small cleanup

cmd/dkl-local-server/bootv2.go

@@ -331,19 +331,6 @@ func buildLayersCombo(host *localconfig.Host, cfg *config.Config, signer crypto.
 
 	cmdOut := new(bytes.Buffer)
 
-	run := func(prog string, arg ...string) bool {
-		cmdOut.Reset()
-
-		cmd := exec.Command(prog, arg...)
-		cmd.Stdout = cmdOut // os.Stdout
-		cmd.Stderr = os.Stderr
-		if e := cmd.Run(); e != nil {
-			err = fmt.Errorf("%s %q failed: %w", cmd.Path, cmd.Args, e)
-			return false
-		}
-		return true
-	}
-
 	for i, layer := range layers {
 		if layer == "modules" {
 			continue // modules are in the initrd with boot v2
@@ -374,20 +361,20 @@ func buildLayersCombo(host *localconfig.Host, cfg *config.Config, signer crypto.
 			mode = "--create"
 		}
 
-		if !run("tar", mode, "-p", "-f", tmpTar, "-C", mountPoint, ".") {
+		if err = runCmd(cmdOut, "tar", mode, "-p", "-f", tmpTar, "-C", mountPoint, "."); err != nil {
 			return
 		}
 	}
 
 	fsOut := filepath.Join(workdir, "output.fs")
-	if !run("mkfs.erofs", "-z", "lzma", "-C131072", "-Efragments,ztailpacking",
-		"-T0", "--all-time", "--ignore-mtime", "--tar=f", fsOut, tmpTar) {
+	if err = runCmd(cmdOut, "mkfs.erofs", "-z", "lzma", "-C131072", "-Efragments,ztailpacking",
+		"-T0", "--all-time", "--ignore-mtime", "--tar=f", fsOut, tmpTar); err != nil {
 		return
 	}
 
 	hashOut := filepath.Join(workdir, "output.hash")
 
-	if !run("veritysetup", "format", fsOut, hashOut) {
+	if err = runCmd(cmdOut, "veritysetup", "format", fsOut, hashOut); err != nil {
 		return
 	}
 
@@ -490,3 +477,15 @@ func fetchHostLayer(host *localconfig.Host, layer string) (path string, err erro
 
 	return distFetch("layers", layer, layerVersion)
 }
+
+func runCmd(cmdOut *bytes.Buffer, prog string, arg ...string) error {
+	cmdOut.Reset()
+
+	cmd := exec.Command(prog, arg...)
+	cmd.Stdout = cmdOut
+	cmd.Stderr = os.Stderr
+	if e := cmd.Run(); e != nil {
+		return fmt.Errorf("%s %q failed: %w", cmd.Path, cmd.Args, e)
+	}
+	return nil
+}