add rootfstest
parent
eb9f4d5400
commit
cb1045db17
|
|
@ -20,6 +20,7 @@ go_test(
|
|||
],
|
||||
embed = [":go_default_library"],
|
||||
deps = [
|
||||
"//src/undocker/rootfs/rootfstest:go_default_library",
|
||||
"@com_github_stretchr_testify//assert:go_default_library",
|
||||
"@com_github_stretchr_testify//require:go_default_library",
|
||||
],
|
||||
|
|
|
|||
|
|
@ -1,28 +1,39 @@
|
|||
package rootfs
|
||||
|
||||
import (
|
||||
"archive/tar"
|
||||
"bytes"
|
||||
"encoding/json"
|
||||
"io"
|
||||
"testing"
|
||||
|
||||
"github.com/motiejus/code/undocker/rootfs/rootfstest"
|
||||
"github.com/stretchr/testify/assert"
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
type (
|
||||
file = rootfstest.File
|
||||
dir = rootfstest.Dir
|
||||
hardlink = rootfstest.Hardlink
|
||||
manifest = rootfstest.Manifest
|
||||
extractable = rootfstest.Extractable
|
||||
tarball = rootfstest.Tarball
|
||||
)
|
||||
|
||||
var (
|
||||
extract = rootfstest.Extract
|
||||
)
|
||||
|
||||
func TestRootFS(t *testing.T) {
|
||||
layer0 := tarball{
|
||||
dir{name: "/", uid: 0},
|
||||
file{name: "/file", uid: 0, contents: bytes.NewBufferString("from 0")},
|
||||
dir{Name: "/", Uid: 0},
|
||||
file{Name: "/file", Uid: 0, Contents: bytes.NewBufferString("from 0")},
|
||||
}
|
||||
|
||||
layer1 := tarball{
|
||||
file{name: "/file", uid: 1, contents: bytes.NewBufferString("from 1")},
|
||||
file{Name: "/file", Uid: 1, Contents: bytes.NewBufferString("from 1")},
|
||||
}
|
||||
|
||||
layer2 := tarball{
|
||||
dir{name: "/", uid: 2},
|
||||
dir{Name: "/", Uid: 2},
|
||||
}
|
||||
|
||||
tests := []struct {
|
||||
|
|
@ -44,60 +55,60 @@ func TestRootFS(t *testing.T) {
|
|||
{
|
||||
name: "basic file overwrite, layer order mixed",
|
||||
image: tarball{
|
||||
file{name: "layer1/layer.tar", contents: layer1},
|
||||
file{name: "layer0/layer.tar", contents: layer0},
|
||||
file{Name: "layer1/layer.tar", Contents: layer1},
|
||||
file{Name: "layer0/layer.tar", Contents: layer0},
|
||||
manifest{"layer0/layer.tar", "layer1/layer.tar"},
|
||||
},
|
||||
want: []extractable{
|
||||
dir{name: "/", uid: 0},
|
||||
file{name: "/file", uid: 1, contents: bytes.NewBufferString("from 1")},
|
||||
dir{Name: "/", Uid: 0},
|
||||
file{Name: "/file", Uid: 1, Contents: bytes.NewBufferString("from 1")},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "directory overwrite retains original dir",
|
||||
image: tarball{
|
||||
file{name: "layer2/layer.tar", contents: layer2},
|
||||
file{name: "layer0/layer.tar", contents: layer0},
|
||||
file{name: "layer1/layer.tar", contents: layer1},
|
||||
file{Name: "layer2/layer.tar", Contents: layer2},
|
||||
