X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/74eb9ea2c4b00538e3358bb67bf19e74047d340d..cbb1005a0a2e026e4a7361b0ff86888af192ee85:/methods/gzip.cc

diff --git a/methods/gzip.cc b/methods/gzip.cc
index f732c0b86..387c05f2e 100644
--- a/methods/gzip.cc
+++ b/methods/gzip.cc
@@ -9,17 +9,22 @@
    ##################################################################### */
 									/*}}}*/
 // Include Files							/*{{{*/
-#include <apt-pkg/fileutl.h>
-#include <apt-pkg/error.h>
+#include <config.h>
+
+#include <apt-pkg/configuration.h>
 #include <apt-pkg/acquire-method.h>
-#include <apt-pkg/strutl.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
 #include <apt-pkg/hashes.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/aptconfiguration.h>
 
+#include <string.h>
 #include <sys/stat.h>
-#include <unistd.h>
-#include <utime.h>
-#include <stdio.h>
-#include <errno.h>
+#include <sys/time.h>
+#include <string>
+#include <vector>
+
 #include <apti18n.h>
 									/*}}}*/
 
@@ -28,12 +33,22 @@ const char *Prog;
 class GzipMethod : public pkgAcqMethod
 {
    virtual bool Fetch(FetchItem *Itm);
+   virtual bool Configuration(std::string Message);
    
    public:
    
    GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
 };
 
+bool GzipMethod::Configuration(std::string Message)
+{
+   if (pkgAcqMethod::Configuration(Message) == false)
+      return false;
+
+   DropPrivsOrDie();
+
+   return true;
+}
 
 // GzipMethod::Fetch - Decompress the passed URI			/*{{{*/
 // ---------------------------------------------------------------------
@@ -41,133 +56,99 @@ class GzipMethod : public pkgAcqMethod
 bool GzipMethod::Fetch(FetchItem *Itm)
 {
    URI Get = Itm->Uri;
-   string Path = Get.Host + Get.Path; // To account for relative paths
+   std::string Path = Get.Host + Get.Path; // To account for relative paths
    
-   string GzPathOption = "Dir::bin::"+string(Prog);
-
    FetchResult Res;
    Res.Filename = Itm->DestFile;
    URIStart(Res);
-   
-   // Open the source and destination files
-   FileFd From(Path,FileFd::ReadOnly);
 
-   // if the file is empty, just rename it and return
-   if(From.Size() == 0) 
+   std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
+   std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
+   for (; compressor != compressors.end(); ++compressor)
+      if (compressor->Name == Prog)
+	 break;
+   if (compressor == compressors.end())
+      return _error->Error("Extraction of file %s requires unknown compressor %s", Path.c_str(), Prog);
+
+   // Open the source and destination files
+   FileFd From, To;
+   if (_config->FindB("Method::Compress", false) == false)
    {
-      rename(Path.c_str(), Itm->DestFile.c_str());
-      return true;
+      From.Open(Path, FileFd::ReadOnly, *compressor);
+      if(From.FileSize() == 0)
+	 return _error->Error(_("Empty files can't be valid archives"));
+      To.Open(Itm->DestFile, FileFd::WriteAtomic);
    }
-
-   int GzOut[2];   
-   if (pipe(GzOut) < 0)
-      return _error->Errno("pipe",_("Couldn't open pipe for %s"),Prog);
-
-   // Fork gzip
-   pid_t Process = ExecFork();
-   if (Process == 0)
+   else
    {
-      close(GzOut[0]);
-      dup2(From.Fd(),STDIN_FILENO);
-      dup2(GzOut[1],STDOUT_FILENO);
-      From.Close();
-      close(GzOut[1]);
-      SetCloseExec(STDIN_FILENO,false);
-      SetCloseExec(STDOUT_FILENO,false);
-      
-      const char *Args[3];
-      string Tmp = _config->Find(GzPathOption,Prog);
-      Args[0] = Tmp.c_str();
-      Args[1] = "-d";
-      Args[2] = 0;
-      execvp(Args[0],(char **)Args);
-      _exit(100);
+      From.Open(Path, FileFd::ReadOnly);
+      To.Open(Itm->DestFile, FileFd::WriteOnly | FileFd::Create | FileFd::Empty, *compressor);
    }
-   From.Close();
-   close(GzOut[1]);
-   
-   FileFd FromGz(GzOut[0]);  // For autoclose   
-   FileFd To(Itm->DestFile,FileFd::WriteEmpty);   
    To.EraseOnFailure();
-   if (_error->PendingError() == true)
+
+   if (From.IsOpen() == false || From.Failed() == true ||
+	 To.IsOpen() == false || To.Failed() == true)
       return false;
-   
-   // Read data from gzip, generate checksums and write
+
+   // Read data from source, generate checksums and write
    Hashes Hash;
    bool Failed = false;
    while (1) 
    {
       unsigned char Buffer[4*1024];
-      unsigned long Count;
-      
-      Count = read(GzOut[0],Buffer,sizeof(Buffer));
-      if (Count < 0 && errno == EINTR)
-	 continue;
+      unsigned long long Count = 0;
       
-      if (Count < 0)
+      if (!From.Read(Buffer,sizeof(Buffer),&Count))
       {
-	 _error->Errno("read", _("Read error from %s process"),Prog);
-	 Failed = true;
-	 break;
+	 To.OpFail();
+	 return false;
       }
-      
       if (Count == 0)
 	 break;
-      
+
       Hash.Add(Buffer,Count);
       if (To.Write(Buffer,Count) == false)
       {
 	 Failed = true;
-	 FromGz.Close();
 	 break;
       }      
    }
    
-   // Wait for gzip to finish
-   if (ExecWait(Process,_config->Find(GzPathOption,Prog).c_str(),false) == false)
-   {
-      To.OpFail();
-      return false;
-   }  
-       
+   From.Close();
+   Res.Size = To.FileSize();
    To.Close();
-   
+
    if (Failed == true)
       return false;
-   
+
    // Transfer the modification times
    struct stat Buf;
    if (stat(Path.c_str(),&Buf) != 0)
       return _error->Errno("stat",_("Failed to stat"));
 
-   struct utimbuf TimeBuf;
-   TimeBuf.actime = Buf.st_atime;
-   TimeBuf.modtime = Buf.st_mtime;
-   if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
-      return _error->Errno("utime",_("Failed to set modification time"));
+   struct timeval times[2];
+   times[0].tv_sec = Buf.st_atime;
+   Res.LastModified = times[1].tv_sec = Buf.st_mtime;
+   times[0].tv_usec = times[1].tv_usec = 0;
+   if (utimes(Itm->DestFile.c_str(), times) != 0)
+      return _error->Errno("utimes",_("Failed to set modification time"));
 
-   if (stat(Itm->DestFile.c_str(),&Buf) != 0)
-      return _error->Errno("stat",_("Failed to stat"));
-   
    // Return a Done response
-   Res.LastModified = Buf.st_mtime;
-   Res.Size = Buf.st_size;
    Res.TakeHashes(Hash);
 
    URIDone(Res);
-   
    return true;
 }
 									/*}}}*/
 
-int main(int argc, char *argv[])
+int main(int, char *argv[])
 {
    setlocale(LC_ALL, "");
 
+   Prog = strrchr(argv[0],'/');
+   ++Prog;
+
    GzipMethod Mth;
 
-   Prog = strrchr(argv[0],'/');
-   Prog++;
-   
    return Mth.Run();
 }