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Signed-off-by: Lei Jitang <leijitang@huawei.com>
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// Copyright 2016 The Linux Foundation | ||
// | ||
// 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. | ||
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package image | ||
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import ( | ||
"archive/tar" | ||
"fmt" | ||
"io" | ||
"io/ioutil" | ||
"os" | ||
"os/exec" | ||
"path/filepath" | ||
"strings" | ||
"testing" | ||
) | ||
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func TestCreateFilesystemChangeset(t *testing.T) { | ||
// create base fileystem | ||
tmp1, err := ioutil.TempDir("", "test-layer") | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
//defer os.RemoveAll(tmp1) | ||
basepath := filepath.Join(tmp1, "base") | ||
err = os.MkdirAll(basepath, 0700) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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// get the file list of base layer | ||
expectedFiles := map[string]bool{ | ||
"bin/": true, | ||
"bin/app": true, | ||
"bin/test": true, | ||
"bin/tool": true, | ||
"etc/": true, | ||
"etc/app.cfg": true, | ||
"etc/tool.cfg.d/": true, | ||
"etc/tool.cfg.d/tool.cfg": true, | ||
} | ||
err = createFilesystem(basepath, expectedFiles, nil) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
// create base layer | ||
tarfile := filepath.Join(tmp1, "base.tar") | ||
err = CreateLayer(basepath, "", tarfile) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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files, err := listTarFiles(tarfile) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
// verify base layer has packed all the file | ||
// and no expected file are packed. | ||
err = verify(expectedFiles, files) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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// create a identical copy of base | ||
snapshot1path := filepath.Join(tmp1, "base.s1") | ||
cpCmd := exec.Command("cp", "-a", basepath, snapshot1path) | ||
err = cpCmd.Run() | ||
if err != nil { | ||
t.Fatalf("fail to cp: %v", err) | ||
} | ||
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// delete some file and add some file in base.s1 | ||
layer1FilesDiff := map[string]bool{ | ||
"bin/tool": false, | ||
"bin/app.tool": true, | ||
"etc/app.cfg": false, | ||
"etc/tool.cfg.d/": false, | ||
"etc/app.cfg.d/": true, | ||
"etc/app.tool.cfg": true, | ||
"etc/app.cfg.d/app.cfg": true, | ||
} | ||
modifiedfiles := map[string]func(string) error{ | ||
"bin/app": func(path string) error { | ||
err := ioutil.WriteFile(path, []byte(fmt.Sprintf("Hello world")), 0755) | ||
return err | ||
}, | ||
} | ||
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err = createFilesystem(snapshot1path, layer1FilesDiff, modifiedfiles) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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// create layer diff | ||
tarfile1 := filepath.Join(tmp1, "base.s1.tar") | ||
err = CreateLayer(snapshot1path, basepath, tarfile1) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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execptedfiles := map[string]bool{ | ||
"bin/": true, | ||
"bin/app": true, | ||
"bin/app.tool": true, | ||
"bin/.wh.tool": true, | ||
"etc/": true, | ||
"etc/.wh.app.cfg": true, | ||
"etc/app.cfg.d/": true, | ||
"etc/app.cfg.d/app.cfg": true, | ||
"etc/app.tool.cfg": true, | ||
"etc/.wh.tool.cfg.d": true, | ||
} | ||
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actualfile, err := listTarFiles(tarfile1) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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// verify if CreateLayer has created expected filesystem changeset | ||
err = verify(execptedfiles, actualfile) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
} | ||
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func createFilesystem(path string, files map[string]bool, modify map[string]func(string) error) error { | ||
for f, add := range files { | ||
// add file | ||
if add { | ||
// create a directory | ||
if strings.HasSuffix(f, "/") { | ||
err := os.MkdirAll(filepath.Join(path, f), 0700) | ||
if err != nil { | ||
return err | ||
} | ||
} else { // create file | ||
file := filepath.Join(path, f) | ||
err := os.MkdirAll(filepath.Dir(file), 0700) | ||
if err != nil { | ||
return err | ||
} | ||
_, err = os.Create(file) | ||
if err != nil { | ||
return err | ||
} | ||
} | ||
} else { // remove file | ||
file := filepath.Join(path, f) | ||
err := os.RemoveAll(file) | ||
if err != nil { | ||
return err | ||
} | ||
} | ||
} | ||
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// apply file modify | ||
for f, fun := range modify { | ||
err := fun(filepath.Join(path, f)) | ||
if err != nil { | ||
return err | ||
} | ||
} | ||
return nil | ||
} | ||
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func verify(m1 map[string]bool, m2 map[string]bool) error { | ||
for f, _ := range m1 { | ||
if _, ok := m2[f]; !ok { | ||
return fmt.Errorf("expected file %v not exist", f) | ||
} | ||
} | ||
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for f, _ := range m2 { | ||
if _, ok := m1[f]; !ok { | ||
return fmt.Errorf("%v is not an expected file", f) | ||
} | ||
} | ||
return nil | ||
} | ||
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func listTarFiles(path string) (map[string]bool, error) { | ||
var files = make(map[string]bool) | ||
file, err := os.Open(path) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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tr := tar.NewReader(file) | ||
for { | ||
hdr, err := tr.Next() | ||
if err == io.EOF { | ||
break | ||
} | ||
if err != nil { | ||
return nil, err | ||
} | ||
files[hdr.Name] = true | ||
} | ||
return files, nil | ||
} |