Parse tags as semver

go.mod

@@ -4,6 +4,7 @@ go 1.15
 
 require (
 	github.com/Microsoft/go-winio v0.4.14 // indirect
+	github.com/coreos/go-semver v0.3.0
 	github.com/docker/distribution v2.7.1+incompatible // indirect
 	github.com/docker/docker v1.13.1
 	github.com/docker/go-connections v0.4.0 // indirect

go.sum

@@ -1,5 +1,7 @@
 github.com/Microsoft/go-winio v0.4.14 h1:+hMXMk01us9KgxGb7ftKQt2Xpf5hH/yky+TDA+qxleU=
 github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
+github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
+github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/docker/distribution v2.7.1+incompatible h1:a5mlkVzth6W5A4fOsS3D2EO5BUmsJpcB+cRlLU7cSug=

main.go

@@ -11,22 +11,12 @@ import (
 	"github.com/docker/docker/client"
 )
 
-const (
-	versioningModeLabel = "lookbuilding.mode"
-)
-
-type VersioningMode string
-
-const (
-	SemVerAny VersioningMode = "SemVerAny"
-)
-
 type labeledContainer struct {
 	container types.Container
 	mode      VersioningMode
 }
 
-type tag struct {
+type Tag struct {
 	Creator             int     `json:"creator"`
 	ID                  int     `json:"id"`
 	LastUpdated         string  `json:"last_updated"`
@@ -39,10 +29,10 @@ type tag struct {
 	TagStatus           string  `json:"tag_status"`
 	TagLastPulled       string  `json:"tag_last_pulled"`
 	TagLastPushed       string  `json:"tag_last_pushed"`
-	Images              []image `json:images`
+	Images              []Image `json:images`
 }
 
-type image struct {
+type Image struct {
 	Architecture string `json:architecture`
 	Features     string `json:features`
 	Digest       string `json:digest`
@@ -82,10 +72,10 @@ func getImageParts(name string) (*string, string, *string) {
 	return owner, repository, tag
 }
 
-func getDockerRepoTags(maybe_owner *string, repository string) []tag {
+func getDockerRepoTags(maybe_owner *string, repository string) []Tag {
 	type dockerPollResponse struct {
 		Count   int   `json:"count"`
-		Results []tag `json:"results"`
+		Results []Tag `json:"results"`
 	}
 
 	owner := "_"
@@ -116,19 +106,26 @@ func getLabeledContainers(cli *client.Client) []labeledContainer {
 		panic(err)
 	}
 
+	fmt.Println("scanning running container labels")
 	for _, container := range containers {
-		fmt.Printf("%s %s\n", container.ID[:10], container.Image)
+		fmt.Printf("- %s %s\n", container.ID[:10], container.Image)
 		for k, v := range container.Labels {
+			fmt.Printf("  - \"%s\": \"%s\"\n", k, v)
 			if k == versioningModeLabel {
+				mode := ParseVersioningMode(v)
+				if mode == nil {
+					fmt.Printf("Failed to parse '%s' as a versioning mode\n", v)
+					continue
+				}
+
 				lc := labeledContainer{
 					container,
-					SemVerAny,
+					*mode,
 				}
 
 				out = append(out, lc)
-				continue;
+				continue
 			}
-			fmt.Printf("  - %s: %s\n", k, v)
 		}
 	}
 
@@ -142,6 +139,8 @@ func main() {
 	}
 
 	labeledContainers := getLabeledContainers(cli)
+	fmt.Println()
+
 	for _, lc := range labeledContainers {
 		owner, repository, tag := getImageParts(lc.container.Image)
 
@@ -150,21 +149,26 @@ func main() {
 		} else {
 			fmt.Printf("container image: _/%s\n", repository)
 		}
+		fmt.Printf("  versioning: %+v\n", lc.mode.Label())
 
 		fmt.Printf("  id: %s\n", lc.container.ImageID)
 
 		if tag != nil {
-			fmt.Printf("  tag: %s\n", *tag)
+			fmt.Printf("  current tag: %s\n", *tag)
 		} else {
-			fmt.Printf("  no tag\n")
+			fmt.Printf("  no current tag, skipping\n")
+			continue
 		}
 
 		repoTags := getDockerRepoTags(owner, repository)
 
-		fmt.Println("## tags in registry ##")
+		fmt.Println("  tags in registry:")
 		for _, tag := range repoTags {
-			fmt.Printf("  tag: %s\n", tag.Name)
+			fmt.Printf("  - \"%s\"\n", tag.Name)
-		}
+			svt := parseTagAsSemVer(tag.Name)
-		fmt.Println("##")
+			if svt != nil {
+				fmt.Printf("    semver: true\n")
+			}
+		}
 	}
 }

semver.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	//"fmt"
+	"regexp"
+
+	"github.com/coreos/go-semver/semver"
+)
+
+var (
+	rxSemVerPrefix = regexp.MustCompile(`^[^\d]*`)
+)
+
+type SemVerTag struct {
+	prefix string
+	version semver.Version
+}
+
+// Return a 
+// Returns nil if the tag did not parse as semver
+func parseTagAsSemVer(tag string) *SemVerTag {
+	var prefix string
+	loc := rxSemVerPrefix.FindStringIndex(tag)
+	if loc != nil {
+		prefix = tag[:loc[1]]
+		tag = tag[loc[1]:]
+	}
+
+	version, err := semver.NewVersion(tag)
+	if err != nil {
+		return nil
+	}
+
+	svt := SemVerTag {
+		prefix,
+		*version,
+	}
+
+	return &svt
+}
+
+func (SemVerTag) asTag() string {
+	return ""
+}
+

versioning_mode.go

@@ -0,0 +1,55 @@
+package main
+
+const (
+	versioningModeLabel = "lookbuilding.mode"
+)
+
+type VersioningMode interface {
+	Label() string
+	ShouldUpdate(currentTag string, availableTags []Tag) *Tag
+}
+
+type SameTag struct {}
+type SemVerMajor struct {}
+type SemVerMinor struct {}
+type SemVerPatch struct {}
+
+var (
+	AllModes = [...]VersioningMode{
+		SameTag{},
+		SemVerMajor{},
+		SemVerMinor{},
+		SemVerPatch{},
+	}
+)
+
+func (SameTag) Label() string { return "same_tag" }
+func (SameTag) ShouldUpdate(currentTag string, availableTags []Tag) *Tag {
+	return nil // TODO: implement me
+}
+
+func (SemVerMajor) Label() string { return "semver_major" }
+func (SemVerMajor) ShouldUpdate(currentTag string, availableTags []Tag) *Tag {
+	return nil // TODO: implement me
+}
+
+func (SemVerMinor) Label() string { return "semver_minor" }
+func (SemVerMinor) ShouldUpdate(currentTag string, availableTags []Tag) *Tag {
+	return nil // TODO: implement me
+}
+
+func (SemVerPatch) Label() string { return "semver_patch" }
+func (SemVerPatch) ShouldUpdate(currentTag string, availableTags []Tag) *Tag {
+	return nil // TODO: implement me
+}
+
+
+func ParseVersioningMode(input string) *VersioningMode {
+	for _, mode := range AllModes {
+		if mode.Label() == input {
+			return &mode
+		}
+	}
+	return nil
+}
+