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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"testing"
)
func tmpDir() string {
dir := os.Getenv("TEST_TMPDIR")
if dir == "" {
dir = "/tmp"
}
return dir
}
type dir struct {
rel string
link string
}
func construct(root string, dirs []dir) error {
for _, d := range dirs {
p := path.Join(root, d.rel)
if d.link == "" {
if err := os.MkdirAll(p, 0755); err != nil {
return fmt.Errorf("error creating dir: %v", err)
}
} else {
if err := os.MkdirAll(path.Dir(p), 0755); err != nil {
return fmt.Errorf("error creating dir: %v", err)
}
if err := os.Symlink(d.link, p); err != nil {
return fmt.Errorf("error creating symlink: %v", err)
}
}
}
return nil
}
func TestResolveSymlinks(t *testing.T) {
root, err := ioutil.TempDir(tmpDir(), "root")
if err != nil {
t.Fatal("ioutil.TempDir() failed:", err)
}
dirs := []dir{
{"dir1/dir11/dir111/dir1111", ""}, // Just a boring dir
{"dir1/lnk12", "dir11"}, // Link to sibling
{"dir1/lnk13", "./dir11"}, // Link to sibling through self
{"dir1/lnk14", "../dir1/dir11"}, // Link to sibling through parent
{"dir1/dir15/lnk151", ".."}, // Link to parent
{"dir1/lnk16", "dir11/dir111"}, // Link to child
{"dir1/lnk17", "."}, // Link to self
{"dir1/lnk18", "lnk13"}, // Link to link
{"lnk2", "dir1/lnk13"}, // Link to link to link
{"dir3/dir21/lnk211", "../.."}, // Link to root relative
{"dir3/lnk22", "/"}, // Link to root absolute
{"dir3/lnk23", "/dir1"}, // Link to dir absolute
{"dir3/lnk24", "/dir1/lnk12"}, // Link to link absolute
{"lnk5", "../../.."}, // Link outside root
}
if err := construct(root, dirs); err != nil {
t.Fatal("construct failed:", err)
}
tests := []struct {
name string
rel string
want string
compareHost bool
}{
{name: "root", rel: "/", want: "/", compareHost: true},
{name: "basic dir", rel: "/dir1/dir11/dir111", want: "/dir1/dir11/dir111", compareHost: true},
{name: "dot 1", rel: "/dir1/dir11/./dir111", want: "/dir1/dir11/dir111", compareHost: true},
{name: "dot 2", rel: "/dir1/././dir11/./././././dir111/.", want: "/dir1/dir11/dir111", compareHost: true},
{name: "dotdot 1", rel: "/dir1/dir11/../dir15", want: "/dir1/dir15", compareHost: true},
{name: "dotdot 2", rel: "/dir1/dir11/dir1111/../..", want: "/dir1", compareHost: true},
{name: "link sibling", rel: "/dir1/lnk12", want: "/dir1/dir11", compareHost: true},
{name: "link sibling + dir", rel: "/dir1/lnk12/dir111", want: "/dir1/dir11/dir111", compareHost: true},
{name: "link sibling through self", rel: "/dir1/lnk13", want: "/dir1/dir11", compareHost: true},
{name: "link sibling through parent", rel: "/dir1/lnk14", want: "/dir1/dir11", compareHost: true},
{name: "link parent", rel: "/dir1/dir15/lnk151", want: "/dir1", compareHost: true},
{name: "link parent + dir", rel: "/dir1/dir15/lnk151/dir11", want: "/dir1/dir11", compareHost: true},
{name: "link child", rel: "/dir1/lnk16", want: "/dir1/dir11/dir111", compareHost: true},
{name: "link child + dir", rel: "/dir1/lnk16/dir1111", want: "/dir1/dir11/dir111/dir1111", compareHost: true},
{name: "link self", rel: "/dir1/lnk17", want: "/dir1", compareHost: true},
{name: "link self + dir", rel: "/dir1/lnk17/dir11", want: "/dir1/dir11", compareHost: true},
{name: "link^2", rel: "/dir1/lnk18", want: "/dir1/dir11", compareHost: true},
{name: "link^2 + dir", rel: "/dir1/lnk18/dir111", want: "/dir1/dir11/dir111", compareHost: true},
{name: "link^3", rel: "/lnk2", want: "/dir1/dir11", compareHost: true},
{name: "link^3 + dir", rel: "/lnk2/dir111", want: "/dir1/dir11/dir111", compareHost: true},
{name: "link abs", rel: "/dir3/lnk23", want: "/dir1"},
{name: "link abs + dir", rel: "/dir3/lnk23/dir11", want: "/dir1/dir11"},
{name: "link^2 abs", rel: "/dir3/lnk24", want: "/dir1/dir11"},
{name: "link^2 abs + dir", rel: "/dir3/lnk24/dir111", want: "/dir1/dir11/dir111"},
{name: "root link rel", rel: "/dir3/dir21/lnk211", want: "/", compareHost: true},
{name: "root link abs", rel: "/dir3/lnk22", want: "/"},
{name: "root contain link", rel: "/lnk5/dir1", want: "/dir1"},
{name: "root contain dotdot", rel: "/dir1/dir11/../../../../../../../..", want: "/"},
{name: "crazy", rel: "/dir3/dir21/lnk211/dir3/lnk22/dir1/dir11/../../lnk5/dir3/../dir3/lnk24/dir111/dir1111/..", want: "/dir1/dir11/dir111"},
}
for _, tst := range tests {
t.Run(tst.name, func(t *testing.T) {
got, err := resolveSymlinks(root, tst.rel)
if err != nil {
t.Errorf("resolveSymlinks(root, %q) failed: %v", tst.rel, err)
}
want := path.Join(root, tst.want)
if got != want {
t.Errorf("resolveSymlinks(root, %q) got: %q, want: %q", tst.rel, got, want)
}
if tst.compareHost {
// Check that host got to the same end result.
host, err := filepath.EvalSymlinks(path.Join(root, tst.rel))
if err != nil {
t.Errorf("path.EvalSymlinks(root, %q) failed: %v", tst.rel, err)
}
if host != got {
t.Errorf("resolveSymlinks(root, %q) got: %q, want: %q", tst.rel, host, got)
}
}
})
}
}
func TestResolveSymlinksLoop(t *testing.T) {
root, err := ioutil.TempDir(tmpDir(), "root")
if err != nil {
t.Fatal("ioutil.TempDir() failed:", err)
}
dirs := []dir{
{"loop1", "loop2"},
{"loop2", "loop1"},
}
if err := construct(root, dirs); err != nil {
t.Fatal("construct failed:", err)
}
if _, err := resolveSymlinks(root, "loop1"); err == nil {
t.Errorf("resolveSymlinks() should have failed")
}
}
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