ensure valid or remove destination file in file method

[apt.git] / methods / file.cc

diff --git a/methods/file.cc b/methods/file.cc
index 017222d84cef69dbb6df50e181d6a5bd5c8b6f95..5d5fffa67b289399165b53207a2575b98e263a37 100644 (file)
--- a/methods/file.cc
+++ b/methods/file.cc
@@ -1,9 +1,131 @@
-#include <stdio.h>
+// -*- mode: cpp; mode: fold -*-
+// Description                                                         /*{{{*/
+// $Id: file.cc,v 1.9.2.1 2004/01/16 18:58:50 mdz Exp $
+/* ######################################################################
+
+   File URI method for APT
+   
+   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-*
+   
+   ##################################################################### */
+                                                                       /*}}}*/
+// Include Files                                                       /*{{{*/
+#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 <apti18n.h>
+                                                                       /*}}}*/
+
+class FileMethod : public pkgAcqMethod
+{
+   virtual bool Fetch(FetchItem *Itm);
+   
+   public:
+   
+   FileMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig | LocalOnly) {};
+};
+
+// FileMethod::Fetch - Fetch a file                                    /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileMethod::Fetch(FetchItem *Itm)
+{
+   URI Get = Itm->Uri;
+   std::string File = Get.Path;
+   FetchResult Res;
+   if (Get.Host.empty() == false)
+      return _error->Error(_("Invalid URI, local URIS must not start with //"));
+
+   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.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;
+      Res.Filename = File;
+      Res.LastModified = Buf.st_mtime;
+      Res.IMSHit = false;
+      if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
+      {
+        unsigned long long const filesize = Itm->ExpectedHashes.FileSize();
+        if (filesize != 0 && filesize == Res.Size)
+           Res.IMSHit = true;
+      }
+   }
+
+   // 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)
+   {
+      if (APT::String::Endswith(File, *ext) == 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() == false)
+   {
+      Hashes Hash(Itm->ExpectedHashes);
+      FileFd Fd(Res.Filename, FileFd::ReadOnly);
+      Hash.AddFD(Fd);
+      Res.TakeHashes(Hash);
+   }
+
+   if (AltRes.Filename.empty() == false)
+      URIDone(Res,&AltRes);
+   else if (Res.Filename.empty() == false)
+      URIDone(Res);
+   else
+      return _error->Error(_("File not found"));
+
+   return true;
+}
+                                                                       /*}}}*/

 
 int main()
 {
 
 int main()
 {

-   printf("100 Capabilities\n"
-         "Version: 1.0\n"
-         "Pre-Scan: true\n\n"
-         "Version: 1.0\n\n");
+   setlocale(LC_ALL, "");
+
+   FileMethod Mth;
+   return Mth.Run();

 }
 }