DockerCLI/cli/command/image/build/context_test.go

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package build
import (
"archive/tar"
"bytes"
"io"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"strings"
"testing"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const dockerfileContents = "FROM busybox"
var prepareEmpty = func(t *testing.T) (string, func()) {
return "", func() {}
}
var prepareNoFiles = func(t *testing.T) (string, func()) {
return createTestTempDir(t, "", "builder-context-test")
}
var prepareOneFile = func(t *testing.T) (string, func()) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents, 0777)
return contextDir, cleanup
}
func testValidateContextDirectory(t *testing.T, prepare func(t *testing.T) (string, func()), excludes []string) {
contextDir, cleanup := prepare(t)
defer cleanup()
err := ValidateContextDirectory(contextDir, excludes)
require.NoError(t, err)
}
func TestGetContextFromLocalDirNoDockerfile(t *testing.T) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
defer cleanup()
_, _, err := GetContextFromLocalDir(contextDir, "")
testutil.ErrorContains(t, err, "Dockerfile")
}
func TestGetContextFromLocalDirNotExistingDir(t *testing.T) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
defer cleanup()
fakePath := filepath.Join(contextDir, "fake")
_, _, err := GetContextFromLocalDir(fakePath, "")
testutil.ErrorContains(t, err, "fake")
}
func TestGetContextFromLocalDirNotExistingDockerfile(t *testing.T) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
defer cleanup()
fakePath := filepath.Join(contextDir, "fake")
_, _, err := GetContextFromLocalDir(contextDir, fakePath)
testutil.ErrorContains(t, err, "fake")
}
func TestGetContextFromLocalDirWithNoDirectory(t *testing.T) {
contextDir, dirCleanup := createTestTempDir(t, "", "builder-context-test")
defer dirCleanup()
createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents, 0777)
chdirCleanup := chdir(t, contextDir)
defer chdirCleanup()
absContextDir, relDockerfile, err := GetContextFromLocalDir(contextDir, "")
require.NoError(t, err)
assert.Equal(t, contextDir, absContextDir)
assert.Equal(t, DefaultDockerfileName, relDockerfile)
}
func TestGetContextFromLocalDirWithDockerfile(t *testing.T) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
defer cleanup()
createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents, 0777)
absContextDir, relDockerfile, err := GetContextFromLocalDir(contextDir, "")
require.NoError(t, err)
assert.Equal(t, contextDir, absContextDir)
assert.Equal(t, DefaultDockerfileName, relDockerfile)
}
func TestGetContextFromLocalDirLocalFile(t *testing.T) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
defer cleanup()
createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents, 0777)
testFilename := createTestTempFile(t, contextDir, "tmpTest", "test", 0777)
absContextDir, relDockerfile, err := GetContextFromLocalDir(testFilename, "")
if err == nil {
t.Fatalf("Error should not be nil")
}
if absContextDir != "" {
t.Fatalf("Absolute directory path should be empty, got: %s", absContextDir)
}
if relDockerfile != "" {
t.Fatalf("Relative path to Dockerfile should be empty, got: %s", relDockerfile)
}
}
func TestGetContextFromLocalDirWithCustomDockerfile(t *testing.T) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
defer cleanup()
chdirCleanup := chdir(t, contextDir)
defer chdirCleanup()
createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents, 0777)
absContextDir, relDockerfile, err := GetContextFromLocalDir(contextDir, DefaultDockerfileName)
require.NoError(t, err)
assert.Equal(t, contextDir, absContextDir)
assert.Equal(t, DefaultDockerfileName, relDockerfile)
}
func TestGetContextFromReaderString(t *testing.T) {
tarArchive, relDockerfile, err := GetContextFromReader(ioutil.NopCloser(strings.NewReader(dockerfileContents)), "")
if err != nil {
t.Fatalf("Error when executing GetContextFromReader: %s", err)
}
tarReader := tar.NewReader(tarArchive)
_, err = tarReader.Next()
if err != nil {
t.Fatalf("Error when reading tar archive: %s", err)
}
buff := new(bytes.Buffer)
buff.ReadFrom(tarReader)
contents := buff.String()
_, err = tarReader.Next()
if err != io.EOF {
