1 #!/usr/bin/env ruby

     2 #

     3 # A 'smarter' jexec in ruby.

     4 #

     5 # Run a command in multiple jails in parallel.

     6 # Jails can be selected via host, ip, or jid.

     7 #

     8 #   "Run 'ls' in all jails that match the hostname 'trac':

     9 #       ./jexec2.rb trac ls

    10 #

    11 

    12 BEGIN {

    13         require 'pathname'

    14         basedir = Pathname.new( __FILE__ ).dirname.parent

    15 

    16         $LOAD_PATH.unshift basedir + "ext" unless 

    17                 $LOAD_PATH.include? basedir + "ext"

    18 }

    19 

    20 require 'jail'

    21 

    22 jarg = ARGV.shift

    23 args = ARGV

    24 

    25 jails = BSD::Jail.find_all do |j|

    26     j.jid     == jarg.to_i ||

    27     j.ip.to_s == jarg      ||

    28     j.host    =~ /#{jarg}/

    29 end or raise "Unable to find jails that match '#{jarg}'."

    30 

    31 

    32 jails.each do |j|

    33     $deferr.puts "Parent #{Process.pid} about to attach to #{j.host} in a block!"

    34     childpid = j.attach do

    35         $deferr.puts "Child #{Process.pid} exec()ing:", "  " + args.join(" ")

    36         exec( *args )

    37     end

    38 

    39     $deferr.puts "Parent: waiting on imprisoned child #{childpid}"

    40     Process.waitpid( childpid )

    41     $deferr.puts "Child exited with exit code: %d" % [ $?.exitstatus ]

    42 end

    43