Error 127, not related to Puppet or Golang

Written by

Sorin Tudor

in

,

Hi,

Something from my experience playing with Golang and Puppet code this morning.
I wrote a very very simple script to restart a service that you can find here
Today i wanted to put it on the machine and run it with puppet, so i wrote a very small class that looked like this:

class profiles_test::updatekafka {

package { 'golang':
  ensure => installed,
  name   => 'golang',
}
file {"/root/servicerestart.go":
    source => 'puppet:///modules/profiles_test/servicerestart.go',
    mode => '0644',
    replace => true,
	}
exec { 'go build servicerestart.go':
    cwd => '/root',
    creates => '/root/servicerestart',
    path => ['/usr/bin', '/usr/sbin'],
} ->
exec { '/root/servicerestart':
  cwd     => '/root',
  path    => ['/usr/bin', '/usr/sbin','/root'],
  onlyif => 'ps -u kafka',
}
}

On execution, surprise, it kept throw this feedback:

08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/File[/root/check_cluster_state.go]/ensure: defined content as '{md5}0817dbf82b74072e125f8b71ee914150'
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: panic: exit status 127
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: goroutine 1 [running]:
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: runtime.panic(0x4c2100, 0xc2100000b8)
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 	/usr/lib/go/src/pkg/runtime/panic.c:266 +0xb6
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: main.check(0x7f45b08ed150, 0xc2100000b8)
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 	/root/servicerestart.go:94 +0x4f
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: main.RunCommand(0x4ea7f0, 0x2c, 0x7f4500000000, 0x409928, 0x5d9f38)
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 	/root/servicerestart.go:87 +0x112
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: main.GetBrokerList(0x7f45b08ecf00, 0xc21003fa00, 0xe)
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 	/root/servicerestart.go:66 +0x3c
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: main.GetStatus(0xc21000a170)
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 	/root/servicerestart.go:33 +0x1e
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: main.StopBroker()
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 	/root/servicerestart.go:39 +0x21
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: main.main()
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: 	/root/servicerestart.go:15 +0x1e
08:19:44 Notice: /Stage[main]/Profiles_test::Updatekafka/Exec[go run servicerestart.go]/returns: exit status 2
08:19:44 Error: go run servicerestart.go returned 1 instead of one of [0]

The secret is in panic: exit status 127 and it seems that it’s not related to neither golang or puppet, but shell.
In my script they way to get the broker list is by 

output1 := RunCommand("echo dump | nc localhost 2181 | grep brokers")

and the error is related to not having the required binaries in you path. For example if you run 

whereis echo
echo: /bin/echo /usr/share/man/man1/echo.1.gz

So the right way to for the exec block is actually:

exec { '/root/servicerestart':
  cwd     => '/root',
  path    => ['/usr/bin', '/usr/sbin','/root','/bin','/sbin'],
  onlyif => 'ps -u kafka',
}

And then it will work.

Cheers!

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