Linux repositories inspector


Harold Tay
Aliases: snstore(8)


Small NNTP server for leaf sites


snsend - distribute articles
snstore - store articles locally


snsend [-rvcna]
snstore [-rvcna]


snsend reads articles from descriptor 0 and distributes each one into each newsgroup they are posted to, like inews. snstore does the same but stores them all locally. The input articles are expected to be in wire format (lines end with CRLF, leading dots are doubled, and articles are terminated with a lone dot).
Control messages are not treated specially.
The newsgroups list is taken from the X-sn-Newsgroups field if it exists; otherwise it is taken from the Newsgroups field, which must exist or the article will be junked. All fields whose names begin with X-sn- (case insensitive) are always removed.
If Date or Message-ID are not present, these are created. The local hosts name is prepended to the Path field.
If an article is to be junked, it is sent to the junk newsgroup if it exists, otherwise it is discarded.


This applies only to snsend. snstore does not route; it treats all news.groups as though they were local (see Nonexistent newsgroup and Local newsgroup below). If any of the following fails, snsend aborts:
For each an article is (cross-) posted to, snsend routes the article as follows, aborting if any action fails:
Nonexistent newsgroup
If /var/spool/sn/ is not a directory, snsend ignores this If all news.groups are thus ignored, the article is junked.
Global newsgroup
If /var/spool/sn/ is a (symlink to a) directory, snsend stores the article into a file in that directory, if the same article does not already exist there (so’s upstream feed doesn’t get multiple copies of the same article.) Such in-transit article files are given names that begin with a $ sign.
Local processing via script
Otherwise if /var/spool/sn/ is a regular file, it is taken to be a script or program and is run with the article available on its input. See /var/spool/sn/dot-outgoing.ex.
Local processing via fifo
Otherwise if /var/spool/sn/ is a fifo, the article is written into it. It is an error if nothing is reading the fifo.
Local newsgroup
Otherwise if /var/spool/sn/ does not exist, the article is stored into


Options apply to snsend and snstore equally.
-r The article stream is in rnews batch format, rather than wire format. Only the #! rnews form is understood.
-c If an article already exists in the local newsgroup it is destined for, don’t store it there. For snsend, this option has no effect on newsgroups that are not local.
-a (Aliases not allowed.) When storing to multiple local newsgroups, do not alias subsequent copies to the first, instead, make a copy. Aliasing saves disk space, but when the original expires, so do all aliases to it. This option has no effect on newsgroups that are not local.
-n Don’t actually do anything with the article, just dump it back onto descriptor 1.
-v For each article stored in each newsgroup, output a line to descriptor 1 similar to what snscan would emit, except that for non-local newsgroups the serial number will always be 0.


This includes /var/spool/sn/=junk newsgroup if it exists. Each such directory represents the newsgroup of the same name, and articles are stored in files 1, 2, 3, etc. beneath it. Each such file contains 1 or more articles. This is contrary to the traditional form of /var/spool/sn/news/group/name.
See also ROUTING above. The presence of this directory indicates that is global, and articles posted to end up here in files named $*. These files are linked in already complete, so all such files are ready to be uploaded.
If this file exists, articles stored in are candidates for compression. The content of the file is a number representing a minimum article body size below which compression won’t be applied. If the file is empty this threshold defaults to 1024 bytes.
If this file exists, it’s contents are taken to be the local hosts name for purposes of the Path field. Otherwise the name is obtained from gethostname(2).


See also /usr/sbin/dot-outgoing.ex for other variables exported when snsend invokes a .outgoing program.
SNROOT If this is set, its value is used in place of /var/spool/sn.


snsend and snstore exit 0 on success, 1 on usage error, 2 on system error, 3 on article format error, and 9 if /var/spool/sn/ (snsend only) exits with other than 0.


/usr/sbin/dot-outgoing.ex, snscan(1)


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