Promote DefaultConfig() to server package

The default configuration can only be accessed from the cmd/server
package, which cannot be imported (since it's a "package main").
This change promotes DefaultConfig() to the "server" package.

Closes: #315

Signed-off-by: Jonathan Yu <jawnsy@redhat.com>

cmd/server/config.go

@@ -2,25 +2,12 @@ package main
 
 import (
 	"os"
-	"path/filepath"
 	"text/template"
 
 	"github.com/kubernetes-incubator/cri-o/server"
-	"github.com/opencontainers/runc/libcontainer/selinux"
 	"github.com/urfave/cli"
 )
 
-const (
-	ocidRoot            = "/var/lib/ocid"
-	conmonPath          = "/usr/libexec/ocid/conmon"
-	pausePath           = "/usr/libexec/ocid/pause"
-	seccompProfilePath  = "/etc/ocid/seccomp.json"
-	apparmorProfileName = "ocid-default"
-	cgroupManager       = "cgroupfs"
-	cniConfigDir        = "/etc/cni/net.d/"
-	cniBinDir           = "/opt/cni/bin/"
-)
-
 var commentedConfigTemplate = template.Must(template.New("config").Parse(`
 # The "ocid" table contains all of the server options.
 [ocid]
@@ -99,40 +86,6 @@ plugin_dir = "{{ .PluginDir }}"
 // TODO: Currently ImageDir isn't really used, so we haven't added it to this
 //       template. Add it once the storage code has been merged.
 
-// DefaultConfig returns the default configuration for ocid.
-func DefaultConfig() *server.Config {
-	return &server.Config{
-		RootConfig: server.RootConfig{
-			Root:         ocidRoot,
-			SandboxDir:   filepath.Join(ocidRoot, "sandboxes"),
-			ContainerDir: filepath.Join(ocidRoot, "containers"),
-			LogDir:       "/var/log/ocid/pods",
-		},
-		APIConfig: server.APIConfig{
-			Listen: "/var/run/ocid.sock",
-		},
-		RuntimeConfig: server.RuntimeConfig{
-			Runtime: "/usr/bin/runc",
-			Conmon:  conmonPath,
-			ConmonEnv: []string{
-				"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
-			},
-			SELinux:         selinux.SelinuxEnabled(),
-			SeccompProfile:  seccompProfilePath,
-			ApparmorProfile: apparmorProfileName,
-			CgroupManager:   cgroupManager,
-		},
-		ImageConfig: server.ImageConfig{
-			Pause:    pausePath,
-			ImageDir: filepath.Join(ocidRoot, "store"),
-		},
-		NetworkConfig: server.NetworkConfig{
-			NetworkDir: cniConfigDir,
-			PluginDir:  cniBinDir,
-		},
-	}
-}
-
 var configCommand = cli.Command{
 	Name:  "config",
 	Usage: "generate ocid configuration files",
@@ -147,7 +100,7 @@ var configCommand = cli.Command{
 		// config file. So no need to handle that here.
 		config := c.App.Metadata["config"].(*server.Config)
 		if c.Bool("default") {
-			config = DefaultConfig()
+			config = server.DefaultConfig()
 		}
 
 		// Output the commented config.

cmd/server/main.go

@@ -84,7 +84,7 @@ func main() {
 	app.Usage = "ocid server"
 	app.Version = "0.0.1"
 	app.Metadata = map[string]interface{}{
-		"config": DefaultConfig(),
+		"config": server.DefaultConfig(),
 	}
 
 	app.Flags = []cli.Flag{

server/config.go

@@ -3,8 +3,25 @@ package server
 import (
 	"bytes"
 	"io/ioutil"
+	"path/filepath"
 
 	"github.com/BurntSushi/toml"
+	"github.com/opencontainers/runc/libcontainer/selinux"
+)
+
+// Default paths if none are specified
+const (
+	ocidRoot           = "/var/lib/ocid"
+	conmonPath         = "/usr/libexec/ocid/conmon"
+	pausePath          = "/usr/libexec/ocid/pause"
+	seccompProfilePath = "/etc/ocid/seccomp.json"
+	cniConfigDir       = "/etc/cni/net.d/"
+	cniBinDir          = "/opt/cni/bin/"
+)
+
+const (
+	apparmorProfileName = "ocid-default"
+	cgroupManager       = "cgroupfs"
 )
 
 // Config represents the entire set of configuration values that can be set for
@@ -169,3 +186,37 @@ func (c *Config) ToFile(path string) error {
 
 	return ioutil.WriteFile(path, w.Bytes(), 0644)
 }
+
+// DefaultConfig returns the default configuration for ocid.
+func DefaultConfig() *Config {
+	return &Config{
+		RootConfig: RootConfig{
+			Root:         ocidRoot,
+			SandboxDir:   filepath.Join(ocidRoot, "sandboxes"),
+			ContainerDir: filepath.Join(ocidRoot, "containers"),
+			LogDir:       "/var/log/ocid/pods",
+		},
+		APIConfig: APIConfig{
+			Listen: "/var/run/ocid.sock",
+		},
+		RuntimeConfig: RuntimeConfig{
+			Runtime: "/usr/bin/runc",
+			Conmon:  conmonPath,
+			ConmonEnv: []string{
+				"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+			},
+			SELinux:         selinux.SelinuxEnabled(),
+			SeccompProfile:  seccompProfilePath,
+			ApparmorProfile: apparmorProfileName,
+			CgroupManager:   cgroupManager,
+		},
+		ImageConfig: ImageConfig{
+			Pause:    pausePath,
+			ImageDir: filepath.Join(ocidRoot, "store"),
+		},
+		NetworkConfig: NetworkConfig{
+			NetworkDir: cniConfigDir,
+			PluginDir:  cniBinDir,
+		},
+	}
+}