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SOURCES.LIST(5) 			       APT				  SOURCES.LIST(5)

NAME
       sources.list - Package resource list for APT

DESCRIPTION
       The package resource list is used to locate archives of the package distribution system in
       use on the system. At this time, this manual page documents only the packaging system used
       by the Debian GNU/Linux system. This control file is /etc/apt/sources.list.

       The source list is designed to support any number of active sources and a variety of
       source media. The file lists one source per line, with the most preferred source listed
       first. The format of each line is: type uri args The first item, type determines the
       format for args.  uri is a Universal Resource Identifier (URI), which is a superset of the
       more specific and well-known Universal Resource Locator, or URL. The rest of the line can
       be marked as a comment by using a #.

SOURCES.LIST.D
       The /etc/apt/sources.list.d directory provides a way to add sources.list entries in
       separate files. The format is the same as for the regular sources.list file. File names
       need to end with .list and may only contain letters (a-z and A-Z), digits (0-9),
       underscore (_), hyphen (-) and period (.) characters. Otherwise APT will print a notice
       that it has ignored a file if the file doesn't match a pattern in the
       Dir::Ignore-Files-Silently configuration list - in this case it will be silently ignored.

THE DEB AND DEB-SRC TYPES
       The deb type describes a typical two-level Debian archive, distribution/component.
       Typically, distribution is generally an archivename like stable or testing or a codename
       like squeeze or wheezy while component is one of main contrib or non-free. The deb-src
       type describes a debian distribution's source code in the same form as the deb type. A
       deb-src line is required to fetch source indexes.

       The format for a sources.list entry using the deb and deb-src types is:

	   deb [ options ] uri distribution [component1] [component2] [...]

       The URI for the deb type must specify the base of the Debian distribution, from which APT
       will find the information it needs.  distribution can specify an exact path, in which case
       the components must be omitted and distribution must end with a slash (/). This is useful
       for when the case only a particular sub-section of the archive denoted by the URI is of
       interest. If distribution does not specify an exact path, at least one component must be
       present.

       distribution may also contain a variable, $(ARCH) which expands to the Debian architecture
       (i386, m68k, powerpc, ...) used on the system. This permits architecture-independent
       sources.list files to be used. In general this is only of interest when specifying an
       exact path, APT will automatically generate a URI with the current architecture otherwise.

       Since only one distribution can be specified per line it may be necessary to have multiple
       lines for the same URI, if a subset of all available distributions or components at that
       location is desired. APT will sort the URI list after it has generated a complete set
       internally, and will collapse multiple references to the same Internet host, for instance,
       into a single connection, so that it does not inefficiently establish an FTP connection,
       close it, do something else, and then re-establish a connection to that same host. This
       feature is useful for accessing busy FTP sites with limits on the number of simultaneous
       anonymous users. APT also parallelizes connections to different hosts to more effectively
       deal with sites with low bandwidth.

       options is always optional and needs to be surounded by square brackets. It can consist of
       multiple settings in the form setting=value. Multiple settings are separated by spaces.
       The following settings are supported by APT, note through that unsupported settings will
       be ignored silently:

       o   arch=arch1,arch2,...  can be used to specify for which architectures packages
	   information should be downloaded. If this option is not set all architectures defined
	   by the APT::Architectures option will be downloaded.

       o   trusted=yes can be set to indicate that packages from this source are always
	   authenificated even if the Release file is not signed or the signature can't be
	   checked. This disables parts of apt-secure(8) and should therefore only be used in a
	   local and trusted context.  trusted=no is the opposite which handles even correctly
	   authenificated sources as not authenificated.

       It is important to list sources in order of preference, with the most preferred source
       listed first. Typically this will result in sorting by speed from fastest to slowest
       (CD-ROM followed by hosts on a local network, followed by distant Internet hosts, for
       example).