file{Name: "layer0/layer.tar", Contents: layer0},
|
||||
file{Name: "layer1/layer.tar", Contents: layer1},
|
||||
manifest{"layer0/layer.tar", "layer1/layer.tar", "layer2/layer.tar"},
|
||||
},
|
||||
want: []extractable{
|
||||
dir{name: "/", uid: 0},
|
||||
file{name: "/file", uid: 1, contents: bytes.NewBufferString("from 1")},
|
||||
dir{name: "/", uid: 2},
|
||||
dir{Name: "/", Uid: 0},
|
||||
file{Name: "/file", Uid: 1, Contents: bytes.NewBufferString("from 1")},
|
||||
dir{Name: "/", Uid: 2},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "simple whiteout",
|
||||
image: tarball{
|
||||
file{name: "layer0/layer.tar", contents: tarball{
|
||||
file{name: "filea"},
|
||||
file{name: "fileb"},
|
||||
dir{name: "dira"},
|
||||
dir{name: "dirb"},
|
||||
file{Name: "layer0/layer.tar", Contents: tarball{
|
||||
file{Name: "filea"},
|
||||
file{Name: "fileb"},
|
||||
dir{Name: "dira"},
|
||||
dir{Name: "dirb"},
|
||||
}},
|
||||
file{name: "layer1/layer.tar", contents: tarball{
|
||||
hardlink{name: ".wh.filea"},
|
||||
hardlink{name: ".wh.dira"},
|
||||
file{Name: "layer1/layer.tar", Contents: tarball{
|
||||
hardlink{Name: ".wh.filea"},
|
||||
hardlink{Name: ".wh.dira"},
|
||||
}},
|
||||
manifest{"layer0/layer.tar", "layer1/layer.tar"},
|
||||
},
|
||||
want: []extractable{
|
||||
file{name: "fileb"},
|
||||
dir{name: "dirb"},
|
||||
file{Name: "fileb"},
|
||||
dir{Name: "dirb"},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "whiteout with override",
|
||||
image: tarball{
|
||||
file{name: "layer0/layer.tar", contents: tarball{
|
||||
file{name: "file", contents: bytes.NewBufferString("from 0")},
|
||||
file{Name: "layer0/layer.tar", Contents: tarball{
|
||||
file{Name: "file", Contents: bytes.NewBufferString("from 0")},
|
||||
}},
|
||||
file{name: "layer1/layer.tar", contents: tarball{
|
||||
hardlink{name: ".wh.file"},
|
||||
file{Name: "layer1/layer.tar", Contents: tarball{
|
||||
hardlink{Name: ".wh.file"},
|
||||
}},
|
||||
file{name: "layer2/layer.tar", contents: tarball{
|
||||
file{name: "file", contents: bytes.NewBufferString("from 3")},
|
||||
file{Name: "layer2/layer.tar", Contents: tarball{
|
||||
file{Name: "file", Contents: bytes.NewBufferString("from 3")},
|
||||
}},
|
||||
manifest{
|
||||
"layer0/layer.tar",
|
||||
|
|
@ -106,42 +117,42 @@ func TestRootFS(t *testing.T) {
|
|||
},
|
||||
},
|
||||
want: []extractable{
|
||||
file{name: "file", contents: bytes.NewBufferString("from 3")},
|
||||
file{Name: "file", Contents: bytes.NewBufferString("from 3")},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "directories do not whiteout",
|
||||
image: tarball{
|
||||
file{name: "layer0/layer.tar", contents: tarball{
