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WIP: refactoring of https://wiki.debian.org/AptConf and other apt configuration pages

Apt is configured by several resources, including:

• ?AptKeys

• preferences

• AptSources

• apt.conf.d

apt.conf.d

Apt accepts configuratino files (without extension) in /etc/apt/apt.conf.d/. These are processed by Apt in numeric/alphabetical order. /etc/apt/apt.conf is also valid but deprecated.

These files can contain various directives:

• Dpkg::Pre-Install-Pkgs {"mycommand";};: executes mycommand before package installation/unpacking by Dpkg.

• Dpkg::Pre-Invoke {"mycommand";};: executes mycommand before apt calls dpkg

• Dpkg::Post-Invoke {"mycommand";};: executes mycommand after apt calls dpkg

• Pre-Install-Pkgs: ??? TODO package filename in /var/cache/apt/archives/ is passed as stdin

• APT::Default-Release "testing";: sets the default Debian release used by Apt (TODO use case?)

• APT::Cache-Limit 10000000;: ??? TODO

}}}: ??? TODO

• Acquire::http::Proxy "http://proxy:8080";: sets the proxy for HTTP downloads

• Acquire::https::Proxy "https://proxy:8443";: sets the proxy for HTTPS downloads

If you really have to use FTP, this sets the FTP proxy:

 Acquire::ftp
 {
   Proxy "ftp://proxy:2121/";
   ProxyLogin
   {
      "USER $(SITE_USER)@$(SITE)";
      "PASS $(SITE_PASS)";
   }
 }