       Some examples:

	   deb http://ftp.debian.org/debian squeeze main contrib non-free
	   deb http://security.debian.org/ squeeze/updates main contrib non-free

URI SPECIFICATION
       The currently recognized URI types are cdrom, file, http, ftp, copy, ssh, rsh.

       file
	   The file scheme allows an arbitrary directory in the file system to be considered an
	   archive. This is useful for NFS mounts and local mirrors or archives.

       cdrom
	   The cdrom scheme allows APT to use a local CDROM drive with media swapping. Use the
	   apt-cdrom(8) program to create cdrom entries in the source list.

       http
	   The http scheme specifies an HTTP server for the archive. If an environment variable
	   http_proxy is set with the format http://server:port/, the proxy server specified in
	   http_proxy will be used. Users of authenticated HTTP/1.1 proxies may use a string of
	   the format http://user:pass@server:port/. Note that this is an insecure method of
	   authentication.

       ftp
	   The ftp scheme specifies an FTP server for the archive. APT's FTP behavior is highly
	   configurable; for more information see the apt.conf(5) manual page. Please note that a
	   ftp proxy can be specified by using the ftp_proxy environment variable. It is possible
	   to specify a http proxy (http proxy servers often understand ftp urls) using this
	   method and ONLY this method. ftp proxies using http specified in the configuration
	   file will be ignored.

       copy
	   The copy scheme is identical to the file scheme except that packages are copied into
	   the cache directory instead of used directly at their location. This is useful for
	   people using a zip disk to copy files around with APT.

       rsh, ssh
	   The rsh/ssh method invokes rsh/ssh to connect to a remote host as a given user and
	   access the files. It is a good idea to do prior arrangements with RSA keys or rhosts.
	   Access to files on the remote uses standard find and dd commands to perform the file
	   transfers from the remote.

       more recognizable URI types
	   APT can be extended with more methods shipped in other optional packages which should
	   follow the nameing scheme apt-transport-method. The APT team e.g. maintains also the
	   apt-transport-https package which provides access methods for https-URIs with features
	   similar to the http method, but other methods for using e.g. debtorrent are also
	   available, see apt-transport-debtorrent(1).

EXAMPLES
       Uses the archive stored locally (or NFS mounted) at /home/jason/debian for stable/main,
       stable/contrib, and stable/non-free.

	   deb file:/home/jason/debian stable main contrib non-free

       As above, except this uses the unstable (development) distribution.

	   deb file:/home/jason/debian unstable main contrib non-free

       Source line for the above

	   deb-src file:/home/jason/debian unstable main contrib non-free

       The first line gets package information for the architectures in APT::Architectures while
       the second always retrieves amd64 and armel.

	   deb http://ftp.debian.org/debian squeeze main
	   deb [ arch=amd64,armel ] http://ftp.debian.org/debian squeeze main

       Uses HTTP to access the archive at archive.debian.org, and uses only the hamm/main area.

	   deb http://archive.debian.org/debian-archive hamm main

       Uses FTP to access the archive at ftp.debian.org, under the debian directory, and uses
       only the squeeze/contrib area.

	   deb ftp://ftp.debian.org/debian squeeze contrib

       Uses FTP to access the archive at ftp.debian.org, under the debian directory, and uses
       only the unstable/contrib area. If this line appears as well as the one in the previous
       example in sources.list a single FTP session will be used for both resource lines.

	   deb ftp://ftp.debian.org/debian unstable contrib

       Uses HTTP to access the archive at ftp.tlh.debian.org, under the universe directory, and
       uses only files found under unstable/binary-i386 on i386 machines, unstable/binary-amd64
       on amd64, and so forth for other supported architectures. [Note this example only
       illustrates how to use the substitution variable; official debian archives are not
       structured like this]

	   deb http://ftp.tlh.debian.org/universe unstable/binary-$(ARCH)/

SEE ALSO
       apt-cache(8) apt.conf(5)

BUGS
       APT bug page[1]. If you wish to report a bug in APT, please see
       /usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.

AUTHORS
       Jason Gunthorpe

       APT team

NOTES
	1. APT bug page
	   http://bugs.debian.org/src:apt

Linux					 29 February 2004			  SOURCES.LIST(5)
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