Advanced documentation for 'apt-get install' command, mentioned upgrading possibility.

[apt.git] / apt-pkg / acquire-item.cc

diff --git a/apt-pkg/acquire-item.cc b/apt-pkg/acquire-item.cc
index f3784a58bc9d2e9dce1963b8d360fd3ed360378a..ae8ff220594e311bc0909f9a8f50a7cfb5c4e48a 100644 (file)
--- a/apt-pkg/acquire-item.cc
+++ b/apt-pkg/acquire-item.cc
@@ -345,7 +345,7 @@ void pkgAcqDiffIndex::Done(string Message,unsigned long Size,string Md5Hash,
  */
 pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire *Owner,
                                   string URI,string URIDesc,string ShortDesc,
-                                  HashString ExpectedMD5, 
+                                  HashString ExpectedHash, 
                                   vector<DiffInfo> diffs)
    : Item(Owner), RealURI(URI), ExpectedHash(ExpectedHash), 
      available_patches(diffs)
@@ -568,9 +568,9 @@ pkgAcqIndex::pkgAcqIndex(pkgAcquire *Owner,
       else 
         CompressionExtension = ".gz";
    } else {
-      CompressionExtension = comprExt;
+      CompressionExtension = (comprExt == "plain" ? "" : comprExt);
    }
-   Desc.URI = URI + CompressionExtension; 
+   Desc.URI = URI + CompressionExtension;
 
    Desc.Description = URIDesc;
    Desc.Owner = this;
@@ -597,19 +597,30 @@ string pkgAcqIndex::Custom600Headers()
 
 void pkgAcqIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 {
+   bool descChanged = false;
    // no .bz2 found, retry with .gz
    if(Desc.URI.substr(Desc.URI.size()-3) == "bz2") {
-      Desc.URI = Desc.URI.substr(0,Desc.URI.size()-3) + "gz"; 
+      Desc.URI = Desc.URI.substr(0,Desc.URI.size()-3) + "gz";
 
-      // retry with a gzip one 
-      new pkgAcqIndex(Owner, RealURI, Desc.Description,Desc.ShortDesc, 
+      new pkgAcqIndex(Owner, RealURI, Desc.Description,Desc.ShortDesc,
                      ExpectedHash, string(".gz"));
+         descChanged = true;
+   }
+   // no .gz found, retry with uncompressed
+   else if(Desc.URI.substr(Desc.URI.size()-2) == "gz") {
+      Desc.URI = Desc.URI.substr(0,Desc.URI.size()-2);
+
+      new pkgAcqIndex(Owner, RealURI, Desc.Description,Desc.ShortDesc,
+                     ExpectedHash, string("plain"));
+         descChanged = true;
+   }
+   if (descChanged) {
       Status = StatDone;
       Complete = false;
       Dequeue();
       return;
-   } 
-   
+   }
+
    // on decompression failure, remove bad versions in partial/
    if(Decompression && Erase) {
       string s = _config->FindDir("Dir::State::lists") + "partial/";
@@ -674,10 +685,7 @@ void pkgAcqIndex::Done(string Message,unsigned long Size,string Hash,
    {
       // The files timestamp matches
       if (StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
-      {
-        unlink(FileName.c_str());
         return;
-      }
       Decompression = true;
       Local = true;
       DestFile += ".decomp";
@@ -696,22 +704,22 @@ void pkgAcqIndex::Done(string Message,unsigned long Size,string Hash,
    
    // The files timestamp matches
    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
-   {
-      unlink(FileName.c_str());
       return;
-   }
 
    if (FileName == DestFile)
       Erase = true;
    else
       Local = true;
    
-   string compExt = Desc.URI.substr(Desc.URI.size()-3);
-   char *decompProg;
+   string compExt = flExtension(flNotDir(URI(Desc.URI).Path));
+   const char *decompProg;
    if(compExt == "bz2") 
       decompProg = "bzip2";
-   else if(compExt == ".gz") 
+   else if(compExt == "gz") 
       decompProg = "gzip";
+   // flExtensions returns the full name if no extension is found
+   else if(compExt == flNotDir(URI(Desc.URI).Path))
+      decompProg = "copy";
    else {
       _error->Error("Unsupported extension: %s", compExt.c_str());
       return;
@@ -776,16 +784,19 @@ pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire *Owner,
    Desc.Owner = this;
    Desc.ShortDesc = ShortDesc;
    Desc.URI = URI;
-   
       
    string Final = _config->FindDir("Dir::State::lists");
    Final += URItoFileName(RealURI);
    struct stat Buf;
    if (stat(Final.c_str(),&Buf) == 0)
    {
-      // File was already in place.  It needs to be re-verified
-      // because Release might have changed, so Move it into partial
-      Rename(Final,DestFile);
+      // File was already in place.  It needs to be re-downloaded/verified
+      // because Release might have changed, we do give it a differnt
+      // name than DestFile because otherwise the http method will
+      // send If-Range requests and there are too many broken servers
+      // out there that do not understand them
+      LastGoodSig = DestFile+".reverify";
+      Rename(Final,LastGoodSig);
    }
 
    QueueURI(Desc);
@@ -797,7 +808,7 @@ pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire *Owner,
 string pkgAcqMetaSig::Custom600Headers()
 {
    struct stat Buf;
-   if (stat(DestFile.c_str(),&Buf) != 0)
+   if (stat(LastGoodSig.c_str(),&Buf) != 0)
       return "\nIndex-File: true";
 
    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
@@ -827,6 +838,12 @@ void pkgAcqMetaSig::Done(string Message,unsigned long Size,string MD5,
 
    Complete = true;
 
+   // put the last known good file back on i-m-s hit (it will
+   // be re-verified again)
+   // Else do nothing, we have the new file in DestFile then
+   if(StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
+      Rename(LastGoodSig, DestFile);
+
    // queue a pkgAcqMetaIndex to be verified against the sig we just retrieved
    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
                       DestFile, IndexTargets, MetaIndexParser);
@@ -843,7 +860,7 @@ void pkgAcqMetaSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
       Item::Failed(Message,Cnf);
       // move the sigfile back on transient network failures 
       if(FileExists(DestFile))
-        Rename(DestFile,Final);
+        Rename(LastGoodSig,Final);
 
       // set the status back to , Item::Failed likes to reset it
       Status = pkgAcquire::Item::StatTransientNetworkError;