.

wcfs/gogccrash

@@ -5,7 +5,6 @@ export GOTRACEBACK=crash
 ulimit -c unlimited
 
 go test -c
-#export DBTail_SEED=1602769537289632682
 
 cwd=$(pwd)
 

wcfs/δbtail_test.go

@@ -34,7 +34,6 @@ import (
 	"reflect"
 	"regexp"
 	"sort"
-	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -1541,7 +1540,10 @@ func TestΔBTail(t *testing.T) {
 
 }
 
-var verylongFlag = flag.Bool("verylong", false, `switch tests to run in "very long" mode`)
+var (
+	verylongFlag = flag.Bool("verylong", false, `switch tests to run in "very long" mode`)
+	randseedFlag = flag.Int64("randseed", -1, `seed for random number generator`)
+)
 
 // TestΔBTailAllStructs verifies ΔBtail on tree topologies generated by AllStructs.
 func TestΔBTailAllStructs(t *testing.T) {
@@ -1583,14 +1585,9 @@ func TestΔBTailAllStructs(t *testing.T) {
 	}()
 
 	// random seed
-	seed := time.Now().UnixNano()
-	seeds := os.Getenv("DBTail_SEED")
-	if seeds != "" {
-		var err error
-		seed, err = strconv.ParseInt(seeds, 10, 64)
-		if err != nil {
-			t.Fatalf("invalid $DBTail_SEED=%s: %s", seeds, err)
-		}
+	seed := *randseedFlag
+	if seed == -1 {
+		seed = time.Now().UnixNano()
 	}
 	rng := rand.New(rand.NewSource(seed))
 	t.Logf("# maxdepth=%d maxsplit=%d nkeys=%d n=%d seed=%d", maxdepth, maxsplit, nkeys, n, seed)