fix zip extraction without file entries (#712)

* renaming some testdata archives for symmetry
* adding new test archive (non-flat zip, without dir entry)

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

Author: ahmetb

internal/download/downloader.go

@@ -70,6 +70,11 @@ func extractZIP(targetDir string, read io.ReaderAt, size int64) error {
 			continue
 		}
 
+		dir := filepath.Dir(path)
+		klog.V(4).Infof("zip: ensuring parent dirs exist for regular file, dir=%s", dir)
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			return errors.Wrap(err, "failed to create directory for zip entry")
+		}
 		src, err := f.Open()
 		if err != nil {
 			return errors.Wrap(err, "could not open inflating zip file")

internal/download/downloader_test.go

@@ -46,16 +46,23 @@ func Test_extractZIP(t *testing.T) {
 		files []string
 	}{
 		{
-			in: "test-with-directory.zip",
+			in: "test-flat-hierarchy.zip",
+			files: []string{
+				"/foo",
+			},
+		},
+		{
+			in: "test-with-directory-entry.zip",
 			files: []string{
 				"/test/",
 				"/test/foo",
 			},
 		},
 		{
-			in: "test-without-directory.zip",
+			in: "test-with-no-directory-entry.zip",
 			files: []string{
-				"/foo",
+				"/test/",
+				"/test/foo",
 			},
 		},
 	}
@@ -88,18 +95,18 @@ func Test_extractTARGZ(t *testing.T) {
 		files []string
 	}{
 		{
-			in:    "test-without-directory.tar.gz",
+			in:    "test-flat-hierarchy.tar.gz",
 			files: []string{"/foo"},
 		},
 		{
-			in: "test-with-nesting-with-directory-entries.tar.gz",
+			in: "test-with-directory-entry.tar.gz",
 			files: []string{
 				"/test/",
 				"/test/foo",
 			},
 		},
 		{
-			in: "test-with-nesting-without-directory-entries.tar.gz",
+			in: "test-with-no-directory-entry.tar.gz",
 			files: []string{
 				"/test/",
 				"/test/foo",
@@ -173,9 +180,9 @@ func TestDownloader_Get(t *testing.T) {
 			name: "successful get",
 			fields: fields{
 				verifier: newTrueVerifier(),
-				fetcher:  NewFileFetcher(filepath.Join(testdataPath(), "test-with-directory.zip")),
+				fetcher:  NewFileFetcher(filepath.Join(testdataPath(), "test-with-directory-entry.zip")),
 			},
-			uri:     "foo/bar/test-with-directory.zip",
+			uri:     "foo/bar/test-with-directory-entry.zip",
 			wantErr: false,
 		},
 		{
@@ -184,7 +191,7 @@ func TestDownloader_Get(t *testing.T) {
 				verifier: newTrueVerifier(),
 				fetcher:  errorFetcher{},
 			},
-			uri:     "foo/bar/test-with-directory.zip",
+			uri:     "foo/bar/test-with-directory-entry.zip",
 			wantErr: true,
 		},
 	}
@@ -201,7 +208,7 @@ func TestDownloader_Get(t *testing.T) {
 }
 
 func Test_download(t *testing.T) {
-	filePath := filepath.Join(testdataPath(), "test-with-directory.zip")
+	filePath := filepath.Join(testdataPath(), "test-with-directory-entry.zip")
 	downloadOriginal, err := ioutil.ReadFile(filePath)
 	if err != nil {
 		t.Fatal(err)
@@ -302,15 +309,15 @@ func Test_detectMIMEType(t *testing.T) {
 		{
 			name: "type zip",
 			args: args{
-				file: filepath.Join(testdataPath(), "test-with-directory.zip"),
+				file: filepath.Join(testdataPath(), "test-with-directory-entry.zip"),
 			},
 			want:    "application/zip",
 			wantErr: false,
 		},
 		{
 			name: "type tar.gz",
 			args: args{
-				file: filepath.Join(testdataPath(), "test-with-nesting-with-directory-entries.tar.gz"),
+				file: filepath.Join(testdataPath(), "test-with-directory-entry.tar.gz"),
 			},
 			want:    "application/x-gzip",
 			wantErr: false,
@@ -434,7 +441,7 @@ func Test_extractArchive(t *testing.T) {
 			args: args{
 				filename: "",
 				dst:      "",
-				file:     filepath.Join(testdataPath(), "test-with-nesting-with-directory-entries.tar.gz"),
+				file:     filepath.Join(testdataPath(), "test-with-directory-entry.tar.gz"),
 			},
 			wantErr: true,
 		},

internal/download/testdata/test-without-directory.tar.gz renamed to internal/download/testdata/test-flat-hierarchy.tar.gz

@@ -223,7 +223,7 @@ func Test_downloadAndExtract(t *testing.T) {
 	server := httptest.NewServer(http.FileServer(http.Dir(testdataDir)))
 	defer server.Close()
 
-	url := server.URL + "/test-without-directory.tar.gz"
+	url := server.URL + "/test-flat-hierarchy.tar.gz"
 	checksum := "433b9e0b6cb9f064548f451150799daadcc70a3496953490c5148c8e550d2f4e"
 
 	if err := downloadAndExtract(tmpDir.Root(), url, checksum, ""); err != nil {
@@ -241,7 +241,7 @@ func Test_downloadAndExtract(t *testing.T) {
 func Test_downloadAndExtract_fileOverride(t *testing.T) {
 	tmpDir := testutil.NewTempDir(t)
 
-	testFile := filepath.Join(testdataPath(t), "..", "..", "download", "testdata", "test-without-directory.tar.gz")
+	testFile := filepath.Join(testdataPath(t), "..", "..", "download", "testdata", "test-flat-hierarchy.tar.gz")
 	checksum := "433b9e0b6cb9f064548f451150799daadcc70a3496953490c5148c8e550d2f4e"
 
 	if err := downloadAndExtract(tmpDir.Root(), "", checksum, testFile); err != nil {