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@@ -6,12 +6,10 @@ import (
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"github.com/docker/distribution/registry/api/v2"
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)
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-// DefaultTag is the default tag for the case where no explicit tag is
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-// specified.
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+// DefaultTag defines the default tag used when performing images related actions and no tag string is specified
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const DefaultTag = "latest"
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-// ErrTagInvalidFormat is an error type used when the tag name has invalid
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-// characters or is longer than allowed.
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+// ErrTagInvalidFormat is returned if tag is invalid.
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type ErrTagInvalidFormat struct {
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name string
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}
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@@ -20,7 +18,9 @@ func (e ErrTagInvalidFormat) Error() string {
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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)
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}
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-// ValidateTagName validates the name of a tag
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+// ValidateTagName validates the name of a tag.
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+// It returns an error if the given name is an emtpy string.
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+// If name does not match v2.TagNameAnchoredRegexp regexp, it returns ErrTagInvalidFormat
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func ValidateTagName(name string) error {
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if name == "" {
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return fmt.Errorf("tag name can't be empty")
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David Calavera