From 1a0f20777f85a6511dc538d6a2f555f3e77ddf0a Mon Sep 17 00:00:00 2001
From: Vasily Ovchinnikov <vasily@remerge.io>
Date: Wed, 31 Mar 2021 13:55:22 +0200
Subject: [PATCH] Add GCS Fs implementation

---
 gcs-fake-service-account.json |   9 +
 gcs.go                        | 113 ++++++
 gcs_mocks.go                  | 255 ++++++++++++++
 gcs_test.go                   | 626 ++++++++++++++++++++++++++++++++++
 gcsfs/errors.go               |  30 ++
 gcsfs/file.go                 | 305 +++++++++++++++++
 gcsfs/file_info.go            | 137 ++++++++
 gcsfs/file_resource.go        | 271 +++++++++++++++
 gcsfs/fs.go                   | 344 +++++++++++++++++++
 go.mod                        |   8 +-
 go.sum                        | 442 +++++++++++++++++++++++-
 11 files changed, 2532 insertions(+), 8 deletions(-)
 create mode 100644 gcs-fake-service-account.json
 create mode 100644 gcs.go
 create mode 100644 gcs_mocks.go
 create mode 100644 gcs_test.go
 create mode 100644 gcsfs/errors.go
 create mode 100644 gcsfs/file.go
 create mode 100644 gcsfs/file_info.go
 create mode 100644 gcsfs/file_resource.go
 create mode 100644 gcsfs/fs.go

diff --git a/gcs-fake-service-account.json b/gcs-fake-service-account.json
new file mode 100644
index 0000000..95ca5ab
--- /dev/null
+++ b/gcs-fake-service-account.json
@@ -0,0 +1,9 @@
+{
+  "type": "service_account",
+  "private_key_id": "abc",
+  "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDY3E8o1NEFcjMM\nHW/5ZfFJw29/8NEqpViNjQIx95Xx5KDtJ+nWn9+OW0uqsSqKlKGhAdAo+Q6bjx2c\nuXVsXTu7XrZUY5Kltvj94DvUa1wjNXs606r/RxWTJ58bfdC+gLLxBfGnB6CwK0YQ\nxnfpjNbkUfVVzO0MQD7UP0Hl5ZcY0Puvxd/yHuONQn/rIAieTHH1pqgW+zrH/y3c\n59IGThC9PPtugI9ea8RSnVj3PWz1bX2UkCDpy9IRh9LzJLaYYX9RUd7++dULUlat\nAaXBh1U6emUDzhrIsgApjDVtimOPbmQWmX1S60mqQikRpVYZ8u+NDD+LNw+/Eovn\nxCj2Y3z1AgMBAAECggEAWDBzoqO1IvVXjBA2lqId10T6hXmN3j1ifyH+aAqK+FVl\nGjyWjDj0xWQcJ9ync7bQ6fSeTeNGzP0M6kzDU1+w6FgyZqwdmXWI2VmEizRjwk+/\n/uLQUcL7I55Dxn7KUoZs/rZPmQDxmGLoue60Gg6z3yLzVcKiDc7cnhzhdBgDc8vd\nQorNAlqGPRnm3EqKQ6VQp6fyQmCAxrr45kspRXNLddat3AMsuqImDkqGKBmF3Q1y\nxWGe81LphUiRqvqbyUlh6cdSZ8pLBpc9m0c3qWPKs9paqBIvgUPlvOZMqec6x4S6\nChbdkkTRLnbsRr0Yg/nDeEPlkhRBhasXpxpMUBgPywKBgQDs2axNkFjbU94uXvd5\nznUhDVxPFBuxyUHtsJNqW4p/ujLNimGet5E/YthCnQeC2P3Ym7c3fiz68amM6hiA\nOnW7HYPZ+jKFnefpAtjyOOs46AkftEg07T9XjwWNPt8+8l0DYawPoJgbM5iE0L2O\nx8TU1Vs4mXc+ql9F90GzI0x3VwKBgQDqZOOqWw3hTnNT07Ixqnmd3dugV9S7eW6o\nU9OoUgJB4rYTpG+yFqNqbRT8bkx37iKBMEReppqonOqGm4wtuRR6LSLlgcIU9Iwx\nyfH12UWqVmFSHsgZFqM/cK3wGev38h1WBIOx3/djKn7BdlKVh8kWyx6uC8bmV+E6\nOoK0vJD6kwKBgHAySOnROBZlqzkiKW8c+uU2VATtzJSydrWm0J4wUPJifNBa/hVW\ndcqmAzXC9xznt5AVa3wxHBOfyKaE+ig8CSsjNyNZ3vbmr0X04FoV1m91k2TeXNod\njMTobkPThaNm4eLJMN2SQJuaHGTGERWC0l3T18t+/zrDMDCPiSLX1NAvAoGBAN1T\nVLJYdjvIMxf1bm59VYcepbK7HLHFkRq6xMJMZbtG0ryraZjUzYvB4q4VjHk2UDiC\nlhx13tXWDZH7MJtABzjyg+AI7XWSEQs2cBXACos0M4Myc6lU+eL+iA+OuoUOhmrh\nqmT8YYGu76/IBWUSqWuvcpHPpwl7871i4Ga/I3qnAoGBANNkKAcMoeAbJQK7a/Rn\nwPEJB+dPgNDIaboAsh1nZhVhN5cvdvCWuEYgOGCPQLYQF0zmTLcM+sVxOYgfy8mV\nfbNgPgsP5xmu6dw2COBKdtozw0HrWSRjACd1N4yGu75+wPCcX/gQarcjRcXXZeEa\nNtBLSfcqPULqD+h7br9lEJio\n-----END PRIVATE KEY-----\n",
+  "client_email": "123-abc@developer.gserviceaccount.com",
+  "client_id": "123-abc.apps.googleusercontent.com",
+  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+  "token_uri": "http://localhost:8080/token"
+}
diff --git a/gcs.go b/gcs.go
new file mode 100644
index 0000000..a978735
--- /dev/null
+++ b/gcs.go
@@ -0,0 +1,113 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp
+// licensed under Apache License 2.0.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package afero
+
+import (
+	"context"
+	"os"
+	"time"
+
+	"cloud.google.com/go/storage"
+	"github.com/googleapis/google-cloud-go-testing/storage/stiface"
+	"github.com/spf13/afero/gcsfs"
+	"google.golang.org/api/option"
+)
+
+type GcsFs struct {
+	source *gcsfs.GcsFs
+}
+
+// Creates a GCS file system, automatically instantiating and decorating the storage client.
+// You can provide additional options to be passed to the client creation, as per
+// cloud.google.com/go/storage documentation
+func NewGcsFS(ctx context.Context, bucketName string, opts ...option.ClientOption) (Fs, error) {
+	client, err := storage.NewClient(ctx, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewGcsFSFromClient(ctx, client, bucketName)
+}
+
+// The same as NewGcsFS, but the files system will use the provided folder separator.
+func NewGcsFSWithSeparator(ctx context.Context, bucketName, folderSeparator string, opts ...option.ClientOption) (Fs, error) {
+	client, err := storage.NewClient(ctx, opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewGcsFSFromClientWithSeparator(ctx, client, bucketName, folderSeparator)
+}
+
+// Creates a GCS file system from a given storage client
+func NewGcsFSFromClient(ctx context.Context, client *storage.Client, bucketName string) (Fs, error) {
+	c := stiface.AdaptClient(client)
+
+	bucket := c.Bucket(bucketName)
+
+	return &GcsFs{gcsfs.NewGcsFs(ctx, bucket)}, nil
+}
+
+// Same as NewGcsFSFromClient, but the file system will use the provided folder separator.
+func NewGcsFSFromClientWithSeparator(ctx context.Context, client *storage.Client, bucketName, folderSeparator string) (Fs, error) {
+	c := stiface.AdaptClient(client)
+
+	bucket := c.Bucket(bucketName)
+
+	return &GcsFs{gcsfs.NewGcsFsWithSeparator(ctx, bucket, folderSeparator)}, nil
+}
+
+// Wraps gcs.GcsFs and convert some return types to afero interfaces.
