Merge pull request #1 from mheon/master

Initial checkin

1 files changed, 308 insertions, 0 deletions

diff --git a/libkpod/config.go b/libkpod/config.go
new file mode 100644
index 000000000..09bd3f5b9
--- /dev/null
+++ b/libkpod/config.go
@@ -0,0 +1,308 @@
+package libkpod
+
+import (
+	"bytes"
+	"io/ioutil"
+
+	"github.com/BurntSushi/toml"
+	"github.com/projectatomic/libpod/oci"
+	"github.com/opencontainers/selinux/go-selinux"
+)
+
+// Default paths if none are specified
+const (
+	crioRoot            = "/var/lib/containers/storage"
+	crioRunRoot         = "/var/run/containers/storage"
+	conmonPath          = "/usr/local/libexec/crio/conmon"
+	pauseImage          = "kubernetes/pause"
+	pauseCommand        = "/pause"
+	defaultTransport    = "docker://"
+	seccompProfilePath  = "/etc/crio/seccomp.json"
+	apparmorProfileName = "crio-default"
+	cniConfigDir        = "/etc/cni/net.d/"
+	cniBinDir           = "/opt/cni/bin/"
+	cgroupManager       = oci.CgroupfsCgroupsManager
+	lockPath            = "/run/crio.lock"
+	containerExitsDir   = oci.ContainerExitsDir
+)
+
+// 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
+	RuntimeConfig
+	ImageConfig
+	NetworkConfig
+}
+
+// ImageVolumesType describes image volume handling strategies
+type ImageVolumesType string
+
+const (
+	// ImageVolumesMkdir option is for using mkdir to handle image volumes
+	ImageVolumesMkdir ImageVolumesType = "mkdir"
+	// ImageVolumesIgnore option is for ignoring image volumes altogether
+	ImageVolumesIgnore ImageVolumesType = "ignore"
+	// ImageVolumesBind option is for using bind mounted volumes
+	ImageVolumesBind ImageVolumesType = "bind"
+)
+
+const (
+	// DefaultPidsLimit is the default value for maximum number of processes
+	// allowed inside a container
+	DefaultPidsLimit = 1024
+
+	// DefaultLogSizeMax is the default value for the maximum log size
+	// allowed for a container. Negative values mean that no limit is imposed.
+	DefaultLogSizeMax = -1
+)
+
+// 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 "crio" TOML config table.
+type RootConfig struct {
+	// Root is a path to the "root directory" where data not
+	// explicitly handled by other options will be stored.
+	Root string `toml:"root"`
+
+	// RunRoot is a path to the "run directory" where state information not
+	// explicitly handled by other options will be stored.
+	RunRoot string `toml:"runroot"`
+
+	// Storage is the name of the storage driver which handles actually
+	// storing the contents of containers.
+	Storage string `toml:"storage_driver"`
+
+	// StorageOption is a list of storage driver specific options.
+	StorageOptions []string `toml:"storage_option"`
+
+	// LogDir is the default log directory were all logs will go unless kubelet
+	// tells us to put them somewhere else.
+	LogDir string `toml:"log_dir"`
+
+	// FileLocking specifies whether to use file-based or in-memory locking
+	// File-based locking is required when multiple users of libkpod are
+	// present on the same system
+	FileLocking bool `toml:"file_locking"`
+}
+
+// RuntimeConfig represents the "crio.runtime" TOML config table.
+type RuntimeConfig struct {
+	// Runtime is the OCI compatible runtime used for trusted container workloads.
+	// This is a mandatory setting as this runtime will be the default one and
+	// will also be used for untrusted container workloads if
+	// RuntimeUntrustedWorkload is not set.
+	Runtime string `toml:"runtime"`
+
+	// RuntimeUntrustedWorkload is the OCI compatible runtime used for untrusted
+	// container workloads. This is an optional setting, except if
+	// DefaultWorkloadTrust is set to "untrusted".
+	RuntimeUntrustedWorkload string `toml:"runtime_untrusted_workload"`
+
+	// DefaultWorkloadTrust is the default level of trust crio puts in container
+	// workloads. This can either be "trusted" or "untrusted" and the default
+	// is "trusted"
+	// Containers can be run through different container runtimes, depending on
+	// the trust hints we receive from kubelet:
+	// - If kubelet tags a container workload as untrusted, crio will try first
+	// to run it through the untrusted container workload runtime. If it is not
+	// set, crio will use the trusted runtime.
+	// - If kubelet does not provide any information about the container workload trust
+	// level, the selected runtime will depend on the DefaultWorkloadTrust setting.
+	// If it is set to "untrusted", then all containers except for the host privileged
+	// ones, will be run by the RuntimeUntrustedWorkload runtime. Host privileged
+	// containers are by definition trusted and will always use the trusted container
+	// runtime. If DefaultWorkloadTrust is set to "trusted", crio will use the trusted
+	// container runtime for all containers.
+	DefaultWorkloadTrust string `toml:"default_workload_trust"`
+
+	// NoPivot instructs the runtime to not use `pivot_root`, but instead use `MS_MOVE`
+	NoPivot bool `toml:"no_pivot"`
+
+	// 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"`
+
+	// SeccompProfile is the seccomp json profile path which is used as the
