| package tags |
| |
| import ( |
| "fmt" |
| |
| "github.com/docker/distribution/registry/api/v2" |
| ) |
| |
| // DefaultTag defines the default tag used when performing images related actions and no tag string is specified |
| const DefaultTag = "latest" |
| |
| // ErrTagInvalidFormat is returned if tag is invalid. |
| type ErrTagInvalidFormat struct { |
| name string |
| } |
| |
| func (e ErrTagInvalidFormat) Error() string { |
| return fmt.Sprintf("Illegal tag name (%s): only [A-Za-z0-9_.-] are allowed ('.' and '-' are NOT allowed in the initial), minimum 1, maximum 128 in length", e.name) |
| } |
| |
| // ValidateTagName validates the name of a tag. |
| // It returns an error if the given name is an emtpy string. |
| // If name does not match v2.TagNameAnchoredRegexp regexp, it returns ErrTagInvalidFormat |
| func ValidateTagName(name string) error { |
| if name == "" { |
| return fmt.Errorf("tag name can't be empty") |
| } |
| |
| if !v2.TagNameAnchoredRegexp.MatchString(name) { |
| return ErrTagInvalidFormat{name} |
| } |
| return nil |
| } |