Provided by: apt_0.6.43.3ubuntu2_i386 bug


       sources.list - Package resource list for APT


       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 located in /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 #.


       The  /etc/apt/sources.list.d  directory   provides   a   way   to   add
       sources.list  entries in seperate files that end with .list. The format
       is the same as for the regular sources.list file.


       The  deb  type  describes   a   typical   two-level   Debian   archive,
       distribution/component.  Typically,  distribution  is  generally one of
       stable  unstable or testing while component is  one  of  main   contrib
       non-free  or  non-us 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

       deb 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 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

       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.

       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 stable main contrib non-free
       deb dists/stable-updates/


       The currently recognized URI types are cdrom, file, http, and ftp.

       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

       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. No password authentication
              is possible, prior arrangements with RSA  keys  or  rhosts  must
              have been made. Access to files on the remote uses standard find
              and dd commands to perform the file transfers from the remote.


       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

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

       deb hamm main

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

       deb stable contrib

       Uses  FTP  to  access  the  archive at, 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 unstable contrib

       Uses  HTTP  to  access  the  archive  at,  under  the
       debian-non-US directory.

       deb stable/non-US main contrib non-free

       Uses  HTTP  to  access  the  archive  at,  under  the
       debian-non-US   directory,   and   uses   only   files   found    under
       unstable/binary-i3866  on  i386 machines, unstable/binary-m68k on m68k,
       and so forth for other supported architectures. [Note this example only
       illustrates  how  to use the substitution variable; non-us is no longer
       structured like this]

       deb unstable/binary-$(ARCH)/


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


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


       Jason Gunthorpe, APT team.