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, 2 insertions, 0 deletions

diff --git a/methods/http.cc b/methods/http.cc
index c00b439b7..a5de13511 100644
--- a/methods/http.cc
+++ b/methods/http.cc
@@ -770,6 +770,8 @@ bool HttpMethod::Configuration(string Message)
    if (ServerMethod::Configuration(Message) == false)
       return false;
 
+   DropPrivsOrDie();
+
    AllowRedirect = _config->FindB("Acquire::http::AllowRedirect",true);
    PipelineDepth = _config->FindI("Acquire::http::Pipeline-Depth",
 				  PipelineDepth);