Fix backward compatiblity of the new pkgAcquireMethod::DropPrivsOrDie()

Do not drop privileges in the methods when using a older version of
libapt that does not support the chown magic in partial/ yet. To
do this DropPrivileges() now will ignore a empty Apt::Sandbox::User.

Cleanup all hardcoded _apt along the way.

1 files changed, 10 insertions, 2 deletions

diff --git a/methods/gzip.cc b/methods/gzip.cc
index 7ffcda60f..387c05f2e 100644
--- a/methods/gzip.cc
+++ b/methods/gzip.cc
@@ -33,12 +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			/*{{{*/
 // ---------------------------------------------------------------------
@@ -140,7 +150,5 @@ int main(int, char *argv[])
 
    GzipMethod Mth;
 
-   Mth.DropPrivsOrDie();
-
    return Mth.Run();
 }