swupd/archive: add more test coverage

Brings test coverage for archive.go up to >80%

Signed-off-by: Matthew Johnson <matthew.johnson@intel.com>

swupd/archive_test.go

@@ -0,0 +1,115 @@
+package swupd
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestNewCompressedTarReaderUncompressedRegularFile(t *testing.T) {
+	testCases := []string{
+		"/etc/protocols",
+		"/usr/share/defaults/etc/protocols",
+		"/usr/share/doc/systemd/LICENSE.GPL2",
+	}
+	for _, tc := range testCases {
+		var f *os.File
+		var err error
+		if f, err = os.Open(tc); err != nil {
+			// not checking non-existent files
+			// not testing the os.Open call
+			continue
+		}
+		defer func() {
+			_ = f.Close()
+		}()
+		_, err = NewCompressedTarReader(f)
+		if err != nil {
+			t.Errorf("NewCompressedTarReader returned error %v for uncompressed regular file %s",
+				err, tc)
+		}
+	}
+}
+
+func TestNewCompressedTarReaderBzip2(t *testing.T) {
+	// create origin uncompressed file
+	f, err := ioutil.TempFile("", "bzip2test")
+	if err != nil {
+		t.Fatalf("couldn't create test file")
+	}
+	defer func() {
+		_ = f.Close()
+		_ = os.Remove(f.Name())
+	}()
+	// write data to test file
+	if _, err = f.Write([]byte("testdata\ntestmoredata")); err != nil {
+		t.Fatalf("couldn't write to test file")
+	}
+
+	// need unique name for tar file, so create now
+	tarf, err := ioutil.TempFile("", "bzip2testtar*.tar")
+	if err != nil {
+		t.Fatalf("couldn't create test tar")
+	}
+	defer func() {
+		_ = tarf.Close()
+		_ = os.Remove(tarf.Name())
+	}()
+
+	// tarRegularFullfile needs a FileInfo on the origin file
+	fi, err := os.Lstat(f.Name())
+	if err != nil {
+		t.Fatalf("couldn't get file info for test file: %s", err)
+	}
+
+	// tar the origin file, result is an uncompressed tar archive
+	if err = tarRegularFullfile(tarf, f.Name(), filepath.Base(tarf.Name()), fi); err != nil {
+		t.Fatalf("unable to tar a regular fullfile for test: %s", err)
+	}
+
+	// create the output compressed tar file
+	out, err := ioutil.TempFile("", "bzip2testCompressed*.tar")
+	if err != nil {
+		t.Fatalf("Couldn't create test compressed tarfile")
+	}
+	defer func() {
+		_ = out.Close()
+		_ = os.Remove(out.Name())
+	}()
+
+	// select external-bzip2 compressor
+	var compressor compressFunc
+	for _, fc := range fullfileCompressors {
+		if fc.Name == "external-bzip2" {
+			compressor = fc.Func
+			break
+		}
+	}
+	if compressor == nil {
+		t.Fatalf("unable to find bzip2 compression function")
+	}
+
+	// compress using bzip2
+	if err := compressor(out, f); err != nil {
+		t.Fatalf("failed to compress %s using bzip2", f.Name())
+	}
+
+	// need to seek back to the beginning to uncompress
+	if _, err := out.Seek(0, io.SeekStart); err != nil {
+		t.Fatalf("unable to seek to start of fullfile")
+	}
+
+	// test NewCompressedTarReader
+	if _, err := NewCompressedTarReader(out); err != nil {
+		t.Errorf("NewCompressedTarReader unable to uncompress bzip2 file: %s", err)
+	}
+}
+
+func TestCompressedTarReaderCloseNil(t *testing.T) {
+	ctr := CompressedTarReader{}
+	if ctr.Close() != nil {
+		t.Error("expected nil return with undefined close")
+	}
+}