cri-o/server/config.go

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package server
import (
"bytes"
"io/ioutil"
"github.com/BurntSushi/toml"
)
// Config represents the entire set of configuration values that can be set for
// the server. This is intended to be loaded from a toml-encoded config file.
type Config struct {
RootConfig
APIConfig
RuntimeConfig
ImageConfig
}
// This structure is necessary to fake the TOML tables when parsing,
// while also not requiring a bunch of layered structs for no good
// reason.
// RootConfig represents the root of the "ocid" TOML config table.
type RootConfig struct {
// Root is a path to the "root directory" where all information not
// explicitly handled by other options will be stored.
Root string `toml:"root"`
// SandboxDir is the directory where ocid will store all of its sandbox
// state and other information.
SandboxDir string `toml:"sandbox_dir"`
// ContainerDir is the directory where ocid will store all of its container
// state and other information.
ContainerDir string `toml:"container_dir"`
}
// APIConfig represents the "ocid.api" TOML config table.
type APIConfig struct {
// Listen is the path to the AF_LOCAL socket on which cri-o will listen.
// This may support proto://addr formats later, but currently this is just
// a path.
Listen string `toml:"listen"`
}
// RuntimeConfig represents the "ocid.runtime" TOML config table.
type RuntimeConfig struct {
// Runtime is a path to the OCI runtime which ocid will be using. Currently
// the only known working choice is runC, simply because the OCI has not
// yet merged a CLI API (so we assume runC's API here).
Runtime string `toml:"runtime"`
// Conmon is the path to conmon binary, used for managing the runtime.
Conmon string `toml:"conmon"`
// ConmonEnv is the environment variable list for conmon process.
ConmonEnv []string `toml:"conmon_env"`
// SELinux determines whether or not SELinux is used for pod separation.
SELinux bool `toml:"selinux"`
}
// ImageConfig represents the "ocid.image" TOML config table.
type ImageConfig struct {
// Pause is the path to the statically linked pause container binary, used
// as the entrypoint for infra containers.
//
// TODO(cyphar): This should be replaced with a path to an OCI image
// bundle, once the OCI image/storage code has been implemented.
Pause string `toml:"pause"`
// ImageStore is the directory where the ocid image store will be stored.
// TODO: This is currently not really used because we don't have
// containers/storage integrated.
ImageDir string `toml:"image_dir"`
}
// tomlConfig is another way of looking at a Config, which is
// TOML-friendly (it has all of the explicit tables). It's just used for
// conversions.
type tomlConfig struct {
Ocid struct {
RootConfig
API struct{ APIConfig } `toml:"api"`
Runtime struct{ RuntimeConfig } `toml:"runtime"`
Image struct{ ImageConfig } `toml:"image"`
} `toml:"ocid"`
}
func (t *tomlConfig) toConfig(c *Config) {
c.RootConfig = t.Ocid.RootConfig
c.APIConfig = t.Ocid.API.APIConfig
c.RuntimeConfig = t.Ocid.Runtime.RuntimeConfig
c.ImageConfig = t.Ocid.Image.ImageConfig
}
func (t *tomlConfig) fromConfig(c *Config) {
t.Ocid.RootConfig = c.RootConfig
t.Ocid.API.APIConfig = c.APIConfig
t.Ocid.Runtime.RuntimeConfig = c.RuntimeConfig
t.Ocid.Image.ImageConfig = c.ImageConfig
}
// FromFile populates the Config from the TOML-encoded file at the given path.
// Returns errors encountered when reading or parsing the files, or nil
// otherwise.
func (c *Config) FromFile(path string) error {
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
t := new(tomlConfig)
t.fromConfig(c)
_, err = toml.Decode(string(data), t)
if err != nil {
return err
}
t.toConfig(c)
return nil
}
// ToFile outputs the given Config as a TOML-encoded file at the given path.
// Returns errors encountered when generating or writing the file, or nil
// otherwise.
func (c *Config) ToFile(path string) error {
var w bytes.Buffer
e := toml.NewEncoder(&w)
t := new(tomlConfig)
t.fromConfig(c)
if err := e.Encode(*t); err != nil {
return err
}
return ioutil.WriteFile(path, w.Bytes(), 0644)
}