Created
March 8, 2014 05:57
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testing command execution ideas
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require 'open3' | |
require 'pp' | |
require 'eventr' | |
require 'stringio' | |
$eventr = Eventr::Coordinator.instance | |
$eventr.publishers(:stderr, :stdout) | |
$eventr.consumer(:stderr) { |msg| $stderr.puts "STDERR: #{msg}" } | |
$eventr.consumer(:stdout) { |msg| $stdout.puts "STDOUT: #{msg}" } | |
$eventr.start | |
ENV_WHITELIST = %w( PATH HOME LDFLAGS CPPFLAGS DISPLAY EDITOR LANG LC_ALL SHELL SHLVL TERM TMPDIR USER ) | |
def prep_env(env = nil) | |
env ||= Hash[ENV] | |
Hash[env].inject([]) { |array,(k,v)| | |
array << "#{k}=#{v}" if ENV_WHITELIST.include? k | |
array | |
} | |
end | |
def command(*args) | |
env_arr = prep_env(Hash[ENV]) | |
cmd = args.join(' ') | |
puts "Command: #{cmd}" | |
result = Open3.popen3('/usr/bin/env', '-i', *env_arr, 'bash', '-c', cmd) do |i, out, err, thr| | |
o = Thread.new do | |
output = StringIO.new | |
loop { | |
begin | |
output << _o = out.readpartial(4096) | |
$eventr.publish(:stdout, _o) | |
rescue EOFError | |
break | |
end | |
} | |
output.rewind | |
output.read | |
end | |
e = Thread.new do | |
error = StringIO.new | |
loop { | |
begin | |
error << _e = err.readpartial(4096) | |
$eventr.publish(:stderr, _e) | |
rescue EOFError | |
break; | |
end | |
} | |
error.rewind | |
error.read | |
end | |
sleep 1 while thr.alive? | |
[ o.value, e.value, thr.value ] | |
end | |
end | |
pp command('sleep 3; echo foo; sleep 2; echo 2; sleep 1; echo bar') |
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