From: daz <dooby@...10.karoo.co.uk>
Date: 2004-07-10T22:02:29+09:00
Subject: Re: Ruby Snapshot Notifier


Ryan Phillips wrote:
>
> On Sat, 10 Jul 2004 04:58:49 +0900, Randy Lawrence wrote:
> > Has anyone already implemented a ruby script to check if a new ruby
> > snapshot is available?  Would be neat if it could do this without
> > downloading the snapshot.
> >
> > It seems the Ruby 1.8.1 snapshot is updated fairly frequently and the
> > download page doesn't indicate the date/time stamp (so we periodically
> > download, untar, ungzip and examine the timestamps manually).
>
> You could write a script that FTP's to the server and uses the list
> command to get the filestamp of the file and compare it to a filestamp
> locally.
>

If it would save some of Matz' valuable bandwith, it's worth doing.
All you need to do is run this, then find out why it didn't do
what I expected on your machine. :)

File.utime isn't universally available (according to PickAxe I).
That often means "Windows has no chance", but it works for me.


daz



#---------------------------------------------------------------
# <ftp_snap.rb> -DfB-  2004/07/10
# Download stable-snapshot only if updated

ftp_site = 'ftp.iij.ad.jp'  # ftp.ruby-lang.org mirror
fn_snap  = 'stable-snapshot.tar.gz'   #  1.8.x

################################################
# Download to site-ruby/stable-snapshot.tar.gz #
################################################
require 'rbconfig'
fn_snap_save = File.join(Config::CONFIG['sitedir'], fn_snap)
# fn_snap_save = 'some.other'

#---------------------------------------------------------------
$stdout.sync = true

# [Y,M,D,h,m] to Time
def pdt_to_time(pdt, now = Time.now)
  unless pdt[1,4].compact.size==4
    raise "#{pdt[1,4].inspect} ... expected [M, D, h, m]"
  end
  pdt[0] ||= now.year                # assume year
  pdt[0] -= 1 if pdt[1] > now.month  # last year ?
  Time.utc(*pdt[0,5])
end

require 'ParseDate'
require 'net/ftp'

ftp = Net::FTP.open(ftp_site)
END { ftp.close unless ftp.closed? }
ftp.login
##
ftp.chdir('/pub/lang/ruby')
fline = ftp.list(fn_snap)
if fline.empty?
  ftp.chdir('/pub/ruby')
  fline = ftp.list(fn_snap)
end
unless fline.size==1
  puts '+++', fline, '+++'
  raise "Multiple, or no files match \"#{fn_snap}\""
end
#               <----  Jan..Dec  ---->
fline[0] =~ /(\s[AFJMNOS][aceopu][b-y]\s.*)#{Regexp.quote(fn_snap)}\Z/
ft = pdt_to_time(ParseDate::parsedate($1))
ft_prev = File.exist?(fn_snap_save) ? File.mtime(fn_snap_save).utc : 0
if ft > ft_prev
  if ft_prev > 0
    puts "Replacing:      #{ft_prev}"
  else
    puts "No previous snapshot found (first run)"
  end
  puts "Getting latest (#{ft}) ..."
  ftp.getbinaryfile(fn_snap, fn_snap_save, 1024)
  File.utime(ft, ft, fn_snap_save)
else
  puts "Existing snapshot is current"
end