os: implement os.Symlink and os.Readlink

src/os/os_symlink_test.go

@@ -0,0 +1,75 @@
+// +build !windows,!baremetal,!js,!wasi
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os_test
+
+import (
+	. "os"
+	"testing"
+)
+
+// TODO: Move this back into os_anyos_test.go when wasi supports symlink
+
+func TestSymlink(t *testing.T) {
+	//testenv.MustHaveSymlink(t)
+
+	defer chtmpdir(t)()
+	from, to := "symlinktestfrom", "symlinktestto"
+	file, err := Create(to)
+	if err != nil {
+		t.Fatalf("Create(%q) failed: %v", to, err)
+	}
+	if err = file.Close(); err != nil {
+		t.Errorf("Close(%q) failed: %v", to, err)
+	}
+	err = Symlink(to, from)
+	if err != nil {
+		t.Fatalf("Symlink(%q, %q) failed: %v", to, from, err)
+	}
+	tostat, err := Lstat(to)
+	if err != nil {
+		t.Fatalf("Lstat(%q) failed: %v", to, err)
+	}
+	if tostat.Mode()&ModeSymlink != 0 {
+		t.Fatalf("Lstat(%q).Mode()&ModeSymlink = %v, want 0", to, tostat.Mode()&ModeSymlink)
+	}
+	fromstat, err := Stat(from)
+	if err != nil {
+		t.Fatalf("Stat(%q) failed: %v", from, err)
+	}
+	if !SameFile(tostat, fromstat) {
+		t.Errorf("Symlink(%q, %q) did not create symlink", to, from)
+	}
+	fromstat, err = Lstat(from)
+	if err != nil {
+		t.Fatalf("Lstat(%q) failed: %v", from, err)
+	}
+	if fromstat.Mode()&ModeSymlink == 0 {
+		t.Fatalf("Lstat(%q).Mode()&ModeSymlink = 0, want %v", from, ModeSymlink)
+	}
+	fromstat, err = Stat(from)
+	if err != nil {
+		t.Fatalf("Stat(%q) failed: %v", from, err)
+	}
+	if fromstat.Name() != from {
+		t.Errorf("Stat(%q).Name() = %q, want %q", from, fromstat.Name(), from)
+	}
+	if fromstat.Mode()&ModeSymlink != 0 {
+		t.Fatalf("Stat(%q).Mode()&ModeSymlink = %v, want 0", from, fromstat.Mode()&ModeSymlink)
+	}
+	s, err := Readlink(from)
+	if err != nil {
+		t.Fatalf("Readlink(%q) failed: %v", from, err)
+	}
+	if s != to {
+		t.Fatalf("Readlink(%q) = %q, want %q", from, s, to)
+	}
+	file, err = Open(from)
+	if err != nil {
+		t.Fatalf("Open(%q) failed: %v", from, err)
+	}
+	file.Close()
+}