| 1 | //go:build !windows |
| 2 | |
| 3 | package sandbox |
| 4 | |
| 5 | import ( |
| 6 | "os" |
| 7 | "path/filepath" |
| 8 | "slices" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | // outsideHostDirs plans as if the test's temp tree were no host write |
| 13 | // directory, which it is on macOS. |
| 14 | func outsideHostDirs(t *testing.T) { |
| 15 | t.Helper() |
| 16 | prev := hostWritePins |
| 17 | hostWritePins = func() hostPins { return nil } |
| 18 | t.Cleanup(func() { hostWritePins = prev }) |
| 19 | } |
| 20 | |
| 21 | func planDir(t *testing.T, path string) string { |
| 22 | t.Helper() |
| 23 | if err := os.MkdirAll(path, 0o755); err != nil { |
| 24 | t.Fatal(err) |
| 25 | } |
| 26 | real, err := filepath.EvalSymlinks(path) |
| 27 | if err != nil { |
| 28 | t.Fatal(err) |
| 29 | } |
| 30 | return real |
| 31 | } |
| 32 | |
| 33 | func planLink(t *testing.T, target, link string) { |
| 34 | t.Helper() |
| 35 | if err := os.Symlink(target, link); err != nil { |
| 36 | t.Fatal(err) |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | func TestPlanRefusesARootReachedThroughALinkInAWritableDir(t *testing.T) { |
| 41 | base := t.TempDir() |
| 42 | ws := planDir(t, filepath.Join(base, "ws")) |
| 43 | outside := planDir(t, filepath.Join(base, "outside")) |
| 44 | planDir(t, filepath.Join(outside, "b")) |
| 45 | later, nested := filepath.Join(ws, "later"), filepath.Join(ws, "a", "b") |
| 46 | planLink(t, outside, later) |
| 47 | planLink(t, outside, filepath.Join(ws, "a")) |
| 48 | plan := planWriteRoots([]string{ws, later, nested}, nil, "") |
| 49 | if !slices.Equal(plan.dirs, []string{ws}) || len(plan.refused) != 2 { |
| 50 | t.Fatalf("plan = %+v, want only the workspace", plan) |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | func TestPlanFollowsALinkNoConfinedCommandCanRewrite(t *testing.T) { |
| 55 | outsideHostDirs(t) |
| 56 | base := t.TempDir() |
| 57 | target := planDir(t, filepath.Join(base, "real")) |
| 58 | link := filepath.Join(base, "link") |
| 59 | planLink(t, target, link) |
| 60 | plan := planWriteRoots([]string{link}, nil, "") |
| 61 | if len(plan.refused) != 0 || !slices.Equal(plan.dirs, []string{target}) { |
| 62 | t.Fatalf("plan = %+v, want the link's target", plan) |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | func TestPlanARootRepointedAtTheRootDirectoryRefusesNoOther(t *testing.T) { |
| 67 | outsideHostDirs(t) |
| 68 | base := t.TempDir() |
| 69 | ws := planDir(t, filepath.Join(base, "ws")) |
| 70 | target := planDir(t, filepath.Join(base, "real")) |
| 71 | link := filepath.Join(base, "link") |
| 72 | planLink(t, target, link) |
| 73 | later := filepath.Join(ws, "later") |
| 74 | planLink(t, "/", later) |
| 75 | plan := planWriteRoots([]string{ws, later, link}, nil, "") |
| 76 | if !slices.Equal(plan.dirs, []string{ws, target}) || len(plan.refused) != 1 { |
| 77 | t.Fatalf("plan = %+v, want only the re-pointed root refused", plan) |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | // A host cache's own entry is inside the grant it names, so a confined command |
| 82 | // can move it aside and leave a link there; the pinned identity refuses it. |
| 83 | func TestPlanRefusesAHostDirectoryWhoseOwnEntryBecameALink(t *testing.T) { |
| 84 | base := t.TempDir() |
| 85 | ws := planDir(t, filepath.Join(base, "ws")) |
| 86 | cache := planDir(t, filepath.Join(base, "home", ".cache")) |
| 87 | gopath := planDir(t, filepath.Join(base, "home", "go")) |
| 88 | agents := planDir(t, filepath.Join(base, "home", "Library", "LaunchAgents")) |
| 89 | prev := hostWritePins |
| 90 | pins := hostPins{} |
| 91 | for _, d := range []string{cache, gopath} { |
| 92 | info, _ := os.Stat(d) |
| 93 | pins[d] = hostIdentity{path: d, info: info} |
| 94 | } |
| 95 | hostWritePins = func() hostPins { return pins } |
| 96 | t.Cleanup(func() { hostWritePins = prev }) |
| 97 | if err := os.Rename(gopath, filepath.Join(cache, "stash")); err != nil { |
| 98 | t.Fatal(err) |
| 99 | } |
| 100 | planLink(t, agents, gopath) |
| 101 | plan := planWriteRoots([]string{ws}, []string{cache, gopath}, "") |
| 102 | if slices.Contains(plan.dirs, agents) || len(plan.refused) != 1 { |
| 103 | t.Fatalf("plan = %+v, want the re-pointed cache refused", plan) |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | func TestHostWriteDirectoriesPinOnlyTheirPath(t *testing.T) { |
| 108 | for key, id := range pinHostWriteDirs() { |
| 109 | if id.info != nil { |
| 110 | t.Fatalf("%s pins a file identity; a cache rebuilt in place would be refused", key) |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 |