diff options
Diffstat (limited to 'runsc/container/fs_test.go')
| -rw-r--r-- | runsc/container/fs_test.go | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/runsc/container/fs_test.go b/runsc/container/fs_test.go new file mode 100644 index 000000000..84bde18fb --- /dev/null +++ b/runsc/container/fs_test.go @@ -0,0 +1,158 @@ +// Copyright 2018 Google Inc. +// +// 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 container + +import ( + "fmt" + "io/ioutil" + "os" + "path" + "path/filepath" + "testing" + + "gvisor.googlesource.com/gvisor/runsc/test/testutil" +) + +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(testutil.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(testutil.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") + } +} |