+func (fs *GcsFs) Name() string {
+	return fs.source.Name()
+}
+func (fs *GcsFs) Create(name string) (File, error) {
+	return fs.source.Create(name)
+}
+func (fs *GcsFs) Mkdir(name string, perm os.FileMode) error {
+	return fs.source.Mkdir(name, perm)
+}
+func (fs *GcsFs) MkdirAll(path string, perm os.FileMode) error {
+	return fs.source.MkdirAll(path, perm)
+}
+func (fs *GcsFs) Open(name string) (File, error) {
+	return fs.source.Open(name)
+}
+func (fs *GcsFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
+	return fs.source.OpenFile(name, flag, perm)
+}
+func (fs *GcsFs) Remove(name string) error {
+	return fs.source.Remove(name)
+}
+func (fs *GcsFs) RemoveAll(path string) error {
+	return fs.source.RemoveAll(path)
+}
+func (fs *GcsFs) Rename(oldname, newname string) error {
+	return fs.source.Rename(oldname, newname)
+}
+func (fs *GcsFs) Stat(name string) (os.FileInfo, error) {
+	return fs.source.Stat(name)
+}
+func (fs *GcsFs) Chmod(name string, mode os.FileMode) error {
+	return fs.source.Chmod(name, mode)
+}
+func (fs *GcsFs) Chtimes(name string, atime time.Time, mtime time.Time) error {
+	return fs.source.Chtimes(name, atime, mtime)
+}
+func (fs *GcsFs) Chown(name string, uid, gid int) error {
+	return fs.source.Chown(name, uid, gid)
+}
diff --git a/gcs_mocks.go b/gcs_mocks.go
new file mode 100644
index 0000000..2d6928e
--- /dev/null
+++ b/gcs_mocks.go
@@ -0,0 +1,255 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// A set of stiface-based mocks, replicating the GCS behavior, to make the tests not require any
+// internet connection or real buckets.
+// It is **not** a comprehensive set of mocks to test anything and everything GCS-related, rather
+// a very tailored one for the current implementation - thus the tests, written with the use of
+// these mocks are more of regression ones.
+// If any GCS behavior changes and breaks the implementation, then it should first be adjusted by
+// switching over to a real bucket - and then the mocks have to be adjusted to match the
+// implementation.
+
+package afero
+
+import (
+	"context"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/spf13/afero/gcsfs"
+
+	"cloud.google.com/go/storage"
+	"github.com/googleapis/google-cloud-go-testing/storage/stiface"
+	"google.golang.org/api/iterator"
+)
+
+// sets filesystem separators to the one, expected (and hard-coded) in the tests
+func normSeparators(s string) string {
+	return strings.Replace(s, "\\", "/", -1)
+}
+
+type clientMock struct {
+	stiface.Client
+	fs Fs
+}
+
+func newClientMock() *clientMock {
+	return &clientMock{fs: NewMemMapFs()}
+}
+
+func (m *clientMock) Bucket(name string) stiface.BucketHandle {
+	return &bucketMock{bucketName: name, fs: m.fs}
+}
+
+type bucketMock struct {
+	stiface.BucketHandle
+
+	bucketName string
+
+	fs Fs
+}
+
+func (m *bucketMock) Object(name string) stiface.ObjectHandle {
+	return &objectMock{name: name, fs: m.fs}
+}
+
+func (m *bucketMock) Objects(_ context.Context, q *storage.Query) (it stiface.ObjectIterator) {
+	return &objectItMock{name: q.Prefix, fs: m.fs}
+}
+
+type objectMock struct {
+	stiface.ObjectHandle
+
+	name string
+	fs   Fs
+}
+
+func (o *objectMock) NewWriter(_ context.Context) stiface.Writer {
+	return &writerMock{name: o.name, fs: o.fs}
+}
+
+func (o *objectMock) NewRangeReader(_ context.Context, offset, length int64) (stiface.Reader, error) {
+	if o.name == "" {
+		return nil, gcsfs.ErrEmptyObjectName
+	}
+
+	file, err := o.fs.Open(o.name)
+	if err != nil {
+		return nil, err
+	}
+
+	if offset > 0 {
+		_, err = file.Seek(offset, io.SeekStart)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	res := &readerMock{file: file}
+	if length > -1 {
+		res.buf = make([]byte, length)
+		_, err = file.Read(res.buf)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return res, nil
+}
+
+func (o *objectMock) Delete(_ context.Context) error {
+	if o.name == "" {
+		return gcsfs.ErrEmptyObjectName
+	}
+	return o.fs.Remove(o.name)
+}
+
+func (o *objectMock) Attrs(_ context.Context) (*storage.ObjectAttrs, error) {
+	if o.name == "" {
+		return nil, gcsfs.ErrEmptyObjectName
+	}
+
+	info, err := o.fs.Stat(o.name)
+	if err != nil {
+		pathError, ok := err.(*os.PathError)
+		if ok {
+			if pathError.Err == os.ErrNotExist {
+				return nil, storage.ErrObjectNotExist
+			}
+		}
+
+		return nil, err
+	}
+
+	res := &storage.ObjectAttrs{Name: normSeparators(o.name), Size: info.Size(), Updated: info.ModTime()}
+
+	if info.IsDir() {
+		// we have to mock it here, because of FileInfo logic
+		return nil, gcsfs.ErrObjectDoesNotExist
+	}
+
+	return res, nil
+}
+
+type writerMock struct {
+	stiface.Writer
+
+	name string
+	fs   Fs
+
+	file File
+}
+
+func (w *writerMock) Write(p []byte) (n int, err error) {
+	if w.file == nil {
+		w.file, err = w.fs.Create(w.name)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	return w.file.Write(p)
+}
+
+func (w *writerMock) Close() error {
+	if w.file == nil {
+		var err error
+		if strings.HasSuffix(w.name, "/") {
+			err = w.fs.Mkdir(w.name, 0755)
+			if err != nil {
+				return err
+			}
+		} else {
+			_, err = w.Write([]byte{})
+			if err != nil {
+				return err
+			}
+		}
+	}
+	if w.file != nil {
+		return w.file.Close()
+	}
+	return nil
+}
+
+type readerMock struct {
+	stiface.Reader
+
+	file File
+
+	buf []byte
+}
+
+func (r *readerMock) Remain() int64 {
+	return 0
+}
+
+func (r *readerMock) Read(p []byte) (int, error) {
+	if r.buf != nil {
+		copy(p, r.buf)
+		return len(r.buf), nil
+	}
+	return r.file.Read(p)
+}
+
+type objectItMock struct {
+	stiface.ObjectIterator
+
+	name string
+	fs   Fs
+
+	dir   File
+	infos []*storage.ObjectAttrs
+}
+
+func (it *objectItMock) Next() (*storage.ObjectAttrs, error) {
+	var err error
+	if it.dir == nil {
+		it.dir, err = it.fs.Open(it.name)
+		if err != nil {
+			return nil, err
+		}
+
+		var isDir bool
+		isDir, err = IsDir(it.fs, it.name)
+		if err != nil {
+			return nil, err
+		}
+
+		it.infos = []*storage.ObjectAttrs{}
+
+		if !isDir {
+			var info os.FileInfo
+			info, err = it.dir.Stat()
+			if err != nil {
+				return nil, err
+			}
+			it.infos = append(it.infos, &storage.ObjectAttrs{Name: normSeparators(info.Name()), Size: info.Size(), Updated: info.ModTime()})
+		} else {
+			var fInfos []os.FileInfo
+			fInfos, err = it.dir.Readdir(0)
+			if err != nil {
+				return nil, err
+			}
+			if it.name != "" {
+				it.infos = append(it.infos, &storage.ObjectAttrs{
+					Prefix: normSeparators(it.name) + "/",
+				})
+			}
+
+			for _, info := range fInfos {
+				it.infos = append(it.infos, &storage.ObjectAttrs{Name: normSeparators(info.Name()), Size: info.Size(), Updated: info.ModTime()})
+			}
+		}
+	}
+
+	if len(it.infos) == 0 {
+		return nil, iterator.Done
+	}
+
+	res := it.infos[0]
+	it.infos = it.infos[1:]
+
+	return res, err
+}
diff --git a/gcs_test.go b/gcs_test.go
new file mode 100644
index 0000000..3b701e1
--- /dev/null
+++ b/gcs_test.go
@@ -0,0 +1,626 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// Most of the tests are "derived" from the Afero's own tarfs implementation.
