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