+	// default for the runtime.
+	SeccompProfile string `toml:"seccomp_profile"`
+
+	// ApparmorProfile is the apparmor profile name which is used as the
+	// default for the runtime.
+	ApparmorProfile string `toml:"apparmor_profile"`
+
+	// CgroupManager is the manager implementation name which is used to
+	// handle cgroups for containers.
+	CgroupManager string `toml:"cgroup_manager"`
+
+	// HooksDirPath location of oci hooks config files
+	HooksDirPath string `toml:"hooks_dir_path"`
+
+	// DefaultMounts is the list of mounts to be mounted for each container
+	// The format of each mount is "host-path:container-path"
+	DefaultMounts []string `toml:"default_mounts"`
+
+	// Hooks List of hooks to run with container
+	Hooks map[string]HookParams
+
+	// PidsLimit is the number of processes each container is restricted to
+	// by the cgroup process number controller.
+	PidsLimit int64 `toml:"pids_limit"`
+
+	// LogSizeMax is the maximum number of bytes after which the log file
+	// will be truncated. It can be expressed as a human-friendly string
+	// that is parsed to bytes.
+	// Negative values indicate that the log file won't be truncated.
+	LogSizeMax int64 `toml:"log_size_max"`
+
+	// ContainerExitsDir is the directory in which container exit files are
+	// written to by conmon.
+	ContainerExitsDir string `toml:"container_exits_dir"`
+}
+
+// ImageConfig represents the "crio.image" TOML config table.
+type ImageConfig struct {
+	// DefaultTransport is a value we prefix to image names that fail to
+	// validate source references.
+	DefaultTransport string `toml:"default_transport"`
+	// PauseImage is the name of an image which we use to instantiate infra
+	// containers.
+	PauseImage string `toml:"pause_image"`
+	// PauseCommand is the path of the binary we run in an infra
+	// container that's been instantiated using PauseImage.
+	PauseCommand string `toml:"pause_command"`
+	// SignaturePolicyPath is the name of the file which decides what sort
+	// of policy we use when deciding whether or not to trust an image that
+	// we've pulled.  Outside of testing situations, it is strongly advised
+	// that this be left unspecified so that the default system-wide policy
+	// will be used.
+	SignaturePolicyPath string `toml:"signature_policy"`
+	// InsecureRegistries is a list of registries that must be contacted w/o
+	// TLS verification.
+	InsecureRegistries []string `toml:"insecure_registries"`
+	// ImageVolumes controls how volumes specified in image config are handled
+	ImageVolumes ImageVolumesType `toml:"image_volumes"`
+	// Registries holds a list of registries used to pull unqualified images
+	Registries []string `toml:"registries"`
+}
+
+// NetworkConfig represents the "crio.network" TOML config table
+type NetworkConfig struct {
+	// NetworkDir is where CNI network configuration files are stored.
+	NetworkDir string `toml:"network_dir"`
+
+	// PluginDir is where CNI plugin binaries are stored.
+	PluginDir string `toml:"plugin_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 {
+	Crio struct {
+		RootConfig
+		Runtime struct{ RuntimeConfig } `toml:"runtime"`
+		Image   struct{ ImageConfig }   `toml:"image"`
+		Network struct{ NetworkConfig } `toml:"network"`
+	} `toml:"crio"`
+}
+
+func (t *tomlConfig) toConfig(c *Config) {
+	c.RootConfig = t.Crio.RootConfig
+	c.RuntimeConfig = t.Crio.Runtime.RuntimeConfig
+	c.ImageConfig = t.Crio.Image.ImageConfig
+	c.NetworkConfig = t.Crio.Network.NetworkConfig
+}
+
+func (t *tomlConfig) fromConfig(c *Config) {
+	t.Crio.RootConfig = c.RootConfig
+	t.Crio.Runtime.RuntimeConfig = c.RuntimeConfig
+	t.Crio.Image.ImageConfig = c.ImageConfig
+	t.Crio.Network.NetworkConfig = c.NetworkConfig
+}
+
+// UpdateFromFile 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) UpdateFromFile(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)
+}
+
+// DefaultConfig returns the default configuration for crio.
+func DefaultConfig() *Config {
+	return &Config{
+		RootConfig: RootConfig{
+			Root:        crioRoot,
+			RunRoot:     crioRunRoot,
+			LogDir:      "/var/log/crio/pods",
+			FileLocking: true,
+		},
+		RuntimeConfig: RuntimeConfig{
+			Runtime:                  "/usr/bin/runc",
+			RuntimeUntrustedWorkload: "",
+			DefaultWorkloadTrust:     "trusted",
+
+			Conmon: conmonPath,
+			ConmonEnv: []string{
+				"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+			},
+			SELinux:           selinux.GetEnabled(),
+			SeccompProfile:    seccompProfilePath,
+			ApparmorProfile:   apparmorProfileName,
+			CgroupManager:     cgroupManager,
+			PidsLimit:         DefaultPidsLimit,
+			ContainerExitsDir: containerExitsDir,
+			HooksDirPath:      DefaultHooksDirPath,
+			LogSizeMax:        DefaultLogSizeMax,
+		},
+		ImageConfig: ImageConfig{
+			DefaultTransport:    defaultTransport,
+			PauseImage:          pauseImage,
+			PauseCommand:        pauseCommand,
+			SignaturePolicyPath: "",
+			ImageVolumes:        ImageVolumesMkdir,
+		},
+		NetworkConfig: NetworkConfig{
+			NetworkDir: cniConfigDir,
+			PluginDir:  cniBinDir,
+		},
+	}
+}