|
||||
dir{name: "dir"},
|
||||
file{Name: "layer0/layer.tar", Contents: tarball{
|
||||
dir{Name: "dir"},
|
||||
}},
|
||||
file{name: "layer1/layer.tar", contents: tarball{
|
||||
dir{name: ".wh.dir"},
|
||||
file{Name: "layer1/layer.tar", Contents: tarball{
|
||||
dir{Name: ".wh.dir"},
|
||||
}},
|
||||
manifest{"layer0/layer.tar", "layer1/layer.tar"},
|
||||
},
|
||||
want: []extractable{
|
||||
dir{name: "dir"},
|
||||
dir{name: ".wh.dir"},
|
||||
dir{Name: "dir"},
|
||||
dir{Name: ".wh.dir"},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "simple readdir whiteout",
|
||||
image: tarball{
|
||||
file{name: "layer0/layer.tar", contents: tarball{
|
||||
dir{name: "a"},
|
||||
file{name: "a/filea"},
|
||||
file{Name: "layer0/layer.tar", Contents: tarball{
|
||||
dir{Name: "a"},
|
||||
file{Name: "a/filea"},
|
||||
}},
|
||||
file{name: "layer1/layer.tar", contents: tarball{
|
||||
dir{name: "a"},
|
||||
file{name: "a/fileb"},
|
||||
hardlink{name: "a/.wh..wh..opq"},
|
||||
file{Name: "layer1/layer.tar", Contents: tarball{
|
||||
dir{Name: "a"},
|
||||
file{Name: "a/fileb"},
|
||||
hardlink{Name: "a/.wh..wh..opq"},
|
||||
}},
|
||||
manifest{"layer0/layer.tar", "layer1/layer.tar"},
|
||||
},
|
||||
want: []extractable{
|
||||
dir{name: "a"},
|
||||
file{name: "a/fileb"},
|
||||
dir{Name: "a"},
|
||||
file{Name: "a/fileb"},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
|
@ -162,123 +173,3 @@ func TestRootFS(t *testing.T) {
|
|||
})
|
||||
}
|
||||
}
|
||||
|
||||
// Helpers
|
||||
|
||||
type tarrer interface {
|
||||
tar(*tar.Writer)
|
||||
}
|
||||
|
||||
type byter interface {
|
||||
Bytes() []byte
|
||||
}
|
||||
|
||||
type tarball []tarrer
|
||||
|
||||
func (tb tarball) Bytes() []byte {
|
||||
buf := bytes.Buffer{}
|
||||
tw := tar.NewWriter(&buf)
|
||||
for _, member := range tb {
|
||||
member.tar(tw)
|
||||
}
|
||||
tw.Close()
|
||||
return buf.Bytes()
|
||||
}
|
||||
|
||||
// extractable is an empty interface for comparing extracted outputs in tests.
|
||||
// Using that just to avoid the ugly `interface{}`.
|
||||
type extractable interface{}
|
||||
|
||||
type dir struct {
|
||||
name string
|
||||
uid int
|
||||
}
|
||||
|
||||
func (d dir) tar(tw *tar.Writer) {
|
||||
hdr := &tar.Header{
|
||||
Typeflag: tar.TypeDir,
|
||||
Name: d.name,
|
||||
Mode: 0644,
|
||||
Uid: d.uid,
|
||||
}
|
||||
tw.WriteHeader(hdr)
|
||||
}
|
||||
|
||||
type file struct {
|
||||
name string
|
||||
uid int
|
||||
contents byter
|
||||
}
|
||||
|
||||
func (f file) tar(tw *tar.Writer) {
|
||||
var contentbytes []byte
|
||||
if f.contents != nil {
|
||||
contentbytes = f.contents.Bytes()
|
||||
