package libpod import ( "database/sql" "encoding/json" "io/ioutil" "path/filepath" "time" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" // Use SQLite backend for sql package _ "github.com/mattn/go-sqlite3" ) // Performs database setup including by not limited to initializing tables in // the database func prepareDB(db *sql.DB) (err error) { // TODO create pod tables // TODO add Pod ID to CreateStaticContainer as a FOREIGN KEY referencing podStatic(Id) // TODO add ctr shared namespaces information - A separate table, probably? So we can FOREIGN KEY the ID // TODO schema migration might be necessary and should be handled here // TODO add a table for the runtime, and refuse to load the database if the runtime configuration // does not match the one in the database // Enable foreign keys in SQLite if _, err := db.Exec("PRAGMA foreign_keys = ON;"); err != nil { return errors.Wrapf(err, "error enabling foreign key support in database") } // Create a table for unchanging container data const createCtr = ` CREATE TABLE IF NOT EXISTS containers( Id TEXT NOT NULL PRIMARY KEY, Name TEXT NOT NULL UNIQUE, MountLabel TEXT NOT NULL, StaticDir TEXT NOT NULL, Stdin INTEGER NOT NULL, LabelsJSON TEXT NOT NULL, StopSignal INTEGER NOT NULL, CreatedTime TEXT NOT NULL, RootfsImageID TEXT NOT NULL, RootfsImageName TEXT NOT NULL, UseImageConfig INTEGER NOT NULL, CHECK (Stdin IN (0, 1)), CHECK (UseImageConfig IN (0, 1)), CHECK (StopSignal>=0) ); ` // Create a table for changing container state const createCtrState = ` CREATE TABLE IF NOT EXISTS containerState( Id TEXT NOT NULL PRIMARY KEY, State INTEGER NOT NULL, ConfigPath TEXT NOT NULL, RunDir TEXT NOT NULL, Mountpoint TEXT NOT NULL, StartedTime TEXT NUT NULL, FinishedTime TEXT NOT NULL, ExitCode INTEGER NOT NULL, CHECK (State>0), FOREIGN KEY (Id) REFERENCES containers(Id) DEFERRABLE INITIALLY DEFERRED ); ` // Create the tables tx, err := db.Begin() if err != nil { return errors.Wrapf(err, "error beginning database transaction") } defer func() { if err != nil { if err2 := tx.Rollback(); err2 != nil { logrus.Errorf("Error rolling back transaction to create tables: %v", err2) } } }() if _, err := tx.Exec(createCtr); err != nil { return errors.Wrapf(err, "error creating containers table in database") } if _, err := tx.Exec(createCtrState); err != nil { return errors.Wrapf(err, "error creating container state table in database") } if err := tx.Commit(); err != nil { return errors.Wrapf(err, "error committing table creation transaction in database") } return nil } // Get filename for OCI spec on disk func getSpecPath(specsDir, id string) string { return filepath.Join(specsDir, id) } // Convert a bool into SQL-readable format func boolToSQL(b bool) int { if b { return 1 } return 0 } // Convert a bool from SQL-readable format func boolFromSQL(i int) bool { return i != 0 } // Convert a time.Time into SQL-readable format func timeToSQL(t time.Time) string { return t.Format(time.RFC3339Nano) } // Convert a SQL-readable time back to a time.Time func timeFromSQL(s string) (time.Time, error) { return time.Parse(time.RFC3339Nano, s) } // Interface to abstract sql.Rows and sql.Row so they can both be used type scannable interface { Scan(dest ...interface{}) error } // Read a single container from a single row result in the database func ctrFromScannable(row scannable, runtime *Runtime, specsDir string) (*Container, error) { var ( id string name string mountLabel string staticDir string stdin int labelsJSON string stopSignal uint createdTimeString string rootfsImageID string rootfsImageName string useImageConfig int state int configPath string runDir string mountpoint string startedTimeString string finishedTimeString string exitCode int32 ) err := row.Scan( &id, &name, &mountLabel, &staticDir, &stdin, &labelsJSON, &stopSignal, &createdTimeString, &rootfsImageID, &rootfsImageName, &useImageConfig, &state, &configPath, &runDir, &mountpoint, &startedTimeString, &finishedTimeString, &exitCode) if err != nil { if err == sql.ErrNoRows { return nil, ErrNoSuchCtr } return nil, errors.Wrapf(err, "error parsing database row into container") } ctr := new(Container) ctr.config = new(containerConfig) ctr.state = new(containerRuntimeInfo) ctr.config.ID = id ctr.config.Name = name ctr.config.RootfsImageID = rootfsImageID ctr.config.RootfsImageName = rootfsImageName ctr.config.UseImageConfig = boolFromSQL(useImageConfig) ctr.config.MountLabel = mountLabel ctr.config.StaticDir = staticDir ctr.config.Stdin = boolFromSQL(stdin) ctr.config.StopSignal = stopSignal ctr.state.State = ContainerState(state) ctr.state.ConfigPath = configPath ctr.state.RunDir = runDir ctr.state.Mountpoint = mountpoint ctr.state.ExitCode = exitCode // TODO should we store this in the database separately instead? if ctr.state.Mountpoint != "" { ctr.state.Mounted = true } labels := make(map[string]string) if err := json.Unmarshal([]byte(labelsJSON), &labels); err != nil { return nil, errors.Wrapf(err, "error parsing container %s labels JSON", id) } ctr.config.Labels = labels createdTime, err := timeFromSQL(createdTimeString) if err != nil { return nil, errors.Wrapf(err, "error parsing container %s created time", id) } ctr.config.CreatedTime = createdTime startedTime, err := timeFromSQL(startedTimeString) if err != nil { return nil, errors.Wrapf(err, "error parsing container %s started time", id) } ctr.state.StartedTime = startedTime finishedTime, err := timeFromSQL(finishedTimeString) if err != nil { return nil, errors.Wrapf(err, "error parsing container %s finished time", id) } ctr.state.FinishedTime = finishedTime ctr.valid = true ctr.runtime = runtime // Retrieve the spec from disk ociSpec := new(spec.Spec) specPath := getSpecPath(specsDir, id) fileContents, err := ioutil.ReadFile(specPath) if err != nil { return nil, errors.Wrapf(err, "error reading container %s OCI spec", id) } if err := json.Unmarshal(fileContents, ociSpec); err != nil { return nil, errors.Wrapf(err, "error parsing container %s OCI spec", id) } ctr.config.Spec = ociSpec return ctr, nil }