| 1 | package agent |
| 2 | |
| 3 | import ( |
| 4 | "os" |
| 5 | "path/filepath" |
| 6 | "testing" |
| 7 | ) |
| 8 | |
| 9 | // writeMetaRaw writes raw bytes to the branch-meta sidecar next to sessionPath. |
| 10 | func writeMetaRaw(t *testing.T, sessionPath string, data []byte) { |
| 11 | t.Helper() |
| 12 | if err := os.WriteFile(BranchMetaPath(sessionPath), data, 0o600); err != nil { |
| 13 | t.Fatal(err) |
| 14 | } |
| 15 | } |
| 16 | |
| 17 | func TestLoadBranchMetaZeroFilledIsAbsent(t *testing.T) { |
| 18 | dir := t.TempDir() |
| 19 | path := filepath.Join(dir, "session.jsonl") |
| 20 | // All-NUL torn write (like a Windows non-atomic copy truncated by a |
| 21 | // forced reboot — #6325). |
| 22 | writeMetaRaw(t, path, make([]byte, 1043)) |
| 23 | |
| 24 | meta, ok, err := LoadBranchMeta(path) |
| 25 | if err != nil { |
| 26 | t.Fatalf("zero-filled meta should be treated as absent, got err=%v", err) |
| 27 | } |
| 28 | if ok { |
| 29 | t.Fatal("zero-filled meta should report ok=false") |
| 30 | } |
| 31 | if meta.ID != "" { |
| 32 | t.Fatalf("absent meta should have empty ID, got %q", meta.ID) |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | func TestLoadBranchMetaAllWhitespaceIsAbsent(t *testing.T) { |
| 37 | dir := t.TempDir() |
| 38 | path := filepath.Join(dir, "session.jsonl") |
| 39 | writeMetaRaw(t, path, []byte(" \t\r\n \n")) |
| 40 | |
| 41 | _, ok, err := LoadBranchMeta(path) |
| 42 | if err != nil { |
| 43 | t.Fatalf("whitespace-only meta should be treated as absent, got err=%v", err) |
| 44 | } |
| 45 | if ok { |
| 46 | t.Fatal("whitespace-only meta should report ok=false") |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | func TestLoadBranchMetaGenuineCorruptionStillErrors(t *testing.T) { |
| 51 | dir := t.TempDir() |
| 52 | path := filepath.Join(dir, "session.jsonl") |
| 53 | // Partial JSON (contains real content, not all-zero/whitespace) must still |
| 54 | // surface as an error so we do not silently swallow real corruption. |
| 55 | writeMetaRaw(t, path, []byte(`{"id":"broken`)) // truncated JSON, non-zero |
| 56 | |
| 57 | _, _, err := LoadBranchMeta(path) |
| 58 | if err == nil { |
| 59 | t.Fatal("genuine partial JSON should still return an error") |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | func TestEnsureBranchMetaRebuildsCorruptMeta(t *testing.T) { |
| 64 | dir := t.TempDir() |
| 65 | path := filepath.Join(dir, "session.jsonl") |
| 66 | if err := os.WriteFile(path, []byte("{}"), 0o600); err != nil { |
| 67 | t.Fatal(err) |
| 68 | } |
| 69 | // Corrupt the sidecar with all-zero bytes, then EnsureBranchMeta should |
| 70 | // rebuild it instead of failing. |
| 71 | writeMetaRaw(t, path, make([]byte, 4096)) |
| 72 | |
| 73 | meta, err := EnsureBranchMeta(path) |
| 74 | if err != nil { |
| 75 | t.Fatalf("EnsureBranchMeta should rebuild corrupt meta, got err=%v", err) |
| 76 | } |
| 77 | if meta.ID != BranchID(path) { |
| 78 | t.Fatalf("rebuilt meta ID = %q, want %q", meta.ID, BranchID(path)) |
| 79 | } |
| 80 | // After rebuild, the sidecar must be valid JSON. |
| 81 | loaded, ok, err := LoadBranchMeta(path) |
| 82 | if err != nil || !ok { |
| 83 | t.Fatalf("rebuilt meta should load, ok=%v err=%v", ok, err) |
| 84 | } |
| 85 | if loaded.ID != BranchID(path) { |
| 86 | t.Fatalf("rebuilt loaded ID = %q", loaded.ID) |
| 87 | } |
| 88 | } |
| 89 |