Move truncate to native golang

Author: c4rt0

mantle/kola/tests/ignition/qemufailure.go

@@ -41,12 +41,9 @@ func init() {
 		Tags:        []string{"ignition"},
 	})
 	register.RegisterTest(&register.Test{
-		Name:        "coreos.ignition.uniquebootfs",
-		Description: "Verify there is only one bootfs.",
+		Name:        "coreos.unique.boot.failure",
+		Description: "Verify boot fails if there are multiple boot filesystems.",
 		Run:         runBootfsFailure,
-		ClusterSize: 0,
-		Platforms:   []string{"qemu"},
-		Tags:        []string{"ignition"},
 	})
 }
 
@@ -119,51 +116,50 @@ func ignitionFailure(c cluster.TestCluster) error {
 	}
 }
 
-// get current path and create tmp dir
-func GetTempdir(dirname string) (string, error) {
+func bootfsFailure(c cluster.TestCluster) error {
+	// Create fakeboot disk
+	fakeConfig, err := conf.EmptyIgnition().Render(conf.FailWarnings)
+	if err != nil {
+		return errors.Wrapf(err, "creating empty config")
+	}
+	// get current path and create tmp dir
+	dirname := "tmp"
 	dir, err := os.Getwd()
 	if err != nil {
-		return "", err
+		return err
 	}
-	path := filepath.Join(dir, dirname)
-	return path, nil
-}
-
-func bootfsFailure(c cluster.TestCluster) error {
-	// We can't create files in / due to the immutable bit OSTree creates, so
-	// this is a convenient way to test Ignition failure.
-
-	failConfig, err := conf.EmptyIgnition().Render(conf.FailWarnings)
+	tempDir := filepath.Join(dir, dirname)
+	// Change the current working directory
+	if err := os.Chdir(tempDir); err != nil {
+		return err
+	}
+	bootName := "fakeboot"
+	createBoot, err := os.Create(bootName)
 	if err != nil {
-		return errors.Wrapf(err, "creating empty config")
+		return err
 	}
-
-	// Config which theoretically aims to reference fakeboot disk
-	fakeConfig, err := conf.EmptyIgnition().Render(conf.FailWarnings)
+	// Truncate the file to 1 gigabyte
+	// 1<<30 is a way to represent 1gb in terms of bytes
+	// (bitwise left shift operation)
+	const oneGB = 1 << 30
+	err = os.Truncate(createBoot.Name(), oneGB)
 	if err != nil {
-		return errors.Wrapf(err, "creating empty config")
-	} else {
-
-		tempDir, err := GetTempdir("tmp")
-		if err != nil {
-			fmt.Println("Error getting temp directory:", err)
-		}
-		fmt.Println("Temp directory:", tempDir)
-		cmd := exec.Command("/bin/bash", "-c", fmt.Sprintf(`set -euo pipefail;
-				mkdir -p %s
-				truncate -s 1G fakeboot
-				mkfs.ext4 -L boot fakeboot
-			`, tempDir))
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-		if err := cmd.Run(); err != nil {
-			c.Fatal(err)
-		}
+		return err
+	}
+	cmd := exec.Command("mkfs.ext4", "-L", "boot", createBoot.Name())
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		c.Fatal(err)
 	}
 
 	builder := platform.NewQemuBuilder()
 	defer builder.Close()
-	builder.SetConfig(failConfig)
+	builder.SetConfig(fakeConfig)
+	builder.AddDisk(&platform.Disk{
+		BackingFile:   tempDir,
+		BackingFormat: "raw",
+	})
 	err = builder.AddBootDisk(&platform.Disk{
 		BackingFile: kola.QEMUOptions.DiskImage,
 	})
@@ -179,24 +175,6 @@ func bootfsFailure(c cluster.TestCluster) error {
 	}
 	defer inst.Destroy()
 
-	builder2 := platform.NewQemuBuilder()
-	defer builder2.Close()
-	builder2.SetConfig(fakeConfig) // how to fakeboot?
-	err = builder2.AddDisk(&platform.Disk{
-		BackingFile: kola.QEMUOptions.DiskImage,
-	})
-
-	if err != nil {
-		return err
-	}
-	builder2.MemoryMiB = 1024
-	builder2.Firmware = kola.QEMUOptions.Firmware
-	inst2, err := builder2.Exec()
-	if err != nil {
-		return err
-	}
-	defer inst2.Destroy()
-
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
 	defer cancel()