| 1 | //go:build linux |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "errors" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | "strconv" |
| 10 | "testing" |
| 11 | |
| 12 | "github.com/carlosframework/platform/internal/stopevidence" |
| 13 | ) |
| 14 | |
| 15 | func TestRev4WritersPrefixCoverage(t *testing.T) { |
| 16 | for _, shape := range []string{"deleted-wal", "nested", "deleted-nested", "empty-directory"} { |
| 17 | t.Run(shape, func(t *testing.T) { |
| 18 | fx := newWritersKernelFixture(t) |
| 19 | fx.dropAgentHolds(t) |
| 20 | // No journal identity exists for a file first opened after launch. |
| 21 | fx.journal.Files = nil |
| 22 | target := fx.db + "-wal" |
| 23 | if shape == "nested" || shape == "deleted-nested" { |
| 24 | target = filepath.Join(filepath.Dir(fx.db), "sqlite", "later.db") |
| 25 | } |
| 26 | if err := os.MkdirAll(filepath.Dir(target), 0700); err != nil { |
| 27 | t.Fatal(err) |
| 28 | } |
| 29 | if err := os.WriteFile(target, nil, 0600); err != nil { |
| 30 | t.Fatal(err) |
| 31 | } |
| 32 | held, err := os.Open(target) |
| 33 | if err != nil { |
| 34 | t.Fatal(err) |
| 35 | } |
| 36 | defer held.Close() |
| 37 | if shape != "nested" { |
| 38 | if err := os.Remove(target); err != nil { |
| 39 | t.Fatal(err) |
| 40 | } |
| 41 | target += " (deleted)" |
| 42 | } |
| 43 | if shape == "empty-directory" { |
| 44 | if err := os.Remove(fx.db); err != nil { |
| 45 | t.Fatal(err) |
| 46 | } |
| 47 | } |
| 48 | // A real descriptor retains its inode after unlink, unlike a dangling fixture symlink. |
| 49 | pid := strconv.Itoa(os.Getpid()) |
| 50 | if err := os.Symlink(filepath.Join("/proc", pid), filepath.Join(fx.proc, pid)); err != nil { |
| 51 | t.Fatal(err) |
| 52 | } |
| 53 | if _, err := fx.verify(t); !errors.Is(err, stopevidence.ErrForeignHolder) { |
| 54 | t.Fatalf("foreign %s holder passed writers-stopped: %v", shape, err) |
| 55 | } |
| 56 | }) |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | func TestRev4WritersPrefixRetainsDescriptorIdentity(t *testing.T) { |
| 61 | fx := newWritersKernelFixture(t) |
| 62 | target := filepath.Join(filepath.Dir(fx.db), "sqlite", "later.db") |
| 63 | if err := os.MkdirAll(filepath.Dir(target), 0700); err != nil { |
| 64 | t.Fatal(err) |
| 65 | } |
| 66 | if err := os.WriteFile(target, nil, 0600); err != nil { |
| 67 | t.Fatal(err) |
| 68 | } |
| 69 | rev3HoldTarget(t, fx, 20, 8, target) |
| 70 | dev, ino := fileID(t, target) |
| 71 | fx.hints = append(fx.hints, stopevidence.DescriptorHint{FD: 8, Device: dev, Inode: ino}) |
| 72 | got, err := fx.verify(t) |
| 73 | if err != nil { |
| 74 | t.Fatal(err) |
| 75 | } |
| 76 | want := stopevidence.Descriptor{PID: 20, TID: 20, FD: 8, Device: dev, Inode: ino} |
| 77 | if len(got.Retained) != 2 || got.Retained[1] != want { |
| 78 | t.Fatalf("lost prefix descriptor identity: %+v", got.Retained) |
| 79 | } |
| 80 | fx.hints = fx.hints[:1] |
| 81 | if _, err := fx.verify(t); !errors.Is(err, stopevidence.ErrForeignHolder) { |
