cmd/utils: implement configurable developer (--dev) account options (#21301)

* geth,utils: implement configurable developer account options

Prior to this change --dev (developer) mode
generated one account with an empty password,
irrespective of existing --password and --miner.etherbase
options.

This change makes --dev mode compatible with these
existing flags.

--dev mode may now be used in conjunction with
--password and --miner.etherbase flags to configure
the developer faucet using an existing keystore or
in creating a new account.

Signed-off-by: meows <b5c6@protonmail.com>

* main: remove key/pass flags from usage developer section

These flags are included already in other sections,
and it is not desired to duplicate them.

They were originally included in this section
along with added support for these flags in the
developer mode.

Signed-off-by: meows <b5c6@protonmail.com>

cmd/utils/flags.go

@@ -1613,17 +1613,27 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
 		// Create new developer account or reuse existing one
 		var (
 			developer  accounts.Account
+			passphrase string
 			err        error
 		)
-		if accs := ks.Accounts(); len(accs) > 0 {
+		if list := MakePasswordList(ctx); len(list) > 0 {
+			// Just take the first value. Although the function returns a possible multiple values and
+			// some usages iterate through them as attempts, that doesn't make sense in this setting,
+			// when we're definitely concerned with only one account.
+			passphrase = list[0]
+		}
+		// setEtherbase has been called above, configuring the miner address from command line flags.
+		if cfg.Miner.Etherbase != (common.Address{}) {
+			developer = accounts.Account{Address: cfg.Miner.Etherbase}
+		} else if accs := ks.Accounts(); len(accs) > 0 {
 			developer = ks.Accounts()[0]
 		} else {
-			developer, err = ks.NewAccount("")
+			developer, err = ks.NewAccount(passphrase)
 			if err != nil {
 				Fatalf("Failed to create developer account: %v", err)
 			}
 		}
-		if err := ks.Unlock(developer, ""); err != nil {
+		if err := ks.Unlock(developer, passphrase); err != nil {
 			Fatalf("Failed to unlock developer account: %v", err)
 		}
 		log.Info("Using developer account", "address", developer.Address)