misc: add TimeFunc()

This allows it to be re-used easily when things are broken up into
more packages later.

cmd/mkinitfs/main.go

@@ -23,11 +23,6 @@ import (
 	"gitlab.com/postmarketOS/postmarketos-mkinitfs/pkgs/deviceinfo"
 )
 
-func timeFunc(start time.Time, name string) {
-	elapsed := time.Since(start)
-	log.Printf("%s completed in: %s", name, elapsed)
-}
-
 func main() {
 	deviceinfoFile := "/etc/deviceinfo"
 	if !exists(deviceinfoFile) {
@@ -45,7 +40,7 @@ func main() {
 	outDir := flag.String("d", "/boot", "Directory to output initfs(-extra) and other boot files")
 	flag.Parse()
 
-	defer timeFunc(time.Now(), "mkinitfs")
+	defer misc.TimeFunc(time.Now(), "mkinitfs")
 
 	kernVer, err := getKernelVersion()
 	if err != nil {

internal/misc/misc.go

@@ -4,10 +4,12 @@
 package misc
 
 import (
-	"golang.org/x/sys/unix"
 	"log"
 	"os"
 	"path/filepath"
+	"time"
+
+	"golang.org/x/sys/unix"
 )
 
 // Converts a relative symlink target path (e.g. ../../lib/foo.so), that is
@@ -74,3 +76,13 @@ func RemoveDuplicates(in []string) (out []string) {
 
 	return
 }
+
+// Prints the execution time of a function, not meant to be very
+// sensitive/accurate, but good enough to gauge rough run times.
+// Meant to be called as:
+//
+//	defer misc.TimeFunc(time.Now(), "foo")
+func TimeFunc(start time.Time, name string) {
+	elapsed := time.Since(start)
+	log.Printf("%s completed in: %s", name, elapsed)
+}