| 82 | t.Fatalf("unhinted prefix: %v", err) |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | func TestRev4WritersPrefixBoundaryAndScanErrors(t *testing.T) { |
| 87 | t.Run("sibling", func(t *testing.T) { |
| 88 | fx := newWritersKernelFixture(t) |
| 89 | target := filepath.Join(filepath.Dir(fx.db)+"-old", "other.db") |
| 90 | if err := os.MkdirAll(filepath.Dir(target), 0700); err != nil { |
| 91 | t.Fatal(err) |
| 92 | } |
| 93 | if err := os.WriteFile(target, nil, 0600); err != nil { |
| 94 | t.Fatal(err) |
| 95 | } |
| 96 | rev3HoldTarget(t, fx, 31, 8, target) |
| 97 | if _, err := fx.verify(t); err != nil { |
| 98 | t.Fatalf("sibling matched: %v", err) |
| 99 | } |
| 100 | }) |
| 101 | t.Run("empty-unreadable", func(t *testing.T) { |
| 102 | fx := newWritersKernelFixture(t) |
| 103 | fx.dropAgentHolds(t) |
| 104 | for _, p := range []string{fx.db, fx.db + "-wal"} { |
| 105 | if err := os.Remove(p); err != nil { |
| 106 | t.Fatal(err) |
| 107 | } |
| 108 | } |
| 109 | dir := filepath.Join(fx.proc, "31", "task", "31", "fd") |
| 110 | if err := os.MkdirAll(dir, 0700); err != nil { |
| 111 | t.Fatal(err) |
| 112 | } |
| 113 | if err := os.WriteFile(filepath.Join(dir, "8"), nil, 0600); err != nil { |
| 114 | t.Fatal(err) |
| 115 | } |
| 116 | if _, err := fx.verify(t); err == nil { |
| 117 | t.Fatal("unreadable table yielded writers-stopped") |
| 118 | } |
| 119 | }) |
| 120 | } |
| 121 | |
| 122 | func TestRev4WritersDeletedReplicatorIdentity(t *testing.T) { |
| 123 | fx := newWritersKernelFixture(t) |
| 124 | fx.dropAgentHolds(t) |
| 125 | path := fx.db + "-wal" |
| 126 | held, err := os.Open(path) |
| 127 | if err != nil { |
| 128 | t.Fatal(err) |
| 129 | } |
| 130 | defer held.Close() |
| 131 | dev, ino := fileID(t, path) |
| 132 | if err := os.Remove(path); err != nil { |
| 133 | t.Fatal(err) |
| 134 | } |
| 135 | // Keep one real kernel descriptor table under the authenticated fixture |
| 136 | // process. Readlink reports the deleted name; Stat still reaches the inode. |
| 137 | fdDir := filepath.Join(fx.proc, "20", "task", "20", "fd") |
| 138 | if err := os.Remove(fdDir); err != nil { |
| 139 | t.Fatal(err) |
| 140 | } |
| 141 | if err := os.Symlink("/proc/self/fd", fdDir); err != nil { |
| 142 | t.Fatal(err) |
| 143 | } |
| 144 | hint := stopevidence.DescriptorHint{FD: int(held.Fd()), Device: dev, Inode: ino} |
| 145 | fx.hints = []stopevidence.DescriptorHint{hint} |
| 146 | got, err := fx.verify(t) |
| 147 | if err != nil { |
| 148 | t.Fatal(err) |
| 149 | } |
| 150 | want := stopevidence.Descriptor{PID: 20, TID: 20, FD: hint.FD, Device: dev, Inode: ino} |
| 151 | if len(got.Retained) != 1 || got.Retained[0] != want { |
| 152 | t.Fatalf("deleted replicator identity: %+v", got.Retained) |
| 153 | } |
| 154 | fx.hints[0].Inode++ |
| 155 | if _, err := fx.verify(t); !errors.Is(err, stopevidence.ErrForeignHolder) { |
| 156 | t.Fatalf("substituted hint exempted deleted file: %v", err) |
| 157 | } |
| 158 | } |
| 159 | |
amadan