rae%alias@csri.toronto.edu (Reid Ellis) (03/27/90)
A problem and a program.
The problem -
I have a program that archives all of the source groups for me at
night [comp.sources.*] which uses an 'rc' file in the home
directory. The program is called 'narc' and the rc file is named
'.narcrc' and everytime I run narc, which is a perl script, I get
8k of NULs appended to the end of my '.narcrc' [which JUST SO
HAPPENS to be == BUFSIZ]..
The program -
To help people find my problem :) here is my news archival
program, written in Perl.
#!/bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #!/bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
# narc.pl
# This archive created: Mon Mar 26 15:46:44 1990
# By: Reid Ellis (Alias Research)
export PATH; PATH=/bin:$PATH
if test -f 'narc.pl'
then
echo shar: over-writing existing file "'narc.pl'"
fi
cat << \SHAR_EOF > 'narc.pl'
#!/usr/local/bin/perl
#
# $Source: /repousr/u/rae/src/TEXT/perl/RCS/narc.pl,v $
# $Revision: 2.0 $
# $Author: rae $
# $Date: 90/03/25 15:43:00 $
# narc -- News ARChiver
# to avoid the buffering problems
#
$| = 0;
# Check for a NARCRC environment variable and use it if
# it's there.
#
if($ENV{'NARCRC'})
{
$narcrc = $ENV{'NARCRC'};
# if NARCRC doesn't start with a '/', prepend
# $HOME to it
#
if($narcrc !~ /\/.*/)
{
$narcrc = $ENV{"HOME"} . "/" . $narcrc;
}
}
else
{
# Default NARCRC: "$HOME/.narcrc"
#
$narcrc = $ENV{'HOME'} . "/.narcrc";
}
# testing flag. Usually zero.
#
$verbose=0;
$standalone = "stand";
# get the name of the news server. Can be replaced with
# a hardcoded '$server=machine;' if you like
#
$server_file = "/usr/local/lib/news/server";
$server = `cat $server_file` || die "Can't open $server_file";
chop $server;
# Where to find nntp
#
$nntp = "/usr/local/bin/nntp $server";
# open narcrc for input. The format is:
#
# /full/path/to/archive/directory
# dirname newsgroup last-time-of-access
# dirname newsgroup last-time-of-access
# dirname newsgroup last-time-of-access
# ...
#
# 'dirname' is appended to the initial path. The special
# case dirname of 'default' will use the last element of
# the newsgroup name. For example,
# default comp.sources.unix 19900101 000000
# will use the dirname 'unix'
open(NARCRC, "<$narcrc");
$SIG{'INT'} = 'handler';
$SIG{'QUIT'} = 'handler';
# The first line of the narcrc is where to store everythign
#
$repo = <NARCRC>;
chop($repo);
print "Saving files in $repo\n" if $verbose;
# $narc_line[$narc_index] is where each new line of the narcrc is
# stored . This only gets written out after a successful 'narc'.
#
$narc_index = 1;
# for each line in the narcrc
# chop it into separate bits
# ask nntp for all new news for the group
# for each new news item
# read article into /tmp/narc$$
# scan for magic string 'Archive-name'
# get the subdir and part-name from this line
# if hit eof, then no magic string was found, do next news item
# create all leading directories if they're not there already
# move /tmp/narc$$ to full pathname of archived article
while($narc_entry = <NARCRC>)
{
chop($narc_entry);
# This is a software end-of-file because I am having trouble with
# garbage showing up at the ends of file. With shar files it's
# not such a big deal, since they usually have 'exit 0' at the end
# of them, but with the .narcrc, it might be accidentally parsed.
#
last if($narc_entry eq "EOF");
($real_dirname, $newsgroup, $lastdate, $lasttime) = split(' ', $narc_entry);
# check for degenerate empty case
#
last if $newsgroup eq "" || $lastdate eq "" || $lasttime eq "";
# if "default", set dirname to last element
# of the newsgroup name
#
if($real_dirname eq "default" && $newsgroup =~ /.*\.([^.]*)$/)
{
$dirname = $1;
}
else
{
$dirname = $real_dirname;
}
# tell the user what's going on
#
"$lastdate $lasttime" =~ /^(..)(..)(..) (..)(..)(..)$/ &&
printf("%s %s 19%s-%s-%s %s:%s\n",
$newsgroup, "[$dirname]", $1, $2, $3, $4, $5);
# open the stdout of the nntp command
#
open(MSGIDS, "$nntp newnews $newsgroup $lastdate $lasttime|")
|| die "Can't get message ID's for $newsgroup from $server";
# flag to see if we do anything
$we_did_something = 0;
