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package docker
import (
"fmt"
"strings"
"github.com/coreos/go-semver/semver"
)
// DefaultTagSuffix returns a set of default suggested tags
// based on the commit ref with an attached suffix.
func DefaultTagSuffix(ref, suffix string) ([]string, error) {
tags, err := DefaultTags(ref)
if err != nil {
return nil, err
}
if len(suffix) == 0 {
return tags, nil
}
for i, tag := range tags {
if tag == "latest" {
tags[i] = suffix
} else {
tags[i] = fmt.Sprintf("%s-%s", tag, suffix)
}
}
return tags, nil
}
func splitOff(input string, delim string) string {
parts := strings.SplitN(input, delim, 2)
if len(parts) == 2 {
return parts[0]
}
return input
}
// DefaultTags returns a set of default suggested tags based on
// the commit ref.
func DefaultTags(ref string) ([]string, error) {
if !strings.HasPrefix(ref, "refs/tags/") {
return []string{"latest"}, nil
}
v := stripTagPrefix(ref)
version, err := semver.NewVersion(v)
if err != nil {
return []string{"latest"}, err
}
if version.PreRelease != "" || version.Metadata != "" {
return []string{
version.String(),
}, nil
}
v = stripTagPrefix(ref)
v = splitOff(splitOff(v, "+"), "-")
dotParts := strings.SplitN(v, ".", 3)
if version.Major == 0 {
return []string{
fmt.Sprintf("%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor),
fmt.Sprintf("%0*d.%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor, len(dotParts[2]), version.Patch),
}, nil
}
return []string{
fmt.Sprintf("%0*d", len(dotParts[0]), version.Major),
fmt.Sprintf("%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor),
fmt.Sprintf("%0*d.%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor, len(dotParts[2]), version.Patch),
}, nil
}
// UseDefaultTag for keep only default branch for latest tag
func UseDefaultTag(ref, defaultBranch string) bool {
if strings.HasPrefix(ref, "refs/tags/") {
return true
}
if stripHeadPrefix(ref) == defaultBranch {
return true
}
return false
}
func stripHeadPrefix(ref string) string {
return strings.TrimPrefix(ref, "refs/heads/")
}
func stripTagPrefix(ref string) string {
ref = strings.TrimPrefix(ref, "refs/tags/")
ref = strings.TrimPrefix(ref, "v")
return ref
}