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package fsutil
import (
"context"
"io"
gofs "io/fs"
"os"
"syscall"
"github.com/pkg/errors"
"github.com/tonistiigi/fsutil/types"
)
// Hardlinks validates that all targets for links were part of the changes
type Hardlinks struct {
seenFiles map[string]struct{}
}
func (v *Hardlinks) HandleChange(kind ChangeKind, p string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
if v.seenFiles == nil {
v.seenFiles = make(map[string]struct{})
}
if kind == ChangeKindDelete {
return nil
}
stat, ok := fi.Sys().(*types.Stat)
if !ok {
return errors.WithStack(&os.PathError{Path: p, Err: syscall.EBADMSG, Op: "change without stat info"})
}
if fi.IsDir() || fi.Mode()&os.ModeSymlink != 0 {
return nil
}
if len(stat.Linkname) > 0 {
if _, ok := v.seenFiles[stat.Linkname]; !ok {
return errors.Errorf("invalid link %s to unknown path: %q", p, stat.Linkname)
}
} else {
v.seenFiles[p] = struct{}{}
}
return nil
}
// WithHardlinkReset returns a FS that fixes hardlinks for FS that has been filtered
// so that original hardlink sources might be missing
func WithHardlinkReset(fs FS) FS {
return &hardlinkFilter{fs: fs}
}
type hardlinkFilter struct {
fs FS
}
var _ FS = &hardlinkFilter{}
func (r *hardlinkFilter) Walk(ctx context.Context, target string, fn gofs.WalkDirFunc) error {
seenFiles := make(map[string]string)
return r.fs.Walk(ctx, target, func(path string, entry gofs.DirEntry, err error) error {
if err != nil {
return err
}
fi, err := entry.Info()
if err != nil {
return err
}
if fi.IsDir() || fi.Mode()&os.ModeSymlink != 0 {
return fn(path, entry, nil)
}
stat, ok := fi.Sys().(*types.Stat)
if !ok {
return errors.WithStack(&os.PathError{Path: path, Err: syscall.EBADMSG, Op: "fileinfo without stat info"})
}
if stat.Linkname != "" {
if v, ok := seenFiles[stat.Linkname]; !ok {
seenFiles[stat.Linkname] = stat.Path
stat.Linkname = ""
entry = &dirEntryWithStat{DirEntry: entry, stat: stat}
} else {
if v != stat.Path {
stat.Linkname = v
entry = &dirEntryWithStat{DirEntry: entry, stat: stat}
}
}
}
seenFiles[path] = stat.Path
return fn(path, entry, nil)
})
}
func (r *hardlinkFilter) Open(p string) (io.ReadCloser, error) {
return r.fs.Open(p)
}
type dirEntryWithStat struct {
gofs.DirEntry
stat *types.Stat
}
func (d *dirEntryWithStat) Info() (gofs.FileInfo, error) {
return &StatInfo{d.stat}, nil
}
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