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package libpod
import (
"os"
"sync"
is "github.com/containers/image/storage"
"github.com/containers/image/types"
"github.com/containers/storage"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/ulule/deepcopier"
)
// A RuntimeOption is a functional option which alters the Runtime created by
// NewRuntime
type RuntimeOption func(*Runtime) error
// Runtime is the core libpod runtime
type Runtime struct {
config *RuntimeConfig
state State
store storage.Store
storageService *storageService
imageContext *types.SystemContext
ociRuntime *OCIRuntime
valid bool
lock sync.RWMutex
}
// RuntimeConfig contains configuration options used to set up the runtime
type RuntimeConfig struct {
StorageConfig storage.StoreOptions
ImageDefaultTransport string
InsecureRegistries []string
Registries []string
SignaturePolicyPath string
RuntimePath string
ConmonPath string
ConmonEnvVars []string
CgroupManager string
StaticDir string
TmpDir string
SelinuxEnabled bool
PidsLimit int64
MaxLogSize int64
NoPivotRoot bool
}
var (
defaultRuntimeConfig = RuntimeConfig{
// Leave this empty so containers/storage will use its defaults
StorageConfig: storage.StoreOptions{},
ImageDefaultTransport: "docker://",
RuntimePath: "/usr/bin/runc",
ConmonPath: "/usr/local/libexec/crio/conmon",
ConmonEnvVars: []string{
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
},
CgroupManager: "cgroupfs",
StaticDir: "/var/lib/libpod",
TmpDir: "/var/run/libpod",
SelinuxEnabled: false,
PidsLimit: 1024,
MaxLogSize: -1,
NoPivotRoot: false,
}
)
// NewRuntime creates a new container runtime
// Options can be passed to override the default configuration for the runtime
func NewRuntime(options ...RuntimeOption) (runtime *Runtime, err error) {
runtime = new(Runtime)
runtime.config = new(RuntimeConfig)
// Copy the default configuration
deepcopier.Copy(defaultRuntimeConfig).To(runtime.config)
// Overwrite it with user-given configuration options
for _, opt := range options {
if err := opt(runtime); err != nil {
return nil, errors.Wrapf(err, "error configuring runtime")
}
}
// Set up containers/storage
store, err := storage.GetStore(runtime.config.StorageConfig)
if err != nil {
return nil, err
}
runtime.store = store
is.Transport.SetStore(store)
defer func() {
if err != nil {
// Don't forcibly shut down
// We could be opening a store in use by another libpod
_, err2 := runtime.store.Shutdown(false)
if err2 != nil {
logrus.Errorf("Error removing store for partially-created runtime: %s", err2)
}
}
}()
// Set up a storage service for creating container root filesystems from
// images
storageService, err := getStorageService(runtime.store)
if err != nil {
return nil, err
}
runtime.storageService = storageService
// Set up containers/image
runtime.imageContext = &types.SystemContext{
SignaturePolicyPath: runtime.config.SignaturePolicyPath,
}
// Set up the state
state, err := NewInMemoryState()
if err != nil {
return nil, err
}
runtime.state = state
// Make an OCI runtime to perform container operations
ociRuntime, err := newOCIRuntime("runc", runtime.config.RuntimePath,
runtime.config.ConmonPath, runtime.config.ConmonEnvVars,
runtime.config.CgroupManager, runtime.config.TmpDir,
runtime.config.MaxLogSize, runtime.config.NoPivotRoot)
if err != nil {
return nil, err
}
runtime.ociRuntime = ociRuntime
// Make the static files directory if it does not exist
if err := os.MkdirAll(runtime.config.StaticDir, 0755); err != nil {
// The directory is allowed to exist
if !os.IsExist(err) {
return nil, errors.Wrapf(err, "error creating runtime static files directory %s",
runtime.config.StaticDir)
}
}
// Make the per-boot files directory if it does not exist
if err := os.MkdirAll(runtime.config.TmpDir, 0755); err != nil {
// The directory is allowed to exist
if !os.IsExist(err) {
return nil, errors.Wrapf(err, "error creating runtime temporary files directory %s",
runtime.config.TmpDir)
}
}
// Mark the runtime as valid - ready to be used, cannot be modified
// further
runtime.valid = true
return runtime, nil
}
// GetConfig returns a copy of the configuration used by the runtime
func (r *Runtime) GetConfig() *RuntimeConfig {
r.lock.RLock()
defer r.lock.RUnlock()
if !r.valid {
return nil
}
config := new(RuntimeConfig)
// Copy so the caller won't be able to modify the actual config
deepcopier.Copy(r.config).To(config)
return config
}
// Shutdown shuts down the runtime and associated containers and storage
// If force is true, containers and mounted storage will be shut down before
// cleaning up; if force is false, an error will be returned if there are
// still containers running or mounted
func (r *Runtime) Shutdown(force bool) error {
r.lock.Lock()
defer r.lock.Unlock()
if !r.valid {
return ErrRuntimeStopped
}
r.valid = false
_, err := r.store.Shutdown(force)
return err
}
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