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package fakecontext // import "github.com/docker/docker/testutil/fakecontext"
import (
"bytes"
"io"
"os"
"path/filepath"
"testing"
"github.com/docker/docker/pkg/archive"
)
// New creates a fake build context
func New(t testing.TB, dir string, modifiers ...func(*Fake) error) *Fake {
t.Helper()
fakeContext := &Fake{Dir: dir}
if dir == "" {
if err := newDir(fakeContext); err != nil {
t.Fatal(err)
}
}
for _, modifier := range modifiers {
if err := modifier(fakeContext); err != nil {
t.Fatal(err)
}
}
return fakeContext
}
func newDir(fake *Fake) error {
tmp, err := os.MkdirTemp("", "fake-context")
if err != nil {
return err
}
if err := os.Chmod(tmp, 0o755); err != nil {
return err
}
fake.Dir = tmp
return nil
}
// WithFile adds the specified file (with content) in the build context
func WithFile(name, content string) func(*Fake) error {
return func(ctx *Fake) error {
return ctx.Add(name, content)
}
}
// WithDockerfile adds the specified content as Dockerfile in the build context
func WithDockerfile(content string) func(*Fake) error {
return WithFile("Dockerfile", content)
}
// WithFiles adds the specified files in the build context, content is a string
func WithFiles(files map[string]string) func(*Fake) error {
return func(fakeContext *Fake) error {
for file, content := range files {
if err := fakeContext.Add(file, content); err != nil {
return err
}
}
return nil
}
}
// WithBinaryFiles adds the specified files in the build context, content is binary
func WithBinaryFiles(files map[string]*bytes.Buffer) func(*Fake) error {
return func(fakeContext *Fake) error {
for file, content := range files {
if err := fakeContext.Add(file, content.String()); err != nil {
return err
}
}
return nil
}
}
// Fake creates directories that can be used as a build context
type Fake struct {
Dir string
}
// Add a file at a path, creating directories where necessary
func (f *Fake) Add(file, content string) error {
return f.addFile(file, []byte(content))
}
func (f *Fake) addFile(file string, content []byte) error {
fp := filepath.Join(f.Dir, filepath.FromSlash(file))
dirpath := filepath.Dir(fp)
if dirpath != "." {
if err := os.MkdirAll(dirpath, 0o755); err != nil {
return err
}
}
return os.WriteFile(fp, content, 0o644)
}
// Delete a file at a path
func (f *Fake) Delete(file string) error {
fp := filepath.Join(f.Dir, filepath.FromSlash(file))
return os.RemoveAll(fp)
}
// Close deletes the context
func (f *Fake) Close() error {
return os.RemoveAll(f.Dir)
}
// AsTarReader returns a ReadCloser with the contents of Dir as a tar archive.
func (f *Fake) AsTarReader(t testing.TB) io.ReadCloser {
t.Helper()
reader, err := archive.TarWithOptions(f.Dir, &archive.TarOptions{})
if err != nil {
t.Fatalf("Failed to create tar from %s: %s", f.Dir, err)
}
return reader
}
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