mirror of https://github.com/docker/cli.git
130 lines
2.6 KiB
Go
130 lines
2.6 KiB
Go
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package fs
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import (
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/pkg/errors"
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"gotest.tools/assert"
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)
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// Manifest stores the expected structure and properties of files and directories
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// in a filesystem.
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type Manifest struct {
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root *directory
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}
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type resource struct {
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mode os.FileMode
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uid uint32
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gid uint32
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}
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type file struct {
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resource
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content io.ReadCloser
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}
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func (f *file) Type() string {
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return "file"
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}
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type symlink struct {
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resource
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target string
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}
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func (f *symlink) Type() string {
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return "symlink"
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}
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type directory struct {
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resource
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items map[string]dirEntry
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}
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func (f *directory) Type() string {
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return "directory"
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}
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type dirEntry interface {
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Type() string
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}
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// ManifestFromDir creates a Manifest by reading the directory at path. The
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// manifest stores the structure and properties of files in the directory.
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// ManifestFromDir can be used with Equal to compare two directories.
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func ManifestFromDir(t assert.TestingT, path string) Manifest {
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if ht, ok := t.(helperT); ok {
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ht.Helper()
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}
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manifest, err := manifestFromDir(path)
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assert.NilError(t, err)
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return manifest
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}
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func manifestFromDir(path string) (Manifest, error) {
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info, err := os.Stat(path)
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switch {
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case err != nil:
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return Manifest{}, err
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case !info.IsDir():
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return Manifest{}, errors.Errorf("path %s must be a directory", path)
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}
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directory, err := newDirectory(path, info)
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return Manifest{root: directory}, err
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}
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func newDirectory(path string, info os.FileInfo) (*directory, error) {
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items := make(map[string]dirEntry)
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children, err := ioutil.ReadDir(path)
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if err != nil {
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return nil, err
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}
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for _, child := range children {
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fullPath := filepath.Join(path, child.Name())
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items[child.Name()], err = getTypedResource(fullPath, child)
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if err != nil {
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return nil, err
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}
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}
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return &directory{
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resource: newResourceFromInfo(info),
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items: items,
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}, nil
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}
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func getTypedResource(path string, info os.FileInfo) (dirEntry, error) {
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switch {
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case info.IsDir():
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return newDirectory(path, info)
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case info.Mode()&os.ModeSymlink != 0:
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return newSymlink(path, info)
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// TODO: devices, pipes?
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default:
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return newFile(path, info)
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}
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}
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func newSymlink(path string, info os.FileInfo) (*symlink, error) {
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target, err := os.Readlink(path)
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return &symlink{
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resource: newResourceFromInfo(info),
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target: target,
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}, err
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}
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func newFile(path string, info os.FileInfo) (*file, error) {
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// TODO: defer file opening to reduce number of open FDs?
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readCloser, err := os.Open(path)
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return &file{
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resource: newResourceFromInfo(info),
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content: readCloser,
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}, err
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}
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