+// Write-oriented tests and/or checks have been added on top of that
+
+package afero
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"syscall"
+	"testing"
+
+	"github.com/spf13/afero/gcsfs"
+
+	"cloud.google.com/go/storage"
+	"github.com/googleapis/google-cloud-go-testing/storage/stiface"
+)
+
+const (
+	testBytes = 8
+	dirSize   = 42
+)
+
+var files = []struct {
+	name            string
+	exists          bool
+	isdir           bool
+	size            int64
+	content         string
+	offset          int64
+	contentAtOffset string
+}{
+	{"", true, true, dirSize, "", 0, ""}, // this is NOT a valid path for GCS, so we do some magic here
+	{"sub", true, true, dirSize, "", 0, ""},
+	{"sub/testDir2", true, true, dirSize, "", 0, ""},
+	{"sub/testDir2/testFile", true, false, 8 * 1024, "c", 4 * 1024, "d"},
+	{"testFile", true, false, 12 * 1024, "a", 7 * 1024, "b"},
+	{"testDir1/testFile", true, false, 3 * 512, "b", 512, "c"},
+
+	{"nonExisting", false, false, dirSize, "", 0, ""},
+}
+
+var dirs = []struct {
+	name     string
+	children []string
+}{
+	{"", []string{"sub", "testDir1", "testFile"}},
+	{"sub", []string{"testDir2"}},
+	{"sub/testDir2", []string{"testFile"}},
+	{"testDir1", []string{"testFile"}},
+}
+
+var gcsAfs *Afero
+
+func TestMain(m *testing.M) {
+	ctx := context.Background()
+	var err error
+
+	// Check if GOOGLE_APPLICATION_CREDENTIALS are present. If not, then a fake service account
+	// would be used: https://github.com/google/oauth2l/blob/master/integration/fixtures/fake-service-account.json
+	if os.Getenv("GOOGLE_APPLICATION_CREDENTIALS") == "" {
+		var fakeCredentialsAbsPath string
+		fakeCredentialsAbsPath, err = filepath.Abs("gcs-fake-service-account.json")
+		if err != nil {
+			fmt.Print(err)
+			os.Exit(1)
+		}
+
+		err = os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", fakeCredentialsAbsPath)
+		if err != nil {
+			fmt.Print(err)
+			os.Exit(1)
+		}
+
+		// reset it after the run
+		defer func() {
+			err = os.Remove("GOOGLE_APPLICATION_CREDENTIALS")
+			if err != nil {
+				// it's worth printing it out explicitly, since it might have implications further down the road
+				fmt.Print("failed to clear fake GOOGLE_APPLICATION_CREDENTIALS", err)
+			}
+		}()
+	}
+
+	var c *storage.Client
+	c, err = storage.NewClient(ctx)
+	if err != nil {
+		fmt.Print(err)
+		os.Exit(1)
+	}
+	client := stiface.AdaptClient(c)
+
+	// This block is mocking the client for the sake of isolated testing
+	mockClient := newClientMock()
+	mockClient.Client = client
+
+	bucket := mockClient.Bucket("a-test-bucket")
+
+	// If you want to run the test suite on a LIVE bucket, comment the previous
+	// block and uncomment the line below and put your bucket name there.
+	// Keep in mind, that GCS will likely rate limit you, so it would be impossible
+	// to run the entire suite at once, only test by test.
+	//bucket := client.Bucket("a-test-bucket")
+
+	gcsAfs = &Afero{Fs: &GcsFs{gcsfs.NewGcsFs(ctx, bucket)}}
+
+	// defer here to assure our Env cleanup happens, if the mock was used
+	defer os.Exit(m.Run())
+}
+
+func createFiles(t *testing.T) {
+	t.Helper()
+	var err error
+
+	// the files have to be created first
+	for _, f := range files {
+		if !f.isdir && f.exists {
+			var freshFile File
+			freshFile, err = gcsAfs.Create(f.name)
+			if err != nil {
+				t.Fatalf("failed to create a file \"%s\": %s", f.name, err)
+			}
+
+			var written int
+			var totalWritten int64
+			for totalWritten < f.size {
+				if totalWritten < f.offset {
+					writeBuf := []byte(strings.Repeat(f.content, int(f.offset)))
+					written, err = freshFile.WriteAt(writeBuf, totalWritten)
+				} else {
+					writeBuf := []byte(strings.Repeat(f.contentAtOffset, int(f.size-f.offset)))
+					written, err = freshFile.WriteAt(writeBuf, totalWritten)
+				}
+				if err != nil {
+					t.Fatalf("failed to write a file \"%s\": %s", f.name, err)
+				}
+
+				totalWritten += int64(written)
+			}
+
+			err = freshFile.Close()
+			if err != nil {
+				t.Fatalf("failed to close a file \"%s\": %s", f.name, err)
+			}
+		}
+	}
+}
+
+func removeFiles(t *testing.T) {
+	t.Helper()
+	var err error
+
+	// the files have to be created first
+	for _, f := range files {
+		if !f.isdir && f.exists {
+			err = gcsAfs.Remove(f.name)
+			if err != nil && err == syscall.ENOENT {
+				t.Errorf("failed to remove file \"%s\": %s", f.name, err)
+			}
+		}
+	}
+}
+
+func TestFsOpen(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		file, err := gcsAfs.Open(f.name)
+		if (err == nil) != f.exists {
+			t.Errorf("%v exists = %v, but got err = %v", f.name, f.exists, err)
+		}
+
+		if !f.exists {
+			continue
+		}
+		if err != nil {
+			t.Fatalf("%v: %v", f.name, err)
+		}
+
+		if file.Name() != filepath.FromSlash(f.name) {
+			t.Errorf("Name(), got %v, expected %v", file.Name(), filepath.FromSlash(f.name))
+		}
+
+		s, err := file.Stat()
+		if err != nil {
+			t.Fatalf("stat %v: got error '%v'", file.Name(), err)
+		}
+
+		if isdir := s.IsDir(); isdir != f.isdir {
+			t.Errorf("%v directory, got: %v, expected: %v", file.Name(), isdir, f.isdir)
+		}
+
+		if size := s.Size(); size != f.size {
+			t.Errorf("%v size, got: %v, expected: %v", file.Name(), size, f.size)
+		}
+	}
+}
+
+func TestRead(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		if !f.exists {
+			continue
+		}
+
+		file, err := gcsAfs.Open(f.name)
+		if err != nil {
+			t.Fatalf("opening %v: %v", f.name, err)
+		}
+
+		buf := make([]byte, 8)
+		n, err := file.Read(buf)
+		if err != nil {
+			if f.isdir && (err != syscall.EISDIR) {
+				t.Errorf("%v got error %v, expected EISDIR", f.name, err)
+			} else if !f.isdir {
+				t.Errorf("%v: %v", f.name, err)
+			}
+		} else if n != 8 {
+			t.Errorf("%v: got %d read bytes, expected 8", f.name, n)
+		} else if string(buf) != strings.Repeat(f.content, testBytes) {
+			t.Errorf("%v: got <%s>, expected <%s>", f.name, f.content, string(buf))
+		}
+
+	}
+}
+
+func TestGcsReadAt(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		if !f.exists {
+			continue
+		}
+
+		file, err := gcsAfs.Open(f.name)
+		if err != nil {
+			t.Fatalf("opening %v: %v", f.name, err)
+		}
+
+		buf := make([]byte, testBytes)
+		n, err := file.ReadAt(buf, f.offset-testBytes/2)
+		if err != nil {
+			if f.isdir && (err != syscall.EISDIR) {
+				t.Errorf("%v got error %v, expected EISDIR", f.name, err)
+			} else if !f.isdir {
+				t.Errorf("%v: %v", f.name, err)
+			}
+		} else if n != 8 {
+			t.Errorf("%v: got %d read bytes, expected 8", f.name, n)
+		} else if string(buf) != strings.Repeat(f.content, testBytes/2)+strings.Repeat(f.contentAtOffset, testBytes/2) {
+			t.Errorf("%v: got <%s>, expected <%s>", f.name, f.contentAtOffset, string(buf))
+		}
+
+	}
+}
+
+func TestGcsSeek(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		if !f.exists {
