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#
# Author:: Adam Jacob (<adam@hjksolutions.com>)
# Copyright:: Copyright (c) 2008 HJK Solutions, LLC
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'tmpdir'
require 'fcntl'
require 'etc'
class Chef
module Mixin
module Command
def run_command(args={})
if args.has_key?(:creates)
if File.exists?(args[:creates])
Chef::Log.debug("Skipping #{args[:command_string]} - creates #{args[:creates]} exists.")
return false
end
end
if args.has_key?(:onlyif)
status = popen4(args[:onlyif]) { |p, i, o, e| }
if status.exitstatus != 0
Chef::Log.debug("Skipping #{args[:command_string]} - onlyif #{args[:onlyif]} returned #{status.exitstatus}")
return false
end
end
if args.has_key?(:unless)
status = popen4(args[:unless]) { |p, i, o, e| }
if status.exitstatus == 0
Chef::Log.debug("Skipping #{args[:command_string]} - unless #{args[:unless]} returned #{status.exitstatus}")
return false
end
end
exec_processing_block = lambda do |pid, stdin, stdout, stderr|
stdin.close
stdout_string = stdout.gets(nil)
if stdout_string
Chef::Log.debug("---- Begin #{args[:command_string]} STDOUT ----")
Chef::Log.debug(stdout_string.strip)
Chef::Log.debug("---- End #{args[:command_string]} STDOUT ----")
end
stderr_string = stderr.gets(nil)
if stderr_string
Chef::Log.debug("---- Begin #{args[:command_string]} STDERR ----")
Chef::Log.debug(stderr_string.strip)
Chef::Log.debug("---- End #{args[:command_string]} STDERR ----")
end
end
args[:cwd] ||= Dir.tmpdir
unless File.directory?(args[:cwd])
raise Chef::Exception::Exec, "#{args[:cwd]} does not exist or is not a directory"
end
status = nil
Dir.chdir(args[:cwd]) do
if args[:timeout]
begin
Timeout.timeout(args[:timeout]) do
status = popen4(args[:command], args, &exec_processing_block)
end
rescue Exception => e
Chef::Log.error("#{args[:command_string]} exceeded timeout #{args[:timeout]}")
raise(e)
end
else
status = popen4(args[:command], args, &exec_processing_block)
end
args[:returns] ||= 0
if status.exitstatus != args[:returns]
raise Chef::Exception::Exec, "#{args[:command_string]} returned #{status.exitstatus}, expected #{args[:returns]}"
else
Chef::Log.debug("Ran #{args[:command_string]} (#{args[:command]}) returned #{status.exitstatus}")
end
end
status
end
module_function :run_command
# This is taken directly from Ara T Howard's Open4 library, and then
# modified to suit the needs of Chef. Any bugs here are most likely
# my own, and not Ara's.
#
# The original appears in external/open4.rb in it's unmodified form.
#
# Thanks, Ara.
def popen4(cmd, args={}, &b)
args[:user] ||= nil
unless args[:user].kind_of?(Integer)
args[:user] = Etc.getpwnam(args[:user]).uid if args[:user]
end
args[:group] ||= nil
unless args[:group].kind_of?(Integer)
args[:group] = Etc.getgrnam(args[:group]).gid if args[:group]
end
args[:environment] ||= nil
pw, pr, pe, ps = IO.pipe, IO.pipe, IO.pipe, IO.pipe
verbose = $VERBOSE
begin
$VERBOSE = nil
ps.last.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
cid = fork {
pw.last.close
STDIN.reopen pw.first
pw.first.close
pr.first.close
STDOUT.reopen pr.last
pr.last.close
pe.first.close
STDERR.reopen pe.last
pe.last.close
STDOUT.sync = STDERR.sync = true
if args[:user]
Process.euid = args[:user]
Process.uid = args[:user]
end
if args[:group]
Process.egid = args[:group]
Process.gid = args[:group]
end
if args[:environment]
args[:environment].each do |key,value|
ENV[key] = value
end
end
begin
if cmd.kind_of?(Array)
exec(*cmd)
else
exec(cmd)
end
raise 'forty-two'
rescue Exception => e
Marshal.dump(e, ps.last)
ps.last.flush
end
ps.last.close unless (ps.last.closed?)
exit!
}
ensure
$VERBOSE = verbose
end
[pw.first, pr.last, pe.last, ps.last].each{|fd| fd.close}
begin
e = Marshal.load ps.first
raise(Exception === e ? e : "unknown failure!")
rescue EOFError # If we get an EOF error, then the exec was successful
42
ensure
ps.first.close
end
pw.last.sync = true
pi = [pw.last, pr.first, pe.first]
if b
begin
b[cid, *pi]
Process.waitpid2(cid).last
ensure
pi.each{|fd| fd.close unless fd.closed?}
end
else
[cid, pw.last, pr.first, pe.first]
end
end
module_function :popen4
end
end
end
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