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fetchnews(8)		    System Manager's Manual		  fetchnews(8)

NAME
       fetchnews - fetch news via NNTP

SYNOPSIS
       fetchnews [-q] [-v] ... [-x number] [-l]	[-n] [-f] [-P] [-w]

DESCRIPTION
       Leafnode	 is a USENET package intended for small	sites, where there are
       few users and little disk space,	but where a large number of groups  is
       desired.

       The  design  of leafnode	is intended to self-repair after problems, and
       to require no manual maintenance.

       Fetchnews (formerly called "fetch") is the program  which  submits  and
       retrieves new articles to or from the upstream NNTP server.

OPTIONS
       -q     Be quiet.	Suppresses some	warnings. This flag cancels any	previ-
	      ously encountered	-v flags.

       -v     Be verbose.  This	flag cancels  any  previously  encountered  -q
	      flags.   A  maximum of four -v can be used (the more v, the more
	      verbose):

       -v     Warn about non-critical errors.

       -vv    Be verbose whenever a group command occurs.

       -vvv   Be verbose whenever an article command occurs.

       -vvvv  For debugging purposes. Don't expect the	additional  output  to
	      make sense.

       -w     Wait  mode.  This	 causes	the XOVER update (which	runs after the
	      article fetch phase) to run in the foreground. By	 default,  the
	      XOVER update runs	in the background, detached from the shell, on
	      systems that offer a working fork(2) call. Helpful for debugging
	      and to avoid terminal clobbering when fetchnews is run manually.

       -x number
	      Go number	articles back and try to re-fetch what's missing. This
	      can be useful to pull data from broken servers that have	either
	      overview	and  group data	out of synch or	create articles	out of
	      article number order.

       -l     Don't use	supplementary servers (-l is  supposed	to  mean  "lo-
	      cal").  This does	speed up the operation quite a bit.

       -n     Do  not  expire newsgroup	subscriptions. Technically: do not un-
	      link files in the	interesting.groups directory.

       -f     Erase the	active.read file, thus force redownloading  the	 whole
	      active file from all upstream servers. This is usually occurring
	      only very	infrequently because it	takes a	long time.  See	 time-
	      out_active  in leafnode(8).  DO NOT use this option in cron jobs
	      or otherwise regularly.

       -P     Only post	articles that have accumulated in the out.going	direc-
	      tory but do not fetch articles from upstream servers.

EXIT STATUS
       fetchnews  will exit with code 0	if it could connect to all servers and
       encountered no other errors. It exits with code 2 when it was unable to
       connect	to  at least one server, and it	exits with code	1 on other er-
       rors.

FILES AND CONFIGURATION
       /var/spool/leafnode/leaf.node/active.read
	      is a file	to track when the active files have been  successfully
	      downloaded  from	the  upstream  servers the last	time. If it is
	      missing, this has	the same effect	as giving the -f option. It is
	      only  created after the active file of each upstream servers has
	      been downloaded successfully.

       See leafnode(8) for the list of other files affected, and for  informa-
       tion on configuring fetchnews.

ENVIRONMENT
       LN_SKIP_GROUPS=pattern[,pattern[...]] (since v1.9.53)
	      If  set,	all  groups  that match	one of the wildmat(3) patterns
	      will be skipped during the fetch.	This can be used  as  a	 quick
	      way  of skipping binary groups during daytime, for instance, ex-
	      ample:

	      env  'LN_SKIP_GROUPS=*binary*,alt.*'   /usr/local/sbin/fetchnews
	      -nq

       LN_LOCK_TIMEOUT
	      This  variable is	parsed as an unsigned integer value and	deter-
	      mines how	many seconds fetchnews will wait when trying to	obtain
	      the lock file from another leafnode program. 0 means to wait in-
	      definitely. This variable	takes precedence over  the  configura-
	      tion file.

       LN_SUPPRESS_DATE
	      (since  v1.11.7)	If this	variable is defined (regardless	of its
	      value, including empty), leafnode	will  skip  checking  the  up-
	      stream server's time by means of the NNTP	DATE command.

ALGORITHM
       Here is a brief description of what fetchnews does.

