support running "--simulate" as user

[apt.git] / methods / gzip.cc

diff --git a/methods/gzip.cc b/methods/gzip.cc
index f58a7263dc958448afa41b4ebab885e45bf01236..f732c0b8600f227bd98e0fb088038aea4383e8c8 100644 (file)
--- a/methods/gzip.cc
+++ b/methods/gzip.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: gzip.cc,v 1.11 2001/03/06 03:11:22 jgg Exp $
+// $Id: gzip.cc,v 1.17.2.1 2004/01/16 18:58:50 mdz Exp $
 /* ######################################################################
 
    GZip method - Take a file URI in and decompress it into the target 
@@ -13,13 +13,18 @@
 #include <apt-pkg/error.h>
 #include <apt-pkg/acquire-method.h>
 #include <apt-pkg/strutl.h>
+#include <apt-pkg/hashes.h>
 
 #include <sys/stat.h>
 #include <unistd.h>
 #include <utime.h>
 #include <stdio.h>
+#include <errno.h>
+#include <apti18n.h>
                                                                        /*}}}*/
 
+const char *Prog;
+
 class GzipMethod : public pkgAcqMethod
 {
    virtual bool Fetch(FetchItem *Itm);
@@ -29,6 +34,7 @@ class GzipMethod : public pkgAcqMethod
    GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
 };
 
+
 // GzipMethod::Fetch - Decompress the passed URI                       /*{{{*/
 // ---------------------------------------------------------------------
 /* */
@@ -36,45 +42,89 @@ bool GzipMethod::Fetch(FetchItem *Itm)
 {
    URI Get = Itm->Uri;
    string Path = Get.Host + Get.Path; // To account for relative paths
-   string GzipPath = _config->Find("Dir::bin::gzip","gzip");
    
+   string GzPathOption = "Dir::bin::"+string(Prog);
+
    FetchResult Res;
    Res.Filename = Itm->DestFile;
    URIStart(Res);
    
-   // Open the source and destintation files
+   // Open the source and destination files
    FileFd From(Path,FileFd::ReadOnly);
-   FileFd To(Itm->DestFile,FileFd::WriteEmpty);   
-   To.EraseOnFailure();
-   if (_error->PendingError() == true)
-      return false;
-   
+
+   // if the file is empty, just rename it and return
+   if(From.Size() == 0) 
+   {
+      rename(Path.c_str(), Itm->DestFile.c_str());
+      return true;
+   }
+
+   int GzOut[2];   
+   if (pipe(GzOut) < 0)
+      return _error->Errno("pipe",_("Couldn't open pipe for %s"),Prog);
+
    // Fork gzip
-   int Process = fork();
-   if (Process < 0)
-      return _error->Errno("fork",string("Couldn't fork "+GzipPath).c_str());
-   
-   // The child
+   pid_t Process = ExecFork();
    if (Process == 0)
    {
+      close(GzOut[0]);
       dup2(From.Fd(),STDIN_FILENO);
-      dup2(To.Fd(),STDOUT_FILENO);
+      dup2(GzOut[1],STDOUT_FILENO);
       From.Close();
-      To.Close();
+      close(GzOut[1]);
       SetCloseExec(STDIN_FILENO,false);
       SetCloseExec(STDOUT_FILENO,false);
       
       const char *Args[3];
-      Args[0] = GzipPath.c_str();
+      string Tmp = _config->Find(GzPathOption,Prog);
+      Args[0] = Tmp.c_str();
       Args[1] = "-d";
       Args[2] = 0;
       execvp(Args[0],(char **)Args);
-      exit(100);
+      _exit(100);
    }
    From.Close();
+   close(GzOut[1]);
+   
+   FileFd FromGz(GzOut[0]);  // For autoclose   
+   FileFd To(Itm->DestFile,FileFd::WriteEmpty);   
+   To.EraseOnFailure();
+   if (_error->PendingError() == true)
+      return false;
+   
+   // Read data from gzip, 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;
+      
+      if (Count < 0)
+      {
+        _error->Errno("read", _("Read error from %s process"),Prog);
+        Failed = true;
+        break;
+      }
+      
+      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,GzipPath.c_str(),false) == false)
+   if (ExecWait(Process,_config->Find(GzPathOption,Prog).c_str(),false) == false)
    {
       To.OpFail();
       return false;
@@ -82,31 +132,42 @@ bool GzipMethod::Fetch(FetchItem *Itm)
        
    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");
+      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");
+      return _error->Errno("utime",_("Failed to set modification time"));
 
    if (stat(Itm->DestFile.c_str(),&Buf) != 0)
-      return _error->Errno("stat","Failed to stat");
+      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 main(int argc, char *argv[])
 {
+   setlocale(LC_ALL, "");
+
    GzipMethod Mth;
+
+   Prog = strrchr(argv[0],'/');
+   Prog++;
+   
    return Mth.Run();
 }