}
|
||||
hdr := &tar.Header{
|
||||
Typeflag: tar.TypeReg,
|
||||
Name: f.name,
|
||||
Mode: 0644,
|
||||
Uid: f.uid,
|
||||
Size: int64(len(contentbytes)),
|
||||
}
|
||||
tw.WriteHeader(hdr)
|
||||
tw.Write(contentbytes)
|
||||
}
|
||||
|
||||
type manifest []string
|
||||
|
||||
func (m manifest) tar(tw *tar.Writer) {
|
||||
b, err := json.Marshal(dockerManifestJSON{{Layers: m}})
|
||||
if err != nil {
|
||||
panic("testerr")
|
||||
}
|
||||
file{
|
||||
name: "manifest.json",
|
||||
uid: 0,
|
||||
contents: bytes.NewBuffer(b),
|
||||
}.tar(tw)
|
||||
}
|
||||
|
||||
type hardlink struct {
|
||||
name string
|
||||
uid int
|
||||
}
|
||||
|
||||
func (h hardlink) tar(tw *tar.Writer) {
|
||||
tw.WriteHeader(&tar.Header{
|
||||
Typeflag: tar.TypeLink,
|
||||
Name: h.name,
|
||||
Mode: 0644,
|
||||
Uid: h.uid,
|
||||
})
|
||||
}
|
||||
|
||||
func extract(t *testing.T, r io.Reader) []extractable {
|
||||
t.Helper()
|
||||
ret := []extractable{}
|
||||
tr := tar.NewReader(r)
|
||||
for {
|
||||
hdr, err := tr.Next()
|
||||
if err == io.EOF {
|
||||
break
|
||||
}
|
||||
require.NoError(t, err)
|
||||
|
||||
var elem extractable
|
||||
switch hdr.Typeflag {
|
||||
case tar.TypeDir:
|
||||
elem = dir{name: hdr.Name, uid: hdr.Uid}
|
||||
case tar.TypeReg:
|
||||
f := file{name: hdr.Name, uid: hdr.Uid}
|
||||
if hdr.Size > 0 {
|
||||
var buf bytes.Buffer
|
||||
io.Copy(&buf, tr)
|
||||
f.contents = &buf
|
||||
}
|
||||
elem = f
|
||||
}
|
||||
ret = append(ret, elem)
|
||||
}
|
||||
return ret
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,16 @@
|
|||
load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
|
||||
|
||||
go_library(
|
||||
name = "go_default_library",
|
||||
srcs = ["rootfstest.go"],
|
||||
importpath = "github.com/motiejus/code/undocker/rootfs/rootfstest",
|
||||
visibility = ["//visibility:public"],
|
||||
deps = ["@com_github_stretchr_testify//require:go_default_library"],
|
||||
)
|
||||
|
||||
go_test(
|
||||
name = "go_default_test",
|
||||
srcs = ["rootfstest_test.go"],
|
||||
embed = [":go_default_library"],
|
||||
deps = ["@com_github_stretchr_testify//assert:go_default_library"],
|
||||
)
|
||||
|
|
@ -0,0 +1,137 @@
|
|||
package rootfstest
|
||||
|
||||
import (
|
||||
"archive/tar"
|
||||
"bytes"
|
||||
"encoding/json"
|
||||
"io"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
type (
|
||||
Tarrer interface {
|
||||
Tar(*tar.Writer)
|
||||
}
|
||||
|
||||
Byter interface {
|
||||
Bytes() []byte
|
||||
}
|
||||
|
||||
Tarball []Tarrer
|
||||
|
||||
// Extractable is an empty interface for comparing extracted outputs in tests.
|
||||
// Using that just to avoid the ugly `interface{}`.
