94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
package nfs
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import (
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"bytes"
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"context"
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"os"
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"github.com/go-git/go-billy/v5"
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"github.com/willscott/go-nfs-client/nfs/xdr"
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)
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// Backing billy.FS doesn't support hard links
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func onLink(ctx context.Context, w *response, userHandle Handler) error {
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w.errorFmt = wccDataErrorFormatter
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obj := DirOpArg{}
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err := xdr.Read(w.req.Body, &obj)
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if err != nil {
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return &NFSStatusError{NFSStatusInval, err}
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}
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attrs, err := ReadSetFileAttributes(w.req.Body)
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if err != nil {
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return &NFSStatusError{NFSStatusInval, err}
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}
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target, err := xdr.ReadOpaque(w.req.Body)
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if err != nil {
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return &NFSStatusError{NFSStatusInval, err}
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}
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fs, path, err := userHandle.FromHandle(obj.Handle)
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if err != nil {
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return &NFSStatusError{NFSStatusStale, err}
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}
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if !CapabilityCheck(fs, billy.WriteCapability) {
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return &NFSStatusError{NFSStatusROFS, os.ErrPermission}
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}
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if len(string(obj.Filename)) > PathNameMax {
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return &NFSStatusError{NFSStatusNameTooLong, os.ErrInvalid}
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}
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newFilePath := fs.Join(append(path, string(obj.Filename))...)
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if _, err := fs.Stat(ctx, newFilePath); err == nil {
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return &NFSStatusError{NFSStatusExist, os.ErrExist}
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}
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if s, err := fs.Stat(ctx, fs.Join(path...)); err != nil {
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return &NFSStatusError{NFSStatusAccess, err}
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} else if !s.IsDir() {
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return &NFSStatusError{NFSStatusNotDir, nil}
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}
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fp := userHandle.ToHandle(fs, append(path, string(obj.Filename)))
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changer := userHandle.Change(fs)
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if changer == nil {
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return &NFSStatusError{NFSStatusAccess, err}
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}
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cos, ok := changer.(UnixChange)
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if !ok {
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return &NFSStatusError{NFSStatusAccess, err}
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}
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err = cos.Link(ctx, string(target), newFilePath)
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if err != nil {
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return &NFSStatusError{NFSStatusAccess, err}
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}
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if err := attrs.Apply(ctx, changer, fs, newFilePath); err != nil {
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return &NFSStatusError{NFSStatusIO, err}
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}
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writer := bytes.NewBuffer([]byte{})
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if err := xdr.Write(writer, uint32(NFSStatusOk)); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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// "handle follows"
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if err := xdr.Write(writer, uint32(1)); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := xdr.Write(writer, fp); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := WritePostOpAttrs(writer, tryStat(ctx, fs, append(path, string(obj.Filename)))); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := WriteWcc(writer, nil, tryStat(ctx, fs, path)); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := w.Write(writer.Bytes()); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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return nil
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}
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