+			continue
+		}
+
+		file, err := gcsAfs.Open(f.name)
+		if err != nil {
+			t.Fatalf("opening %v: %v", f.name, err)
+		}
+
+		var tests = []struct {
+			offIn  int64
+			whence int
+			offOut int64
+		}{
+			{0, io.SeekStart, 0},
+			{10, io.SeekStart, 10},
+			{1, io.SeekCurrent, 11},
+			{10, io.SeekCurrent, 21},
+			{0, io.SeekEnd, f.size},
+			{-1, io.SeekEnd, f.size - 1},
+		}
+
+		for _, s := range tests {
+			n, err := file.Seek(s.offIn, s.whence)
+			if err != nil {
+				if f.isdir && err == syscall.EISDIR {
+					continue
+				}
+
+				t.Errorf("%v: %v", f.name, err)
+			}
+
+			if n != s.offOut {
+				t.Errorf("%v: (off: %v, whence: %v): got %v, expected %v", f.name, s.offIn, s.whence, n, s.offOut)
+			}
+		}
+
+	}
+}
+
+func TestName(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		if !f.exists {
+			continue
+		}
+
+		file, err := gcsAfs.Open(f.name)
+		if err != nil {
+			t.Fatalf("opening %v: %v", f.name, err)
+		}
+
+		n := file.Name()
+		if n != filepath.FromSlash(f.name) {
+			t.Errorf("got: %v, expected: %v", n, filepath.FromSlash(f.name))
+		}
+
+	}
+}
+
+func TestClose(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		if !f.exists {
+			continue
+		}
+
+		file, err := gcsAfs.Open(f.name)
+		if err != nil {
+			t.Fatalf("opening %v: %v", f.name, err)
+		}
+
+		err = file.Close()
+		if err != nil {
+			t.Errorf("%v: %v", f.name, err)
+		}
+
+		err = file.Close()
+		if err == nil {
+			t.Errorf("%v: closing twice should return an error", f.name)
+		}
+
+		buf := make([]byte, 8)
+		n, err := file.Read(buf)
+		if n != 0 || err == nil {
+			t.Errorf("%v: could read from a closed file", f.name)
+		}
+
+		n, err = file.ReadAt(buf, 256)
+		if n != 0 || err == nil {
+			t.Errorf("%v: could readAt from a closed file", f.name)
+		}
+
+		off, err := file.Seek(0, io.SeekStart)
+		if off != 0 || err == nil {
+			t.Errorf("%v: could seek from a closed file", f.name)
+		}
+	}
+}
+
+func TestGcsOpenFile(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		file, err := gcsAfs.OpenFile(f.name, os.O_RDONLY, 0400)
+		if !f.exists {
+			if !errors.Is(err, syscall.ENOENT) {
+				t.Errorf("%v: got %v, expected%v", f.name, err, syscall.ENOENT)
+			}
+
+			continue
+		}
+
+		if err != nil {
+			t.Fatalf("%v: %v", f.name, err)
+		}
+
+		err = file.Close()
+		if err != nil {
+			t.Fatalf("failed to close a file \"%s\": %s", f.name, err)
+		}
+
+		file, err = gcsAfs.OpenFile(f.name, os.O_CREATE, 0600)
+		if !errors.Is(err, syscall.EPERM) {
+			t.Errorf("%v: open for write: got %v, expected %v", f.name, err, syscall.EPERM)
+		}
+
+	}
+}
+
+func TestFsStat(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, f := range files {
+		fi, err := gcsAfs.Stat(f.name)
+		if !f.exists {
+			if !errors.Is(err, syscall.ENOENT) {
+				t.Errorf("%v: got %v, expected%v", f.name, err, syscall.ENOENT)
+			}
+
+			continue
+		}
+
+		if err != nil {
+			t.Fatalf("stat %v: got error '%v'", f.name, err)
+		}
+
+		if isdir := fi.IsDir(); isdir != f.isdir {
+			t.Errorf("%v directory, got: %v, expected: %v", f.name, isdir, f.isdir)
+		}
+
+		if size := fi.Size(); size != f.size {
+			t.Errorf("%v size, got: %v, expected: %v", f.name, size, f.size)
+		}
+	}
+}
+
+func TestGcsReaddir(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, d := range dirs {
+		dir, err := gcsAfs.Open(d.name)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		fi, err := dir.Readdir(0)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var names []string
+		for _, f := range fi {
+			names = append(names, f.Name())
+		}
+
+		if !reflect.DeepEqual(names, d.children) {
+			t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children)
+		}
+
+		fi, err = dir.Readdir(1)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		names = []string{}
+		for _, f := range fi {
+			names = append(names, f.Name())
+		}
+
+		if !reflect.DeepEqual(names, d.children[0:1]) {
+			t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children[0:1])
+		}
+	}
+
+	dir, err := gcsAfs.Open("testFile")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = dir.Readdir(-1)
+	if err != syscall.ENOTDIR {
+		t.Fatal("Expected error")
+	}
+}
+
+func TestGcsReaddirnames(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, d := range dirs {
+		dir, err := gcsAfs.Open(d.name)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		names, err := dir.Readdirnames(0)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !reflect.DeepEqual(names, d.children) {
+			t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children)
+		}
+
+		names, err = dir.Readdirnames(1)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !reflect.DeepEqual(names, d.children[0:1]) {
+			t.Errorf("%v: children, got '%v', expected '%v'", d.name, names, d.children[0:1])
+		}
+	}
+
+	dir, err := gcsAfs.Open("testFile")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = dir.Readdir(-1)
+	if err != syscall.ENOTDIR {
+		t.Fatal("Expected error")
+	}
+}
+
+func TestGcsGlob(t *testing.T) {
+	createFiles(t)
+	defer removeFiles(t)
+
+	for _, s := range []struct {
+		glob    string
+		entries []string
+	}{
+		{filepath.FromSlash("/*"), []string{filepath.FromSlash("/sub"), filepath.FromSlash("/testDir1"), filepath.FromSlash("/testFile")}},
+		{filepath.FromSlash("*"), []string{filepath.FromSlash("sub"), filepath.FromSlash("testDir1"), filepath.FromSlash("testFile")}},
+		{filepath.FromSlash("/sub/*"), []string{filepath.FromSlash("/sub/testDir2")}},
+		{filepath.FromSlash("/sub/testDir2/*"), []string{filepath.FromSlash("/sub/testDir2/testFile")}},
+		{filepath.FromSlash("/testDir1/*"), []string{filepath.FromSlash("/testDir1/testFile")}},
+		{filepath.FromSlash("sub/*"), []string{filepath.FromSlash("sub/testDir2")}},
+		{filepath.FromSlash("sub/testDir2/*"), []string{filepath.FromSlash("sub/testDir2/testFile")}},
+		{filepath.FromSlash("testDir1/*"), []string{filepath.FromSlash("testDir1/testFile")}},
+	} {
+		entries, err := Glob(gcsAfs.Fs, s.glob)
+		if err != nil {
+			t.Error(err)
+		}
+		if reflect.DeepEqual(entries, s.entries) {
+			t.Logf("glob: %s: glob ok", s.glob)
+		} else {
+			t.Errorf("glob: %s: got %#v, expected %#v", s.glob, entries, s.entries)
+		}
+	}
+}
+
+func TestMkdir(t *testing.T) {
+	dirName := "/a-test-dir"
+	var err error
+
+	err = gcsAfs.Mkdir(dirName, 0755)
+	if err != nil {
+		t.Fatal("failed to create a folder with error", err)
+	}
+
+	info, err := gcsAfs.Stat(dirName)
+	if err != nil {
+		t.Fatal("failed to get info", err)
+	}
+	if !info.IsDir() {
+		t.Fatalf("%s: not a dir", dirName)
+	}
+	if !info.Mode().IsDir() {
+		t.Errorf("%s: mode is not directory", dirName)
+	}
+
+	if info.Mode() != os.ModeDir|0755 {
+		t.Errorf("%s: wrong permissions, expected drwxr-xr-x, got %s", dirName, info.Mode())
+	}
+
+	err = gcsAfs.Remove(dirName)
