forked from mirror/afero
adding support for Linker and LinkReader
This commit is contained in:
parent
819f7ad35d
commit
b4b149f834
26
basepath.go
26
basepath.go
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@ -177,4 +177,30 @@ func (b *BasePathFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
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return fi, false, err
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}
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func (b *BasePathFs) SymlinkIfPossible(oldname, newname string) error {
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oldname, err := b.RealPath(oldname)
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if err != nil {
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return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: err}
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}
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newname, err = b.RealPath(newname)
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if err != nil {
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return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: err}
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}
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if linker, ok := b.source.(Linker); ok {
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return linker.SymlinkIfPossible(oldname, newname)
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}
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return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink}
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}
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func (b *BasePathFs) ReadlinkIfPossible(name string) (string, error) {
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name, err := b.RealPath(name)
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if err != nil {
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return "", &os.PathError{Op: "readlink", Path: name, Err: err}
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}
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if reader, ok := b.source.(LinkReader); ok {
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return reader.ReadlinkIfPossible(name)
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}
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return "", &os.PathError{Op: "readlink", Path: name, Err: ErrNoReadlink}
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}
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// vim: ts=4 sw=4 noexpandtab nolist syn=go
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@ -117,6 +117,26 @@ func (u *CopyOnWriteFs) LstatIfPossible(name string) (os.FileInfo, bool, error)
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return fi, false, err
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}
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func (u *CopyOnWriteFs) SymlinkIfPossible(oldname, newname string) error {
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if slayer, ok := u.layer.(Linker); ok {
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return slayer.SymlinkIfPossible(oldname, newname)
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}
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return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink}
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}
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func (u *CopyOnWriteFs) ReadlinkIfPossible(name string) (string, error) {
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if rlayer, ok := u.layer.(LinkReader); ok {
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return rlayer.ReadlinkIfPossible(name)
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}
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if rbase, ok := u.base.(LinkReader); ok {
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return rbase.ReadlinkIfPossible(name)
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}
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return "", &os.PathError{Op: "readlink", Path: name, Err: ErrNoReadlink}
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}
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func (u *CopyOnWriteFs) isNotExist(err error) bool {
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if e, ok := err.(*os.PathError); ok {
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err = e.Err
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8
os.go
8
os.go
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@ -99,3 +99,11 @@ func (OsFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
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fi, err := os.Lstat(name)
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return fi, true, err
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}
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func (OsFs) SymlinkIfPossible(oldname, newname string) error {
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return os.Symlink(oldname, newname)
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}
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func (OsFs) ReadlinkIfPossible(name string) (string, error) {
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return os.Readlink(name)
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}
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@ -44,6 +44,18 @@ func (r *ReadOnlyFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
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return fi, false, err
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}
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func (r *ReadOnlyFs) SymlinkIfPossible(oldname, newname string) error {
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return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink}
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}
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func (r *ReadOnlyFs) ReadlinkIfPossible(name string) (string, error) {
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if srdr, ok := r.source.(LinkReader); ok {
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return srdr.ReadlinkIfPossible(name)
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}
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return "", &os.PathError{Op: "readlink", Path: name, Err: ErrNoReadlink}
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}
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func (r *ReadOnlyFs) Rename(o, n string) error {
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return syscall.EPERM
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}
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14
symlink.go
14
symlink.go
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@ -13,6 +13,10 @@
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package afero
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import (
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"errors"
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)
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// Symlinker is an optional interface in Afero. It is only implemented by the
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// filesystems saying so.
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// It indicates support for 3 symlink related interfaces that implement the
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@ -34,8 +38,18 @@ type Linker interface {
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SymlinkIfPossible(oldname, newname string) error
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}
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// ErrNoSymlink is the error that will be wrapped in an os.LinkError if a file system
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// does not support Symlink's either directly or through its delegated filesystem.
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// As expressed by support for the Linker interface.
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var ErrNoSymlink = errors.New("symlink not supported")
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// LinkReader is an optional interface in Afero. It is only implemented by the
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// filesystems saying so.
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type LinkReader interface {
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ReadlinkIfPossible(name string) (string, error)
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}
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// ErrNoReadlink is the error that will be wrapped in an os.Path if a file system
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// does not support the readlink operation either directly or through its delegated filesystem.
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// As expressed by support for the LinkReader interface.
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var ErrNoReadlink = errors.New("readlink not supported")
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