main: Add CNI options

We add 2 ocid options for choosing the CNI configuration and plugin
binaries directories: --cni-config-dir and --cni-plugin-dir.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

cmd/server/config.go

@@ -17,6 +17,8 @@ const (
 	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(`
@@ -81,6 +83,17 @@ cgroup_manager = "{{ .CgroupManager }}"
 # pause is the path to the statically linked pause container binary, used
 # as the entrypoint for infra containers.
 pause = "{{ .Pause }}"
+
+# The "ocid.network" table contains settings pertaining to the
+# management of CNI plugins.
+[ocid.network]
+
+# network_dir is is where CNI network configuration
+# files are stored.
+network_dir = "{{ .NetworkDir }}"
+
+# plugin_dir is is where CNI plugin binaries are stored.
+plugin_dir = "{{ .PluginDir }}"
 `))
 
 // TODO: Currently ImageDir isn't really used, so we haven't added it to this
@@ -113,6 +126,10 @@ func DefaultConfig() *server.Config {
 			Pause:    pausePath,
 			ImageDir: filepath.Join(ocidRoot, "store"),
 		},
+		NetworkConfig: server.NetworkConfig{
+			NetworkDir: cniConfigDir,
+			PluginDir:  cniBinDir,
+		},
 	}
 }
 

cmd/server/main.go

@@ -66,6 +66,12 @@ func mergeConfig(config *server.Config, ctx *cli.Context) error {
 	if ctx.GlobalIsSet("cgroup-manager") {
 		config.CgroupManager = ctx.GlobalString("cgroup-manager")
 	}
+	if ctx.GlobalIsSet("cni-config-dir") {
+		config.NetworkDir = ctx.GlobalString("cni-config-dir")
+	}
+	if ctx.GlobalIsSet("cni-plugin-dir") {
+		config.PluginDir = ctx.GlobalString("cni-plugin-dir")
+	}
 	return nil
 }
 
@@ -157,6 +163,14 @@ func main() {
 			Name:  "cgroup-manager",
 			Usage: "cgroup manager (cgroupfs or systemd)",
 		},
+		cli.StringFlag{
+			Name:  "cni-config-dir",
+			Usage: "CNI configuration files directory",
+		},
+		cli.StringFlag{
+			Name:  "cni-plugin-dir",
+			Usage: "CNI plugin binaries directory",
+		},
 	}
 
 	// remove once https://github.com/urfave/cli/pull/544 lands