calculate only expected hashes in methods

[apt.git] / methods / file.cc

diff --git a/methods/file.cc b/methods/file.cc
index 7ed4e6f60110bd1627d27f09c06952798dc07d54..043ab04b8286c68c03ad8290a5a1f0c918ba7eef 100644 (file)
--- a/methods/file.cc
+++ b/methods/file.cc
@@ -5,7 +5,7 @@
 
    File URI method for APT
    
-   This simply checks that the file specified exists, if so the relevent
+   This simply checks that the file specified exists, if so the relevant
    information is returned. If a .gz filename is specified then the file
    name with .gz removed will also be checked and information about it
    will be returned in Alt-*
@@ -16,13 +16,15 @@
 #include <config.h>
 
 #include <apt-pkg/acquire-method.h>
+#include <apt-pkg/aptconfiguration.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/hashes.h>
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/strutl.h>
 
+#include <string>
 #include <sys/stat.h>
-#include <unistd.h>
+
 #include <apti18n.h>
                                                                        /*}}}*/
 
@@ -32,7 +34,7 @@ class FileMethod : public pkgAcqMethod
    
    public:
    
-   FileMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly) {};
+   FileMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig | LocalOnly) {};
 };
 
 // FileMethod::Fetch - Fetch a file                                    /*{{{*/
@@ -57,31 +59,35 @@ bool FileMethod::Fetch(FetchItem *Itm)
       if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
         Res.IMSHit = true;
    }
-   
-   // See if we can compute a file without a .gz exentsion
-   std::string::size_type Pos = File.rfind(".gz");
-   if (Pos + 3 == File.length())
+
+   // See if the uncompressed file exists and reuse it
+   std::vector<std::string> extensions = APT::Configuration::getCompressorExtensions();
+   for (std::vector<std::string>::const_iterator ext = extensions.begin(); ext != extensions.end(); ++ext)
    {
-      File = std::string(File,0,Pos);
-      if (stat(File.c_str(),&Buf) == 0)
+      if (APT::String::Endswith(File, *ext) == true)
       {
-        FetchResult AltRes;
-        AltRes.Size = Buf.st_size;
-        AltRes.Filename = File;
-        AltRes.LastModified = Buf.st_mtime;
-        AltRes.IMSHit = false;
-        if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
-           AltRes.IMSHit = true;
-        
-        URIDone(Res,&AltRes);
-        return true;
-      }      
+        std::string const unfile = File.substr(0, File.length() - ext->length() - 1);
+        if (stat(unfile.c_str(),&Buf) == 0)
+        {
+           FetchResult AltRes;
+           AltRes.Size = Buf.st_size;
+           AltRes.Filename = unfile;
+           AltRes.LastModified = Buf.st_mtime;
+           AltRes.IMSHit = false;
+           if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
+              AltRes.IMSHit = true;
+
+           URIDone(Res,&AltRes);
+           return true;
+        }
+        // no break here as we could have situations similar to '.gz' vs '.tar.gz' here
+      }
    }
-   
+
    if (Res.Filename.empty() == true)
       return _error->Error(_("File not found"));
 
-   Hashes Hash;
+   Hashes Hash(Itm->ExpectedHashes);
    FileFd Fd(Res.Filename, FileFd::ReadOnly);
    Hash.AddFD(Fd);
    Res.TakeHashes(Hash);