os: implement MkdirAll

src/os/path_windows_test.go

@@ -0,0 +1,75 @@
+// Copyright 2016 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"
+	"strings"
+	"syscall"
+	"testing"
+)
+
+func TestFixLongPath(t *testing.T) {
+	if os.CanUseLongPaths {
+		return
+	}
+	// 248 is long enough to trigger the longer-than-248 checks in
+	// fixLongPath, but short enough not to make a path component
+	// longer than 255, which is illegal on Windows. (which
+	// doesn't really matter anyway, since this is purely a string
+	// function we're testing, and it's not actually being used to
+	// do a system call)
+	veryLong := "l" + strings.Repeat("o", 248) + "ng"
+	for _, test := range []struct{ in, want string }{
+		// Short; unchanged:
+		{`C:\short.txt`, `C:\short.txt`},
+		{`C:\`, `C:\`},
+		{`C:`, `C:`},
+		// The "long" substring is replaced by a looooooong
+		// string which triggers the rewriting. Except in the
+		// cases below where it doesn't.
+		{`C:\long\foo.txt`, `\\?\C:\long\foo.txt`},
+		{`C:/long/foo.txt`, `\\?\C:\long\foo.txt`},
+		{`C:\long\foo\\bar\.\baz\\`, `\\?\C:\long\foo\bar\baz`},
+		{`\\unc\path`, `\\unc\path`},
+		{`long.txt`, `long.txt`},
+		{`C:long.txt`, `C:long.txt`},
+		{`c:\long\..\bar\baz`, `c:\long\..\bar\baz`},
+		{`\\?\c:\long\foo.txt`, `\\?\c:\long\foo.txt`},
+		{`\\?\c:\long/foo.txt`, `\\?\c:\long/foo.txt`},
+	} {
+		in := strings.ReplaceAll(test.in, "long", veryLong)
+		want := strings.ReplaceAll(test.want, "long", veryLong)
+		if got := os.FixLongPath(in); got != want {
+			got = strings.ReplaceAll(got, veryLong, "long")
+			t.Errorf("fixLongPath(%q) = %q; want %q", test.in, got, test.want)
+		}
+	}
+}
+
+// TODO: bring back upstream version's TestMkdirAllLongPath once os.RemoveAll and t.TempDir implemented
+
+func TestMkdirAllExtendedLength(t *testing.T) {
+	// TODO: revert to upstream version once os.RemoveAll and t.TempDir implemented
+	tmpDir := os.TempDir()
+
+	const prefix = `\\?\`
+	if len(tmpDir) < 4 || tmpDir[:4] != prefix {
+		fullPath, err := syscall.FullPath(tmpDir)
+		if err != nil {
+			t.Fatalf("FullPath(%q) fails: %v", tmpDir, err)
+		}
+		tmpDir = prefix + fullPath
+	}
+	path := tmpDir + `\dir\`
+	if err := os.MkdirAll(path, 0777); err != nil {
+		t.Fatalf("MkdirAll(%q) failed: %v", path, err)
+	}
+
+	path = path + `.\dir2`
+	if err := os.MkdirAll(path, 0777); err == nil {
+		t.Fatalf("MkdirAll(%q) should have failed, but did not", path)
+	}
+}