os: Implement symlink support for Windows

Fixes #5750.

https://code.google.com/p/go/issues/detail?id=5750

os: Separate windows from posix. Implement windows support.
path/filepath: Use the same implementation as other platforms
syscall: Add/rework new APIs for Windows

LGTM=alex.brainman
R=golang-codereviews, alex.brainman, gobot, rsc, minux
CC=golang-codereviews
https://golang.org/cl/86160044

1 files changed, 20 insertions, 0 deletions

diff --git a/src/pkg/os/file_unix.go b/src/pkg/os/file_unix.go
index 23d5f65360..bba0d9c0f6 100644
--- a/src/pkg/os/file_unix.go
+++ b/src/pkg/os/file_unix.go
@@ -316,3 +316,23 @@ func TempDir() string {
 	}
 	return dir
 }
+
+// Link creates newname as a hard link to the oldname file.
+// If there is an error, it will be of type *LinkError.
+func Link(oldname, newname string) error {
+	e := syscall.Link(oldname, newname)
+	if e != nil {
+		return &LinkError{"link", oldname, newname, e}
+	}
+	return nil
+}
+
+// Symlink creates newname as a symbolic link to oldname.
+// If there is an error, it will be of type *LinkError.
+func Symlink(oldname, newname string) error {
+	e := syscall.Symlink(oldname, newname)
+	if e != nil {
+		return &LinkError{"symlink", oldname, newname, e}
+	}
+	return nil
+}