added test and reafctorred kernel.Build

Signed-off-by: Christian Goll <cgoll@suse.com>

internal/pkg/kernel/kernel_test.go

@@ -0,0 +1,66 @@
+package kernel
+
+import (
+	"os"
+	"path"
+	"testing"
+
+	warewulfconf "github.com/hpcng/warewulf/internal/pkg/config"
+	"github.com/hpcng/warewulf/internal/pkg/util"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"github.com/stretchr/testify/assert"
+)
+
+var kernelBuildTests = []struct {
+	kernelVersion  string
+	kernelName     string
+	kernelFileName string
+	succeed        bool
+}{
+	{"4.3.2.1", "kernel1", "vmlinuz-1.2.3.4.gz", false},
+	{"1.2.3.4", "kernel1", "vmlinuz-1.2.3.4.gz", true},
+}
+
+func Test_BuildKernel(t *testing.T) {
+	wwlog.SetLogLevel(wwlog.DEBUG)
+	srvDir, err := os.MkdirTemp(os.TempDir(), "ww-test-srv-*")
+	assert.NoError(t, err)
+	defer os.RemoveAll(srvDir)
+	conf := warewulfconf.Get()
+	conf.Paths.WWProvisiondir = srvDir
+	kernelDir, err := os.MkdirTemp(os.TempDir(), "ww-test-kernelImage-*")
+	assert.NoError(t, err)
+	defer os.RemoveAll(kernelDir)
+	{
+		err = os.MkdirAll(path.Join(kernelDir, "boot"), 0755)
+		assert.NoError(t, err)
+		for _, tt := range kernelBuildTests {
+			_, err = os.Create(path.Join(kernelDir, "boot", tt.kernelFileName))
+			assert.NoError(t, err)
+			err = os.MkdirAll(path.Join(kernelDir, "lib/modules", tt.kernelVersion), 0755)
+			assert.NoError(t, err)
+			_, err = os.Create(path.Join(kernelDir, "lib/modules", tt.kernelVersion, "test-module"))
+			assert.NoError(t, err)
+			err = os.MkdirAll(path.Join(kernelDir, "lib/firmware"), 0755)
+			assert.NoError(t, err)
+			_, err = os.Create(path.Join(kernelDir, "lib/firmware/test-firmware"))
+			assert.NoError(t, err)
+		}
+	}
+	for _, tt := range kernelBuildTests {
+		t.Run(tt.kernelName, func(t *testing.T) {
+			err = Build(tt.kernelVersion, tt.kernelName, kernelDir)
+			if tt.succeed {
+				assert.NoError(t, err)
+				assert.FileExists(t, path.Join(srvDir, "kernel", tt.kernelName, "vmlinuz"))
+				assert.FileExists(t, path.Join(srvDir, "kernel", tt.kernelName, "kmods.img.gz"))
+				assert.FileExists(t, path.Join(srvDir, "kernel", tt.kernelName, "kmods.img"))
+				files, err := util.CpioFiles(path.Join(srvDir, "kernel", tt.kernelName, "kmods.img"))
+				assert.NoError(t, err)
+				assert.Equal(t, files, []string{"lib/firmware/test-firmware", "lib/modules/1.2.3.4/test-module"})
+			} else {
+				assert.Error(t, err)
+			}
+		})
+	}
+}