Fixed possible segv if there are no packages

[apt.git] / apt-pkg / init.cc

diff --git a/apt-pkg/init.cc b/apt-pkg/init.cc
index f8cf54ee46b5c874bc437dd83f734376f9b3f21a..3c702af9b7b6a12e41730383c53fc6be83fe3548 100644 (file)
--- a/apt-pkg/init.cc
+++ b/apt-pkg/init.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/

-// $Id: init.cc,v 1.4 1998/07/26 04:49:26 jgg Exp $
+// $Id: init.cc,v 1.17 2001/12/05 07:22:39 tausq Exp $

 /* ######################################################################
 
    Init - Initialize the package library
 /* ######################################################################
 
    Init - Initialize the package library


@@ -9,40 +9,124 @@
                                                                        /*}}}*/
 // Include files                                                       /*{{{*/
 #include <apt-pkg/init.h>
                                                                        /*}}}*/
 // Include files                                                       /*{{{*/
 #include <apt-pkg/init.h>

+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/error.h>
+
+#include <apti18n.h>
+#include <config.h>
+#include <sys/stat.h>

                                                                        /*}}}*/
 
                                                                        /*}}}*/
 

-// pkgInitialize - Initialize the configuration class                  /*{{{*/
+#define Stringfy_(x) # x
+#define Stringfy(x)  Stringfy_(x)
+const char *pkgVersion = VERSION;
+const char *pkgLibVersion = Stringfy(APT_PKG_MAJOR) "."
+                            Stringfy(APT_PKG_MINOR) "." 
+                            Stringfy(APT_PKG_RELEASE);
+const char *pkgCPU = COMMON_CPU;
+const char *pkgOS = COMMON_OS;
+    
+// pkgInitConfig - Initialize the configuration class                  /*{{{*/

 // ---------------------------------------------------------------------
 /* Directories are specified in such a way that the FindDir function will
    understand them. That is, if they don't start with a / then their parent
    is prepended, this allows a fair degree of flexability. */
 // ---------------------------------------------------------------------
 /* Directories are specified in such a way that the FindDir function will
    understand them. That is, if they don't start with a / then their parent
    is prepended, this allows a fair degree of flexability. */

-bool pkgInitialize(Configuration &Cnf)
+bool pkgInitConfig(Configuration &Cnf)

 {
    // General APT things
 {
    // General APT things

-   Cnf.Set("APT::Architecture","i386");
-
-   // State
-   Cnf.Set("Dir::State","/var/state/apt/");
-   Cnf.Set("Dir::State::lists","lists/");
+   if (strcmp(COMMON_OS,"linux") == 0 ||
+       strcmp(COMMON_OS,"unknown") == 0)
+      Cnf.Set("APT::Architecture",COMMON_CPU);
+   else
+      Cnf.Set("APT::Architecture",COMMON_OS "-" COMMON_CPU);
+   Cnf.Set("APT::Build-Essential::", "build-essential");
+   Cnf.Set("Dir","/");

    
    

-   /* These really should be jammed into a generic 'Local Database' engine
-      which is yet to be determined. The functions in pkgcachegen should
-      be the only users of these */
-   Cnf.Set("Dir::State::xstatus","xstatus");
-   Cnf.Set("Dir::State::userstatus","status.user");   
-   Cnf.Set("Dir::State::status","/var/lib/dpkg/status");
+   // State   
+   Cnf.Set("Dir::State","var/lib/apt/");
+   
+   /* Just in case something goes horribly wrong, we can fall back to the
+      old /var/state paths.. */
+   struct stat St;   
+   if (stat("/var/lib/apt/.",&St) != 0 &&
+       stat("/var/state/apt/.",&St) == 0)
+      Cnf.Set("Dir::State","var/state/apt/");
+       
+   Cnf.Set("Dir::State::lists","lists/");
+   Cnf.Set("Dir::State::cdroms","cdroms.list");

    
    // Cache
    
    // Cache

-   Cnf.Set("Dir::Cache","/tmp/");
+   Cnf.Set("Dir::Cache","var/cache/apt/");

    Cnf.Set("Dir::Cache::archives","archives/");
    Cnf.Set("Dir::Cache::archives","archives/");

-   Cnf.Set("Dir::Cache::srcpkgcache","srcpkgcache");
-   Cnf.Set("Dir::Cache::pkgcache","pkgcache");
+   Cnf.Set("Dir::Cache::srcpkgcache","srcpkgcache.bin");
+   Cnf.Set("Dir::Cache::pkgcache","pkgcache.bin");

    
    // Configuration
    
    // Configuration

-   Cnf.Set("Dir::Etc","/etc/apt/");
+   Cnf.Set("Dir::Etc","etc/apt/");

    Cnf.Set("Dir::Etc::sourcelist","sources.list");
    Cnf.Set("Dir::Etc::sourcelist","sources.list");

+   Cnf.Set("Dir::Etc::vendorlist","vendors.list");
+   Cnf.Set("Dir::Etc::vendorparts","vendors.list.d");

    Cnf.Set("Dir::Etc::main","apt.conf");
    Cnf.Set("Dir::Etc::main","apt.conf");

+   Cnf.Set("Dir::Etc::parts","apt.conf.d");
+   Cnf.Set("Dir::Etc::preferences","preferences");
+   Cnf.Set("Dir::Bin::methods","/usr/lib/apt/methods");
+             
+   bool Res = true;
+   
+   // Read an alternate config file
+   const char *Cfg = getenv("APT_CONFIG");
+   if (Cfg != 0 && FileExists(Cfg) == true)
+      Res &= ReadConfigFile(Cnf,Cfg);
+   
+   // Read the configuration parts dir
+   string Parts = Cnf.FindDir("Dir::Etc::parts");
+   if (FileExists(Parts) == true)
+      Res &= ReadConfigDir(Cnf,Parts);
+      
+   // Read the main config file
+   string FName = Cnf.FindFile("Dir::Etc::main");
+   if (FileExists(FName) == true)
+      Res &= ReadConfigFile(Cnf,FName);

    
    

+   if (Res == false)
+      return false;
+   
+   if (Cnf.FindB("Debug::pkgInitConfig",false) == true)
+      Cnf.Dump();
+      

    return true;
 }
                                                                        /*}}}*/
    return true;
 }
                                                                        /*}}}*/

+// pkgInitSystem - Initialize the _system calss                                /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgInitSystem(Configuration &Cnf,pkgSystem *&Sys)
+{
+   Sys = 0;
+   string Label = Cnf.Find("Apt::System","");
+   if (Label.empty() == false)
+   {
+      Sys = pkgSystem::GetSystem(Label.c_str());
+      if (Sys == 0)
+        return _error->Error(_("Packaging system '%s' is not supported"),Label.c_str());
+   }
+   else
+   {
+      signed MaxScore = 0;
+      for (unsigned I = 0; I != pkgSystem::GlobalListLen; I++)
+      {
+        signed Score = pkgSystem::GlobalList[I]->Score(Cnf);
+        if (Score > MaxScore)
+        {
+           MaxScore = Score;
+           Sys = pkgSystem::GlobalList[I];
+        }
+      }
+      
+      if (Sys == 0)
+        return _error->Error(_("Unable to determine a suitable system type"));
+   }
+   
+   return Sys->Initialize(Cnf);
+}
+                                                                       /*}}}*/