gzip method

Author: jgg
Date: 1998-10-25 07:07:29 GMT
gzip method

1 files changed, 179 insertions, 0 deletions

diff --git a/methods/gzip.cc b/methods/gzip.cc
new file mode 100644
index 000000000..15bff4d83
--- /dev/null
+++ b/methods/gzip.cc
@@ -0,0 +1,179 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+// $Id: gzip.cc,v 1.1 1998/10/25 07:07:30 jgg Exp $
+/* ######################################################################
+
+   GZip method - Take a file URI in and decompress it into the target 
+   file.
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/acquire-worker.h>
+#include <strutl.h>
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <utime.h>
+#include <wait.h>
+#include <stdio.h>
+									/*}}}*/
+
+// Fail - Generate a failure message					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void Fail(string URI)
+{
+   string Err = "Undetermined Error";
+   if (_error->empty() == false)
+      _error->PopMessage(Err);
+   
+   printf("400 URI Failure\n"
+	  "URI: %s\n"
+	  "Message: %s\n\n",URI.c_str(),Err.c_str());
+   _error->Discard();
+}
+									/*}}}*/
+
+int main()
+{
+   setlinebuf(stdout);
+   SetNonBlock(STDIN_FILENO,true);
+   
+   printf("100 Capabilities\n"
+	  "Version: 1.0\n"
+	  "Pipeline: true\n"
+	  "Send-Config: true\n\n");
+
+   vector<string> Messages;   
+   while (1)
+   {
+      if (WaitFd(STDIN_FILENO) == false ||
+	  ReadMessages(STDIN_FILENO,Messages) == false)
+	 return 0;
+
+      while (Messages.empty() == false)
+      {
+	 string Message = Messages.front();
+	 Messages.erase(Messages.begin());
+	 
+	 // Fetch the message number
+	 char *End;
+	 int Number = strtol(Message.c_str(),&End,10);
+	 if (End == Message.c_str())
+	 {
+	    cerr << "Malformed message!" << endl;
+	    return 100;
+	 }
+	 
+	 // 601 configuration message
+	 if (Number == 601)
+	 {
+	    pkgInjectConfiguration(Message,*_config);
+	    continue;
+	 }	 
+
+	 // 600 URI Fetch message
+	 if (Number != 600)
+	    continue;
+	 
+	 // Grab the URI bit 
+	 string URI = LookupTag(Message,"URI");
+	 string Target = LookupTag(Message,"Filename");
+	 
+	 // Grab the filename
+	 string::size_type Pos = URI.find(':');
+	 if (Pos == string::npos)
+	 {
+	    _error->Error("Invalid message");
+	    Fail(URI);
+	    continue;
+	 }
+	 string File = string(URI,Pos+1);
+	 
+	 // Start the reply message
+	 string Result = "201 URI Done";
+	 Result += "\nURI: " + URI;
+	 Result += "\nFileName: " + Target;
+	 
+	 // See if the file exists
+	 FileFd From(File,FileFd::ReadOnly);
+	 FileFd To(Target,FileFd::WriteEmpty);
+	 To.EraseOnFailure();
+	 if (_error->PendingError() == true)
+	 {
+	    Fail(URI);
+	    continue;
+	 }	 
+	 
+	 // Fork gzip
+	 int Process = fork();
+	 if (Process < 0)
+	 {
+	    _error->Errno("fork","Couldn't fork gzip");
+	    Fail(URI);
+	    continue;
+	 }
+	 
+	 // The child
+	 if (Process == 0)
+	 {
+	    dup2(From.Fd(),STDIN_FILENO);
+	    dup2(To.Fd(),STDOUT_FILENO);
+	    
+	    const char *Args[3];
+	    Args[0] = _config->FindFile("Dir::bin::gzip","gzip").c_str();
+	    Args[1] = "-d";
+	    Args[2] = 0;
+	    execvp(Args[0],(char **)Args);
+	 }
+	 From.Close();
+	 To.Close();
+	 
+	 // Wait for gzip to finish
+	 int Status;
+	 if (waitpid(Process,&Status,0) != Process)
+	 {
+	    _error->Errno("wait","Waiting for gzip failed");
+	    Fail(URI);
+	    continue;
+	 }	 
+
+	 if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+	 {
+	    _error->Error("gzip failed, perhaps the disk is full or the directory permissions are wrong.");
+	    Fail(URI);
+	    continue;
+	 }	 
+	 
+	 // Transfer the modification times
+	 struct stat Buf;
+	 if (stat(File.c_str(),&Buf) != 0)
+	 {
+	    _error->Errno("stat","Failed to stat");
+	    Fail(URI);
+	    continue;
+	 }
+	 struct utimbuf TimeBuf;
+	 TimeBuf.actime = Buf.st_atime;
+	 TimeBuf.modtime = Buf.st_mtime;
+	 if (utime(Target.c_str(),&TimeBuf) != 0)
+	 {
+	    _error->Errno("utime","Failed to set modification time");
+	    Fail(URI);
+	    continue;
+	 }
+	 
+	 // Send the message
+	 Result += "\n\n";
+	 if (write(STDOUT_FILENO,Result.begin(),Result.length()) != 
+	     (signed)Result.length())
+	    return 100;
+      }      
+   }
+   
+   return 0;
+}