| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "crypto/sha256" |
| 5 | "encoding/hex" |
| 6 | "encoding/json" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "io" |
| 10 | "os" |
| 11 | "sort" |
| 12 | "strings" |
| 13 | ) |
| 14 | |
| 15 | // Used only for an input that needs import, and again if its cheap stat stamp |
| 16 | // changes during import. Completed unchanged receipts retain the stat-only path. |
| 17 | func desktopMigrationInputDigest(files []string) (string, error) { |
| 18 | paths := append([]string(nil), files...) |
| 19 | sort.Strings(paths) |
| 20 | h := sha256.New() |
| 21 | for _, path := range paths { |
| 22 | info, err := os.Lstat(path) |
| 23 | if os.IsNotExist(err) { |
| 24 | fmt.Fprintf(h, "%q:missing\n", path) |
| 25 | continue |
| 26 | } |
| 27 | if err != nil { |
| 28 | return "", err |
| 29 | } |
| 30 | if !info.Mode().IsRegular() { |
| 31 | return "", errors.New("migration input is not a regular file") |
| 32 | } |
| 33 | fileHash := sha256.New() |
| 34 | if strings.HasSuffix(path, ".jsonl.meta") { |
| 35 | body, err := os.ReadFile(path) |
| 36 | if err != nil { |
| 37 | return "", err |
| 38 | } |
| 39 | var fields map[string]json.RawMessage |
| 40 | if err := json.Unmarshal(body, &fields); err != nil { |
| 41 | return "", err |
| 42 | } |
| 43 | // These fields are read-model projections. Keep ancestry, workspace, |
| 44 | // selected-head semantics, configuration and every unknown field. |
| 45 | for _, key := range []string{"revision", "content_digest", "writer_id", "schema_version", "turns", "preview", "listing_revision", "listing_content_digest"} { |
| 46 | delete(fields, key) |
| 47 | } |
| 48 | body, err = json.Marshal(fields) |
| 49 | if err != nil { |
| 50 | return "", err |
| 51 | } |
| 52 | _, _ = fileHash.Write(body) |
| 53 | } else { |
| 54 | file, err := os.Open(path) |
| 55 | if err != nil { |
| 56 | return "", err |
| 57 | } |
| 58 | _, readErr := io.Copy(fileHash, file) |
| 59 | if err := errors.Join(readErr, file.Close()); err != nil { |
| 60 | return "", err |
| 61 | } |
| 62 | } |
| 63 | fmt.Fprintf(h, "%q:%x\n", path, fileHash.Sum(nil)) |
| 64 | } |
| 65 | return hex.EncodeToString(h.Sum(nil)), nil |
| 66 | } |
| 67 |