+	if err != nil {
+		t.Fatalf("could not delete the folder %s after the test with error: %s", dirName, err)
+	}
+}
+
+func TestMkdirAll(t *testing.T) {
+	err := gcsAfs.MkdirAll("/a/b/c", 0755)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	info, err := gcsAfs.Stat("/a")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !info.Mode().IsDir() {
+		t.Error("/a: mode is not directory")
+	}
+	if info.Mode() != os.ModeDir|0755 {
+		t.Errorf("/a: wrong permissions, expected drwxr-xr-x, got %s", info.Mode())
+	}
+	info, err = gcsAfs.Stat("/a/b")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !info.Mode().IsDir() {
+		t.Error("/a/b: mode is not directory")
+	}
+	if info.Mode() != os.ModeDir|0755 {
+		t.Errorf("/a/b: wrong permissions, expected drwxr-xr-x, got %s", info.Mode())
+	}
+	info, err = gcsAfs.Stat("/a/b/c")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !info.Mode().IsDir() {
+		t.Error("/a/b/c: mode is not directory")
+	}
+	if info.Mode() != os.ModeDir|0755 {
+		t.Errorf("/a/b/c: wrong permissions, expected drwxr-xr-x, got %s", info.Mode())
+	}
+
+	err = gcsAfs.RemoveAll("/a")
+	if err != nil {
+		t.Fatalf("failed to remove the folder /a with error: %s", err)
+	}
+}
diff --git a/gcsfs/errors.go b/gcsfs/errors.go
new file mode 100644
index 0000000..7468ad5
--- /dev/null
+++ b/gcsfs/errors.go
@@ -0,0 +1,30 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp
+// licensed under Apache License 2.0.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gcsfs
+
+import (
+	"errors"
+	"syscall"
+)
+
+var (
+	ErrFileClosed         = errors.New("file is closed")
+	ErrOutOfRange         = errors.New("out of range")
+	ErrObjectDoesNotExist = errors.New("storage: object doesn't exist")
+	ErrEmptyObjectName    = errors.New("storage: object name is empty")
+	ErrFileNotFound       = syscall.ENOENT
+)
diff --git a/gcsfs/file.go b/gcsfs/file.go
new file mode 100644
index 0000000..33364a4
--- /dev/null
+++ b/gcsfs/file.go
@@ -0,0 +1,305 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp
+// licensed under Apache License 2.0.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gcsfs
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"sort"
+	"syscall"
+
+	"github.com/googleapis/google-cloud-go-testing/storage/stiface"
+
+	"cloud.google.com/go/storage"
+
+	"google.golang.org/api/iterator"
+)
+
+// GcsFs is the Afero version adapted for GCS
+type GcsFile struct {
+	openFlags int
+	fhOffset  int64 //File handle specific offset
+	closed    bool
+	ReadDirIt stiface.ObjectIterator
+	resource  *gcsFileResource
+}
+
+func NewGcsFile(
+	ctx context.Context,
+	fs *GcsFs,
+	obj stiface.ObjectHandle,
+	openFlags int,
+	// Unused: there is no use to the file mode in GCloud just yet - but we keep it here, just in case we need it
+	fileMode os.FileMode,
+	name string,
+) *GcsFile {
+	return &GcsFile{
+		openFlags: openFlags,
+		fhOffset:  0,
+		closed:    false,
+		ReadDirIt: nil,
+		resource: &gcsFileResource{
+			ctx: ctx,
+			fs:  fs,
+
+			obj:      obj,
+			name:     name,
+			fileMode: fileMode,
+
+			currentGcsSize: 0,
+
+			offset: 0,
+			reader: nil,
+			writer: nil,
+		},
+	}
+}
+
+func NewGcsFileFromOldFH(
+	openFlags int,
+	fileMode os.FileMode,
+	oldFile *gcsFileResource,
+) *GcsFile {
+	res := &GcsFile{
+		openFlags: openFlags,
+		fhOffset:  0,
+		closed:    false,
+		ReadDirIt: nil,
+
+		resource: oldFile,
+	}
+	res.resource.fileMode = fileMode
+
+	return res
+}
+
+func (o *GcsFile) Close() error {
+	if o.closed {
+		// the afero spec expects the call to Close on a closed file to return an error
+		return ErrFileClosed
+	}
+	o.closed = true
+	return o.resource.Close()
+}
+
+func (o *GcsFile) Seek(newOffset int64, whence int) (int64, error) {
+	if o.closed {
+		return 0, ErrFileClosed
+	}
+
+	//Since this is an expensive operation; let's make sure we need it
+	if (whence == 0 && newOffset == o.fhOffset) || (whence == 1 && newOffset == 0) {
+		return o.fhOffset, nil
+	}
+	log.Printf("WARNING: Seek beavhior triggered, highly inefficent. Offset before seek is at %d\n", o.fhOffset)
+
+	//Fore the reader/writers to be reopened (at correct offset)
+	err := o.Sync()
+	if err != nil {
+		return 0, err
+	}
+	stat, err := o.Stat()
+	if err != nil {
+		return 0, nil
+	}
+
+	switch whence {
+	case 0:
+		o.fhOffset = newOffset
+	case 1:
+		o.fhOffset += newOffset
+	case 2:
+		o.fhOffset = stat.Size() + newOffset
+	}
+	return o.fhOffset, nil
+}
+
+func (o *GcsFile) Read(p []byte) (n int, err error) {
+	return o.ReadAt(p, o.fhOffset)
+}
+
+func (o *GcsFile) ReadAt(p []byte, off int64) (n int, err error) {
+	if o.closed {
+		return 0, ErrFileClosed
+	}
+
+	read, err := o.resource.ReadAt(p, off)
+	o.fhOffset += int64(read)
+	return read, err
+}
+
+func (o *GcsFile) Write(p []byte) (n int, err error) {
+	return o.WriteAt(p, o.fhOffset)
+}
+
+func (o *GcsFile) WriteAt(b []byte, off int64) (n int, err error) {
+	if o.closed {
+		return 0, ErrFileClosed
+	}
+
+	if o.openFlags&os.O_RDONLY != 0 {
+		return 0, fmt.Errorf("file is opend as read only")
+	}
+
+	_, err = o.resource.obj.Attrs(o.resource.ctx)
+	if err != nil {
+		if err == storage.ErrObjectNotExist {
+			if o.openFlags&os.O_CREATE == 0 {
+				return 0, ErrFileNotFound
+			}
+		} else {
+			return 0, fmt.Errorf("error getting file attributes: %v", err)
+		}
+	}
+
+	written, err := o.resource.WriteAt(b, off)
+	o.fhOffset += int64(written)
+	return written, err
+}
+
+func (o *GcsFile) Name() string {
+	return filepath.FromSlash(o.resource.name)
+}
+
+func (o *GcsFile) readdirImpl(count int) ([]*FileInfo, error) {
+	err := o.Sync()
+	if err != nil {
+		return nil, err
+	}
+
+	var ownInfo os.FileInfo
+	ownInfo, err = o.Stat()
+	if err != nil {
+		return nil, err
+	}
+
+	if !ownInfo.IsDir() {
+		return nil, syscall.ENOTDIR
+	}
+
+	path := o.resource.fs.ensureTrailingSeparator(o.Name())
+	if o.ReadDirIt == nil {
+		//log.Printf("Querying path : %s\n", path)
+		o.ReadDirIt = o.resource.fs.bucket.Objects(
+			o.resource.ctx, &storage.Query{Delimiter: o.resource.fs.separator, Prefix: path, Versions: false})
+	}
+	var res []*FileInfo
+	for {
+		object, err := o.ReadDirIt.Next()
+		if err == iterator.Done {
+			// reset the iterator
+			o.ReadDirIt = nil
+
+			if len(res) > 0 || count <= 0 {
+				return res, nil
+			}
+
+			return res, io.EOF
+		}
+		if err != nil {
+			return res, err
+		}
+
+		tmp := newFileInfoFromAttrs(object, o.resource.fileMode)
+
+		if tmp.Name() == "" {
+			// neither object.Name, not object.Prefix were present - so let's skip this unknown thing
+			continue
+		}
+
+		if object.Name == "" && object.Prefix == "" {
+			continue
+		}
+
+		if tmp.Name() == ownInfo.Name() {
+			// Hmmm
+			continue
+		}
+
+		res = append(res, tmp)
+
+		// This would interrupt the iteration, once we reach the count.
