allow passing no,prompt,force options to clear-db (#3871)

* allow passing no,prompt,force options to clear-db

* ensure the node test runs ok

* remove clear-db option and add force-clear-db; remove no longer needed file

* add clear-db option back; force-clear-db overrides

* add clear-db option back to usage

* revert to only using --clear-db

README.md

@@ -142,14 +142,14 @@ docker run -it -v $HOME/prysm-data:/data -p 4000:4000 --name beacon-node \
 
 4) To run the beacon node, issue the command:
 ```
-docker run -it -v c:/tmp/prysm-data:/data -p 4000:4000 gcr.io/prysmaticlabs/prysm/beacon-chain:latest --datadir=/data --clear-db
+docker run -it -v c:/tmp/prysm-data:/data -p 4000:4000 gcr.io/prysmaticlabs/prysm/beacon-chain:latest --datadir=/data
 ```
 
 ### Running via Bazel
 
 1) To start your Beacon Node with Bazel, issue the command:
 ```
-bazel run //beacon-chain -- --clear-db --datadir=/tmp/prysm-data
+bazel run //beacon-chain -- --datadir=/tmp/prysm-data
 ```
 This will sync up the Beacon Node with the latest head block in the network. Note that the beacon node must be **completely synced** before attempting to initialise a validator client, otherwise the validator will not be able to complete the deposit and funds will be lost.
 

beacon-chain/main.go

@@ -59,6 +59,7 @@ var appFlags = []cli.Flag{
 	cmd.MonitoringPortFlag,
 	cmd.DisableMonitoringFlag,
 	cmd.ClearDB,
+	cmd.ForceClearDB,
 	cmd.LogFormat,
 	cmd.MaxGoroutines,
 	debug.PProfFlag,

beacon-chain/node/clear_db.go

@@ -9,38 +9,41 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
 )
 
-func confirmDelete(d db.Database, path string) (db.Database, error) {
+func confirmDelete(d db.Database, path string, force bool) (db.Database, error) {
 	var clearDB bool
 	var err error
 	reader := bufio.NewReader(os.Stdin)
+  if force {
+    clearDB = true
+  } else {
+    log.Warn("This will delete your beacon chain data base stored in your data directory. " +
+      "Your database backups will not be removed - do you want to proceed? (Y/N)")
 
-	log.Warn("This will delete your beacon chain data base stored in your data directory. " +
-		"Your database backups will not be removed - do you want to proceed? (Y/N)")
+    for {
+      fmt.Print(">> ")
 
-	for {
-		fmt.Print(">> ")
-
-		line, _, err := reader.ReadLine()
-		if err != nil {
-			return nil, err
-		}
-		trimmedLine := strings.TrimSpace(string(line))
-		lineInput := strings.ToUpper(trimmedLine)
-		if lineInput != "Y" && lineInput != "N" {
-			log.Errorf("Invalid option of %s chosen, enter Y/N", line)
-			continue
-		}
-		if lineInput == "Y" {
-			log.Warn("Deleting beaconchain.db from data directory")
-			clearDB = true
-			break
-		}
-		log.Info("Not deleting chain database, the db will be initialized" +
-			" with the current data directory.")
-		break
-	}
+      line, _, err := reader.ReadLine()
+      if err != nil {
+        return nil, err
+      }
+      trimmedLine := strings.TrimSpace(string(line))
+      lineInput := strings.ToUpper(trimmedLine)
+      if lineInput != "Y" && lineInput != "N" {
+        log.Errorf("Invalid option of %s chosen, enter Y/N", line)
+        continue
+      }
+      if lineInput == "Y" {
+        clearDB = true
+        break
+      }
+      log.Info("Not deleting chain database, the db will be initialized" +
+        " with the current data directory.")
+      break
+    }
+  }
 
 	if clearDB {
+	  log.Warning("Removing database")
 		if err := d.ClearDB(); err != nil {
 			return nil, err
 		}

beacon-chain/node/node.go

@@ -22,13 +22,13 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache/depositcache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
-	"github.com/prysmaticlabs/prysm/beacon-chain/flags"
 	"github.com/prysmaticlabs/prysm/beacon-chain/gateway"
 	interopcoldstart "github.com/prysmaticlabs/prysm/beacon-chain/interop-cold-start"
 	"github.com/prysmaticlabs/prysm/beacon-chain/operations"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
 	"github.com/prysmaticlabs/prysm/beacon-chain/rpc"
+  "github.com/prysmaticlabs/prysm/beacon-chain/flags"
 	prysmsync "github.com/prysmaticlabs/prysm/beacon-chain/sync"
 	initialsync "github.com/prysmaticlabs/prysm/beacon-chain/sync/initial-sync"
 	"github.com/prysmaticlabs/prysm/shared"
@@ -200,17 +200,19 @@ func (b *BeaconNode) Close() {
 func (b *BeaconNode) startDB(ctx *cli.Context) error {
 	baseDir := ctx.GlobalString(cmd.DataDirFlag.Name)
 	dbPath := path.Join(baseDir, beaconChainDBName)
+  clearDB := ctx.GlobalBool(cmd.ClearDB.Name)
+  forceClearDB := ctx.GlobalBool(cmd.ForceClearDB.Name)
+
 	d, err := db.NewDB(dbPath)
 	if err != nil {
 		return err
 	}
-	if b.ctx.GlobalBool(cmd.ClearDB.Name) {
-		d, err = confirmDelete(d, dbPath)
+	if clearDB || forceClearDB {
+		d, err = confirmDelete(d, dbPath, forceClearDB)
 		if err != nil {
 			return err
 		}
 	}
-
 	log.WithField("database-path", dbPath).Info("Checking DB")
 	b.db = d
 	b.depositCache = depositcache.NewDepositCache()

beacon-chain/usage.go

@@ -58,6 +58,7 @@ var appHelpFlagGroups = []flagGroup{
 			cmd.MonitoringPortFlag,
 			cmd.DisableMonitoringFlag,
 			cmd.MaxGoroutines,
+			cmd.ForceClearDB,
 			cmd.ClearDB,
 		},
 	},

scripts/start-beacon-chain.sh

@@ -13,4 +13,4 @@ while test $# -gt 0; do
     esac
 done
 
-bazel run //beacon-chain -- --clear-db --deposit-contract $DEPOSIT_CONTRACT --web3provider=wss://goerli.infura.io/ws/v3/be3fb7ed377c418087602876a40affa1
+bazel run //beacon-chain -- --clear-db --deposit-contract $DEPOSIT_CONTRACT --web3provider=wss://goerli.infura.io/ws/v3/be3fb7ed377c418087602876a40affa1

shared/cmd/flags.go

@@ -119,10 +119,15 @@ var (
 		Usage: "The encoding format of messages sent over the wire. The default is 0, which represents ssz",
 		Value: "ssz",
 	}
-	// ClearDB tells the beacon node to remove any previously stored data at the data directory.
+	// ForceClearDB removes any previously stored data at the data directory.
+	ForceClearDB = cli.BoolFlag{
+		Name:  "force-clear-db",
+		Usage: "Clear any previously stored data at the data directory",
+	}
+	// ClearDB prompts user to see if they want to remove any previously stored data at the data directory.
 	ClearDB = cli.BoolFlag{
 		Name:  "clear-db",
-		Usage: "Clears any previously stored data at the data directory",
+		Usage: "Prompt for clearing any previously stored data at the data directory",
 	}
 	// LogFormat specifies the log output format.
 	LogFormat = cli.StringFlag{