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package libpod
import (
"encoding/json"
"path/filepath"
"github.com/boltdb/bolt"
"github.com/containers/storage"
"github.com/pkg/errors"
)
const (
idRegistryName = "id-registry"
nameRegistryName = "name-registry"
ctrConfigName = "container-config"
ctrStateName = "container-state"
netNSName = "net-ns"
runtimeConfigName = "runtime-config"
ctrDependsName = "container-depends"
)
var (
idRegistryBkt = []byte(idRegistryName)
nameRegistryBkt = []byte(nameRegistryName)
ctrConfigBkt = []byte(ctrConfigName)
ctrStateBkt = []byte(ctrStateName)
netNSBkt = []byte(netNSName)
runtimeConfigBkt = []byte(runtimeConfigName)
ctrDependsBkt = []byte(ctrDependsName)
)
// Check if the configuration of the database is compatible with the
// configuration of the runtime opening it
// If there is no runtime configuration loaded, load our own
func checkRuntimeConfig(db *bolt.DB, runtime *Runtime) error {
var (
staticDir = []byte("static-dir")
tmpDir = []byte("tmp-dir")
runRoot = []byte("run-root")
graphRoot = []byte("graph-root")
graphDriverName = []byte("graph-driver-name")
)
err := db.Update(func(tx *bolt.Tx) error {
configBkt, err := getRuntimeConfigBucket(tx)
if err != nil {
return err
}
if err := validateDBAgainstConfig(configBkt, "static dir",
runtime.config.StaticDir, staticDir); err != nil {
return err
}
if err := validateDBAgainstConfig(configBkt, "tmp dir",
runtime.config.TmpDir, tmpDir); err != nil {
return err
}
if err := validateDBAgainstConfig(configBkt, "run root",
runtime.config.StorageConfig.RunRoot, runRoot); err != nil {
return err
}
if err := validateDBAgainstConfig(configBkt, "graph root",
runtime.config.StorageConfig.GraphRoot, graphRoot); err != nil {
return err
}
return validateDBAgainstConfig(configBkt, "graph driver name",
runtime.config.StorageConfig.GraphDriverName,
graphDriverName)
})
return err
}
// Validate a configuration entry in the DB against current runtime config
// If the given configuration key does not exist it will be created
func validateDBAgainstConfig(bucket *bolt.Bucket, fieldName, runtimeValue string, keyName []byte) error {
keyBytes := bucket.Get(keyName)
if keyBytes == nil {
if err := bucket.Put(keyName, []byte(runtimeValue)); err != nil {
return errors.Wrapf(err, "error updating %s in DB runtime config", fieldName)
}
} else {
if runtimeValue != string(keyBytes) {
return errors.Wrapf(ErrDBBadConfig, "database %s %s does not match our %s %s",
fieldName, string(keyBytes), fieldName, runtimeValue)
}
}
return nil
}
func (s *BoltState) getDBCon() (*bolt.DB, error) {
db, err := bolt.Open(s.dbPath, 0600, nil)
if err != nil {
return nil, errors.Wrapf(err, "error opening database %s", s.dbPath)
}
return db, nil
}
func getIDBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
bkt := tx.Bucket(idRegistryBkt)
if bkt == nil {
return nil, errors.Wrapf(ErrDBBadConfig, "id registry bucket not found in DB")
}
return bkt, nil
}
func getNamesBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
bkt := tx.Bucket(nameRegistryBkt)
if bkt == nil {
return nil, errors.Wrapf(ErrDBBadConfig, "name registry bucket not found in DB")
}
return bkt, nil
}
func getCtrConfigBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
bkt := tx.Bucket(ctrConfigBkt)
if bkt == nil {
return nil, errors.Wrapf(ErrDBBadConfig, "container config bucket not found in DB")
}
return bkt, nil
}
func getCtrStateBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
bkt := tx.Bucket(ctrStateBkt)
if bkt == nil {
return nil, errors.Wrapf(ErrDBBadConfig, "container state bucket not found in DB")
}
return bkt, nil
}
func getNetNSBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
bkt := tx.Bucket(netNSBkt)
if bkt == nil {
return nil, errors.Wrapf(ErrDBBadConfig, "network namespace bucket not found in DB")
}
return bkt, nil
}
func getRuntimeConfigBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
bkt := tx.Bucket(runtimeConfigBkt)
if bkt == nil {
return nil, errors.Wrapf(ErrDBBadConfig, "runtime configuration bucket not found in DB")
}
return bkt, nil
}
func getCtrDependsBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
bkt := tx.Bucket(ctrDependsBkt)
if bkt == nil {
return nil, errors.Wrapf(ErrDBBadConfig, "container dependencies bucket not found in DB")
}
return bkt, nil
}
func (s *BoltState) getContainerFromDB(id []byte, ctr *Container, config, state, netNS *bolt.Bucket) error {
configBytes := config.Get(id)
if configBytes == nil {
return errors.Wrapf(ErrNoSuchCtr, "error unmarshalling container %s config", string(id))
}
if err := json.Unmarshal(configBytes, ctr.config); err != nil {
return errors.Wrapf(err, "error unmarshalling container %s config", string(id))
}
stateBytes := state.Get(id)
if stateBytes == nil {
return errors.Wrapf(ErrInternal, "container %s has config but no state", string(id))
}
if err := json.Unmarshal(stateBytes, ctr.state); err != nil {
return errors.Wrapf(err, "error unmarshalling container %s state", string(id))
}
// The container may not have a network namespace, so it's OK if this is
// nil
netNSBytes := netNS.Get(id)
if netNSBytes != nil {
nsPath := string(netNSBytes)
netNS, err := joinNetNS(nsPath)
if err != nil {
return errors.Wrapf(err, "error joining network namespace for container %s", string(id))
}
ctr.state.NetNS = netNS
}
// Get the lock
lockPath := filepath.Join(s.lockDir, string(id))
lock, err := storage.GetLockfile(lockPath)
if err != nil {
return errors.Wrapf(err, "error retrieving lockfile for container %s", string(id))
}
ctr.lock = lock
ctr.runtime = s.runtime
ctr.valid = true
return nil
}
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