|
||||
Extractable interface{}
|
||||
|
||||
Dir struct {
|
||||
Name string
|
||||
Uid int
|
||||
}
|
||||
|
||||
File struct {
|
||||
Name string
|
||||
Uid int
|
||||
Contents Byter
|
||||
}
|
||||
|
||||
Manifest []string
|
||||
|
||||
Hardlink struct {
|
||||
Name string
|
||||
Uid int
|
||||
}
|
||||
|
||||
dockerManifestJSON []struct {
|
||||
Layers []string `json:"Layers"`
|
||||
}
|
||||
)
|
||||
|
||||
func (tb Tarball) Bytes() []byte {
|
||||
buf := bytes.Buffer{}
|
||||
tw := tar.NewWriter(&buf)
|
||||
for _, member := range tb {
|
||||
member.Tar(tw)
|
||||
}
|
||||
tw.Close()
|
||||
return buf.Bytes()
|
||||
}
|
||||
|
||||
func (d Dir) Tar(tw *tar.Writer) {
|
||||
hdr := &tar.Header{
|
||||
Typeflag: tar.TypeDir,
|
||||
Name: d.Name,
|
||||
Mode: 0644,
|
||||
Uid: d.Uid,
|
||||
}
|
||||
tw.WriteHeader(hdr)
|
||||
}
|
||||
|
||||
func (f File) Tar(tw *tar.Writer) {
|
||||
var contentbytes []byte
|
||||
if f.Contents != nil {
|
||||
contentbytes = f.Contents.Bytes()
|
||||
}
|
||||
hdr := &tar.Header{
|
||||
Typeflag: tar.TypeReg,
|
||||
Name: f.Name,
|
||||
Mode: 0644,
|
||||
Uid: f.Uid,
|
||||
Size: int64(len(contentbytes)),
|
||||
}
|
||||
tw.WriteHeader(hdr)
|
||||
tw.Write(contentbytes)
|
||||
}
|
||||
|
||||
func (m Manifest) Tar(tw *tar.Writer) {
|
||||
b, err := json.Marshal(dockerManifestJSON{{Layers: m}})
|
||||
if err != nil {
|
||||
panic("testerr")
|
||||
}
|
||||
File{
|
||||
Name: "manifest.json",
|
||||
Uid: 0,
|
||||
Contents: bytes.NewBuffer(b),
|
||||
}.Tar(tw)
|
||||
}
|
||||
|
||||
func (h Hardlink) Tar(tw *tar.Writer) {
|
||||
tw.WriteHeader(&tar.Header{
|
||||
Typeflag: tar.TypeLink,
|
||||
Name: h.Name,
|
||||
Mode: 0644,
|
||||
Uid: h.Uid,
|
||||
})
|
||||
}
|
||||
|
||||
func Extract(t *testing.T, r io.Reader) []Extractable {
|
||||
t.Helper()
|
||||
ret := []Extractable{}
|
||||
tr := tar.NewReader(r)
|
||||
for {
|
||||
hdr, err := tr.Next()
|
||||
if err == io.EOF {
|
||||
break
|
||||
}
|
||||
require.NoError(t, err)
|
||||
|
||||
var elem Extractable
|
||||
switch hdr.Typeflag {
|
||||
case tar.TypeDir:
|
||||
elem = Dir{Name: hdr.Name, Uid: hdr.Uid}
|
||||
case tar.TypeLink:
|
||||
elem = Hardlink{Name: hdr.Name}
|
||||
case tar.TypeReg:
|
||||
f := File{Name: hdr.Name, Uid: hdr.Uid}
|
||||
if hdr.Size > 0 {
|
||||
var buf bytes.Buffer
|
||||
io.Copy(&buf, tr)
|
||||
f.Contents = &buf
|
||||
}
|
||||
elem = f
|
||||
}
|
||||
ret = append(ret, elem)
|
||||
}
|
||||
return ret
|
||||
}
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
package rootfstest
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/assert"
|
||||
)
|
||||
|
||||
func TestTarball(t *testing.T) {
|
||||
bk := Tarball{File{Name: "entrypoint.sh", Contents: bytes.NewBufferString("hello")}}
|
||||
img := Tarball{
|
||||
File{Name: "backup.tar", Contents: bk},
|
||||
File{Name: "entrypoint.sh", Contents: bytes.NewBufferString("bye")},
|
||||
Dir{Name: "bin"},
|
||||
Hardlink{Name: "entrypoint2"},
|
||||
}
|
||||
|
||||
got := Extract(t, bytes.NewBuffer(img.Bytes()))
|
||||
want := []Extractable{
|
||||
File{Name: "backup.tar", Contents: bytes.NewBuffer(bk.Bytes())},
|
||||
File{Name: "entrypoint.sh", Contents: bytes.NewBufferString("bye")},
|
||||
Dir{Name: "bin"},
|
||||
Hardlink{Name: "entrypoint2"},
|
||||
}
|
||||
|
||||
assert.Equal(t, want, got)
|
||||
}
|
||||
Loading…
Reference in New Issue