X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/8f3ba4e8708cb72be19dacc2af4f601ee5fea292..2861bd9a2687dbd744997fddcfe90475be525bf0:/methods/file.cc

diff --git a/methods/file.cc b/methods/file.cc
index d58652e6e..40e85bce5 100644
--- 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-*
@@ -16,22 +16,25 @@
 #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>
 									/*}}}*/
 
 class FileMethod : public pkgAcqMethod
 {
-   virtual bool Fetch(FetchItem *Itm);
+   virtual bool Fetch(FetchItem *Itm) APT_OVERRIDE;
    
    public:
    
-   FileMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly) {};
+   FileMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig | LocalOnly) {};
 };
 
 // FileMethod::Fetch - Fetch a file					/*{{{*/
@@ -45,8 +48,27 @@ bool FileMethod::Fetch(FetchItem *Itm)
    if (Get.Host.empty() == false)
       return _error->Error(_("Invalid URI, local URIS must not start with //"));
 
-   // See if the file exists
    struct stat Buf;
+   // deal with destination files which might linger around
+   if (lstat(Itm->DestFile.c_str(), &Buf) == 0)
+   {
+      if ((Buf.st_mode & S_IFREG) != 0)
+      {
+	 if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
+	 {
+	    HashStringList const hsl = Itm->ExpectedHashes;
+	    if (Itm->ExpectedHashes.VerifyFile(File))
+	    {
+	       Res.Filename = Itm->DestFile;
+	       Res.IMSHit = true;
+	    }
+	 }
+      }
+   }
+   if (Res.IMSHit != true)
+      unlink(Itm->DestFile.c_str());
+
+   // See if the file exists
    if (stat(File.c_str(),&Buf) == 0)
    {
       Res.Size = Buf.st_size;
@@ -54,37 +76,50 @@ bool FileMethod::Fetch(FetchItem *Itm)
       Res.LastModified = Buf.st_mtime;
       Res.IMSHit = false;
       if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
-	 Res.IMSHit = true;
+      {
+	 unsigned long long const filesize = Itm->ExpectedHashes.FileSize();
+	 if (filesize != 0 && filesize == Res.Size)
+	    Res.IMSHit = true;
+      }
+
+      Hashes Hash(Itm->ExpectedHashes);
+      FileFd Fd(File, FileFd::ReadOnly);
+      Hash.AddFD(Fd);
+      Res.TakeHashes(Hash);
    }
-   
-   // See if we can compute a file without a .gz exentsion
-   std::string::size_type Pos = File.rfind(".gz");
-   if (Pos + 3 == File.length())
+   if (Res.IMSHit == false)
+      URIStart(Res);
+
+   // See if the uncompressed file exists and reuse it
+   FetchResult AltRes;
+   AltRes.Filename.clear();
+   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)
+	 {
+	    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;
+	    break;
+	 }
+	 // no break here as we could have situations similar to '.gz' vs '.tar.gz' here
+      }
    }
-   
-   if (Res.Filename.empty() == true)
+
+   if (AltRes.Filename.empty() == false)
+      URIDone(Res,&AltRes);
+   else if (Res.Filename.empty() == false)
+      URIDone(Res);
+   else
       return _error->Error(_("File not found"));
 
-   Hashes Hash;
-   FileFd Fd(Res.Filename, FileFd::ReadOnly);
-   Hash.AddFD(Fd.Fd(), Fd.Size());
-   Res.TakeHashes(Hash);
-   URIDone(Res);
    return true;
 }
 									/*}}}*/