ulog: depend on log.Default() so prefixes are propagated through ulog.Log

Signed-off-by: Chris Koch <[email protected]>

Author: hugelgupf

go.mod

@@ -1,6 +1,6 @@
 module github.com/u-root/uio
 
-go 1.15
+go 1.16
 
 require (
 	github.com/josharian/native v1.0.1-0.20221213033349-c1e37c09b531

ulog/log.go

@@ -9,10 +9,7 @@
 // testing.TB.Logf. To use the test logger import "ulog/ulogtest".
 package ulog
 
-import (
-	"log"
-	"os"
-)
+import "log"
 
 // Logger is a log receptacle.
 //
@@ -22,8 +19,8 @@ type Logger interface {
 	Print(v ...interface{})
 }
 
-// Log is a Logger that prints to stderr, like the default log package.
-var Log Logger = log.New(os.Stderr, "", log.LstdFlags)
+// Log is a Logger that prints to the log package's default logger.
+var Log Logger = log.Default()
 
 type emptyLogger struct{}
 

ulog/log_test.go

@@ -0,0 +1,21 @@
+package ulog
+
+import (
+	"log"
+	"strings"
+	"testing"
+)
+
+func TestDefault(t *testing.T) {
+	var b strings.Builder
+	log.SetPrefix("[foobar] ")
+	log.SetOutput(&b)
+	log.SetFlags(0)
+
+	Log.Printf("Some output")
+
+	want := "[foobar] Some output\n"
+	if got := b.String(); got != want {
+		t.Errorf("log is %q, want %q", got, want)
+	}
+}