| package dockerignore |
| |
| import ( |
| "bufio" |
| "bytes" |
| "fmt" |
| "io" |
| "path/filepath" |
| "strings" |
| ) |
| |
| // ReadAll reads a .dockerignore file and returns the list of file patterns |
| // to ignore. Note this will trim whitespace from each line as well |
| // as use GO's "clean" func to get the shortest/cleanest path for each. |
| func ReadAll(reader io.Reader) ([]string, error) { |
| if reader == nil { |
| return nil, nil |
| } |
| |
| scanner := bufio.NewScanner(reader) |
| var excludes []string |
| currentLine := 0 |
| |
| utf8bom := []byte{0xEF, 0xBB, 0xBF} |
| for scanner.Scan() { |
| scannedBytes := scanner.Bytes() |
| // We trim UTF8 BOM |
| if currentLine == 0 { |
| scannedBytes = bytes.TrimPrefix(scannedBytes, utf8bom) |
| } |
| pattern := string(scannedBytes) |
| currentLine++ |
| // Lines starting with # (comments) are ignored before processing |
| if strings.HasPrefix(pattern, "#") { |
| continue |
| } |
| pattern = strings.TrimSpace(pattern) |
| if pattern == "" { |
| continue |
| } |
| pattern = filepath.Clean(pattern) |
| pattern = filepath.ToSlash(pattern) |
| excludes = append(excludes, pattern) |
| } |
| if err := scanner.Err(); err != nil { |
| return nil, fmt.Errorf("Error reading .dockerignore: %v", err) |
| } |
| return excludes, nil |
| } |