t.Fatalf("Tar stream too long: %s", err)
}
require.NoError(t, tarArchive.Close())
if dockerfileContents != contents {
t.Fatalf("Uncompressed tar archive does not equal: %s, got: %s", dockerfileContents, contents)
}
if relDockerfile != DefaultDockerfileName {
t.Fatalf("Relative path not equals %s, got: %s", DefaultDockerfileName, relDockerfile)
}
}
func TestGetContextFromReaderTar(t *testing.T) {
contextDir, cleanup := createTestTempDir(t, "", "builder-context-test")
defer cleanup()
createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents, 0777)
tarStream, err := archive.Tar(contextDir, archive.Uncompressed)
require.NoError(t, err)
tarArchive, relDockerfile, err := GetContextFromReader(tarStream, DefaultDockerfileName)
require.NoError(t, err)
tarReader := tar.NewReader(tarArchive)
header, err := tarReader.Next()
require.NoError(t, err)
if header.Name != DefaultDockerfileName {
t.Fatalf("Dockerfile name should be: %s, got: %s", DefaultDockerfileName, header.Name)
}
buff := new(bytes.Buffer)
buff.ReadFrom(tarReader)
contents := buff.String()
_, err = tarReader.Next()
if err != io.EOF {
t.Fatalf("Tar stream too long: %s", err)
}
require.NoError(t, tarArchive.Close())
if dockerfileContents != contents {
t.Fatalf("Uncompressed tar archive does not equal: %s, got: %s", dockerfileContents, contents)
}
if relDockerfile != DefaultDockerfileName {
t.Fatalf("Relative path not equals %s, got: %s", DefaultDockerfileName, relDockerfile)
}
}
func TestValidateContextDirectoryEmptyContext(t *testing.T) {
// This isn't a valid test on Windows. See https://play.golang.org/p/RR6z6jxR81.
// The test will ultimately end up calling filepath.Abs(""). On Windows,
// golang will error. On Linux, golang will return /. Due to there being
// drive letters on Windows, this is probably the correct behaviour for
// Windows.
if runtime.GOOS == "windows" {
t.Skip("Invalid test on Windows")
}
testValidateContextDirectory(t, prepareEmpty, []string{})
}
func TestValidateContextDirectoryContextWithNoFiles(t *testing.T) {
testValidateContextDirectory(t, prepareNoFiles, []string{})
}
func TestValidateContextDirectoryWithOneFile(t *testing.T) {
testValidateContextDirectory(t, prepareOneFile, []string{})
}
func TestValidateContextDirectoryWithOneFileExcludes(t *testing.T) {
testValidateContextDirectory(t, prepareOneFile, []string{DefaultDockerfileName})
}
// createTestTempDir creates a temporary directory for testing.
// It returns the created path and a cleanup function which is meant to be used as deferred call.
// When an error occurs, it terminates the test.
func createTestTempDir(t *testing.T, dir, prefix string) (string, func()) {
path, err := ioutil.TempDir(dir, prefix)
require.NoError(t, err)
return path, func() { require.NoError(t, os.RemoveAll(path)) }
}
// createTestTempFile creates a temporary file within dir with specific contents and permissions.
// When an error occurs, it terminates the test
func createTestTempFile(t *testing.T, dir, filename, contents string, perm os.FileMode) string {
filePath := filepath.Join(dir, filename)
err := ioutil.WriteFile(filePath, []byte(contents), perm)
require.NoError(t, err)
return filePath
}
// chdir changes current working directory to dir.
// It returns a function which changes working directory back to the previous one.
// This function is meant to be executed as a deferred call.
// When an error occurs, it terminates the test.
func chdir(t *testing.T, dir string) func() {
workingDirectory, err := os.Getwd()
require.NoError(t, err)
require.NoError(t, os.Chdir(dir))
return func() { require.NoError(t, os.Chdir(workingDirectory)) }
}
func TestIsArchive(t *testing.T) {
var testcases = []struct {
doc string
header []byte
expected bool
}{
{
doc: "nil is not a valid header",
header: nil,
expected: false,
},
{
doc: "invalid header bytes",
header: []byte{0x00, 0x01, 0x02},
expected: false,
},
{
doc: "header for bzip2 archive",
header: []byte{0x42, 0x5A, 0x68},
expected: true,
},
{
doc: "header for 7zip archive is not supported",
header: []byte{0x50, 0x4b, 0x03, 0x04},
expected: false,
},
}
for _, testcase := range testcases {
assert.Equal(t, testcase.expected, IsArchive(testcase.header), testcase.doc)
}
}