress) == false)
       return false;
 
-   DCache = new pkgDepCache(Cache,Policy);
+   DCache.reset(new pkgDepCache(Cache,Policy));
    if (_error->PendingError() == true)
       return false;
+   if (DCache->Init(Progress) == false)
+      return false;
 
-   return DCache->Init(Progress);
+   this->DCache = DCache.release();
+   return true;
 }
                                                                        /*}}}*/
 // CacheFile::Open - Open the cache files, creating if necessary       /*{{{*/
@@ -182,6 +215,66 @@ bool pkgCacheFile::Open(OpProgress *Progress, bool WithLock)
    return true;
 }
                                                                        /*}}}*/
+bool pkgCacheFile::AddIndexFile(pkgIndexFile * const File)             /*{{{*/
+{
+   if (SrcList == NULL)
+      if (BuildSourceList() == false)
+        return false;
+   SrcList->AddVolatileFile(File);
+
+   if (Cache == nullptr || File->HasPackages() == false || File->Exists() == false)
+      return true;
+
+   if (File->FindInCache(*Cache).end() == false)
+      return _error->Warning("Duplicate sources.list entry %s",
+           File->Describe().c_str());
+
+   if (ExternOwner == false)
+   {
+      delete DCache;
+      delete Cache;
+   }
+   delete Policy;
+   DCache = NULL;
+   Policy = NULL;
+   Cache = NULL;
+
+   if (ExternOwner == false)
+   {
+      // a dynamic mmap means that we have build at least parts of the cache
+      // in memory – which we might or might not have written to disk.
+      // Throwing away would therefore be a very costly operation we want to avoid
+      DynamicMMap * dynmmap = dynamic_cast<DynamicMMap*>(Map);
+      if (dynmmap != nullptr)
+      {
+        {
+           pkgCacheGenerator Gen(dynmmap, nullptr);
+           if (Gen.Start() == false || File->Merge(Gen, nullptr) == false)
+              return false;
+        }
+        Cache = new pkgCache(Map);
+        if (_error->PendingError() == true) {
+           delete Cache;
+           Cache = nullptr;
+           return false;
+        }
+        return true;
+      }
+      else
+      {
+        delete Map;
+        Map = NULL;
+      }
+   }
+   else
+   {
+      ExternOwner = false;
+      Map = NULL;
+   }
+   _system->UnLock(true);
+   return true;
+}
+                                                                       /*}}}*/
 // CacheFile::RemoveCaches - remove all cache files from disk          /*{{{*/
 // ---------------------------------------------------------------------
 /* */