+		// But it would then have files coming before folders - that's not what we want to have exactly,
+		// since it makes the results unpredictable. Hence, we iterate all the objects and then do
+		// the cut-off in a higher level method
+		//if count > 0 && len(res) >= count {
+		//	break
+		//}
+	}
+	//return res, nil
+}
+
+func (o *GcsFile) Readdir(count int) ([]os.FileInfo, error) {
+	fi, err := o.readdirImpl(count)
+	if len(fi) > 0 {
+		sort.Sort(ByName(fi))
+	}
+
+	if count > 0 {
+		fi = fi[:count]
+	}
+
+	var res []os.FileInfo
+	for _, f := range fi {
+		res = append(res, f)
+	}
+	return res, err
+}
+
+func (o *GcsFile) Readdirnames(n int) ([]string, error) {
+	fi, err := o.Readdir(n)
+	if err != nil && err != io.EOF {
+		return nil, err
+	}
+	names := make([]string, len(fi))
+
+	for i, f := range fi {
+		names[i] = f.Name()
+	}
+	return names, err
+}
+
+func (o *GcsFile) Stat() (os.FileInfo, error) {
+	err := o.Sync()
+	if err != nil {
+		return nil, err
+	}
+
+	return newFileInfo(o.Name(), o.resource.fs, o.resource.fileMode)
+}
+
+func (o *GcsFile) Sync() error {
+	return o.resource.maybeCloseIo()
+}
+
+func (o *GcsFile) Truncate(wantedSize int64) error {
+	if o.closed {
+		return ErrFileClosed
+	}
+	if o.openFlags == os.O_RDONLY {
+		return fmt.Errorf("file was opened as read only")
+	}
+	return o.resource.Truncate(wantedSize)
+}
+
+func (o *GcsFile) WriteString(s string) (ret int, err error) {
+	return o.Write([]byte(s))
+}
diff --git a/gcsfs/file_info.go b/gcsfs/file_info.go
new file mode 100644
index 0000000..b14a5f6
--- /dev/null
+++ b/gcsfs/file_info.go
@@ -0,0 +1,137 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp
+// licensed under Apache License 2.0.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gcsfs
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"cloud.google.com/go/storage"
+)
+
+const (
+	folderSize = 42
+)
+
+type FileInfo struct {
+	name     string
+	size     int64
+	updated  time.Time
+	isDir    bool
+	fileMode os.FileMode
+}
+
+func newFileInfo(name string, fs *GcsFs, fileMode os.FileMode) (*FileInfo, error) {
+	res := &FileInfo{
+		name:     name,
+		size:     folderSize,
+		updated:  time.Time{},
+		isDir:    false,
+		fileMode: fileMode,
+	}
+
+	obj := fs.getObj(name)
+
+	objAttrs, err := obj.Attrs(fs.ctx)
+	if err != nil {
+		if err.Error() == ErrEmptyObjectName.Error() {
+			// It's a root folder here, we return right away
+			res.name = fs.ensureTrailingSeparator(res.name)
+			res.isDir = true
+			return res, nil
+		} else if err.Error() == ErrObjectDoesNotExist.Error() {
+			// Folders do not actually "exist" in GCloud, so we have to check, if something exists with
+			// such a prefix
+			it := fs.bucket.Objects(
+				fs.ctx, &storage.Query{Delimiter: fs.separator, Prefix: name, Versions: false})
+			if _, err = it.Next(); err == nil {
+				res.name = fs.ensureTrailingSeparator(res.name)
+				res.isDir = true
+				return res, nil
+			}
+
+			return nil, ErrFileNotFound
+		}
+		return nil, err
+	}
+
+	res.size = objAttrs.Size
+	res.updated = objAttrs.Updated
+
+	return res, nil
+}
+
+func newFileInfoFromAttrs(objAttrs *storage.ObjectAttrs, fileMode os.FileMode) *FileInfo {
+	res := &FileInfo{
+		name:     objAttrs.Name,
+		size:     objAttrs.Size,
+		updated:  objAttrs.Updated,
+		isDir:    false,
+		fileMode: fileMode,
+	}
+
+	if res.name == "" {
+		if objAttrs.Prefix != "" {
+			// It's a virtual folder! It does not have a name, but prefix - this is how GCS API
+			// deals with them at the moment
+			res.name = objAttrs.Prefix
+			res.size = folderSize
+			res.isDir = true
+		}
+	}
+
+	return res
+}
+
+func (fi *FileInfo) Name() string {
+	return filepath.Base(fi.name)
+}
+
+func (fi *FileInfo) Size() int64 {
+	return fi.size
+}
+func (fi *FileInfo) Mode() os.FileMode {
+	if fi.IsDir() {
+		return os.ModeDir | fi.fileMode
+	}
+	return fi.fileMode
+}
+
+func (fi *FileInfo) ModTime() time.Time {
+	return fi.updated
+}
+
+func (fi *FileInfo) IsDir() bool {
+	return fi.isDir
+}
+
+func (fi *FileInfo) Sys() interface{} {
+	return nil
+}
+
+type ByName []*FileInfo
+
+func (a ByName) Len() int { return len(a) }
+func (a ByName) Swap(i, j int) {
+	a[i].name, a[j].name = a[j].name, a[i].name
+	a[i].size, a[j].size = a[j].size, a[i].size
+	a[i].updated, a[j].updated = a[j].updated, a[i].updated
+	a[i].isDir, a[j].isDir = a[j].isDir, a[i].isDir
+}
+func (a ByName) Less(i, j int) bool { return strings.Compare(a[i].Name(), a[j].Name()) == -1 }
diff --git a/gcsfs/file_resource.go b/gcsfs/file_resource.go
new file mode 100644
index 0000000..b25d0e8
--- /dev/null
+++ b/gcsfs/file_resource.go
@@ -0,0 +1,271 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp
+// licensed under Apache License 2.0.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gcsfs
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"syscall"
+
+	"github.com/googleapis/google-cloud-go-testing/storage/stiface"
+)
+
+const (
+	maxWriteSize = 10000
+)
+
+// gcsFileResource represents a singleton version of each GCS object;
+// Google cloud storage allows users to open multiple writers(!) to the same
+// underlying resource, once the write is closed the written stream is commented. We are doing
+// some magic where we read and and write to the same file which requires synchronization
+// of the underlying resource.
+
+type gcsFileResource struct {
+	ctx context.Context
+
+	fs *GcsFs
+
+	obj      stiface.ObjectHandle
+	name     string
+	fileMode os.FileMode
+
+	currentGcsSize int64
+	offset         int64
+	reader         io.ReadCloser
+	writer         io.WriteCloser
+
+	closed bool
+}
+
+func (o *gcsFileResource) Close() error {
+	o.closed = true
+	// TODO rawGcsObjectsMap ?
+	return o.maybeCloseIo()
+}
+
+func (o *gcsFileResource) maybeCloseIo() error {
+	if err := o.maybeCloseReader(); err != nil {
+		return fmt.Errorf("error closing reader: %v", err)
+	}
+	if err := o.maybeCloseWriter(); err != nil {
+		return fmt.Errorf("error closing writer: %v", err)
+	}
+
+	return nil
+}
+
+func (o *gcsFileResource) maybeCloseReader() error {
+	if o.reader == nil {
+		return nil
+	}
+	if err := o.reader.Close(); err != nil {
+		return err
+	}
+	o.reader = nil
+	return nil
+}
+
+func (o *gcsFileResource) maybeCloseWriter() error {
+	if o.writer == nil {
+		return nil
+	}
+
+	// In cases of partial writes (e.g. to the middle of a file stream), we need to
+	// append any remaining data from the original file before we close the reader (and
+	// commit the results.)
