Drop Privileges to "Debian-apt" in most acquire methods

Add a new "Debian-apt" user that owns the /var/lib/apt/lists
and /var/cache/apt/archive directories. The methods
http, https, ftp, gpgv, gzip switch to this user when they
start.

Thanks to Julian and "ioerror" and tors "switch_id()" code.

1 files changed, 2 insertions, 0 deletions

diff --git a/methods/copy.cc b/methods/copy.cc
index b78053d36..18d70e153 100644
--- a/methods/copy.cc
+++ b/methods/copy.cc
@@ -118,6 +118,8 @@ int main()
 {
    setlocale(LC_ALL, "");
 
+   DropPrivs();
+
    CopyMethod Mth;
    return Mth.Run();
 }