Add flag --build to wwctl container copy, default false

Signed-off-by: xu yang <xyang@ciq.com>

internal/app/wwctl/container/copy/main_test.go

@@ -0,0 +1,33 @@
+package copy
+
+import (
+	"path"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/warewulf/warewulf/internal/pkg/testenv"
+	"github.com/warewulf/warewulf/internal/pkg/warewulfd"
+)
+
+func Test_Copy(t *testing.T) {
+	env := testenv.New(t)
+	env.WriteFile(t, path.Join(testenv.WWChrootdir, "test-container/rootfs/bin/sh"), `test`)
+	defer env.RemoveAll(t)
+	warewulfd.SetNoDaemon()
+
+	t.Run("container copy without build", func(t *testing.T) {
+		baseCmd := GetCommand()
+		baseCmd.SetArgs([]string{"test-container", "test-container-copy-without-build"})
+		err := baseCmd.Execute()
+		assert.NoError(t, err)
+		assert.NoFileExists(t, path.Join(env.BaseDir, testenv.WWProvisiondir, "container", "test-container-copy-without-build.img"))
+	})
+
+	t.Run("container copy with build", func(t *testing.T) {
+		baseCmd := GetCommand()
+		baseCmd.SetArgs([]string{"-b", "test-container", "test-container-copy"})
+		err := baseCmd.Execute()
+		assert.NoError(t, err)
+		assert.FileExists(t, path.Join(env.BaseDir, testenv.WWProvisiondir, "container", "test-container-copy.img"))
+	})
+}