+	// For small writes it can be more efficient
+	// to keep the original reader but that is for another iteration
+	if o.currentGcsSize > o.offset {
+		currentFile, err := o.obj.NewRangeReader(o.ctx, o.offset, -1)
+		if err != nil {
+			return fmt.Errorf(
+				"couldn't simulate a partial write; the closing (and thus"+
+					" the whole file write) is NOT commited to GCS. %v", err)
+		}
+		if currentFile != nil && currentFile.Remain() > 0 {
+			if _, err := io.Copy(o.writer, currentFile); err != nil {
+				return fmt.Errorf("error writing: %v", err)
+			}
+		}
+	}
+
+	if err := o.writer.Close(); err != nil {
+		return err
+	}
+	o.writer = nil
+	return nil
+}
+
+func (o *gcsFileResource) ReadAt(p []byte, off int64) (n int, err error) {
+	if cap(p) == 0 {
+		return 0, nil
+	}
+
+	// Assume that if the reader is open; it is at the correct offset
+	// a good performance assumption that we must ensure holds
+	if off == o.offset && o.reader != nil {
+		n, err = o.reader.Read(p)
+		o.offset += int64(n)
+		return n, err
+	}
+
+	// we have to check, whether it's a folder; the folder must not have an open readers, or writers though,
+	// so this check should not be invoked excessively and cause too much of a performance drop
+	if o.reader == nil && o.writer == nil {
+		var info *FileInfo
+		info, err = newFileInfo(o.name, o.fs, o.fileMode)
+		if err != nil {
+			return 0, err
+		}
+
+		if info.IsDir() {
+			// trying to read a directory must return this
+			return 0, syscall.EISDIR
+		}
+	}
+
+	// If any writers have written anything; commit it first so we can read it back.
+	if err = o.maybeCloseIo(); err != nil {
+		return 0, err
+	}
+
+	//Then read at the correct offset.
+	r, err := o.obj.NewRangeReader(o.ctx, off, -1)
+	if err != nil {
+		return 0, err
+	}
+	o.reader = r
+	o.offset = off
+
+	read, err := o.reader.Read(p)
+	o.offset += int64(read)
+	return read, err
+}
+
+func (o *gcsFileResource) WriteAt(b []byte, off int64) (n int, err error) {
+	//If the writer is opened and at the correct offset we're good!
+	if off == o.offset && o.writer != nil {
+		n, err = o.writer.Write(b)
+		o.offset += int64(n)
+		return n, err
+	}
+
+	// Ensure readers must be re-opened and that if a writer is active at another
+	// offset it is first committed before we do a "seek" below
+	if err = o.maybeCloseIo(); err != nil {
+		return 0, err
+	}
+
+	w := o.obj.NewWriter(o.ctx)
+	// TRIGGER WARNING: This can seem like a hack but it works thanks
+	// to GCS strong consistency. We will open and write to the same file; First when the
+	// writer is closed will the content get committed to GCS.
+	// The general idea is this:
+	// Objectv1[:offset] -> Objectv2
+	// newData1 -> Objectv2
+	// Objectv1[offset+len(newData1):] -> Objectv2
+	// Objectv2.Close
+	//
+	// It will however require a download and upload of the original file but it
+	// can't be avoided if we should support seek-write-operations on GCS.
+	objAttrs, err := o.obj.Attrs(o.ctx)
+	if err != nil {
+		if off > 0 {
+			return 0, err // WriteAt to a non existing file
+		}
+
+		o.currentGcsSize = 0
+	} else {
+		o.currentGcsSize = objAttrs.Size
+	}
+
+	if off > o.currentGcsSize {
+		return 0, ErrOutOfRange
+	}
+
+	if off > 0 {
+		var r stiface.Reader
+		r, err = o.obj.NewReader(o.ctx)
+		if err != nil {
+			return 0, err
+		}
+		if _, err = io.CopyN(w, r, off); err != nil {
+			return 0, err
+		}
+		if err = r.Close(); err != nil {
+			return 0, err
+		}
+	}
+
+	o.writer = w
+	o.offset = off
+
+	written, err := o.writer.Write(b)
+
+	o.offset += int64(written)
+	return written, err
+}
+
+func min(x, y int) int {
+	if x < y {
+		return x
+	}
+	return y
+}
+
+func (o *gcsFileResource) Truncate(wantedSize int64) error {
+	if wantedSize < 0 {
+		return ErrOutOfRange
+	}
+
+	if err := o.maybeCloseIo(); err != nil {
+		return err
+	}
+
+	r, err := o.obj.NewRangeReader(o.ctx, 0, wantedSize)
+	if err != nil {
+		return err
+	}
+
+	w := o.obj.NewWriter(o.ctx)
+	written, err := io.Copy(w, r)
+	if err != nil {
+		return err
+	}
+
+	for written < wantedSize {
+		//Bulk up padding writes
+		paddingBytes := bytes.Repeat([]byte(" "), min(maxWriteSize, int(wantedSize-written)))
+
+		n := 0
+		if n, err = w.Write(paddingBytes); err != nil {
+			return err
+		}
+
+		written += int64(n)
+	}
+	if err = r.Close(); err != nil {
+		return fmt.Errorf("error closing reader: %v", err)
+	}
+	if err = w.Close(); err != nil {
+		return fmt.Errorf("error closing writer: %v", err)
+	}
+	return nil
+}
diff --git a/gcsfs/fs.go b/gcsfs/fs.go
new file mode 100644
index 0000000..79bfa3b
--- /dev/null
+++ b/gcsfs/fs.go
@@ -0,0 +1,344 @@
+// Copyright © 2021 Vasily Ovchinnikov <vasily@remerge.io>.
+//
+// The code in this file is derived from afero fork github.com/Zatte/afero by Mikael Rapp
+// licensed under Apache License 2.0.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gcsfs
+
+import (
+	"context"
+	"errors"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/googleapis/google-cloud-go-testing/storage/stiface"
+)
+
+const (
+	defaultFileMode = 0755
+)
+
+// GcsFs is a Fs implementation that uses functions provided by google cloud storage
+type GcsFs struct {
+	ctx           context.Context
+	bucket        stiface.BucketHandle
+	separator     string
+	rawGcsObjects map[string]*GcsFile
+
+	autoRemoveEmptyFolders bool //trigger for creating "virtual folders" (not required by GCSs)
+}
+
+func NewGcsFs(ctx context.Context, bucket stiface.BucketHandle) *GcsFs {
+	return NewGcsFsWithSeparator(ctx, bucket, "/")
+}
+
+func NewGcsFsWithSeparator(ctx context.Context, bucket stiface.BucketHandle, folderSep string) *GcsFs {
+	return &GcsFs{
+		ctx:           ctx,
+		bucket:        bucket,
+		separator:     folderSep,
+		rawGcsObjects: make(map[string]*GcsFile),
+
+		autoRemoveEmptyFolders: true,
+	}
+}
+
+// normSeparators will normalize all "\\" and "/" to the provided separator
+func (fs *GcsFs) normSeparators(s string) string {
+	return strings.Replace(strings.Replace(s, "\\", fs.separator, -1), "/", fs.separator, -1)
+}
+
+func (fs *GcsFs) ensureTrailingSeparator(s string) string {
+	if len(s) > 0 && !strings.HasSuffix(s, fs.separator) {
+		return s + fs.separator
+	}
+	return s
+}
+
+func (fs *GcsFs) ensureNoLeadingSeparators(s string) string {
+	// GCS does REALLY not like the names, that begin with a separator
+	if len(s) > 0 && strings.HasPrefix(s, fs.separator) {
+		log.Printf(
+			"WARNING: the provided path \"%s\" starts with a separator \"%s\", which is not supported by "+
+				"GCloud. The separator will be automatically trimmed",
+			s,
+			fs.separator,
+		)
+		return s[len(fs.separator):]
+	}
+	return s
+}
+
+func correctTheDot(s string) string {
+	// So, Afero's Glob likes to give "." as a name - that to list the "empty" dir name.
