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, 3 insertions, 0 deletions

diff --git a/methods/gpgv.cc b/methods/gpgv.cc
index ae521a2ed..159417883 100644
--- a/methods/gpgv.cc
+++ b/methods/gpgv.cc
@@ -5,6 +5,7 @@
 #include <apt-pkg/error.h>
 #include <apt-pkg/gpgv.h>
 #include <apt-pkg/strutl.h>
+#include <apt-pkg/fileutl.h>
 
 #include <ctype.h>
 #include <errno.h>
@@ -262,6 +263,8 @@ int main()
 {
    setlocale(LC_ALL, "");
    
+   DropPrivs();
+
    GPGVMethod Mth;
 
    return Mth.Run();