added doc/apt.conf.sample

Unfortunately apt configuration is not straightforward at all regarding being overridden: one can't just provide sources.list but needs a corresponding apt.conf along with it, and that apt.conf must disable the SysV-style snippet directories to avoid interesting side effects of all the things getting overlaid. So it's not surprising that torabora has asked for an example... (thanks go to boyarsh@ since I asked him for an example long ago)

added doc/apt.conf.sample
08de7149 · Michael Shigorin · 895fae7d · 08de7149 · 08de7149
Commit 08de7149 authored Oct 31, 2011 by Michael Shigorin
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apt.conf.sample doc/apt.conf.sample +8 -0

variables.txt doc/variables.txt +1 -1

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--- a/doc/apt.conf.sample
+++ b/doc/apt.conf.sample
+// these must be unset to avoid picking up
+// /etc/apt/{apt.conf.d,sources.list.d,}/
+Dir::Etc::main "/dev/null";
+Dir::Etc::parts "/var/empty";
+Dir::Etc::SourceParts "/var/empty";
+
+// this is what caused the whole trouble
+Dir::Etc::sourcelist "/home/mike/apt/sources.list";
--- a/doc/variables.txt
+++ b/doc/variables.txt
@@ -6,7 +6,7 @@
 - APTCONF
  + задаёт путь к требуемому apt.conf
  + значение: пусто (по умолчанию системный) либо строка
-  + см. ../image.in/Makefile
+  + см. ../image.in/Makefile, apt.conf.sample

 - ARCH
  + определяет целевую архитектуру образа