+	// GCS _really_ dislikes the dot and gives no entries for it - so we should rather replace the dot
+	// with an empty string
+	if s == "." {
+		return ""
+	}
+	return s
+}
+
+func (fs *GcsFs) getObj(name string) stiface.ObjectHandle {
+	return fs.bucket.Object(name)
+}
+
+func (fs *GcsFs) Name() string { return "GcsFs" }
+
+func (fs *GcsFs) Create(name string) (*GcsFile, error) {
+	name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name)))
+
+	if !fs.autoRemoveEmptyFolders {
+		baseDir := filepath.Base(name)
+		if stat, err := fs.Stat(baseDir); err != nil || !stat.IsDir() {
+			err = fs.MkdirAll(baseDir, 0)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	obj := fs.getObj(name)
+	w := obj.NewWriter(fs.ctx)
+	var err error
+	err = w.Close()
+	if err != nil {
+		return nil, err
+	}
+	file := NewGcsFile(fs.ctx, fs, obj, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0, name)
+
+	fs.rawGcsObjects[name] = file
+	return file, nil
+}
+
+func (fs *GcsFs) Mkdir(name string, _ os.FileMode) error {
+	name = fs.ensureTrailingSeparator(fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name))))
+
+	obj := fs.getObj(name)
+	w := obj.NewWriter(fs.ctx)
+	return w.Close()
+}
+
+func (fs *GcsFs) MkdirAll(path string, perm os.FileMode) error {
+	path = fs.ensureTrailingSeparator(fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(path))))
+
+	root := ""
+	folders := strings.Split(path, fs.separator)
+	for i, f := range folders {
+		if f == "" && i != 0 {
+			continue // it's the last item - it should be empty
+		}
+		//Don't force a delimiter prefix
+		if root != "" {
+			root = root + fs.separator + f
+		} else {
+			root = f
+		}
+
+		if err := fs.Mkdir(root, perm); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (fs *GcsFs) Open(name string) (*GcsFile, error) {
+	return fs.OpenFile(name, os.O_RDONLY, 0)
+}
+
+func (fs *GcsFs) OpenFile(name string, flag int, fileMode os.FileMode) (*GcsFile, error) {
+	var file *GcsFile
+	var err error
+
+	name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name)))
+
+	obj, found := fs.rawGcsObjects[name]
+	if found {
+		file = NewGcsFileFromOldFH(flag, fileMode, obj.resource)
+	} else {
+		file = NewGcsFile(fs.ctx, fs, fs.getObj(name), flag, fileMode, name)
+	}
+
+	if flag == os.O_RDONLY {
+		_, err = file.Stat()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if flag&os.O_TRUNC != 0 {
+		err = file.resource.obj.Delete(fs.ctx)
+		if err != nil {
+			return nil, err
+		}
+		return fs.Create(name)
+	}
+
+	if flag&os.O_APPEND != 0 {
+		_, err = file.Seek(0, 2)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if flag&os.O_CREATE != 0 {
+		_, err = file.Stat()
+		if err == nil { // the file actually exists
+			return nil, syscall.EPERM
+		}
+
+		_, err = file.WriteString("")
+		if err != nil {
+			return nil, err
+		}
+	}
+	return file, nil
+}
+
+func (fs *GcsFs) Remove(name string) error {
+	name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name)))
+
+	obj := fs.getObj(name)
+	info, err := fs.Stat(name)
+	if err != nil {
+		return err
+	}
+	delete(fs.rawGcsObjects, name)
+
+	if info.IsDir() {
+		// it's a folder, we ha to check its contents - it cannot be removed, if not empty
+		var dir *GcsFile
+		dir, err = fs.Open(name)
+		if err != nil {
+			return err
+		}
+		var infos []os.FileInfo
+		infos, err = dir.Readdir(0)
+		if len(infos) > 0 {
+			return syscall.ENOTEMPTY
+		}
+
+		// it's an empty folder, we can continue
+		name = fs.ensureTrailingSeparator(name)
+		obj = fs.getObj(name)
+
+		return obj.Delete(fs.ctx)
+	}
+	return obj.Delete(fs.ctx)
+}
+
+func (fs *GcsFs) RemoveAll(path string) error {
+	path = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(path)))
+
+	pathInfo, err := fs.Stat(path)
+	if err != nil {
+		return err
+	}
+	if !pathInfo.IsDir() {
+		return fs.Remove(path)
+	}
+
+	var dir *GcsFile
+	dir, err = fs.Open(path)
+	if err != nil {
+		return err
+	}
+
+	var infos []os.FileInfo
+	infos, err = dir.Readdir(0)
+	for _, info := range infos {
+		err = fs.RemoveAll(path + fs.separator + info.Name())
+		if err != nil {
+			return err
+		}
+	}
+
+	return fs.Remove(path)
+
+	//it := fs.bucket.Objects(fs.ctx, &storage.Query{Delimiter: fs.separator, Prefix: path, Versions: false})
+	//for {
+	//	objAttrs, err := it.Next()
+	//	if err == iterator.Done {
+	//		break
+	//	}
+	//	if err != nil {
+	//		return err
+	//	}
+	//
+	//	name := objAttrs.Name
+	//	if name == "" {
+	//		name = objAttrs.Prefix
+	//	}
+	//
+	//	if name == path {
+	//		// somehow happens
+	//		continue
+	//	}
+	//	if objAttrs.Name == "" && objAttrs.Prefix != "" {
+	//		// it's a folder, let's try to remove it normally first
+	//		err = fs.Remove(path + fs.separator + objAttrs.Name)
+	//		if err != nil {
+	//			if err == syscall.ENOTEMPTY {
+	//				err = fs.RemoveAll(path + fs.separator + objAttrs.Name)
+	//			}
+	//		}
+	//		if err != nil {
+	//			return err
+	//		}
+	//
+	//	} else {
+	//		err = fs.Remove(objAttrs.Name)
+	//		if err != nil {
+	//			return err
+	//		}
+	//	}
+	//}
+	//return nil
+}
+
+func (fs *GcsFs) Rename(oldName, newName string) error {
+	oldName = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(oldName)))
+	newName = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(newName)))
+
+	src := fs.bucket.Object(oldName)
+	dst := fs.bucket.Object(newName)
+
+	if _, err := dst.CopierFrom(src).Run(fs.ctx); err != nil {
+		return err
+	}
+	delete(fs.rawGcsObjects, oldName)
+	return src.Delete(fs.ctx)
+}
+
+func (fs *GcsFs) Stat(name string) (os.FileInfo, error) {
+	name = fs.ensureNoLeadingSeparators(fs.normSeparators(correctTheDot(name)))
+
+	return newFileInfo(name, fs, defaultFileMode)
+}
+
+func (fs *GcsFs) Chmod(_ string, _ os.FileMode) error {
+	return errors.New("method Chmod is not implemented in GCS")
+}
+
+func (fs *GcsFs) Chtimes(_ string, _, _ time.Time) error {
+	return errors.New("method Chtimes is not implemented. Create, Delete, Updated times are read only fields in GCS and set implicitly")
+}
+
+func (fs *GcsFs) Chown(_ string, _, _ int) error {
+	return errors.New("method Chown is not implemented for GCS")
+}
diff --git a/go.mod b/go.mod
index abe4fe1..8c17b67 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,13 @@
 module github.com/spf13/afero
 
 require (
+	cloud.google.com/go/storage v1.14.0
+	github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8
 	github.com/pkg/sftp v1.10.1
-	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
-	golang.org/x/text v0.3.3
+	github.com/stretchr/testify v1.5.1
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	golang.org/x/text v0.3.4
+	google.golang.org/api v0.40.0
 )
 
 go 1.13
diff --git a/go.sum b/go.sum
index 89d9bfb..d7a8389 100644
--- a/go.sum
+++ b/go.sum
@@ -1,29 +1,459 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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