DockerCLI/vendor/github.com/tonistiigi/fsutil/fs.go

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package fsutil
import (
"context"
"io"
"os"
"path"
"path/filepath"
"strings"
"github.com/pkg/errors"
)
type FS interface {
Walk(context.Context, filepath.WalkFunc) error
Open(string) (io.ReadCloser, error)
}
func NewFS(root string, opt *WalkOpt) FS {
return &fs{
root: root,
opt: opt,
}
}
type fs struct {
root string
opt *WalkOpt
}
func (fs *fs) Walk(ctx context.Context, fn filepath.WalkFunc) error {
return Walk(ctx, fs.root, fs.opt, fn)
}
func (fs *fs) Open(p string) (io.ReadCloser, error) {
return os.Open(filepath.Join(fs.root, p))
}
func SubDirFS(fs FS, stat Stat) FS {
return &subDirFS{fs: fs, stat: stat}
}
type subDirFS struct {
fs FS
stat Stat
}
func (fs *subDirFS) Walk(ctx context.Context, fn filepath.WalkFunc) error {
main := &StatInfo{Stat: &fs.stat}
if !main.IsDir() {
return errors.Errorf("fs subdir not mode directory")
}
if main.Name() != fs.stat.Path {
return errors.Errorf("subdir path must be single file")
}
if err := fn(fs.stat.Path, main, nil); err != nil {
return err
}
return fs.fs.Walk(ctx, func(p string, fi os.FileInfo, err error) error {
stat, ok := fi.Sys().(*Stat)
if !ok {
return errors.Wrapf(err, "invalid fileinfo without stat info: %s", p)
}
stat.Path = path.Join(fs.stat.Path, stat.Path)
return fn(filepath.Join(fs.stat.Path, p), &StatInfo{stat}, nil)
})
}
func (fs *subDirFS) Open(p string) (io.ReadCloser, error) {
return fs.fs.Open(strings.TrimPrefix(p, fs.stat.Path+"/"))
}