FileHash returns string of hash of filePath passed in And optional string can be added to content that will be hashed
(filePath string, optionalExtraString string)
| 13 | // FileHash returns string of hash of filePath passed in |
| 14 | // And optional string can be added to content that will be hashed |
| 15 | func FileHash(filePath string, optionalExtraString string) (string, error) { |
| 16 | file, err := os.Open(filePath) |
| 17 | if err != nil { |
| 18 | return "", err |
| 19 | } |
| 20 | defer func() { |
| 21 | err = file.Close() |
| 22 | if err != nil { |
| 23 | util.Warning("unable to close file: %v", err) |
| 24 | } |
| 25 | }() |
| 26 | |
| 27 | hash := sha1.New() |
| 28 | if _, err := io.Copy(hash, file); err != nil { |
| 29 | return "", err |
| 30 | } |
| 31 | // Include file location in the hash, if in a different |
| 32 | // place it should not hash the same |
| 33 | // file.Name() is the full path of the file |
| 34 | |
| 35 | canonicalFileName := file.Name() |
| 36 | |
| 37 | // Use a canonical filename in unix-style format so that we don't |
| 38 | // get caught by differences in filename format on Windows. |
| 39 | if nodeps.IsWindows() { |
| 40 | canonicalFileName = util.WindowsPathToCygwinPath(canonicalFileName) |
| 41 | } |
| 42 | if _, err := hash.Write([]byte(canonicalFileName)); err != nil { |
| 43 | return "", err |
| 44 | } |
| 45 | |
| 46 | // Add optional string to hash if provided |
| 47 | if len(optionalExtraString) > 0 { |
| 48 | if _, err := hash.Write([]byte(optionalExtraString)); err != nil { |
| 49 | return "", err |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | sum := hash.Sum(nil) |
| 54 | |
| 55 | return fmt.Sprintf("%x", sum), nil |
| 56 | } |