# for each message ID..
#
while($msgid = <MSGIDS>)
{
# set the we_did_something flag so we know to update
# the narcrc
#
$we_did_something = 1;
# Zap the trailing newline on $msgid
#
chop($msgid);
print "\t$msgid\n" if $verbose;
# Get the article and store it in /tmp so we don't
# need to use multiple [slow] nntp's for the same article
#
system("$nntp article '$msgid' > /tmp/narc$$");
# Open the article and check for "Archive-name"
#
open(BODY, "</tmp/narc$$") || die "Can't read retrieved article $msgid in file /tmp/narc$$";
while(<BODY>)
{
if(/^Archive-name:/)
{
($foo, $arc_name) = split;
@tree = split('/', $arc_name);
# Put it in the '$standalone' dir if it's a single shar
unshift(tree, $standalone) if $#tree == 0;
print "\t", join('/', @tree), "\n";
last;
} #if Archive-name
} # while BODY
# if eof then "Archive-name" wasn't found
#
last if eof;
# close the file
#
close(<BODY>);
# Now build the full pathname of where the file is
# supposed to live
$fullpath = $repo . '/' . $dirname . '/' . join('/', @tree);
$name = pop(@tree);
$relpath = $dirname . '/' . join('/', @tree);
# make sure the dirs are there
#
&mkpath($repo . '/' . $dirname . '/' . join('/', @tree));
if(-f $fullpath)
{
# A copy of the file already exists, so name this one the
# same as the existing one, but with a number appended to
# it to delineate its version.
#
for($i=2; -f $fullpath . $i; $i++)
{ }
# tack the number onto the end of the file name
#
$fullpath .= $i;
}
# and finally, put it there
system("mv /tmp/narc$$ $fullpath");
} # while MSGIDS
close(<MSGIDS>);
# only update the timestamp if we did anything
#
$timestamp = $we_did_something ? &now() : "$lastdate $lasttime";
# Save the narcrc lines in memory in order so we can save them in
# their original order. Just using 'each' on %NARCRC currently
# inverts their order [as of Perl 3.0]
#
$narc_line[$narc_index++] = sprintf("%s\t%s\t%s", $real_dirname, $newsgroup, $timestamp);
} # while narc_entry
close(<NARCRC>);
# Save an updated narcrc
#
print "Saving $narcrc..";
open(NARCRC, ">$narcrc");
print NARCRC $repo, "\n";
for($i=1; $i < $narc_index; $i++)
{
print NARCRC $narc_line[$i], "\n";
}
# software EOF
print NARCRC "EOF\n";
close(<NARCRC>);
print "\n";
# Subroutine to return the current date and time in
# nntp format, which is "YYMMDD HHMMSS"
#
sub now
{
($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time());
$mon++;
sprintf("%02d%02d%02d %02d%02d%02d", $year,$mon,$mday,$hour,$min,$sec);
}
sub handler
{
local($sig) = @_;
print "\n\nCaught signal $sig -- exiting $ARGV[0]\n";
close(<ARTICLE>);
close(<BODY>);
close(<MSGIDS>);
close(<NARCRC>);
close(<SAVEFILE>);
exit 0;
}
sub mkpath
{
local($fullpath) = @_;
local(@tree) = split('/', $fullpath);
local(@tmp) = ();
if($tree[0] eq "")
{
push(@tmp, shift(@tree));
}
foreach $dir (@tree)
{
push(@tmp, $dir);
$path = join('/', @tmp);
print "\t%% checking for '$path'\n" if $verbose;
mkdir("$path", 0777) || die "Can't create directory $path"
if ! -d "$path";
}
}
# Emacs cutsomisation
#
# Local Variables:
# mode:fundamental
# tab-width:4
# End:
SHAR_EOF
chmod +x 'narc.pl'
# End of shell archive
exit 0
Reid Ellis 264 Broadway Avenue, Toronto ON, M4P 1V9 Canada
rae@gpu.utcs.toronto.edu || rae%alias@csri.toronto.edu || +1 416 487 1383