Move around code for better clarity

pkg/init/docker/docker.go

@@ -0,0 +1,53 @@
+package docker
+
+import (
+	"syscall"
+
+	"github.com/rancher/os/config"
+	"github.com/rancher/os/pkg/dfs"
+)
+
+func Start(cfg *config.CloudConfig) (chan interface{}, error) {
+	launchConfig, args := GetLaunchConfig(cfg, &cfg.Rancher.BootstrapDocker)
+	launchConfig.Fork = true
+	launchConfig.LogFile = ""
+	launchConfig.NoLog = true
+
+	cmd, err := dfs.LaunchDocker(launchConfig, config.SystemDockerBin, args...)
+	if err != nil {
+		return nil, err
+	}
+
+	c := make(chan interface{})
+	go func() {
+		<-c
+		cmd.Process.Signal(syscall.SIGTERM)
+		cmd.Wait()
+		c <- struct{}{}
+	}()
+
+	return c, nil
+}
+
+func Stop(c chan interface{}) error {
+	c <- struct{}{}
+	<-c
+
+	return nil
+}
+
+func GetLaunchConfig(cfg *config.CloudConfig, dockerCfg *config.DockerConfig) (*dfs.Config, []string) {
+	var launchConfig dfs.Config
+
+	args := dfs.ParseConfig(&launchConfig, dockerCfg.FullArgs()...)
+
+	launchConfig.DNSConfig.Nameservers = cfg.Rancher.Defaults.Network.DNS.Nameservers
+	launchConfig.DNSConfig.Search = cfg.Rancher.Defaults.Network.DNS.Search
+	launchConfig.Environment = dockerCfg.Environment
+
+	if !cfg.Rancher.Debug {
+		launchConfig.LogFile = config.SystemDockerLog
+	}
+
+	return &launchConfig, args
+}