feat: move banner, embed, and run at v8 upgrade only

1. Embed the banner in the upgrades subsystem instead of reading it at
runtime.
2. Print it all at once instead of line-by-line.
3. Run it in the v8 upgrade itself.

chain/consensus/filcns/upgrades.go

@@ -2,9 +2,12 @@ package filcns
 
 import (
 	"context"
+	"fmt"
 	"runtime"
 	"time"
 
+	_ "embed"
+
 	"github.com/docker/go-units"
 	"github.com/ipfs/go-cid"
 	cbor "github.com/ipfs/go-ipld-cbor"
@@ -47,6 +50,9 @@ import (
 	"github.com/filecoin-project/lotus/node/bundle"
 )
 
+//go:embed FVMLiftoff.txt
+var fvmLiftoffBanner string
+
 func DefaultUpgradeSchedule() stmgr.UpgradeSchedule {
 	var us stmgr.UpgradeSchedule
 
@@ -1338,6 +1344,8 @@ func UpgradeActorsV8(ctx context.Context, sm *stmgr.StateManager, cache stmgr.Mi
 		return cid.Undef, xerrors.Errorf("migrating actors v7 state: %w", err)
 	}
 
+	fmt.Print(fvmLiftoffBanner)
+
 	return newRoot, nil
 }
 

chain/stmgr/forks.go

@@ -1,12 +1,9 @@
 package stmgr
 
 import (
-	"bufio"
 	"bytes"
 	"context"
 	"encoding/binary"
-	"fmt"
-	"os"
 	"sort"
 	"sync"
 	"time"
@@ -195,13 +192,6 @@ func (sm *StateManager) HandleStateForks(ctx context.Context, root cid.Cid, heig
 			"to", retCid,
 			"duration", time.Since(startTime),
 		)
-
-		f, _ := os.Open("/Users/jennijuju/filecoin/lotus/FVMLiftoff.txt")
-		scanner := bufio.NewScanner(f)
-		for scanner.Scan() {
-			line := scanner.Text()
-			fmt.Println(line)
-		}
 	}
 
 	return retCid, nil