       First,  after connecting	to the upstream	NNTP server, all articles that
       have the	u+r permission (0400) flag set in  /var/spool/leafnode/out.go-
       ing  are	 posted	using POST.  If	a posting fails, that article is moved
       to /var/spool/leafnode/failed.postings which an	administrator  has  to
       clean  up  once	in  a  while.  Moving a	file back to /var/spool/leafn-
       ode/out.going is	sufficient to retry the	 post  it.  The	 u+r  flag  is
       checked	to prevent posting an (incomplete) article that	leafnode(8) is
       still receiving at the same time.  If a posting succeeds,  the  article
       is  removed  from out.going in order to not post	it twice into a	moder-
       ated newsgroup on a different server (which would send multiple	copies
       of the article to the moderator).  Note:	older fetchnews	versions tried
       to post on all servers first, but failed	to  do	so  when  one  of  the
       servers	could  not  be reached.	If you need to work around a dodgy up-
       stream server that is fast but doesn't  forward	your  posts  reliably,
       prohibit	 posting  to this server using the nopost server option	in the
       configuration file, see leafnode(8).

       Second, the upstream server's list of newsgroups	(obtained  using  LIST
       and  LIST  NEWSGROUPS) is merged	into leafnode's	(if timeout_active has
       expired,	the active.read	file is	not present  or	 the  active  file  is
       empty) or updated (with NEWGROUPS).

       Third,  fetchnews  iterates  over  the list of newsgroups, performing a
       GROUP, an XOVER (if supported) or XHDR Message-ID and a number of  HEAD
       and  BODY  or  ARTICLE  commands	for each group which has been read re-
       cently. It assumes that for the particular  group  it  is  looking  at,
       "maxage"	was set	to the groupexpire or global expire. As	a consequence,
       it makes	only sense to set maxage lower than or equal to	expire.

NOTES
       Fetchnews does not use NEWNEWS.	NEWNEWS	is not used because it is  of-
       ten very	expensive and therefore	also disabled at many sites.

       After  some  experiments, I decided that	it was better to fetch all the
       articles	in a group than	to optimize away some;	users  would  complain
       too loudly when the optmizer guessed wrongly.

       The  only  way to control what newsgroups are accessible	to local users
       is to control what the upstream server lets fetchnews  read,  and  that
       will  not keep out all crossposts (endemic in e.g. the alt.sex groups).
       If your site is big enough that you need	to control  newsgroup  access,
       consider	using a	news server which is designed for a big	site.

       Fetchnews  sets	its  real  and effective uid to	"news" when started as
       root and	refuses	to run if it cannot get	this user ID.

BUGS
       Fetchnews ignores the "Supersedes:" and "Control:" headers.

HISTORY
       Older versions of fetchnews posted any  articles	 found	in  out.going.
       Since  v1.9.23,	fetchnews will only post article files that have their
       user executable bit set.	 Leafnode sets this bit	after it has  success-
       fully  received	a post.	This behaviour avoids posting incomplete arti-
       cles when leafnode receives a post at the same time fetchnews is	 post-
       ing.

AUTHOR
       Written	 by   Arnt   Gulbrandsen   <agulbra@troll.no>	and  copyright
       1995\--\-96 Troll Tech AS, Postboks 6133	Etterstad, 0602	Oslo,  Norway,
       fax +47 22646949.

       Modified	 by  Cornelius	Krasel	<krasel@wpxx02.toxi.uni-wuerzburg.de>,
       Markus Enzenberger <enz@cip.physik.uni-muenchen.de> and Randolf	Skerka
       <Randolf.Skerka@gmx.de>.	 Copyright of the modifications	1997\--\-1999.
       Modified	by Matthias Andree <matthias.andree@gmx.de>, copyright of  the
       modifications 2001\--\-2004.

SEE ALSO
       leafnode(8),   texpire(8),   newsq(1),	/usr/local/etc/leafnode/leafn-
       ode/filters.example.

leafnode			    1.11.11			  fetchnews(8)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | FILES AND CONFIGURATION | ENVIRONMENT | ALGORITHM | NOTES | BUGS | HISTORY | AUTHOR | SEE ALSO

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