Fix container duplication

Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:alpine as builder
+
+# Application Directory
+RUN mkdir /app
+WORKDIR /app
+
+# First handle dependencies as those probably are more stable than rest of codebase
+COPY ./go.mod /app/
+COPY ./go.sum /app/
+RUN go mod download
+
+# Copy source and build app
+COPY . /app
+RUN go build .
+
+FROM alpine
+
+# Copy over the app from the builder image
+COPY --from=builder /app/lookbuilding /lookbuilding
+
+ENTRYPOINT ["/lookbuilding"]

docker.go

@@ -4,10 +4,8 @@ import (
 	"context"
 	"fmt"
 	"strings"
-	"errors"
 
 	"github.com/docker/docker/api/types"
-	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/network"
 	"github.com/docker/docker/client"
 )
@@ -111,12 +109,6 @@ func (lc LabeledContainer) UpdateTo(cli *client.Client, tag Tag) error {
 		return err
 	}
 
-	if len(lc.Container.Names) != 1 {
-		return errors.New("containers with more (or fewer) than 1 name are not supported")
-	}
-	name := lc.Container.Names[0]
-	tmpOldName := fmt.Sprintf("%s.lb.old", name)
-
 	fmt.Printf("Stopping container %s\n", lc.Container.ID)
 	// TODO: hopefully this is blocking
 	err = cli.ContainerStop(ctx, lc.Container.ID, nil)
@@ -124,6 +116,20 @@ func (lc LabeledContainer) UpdateTo(cli *client.Client, tag Tag) error {
 		return err
 	}
 
+	oldContainer, err := cli.ContainerInspect(ctx, lc.Container.ID)
+	if err != nil {
+		return err
+	}
+
+	name := oldContainer.Name
+	tmpOldName := fmt.Sprintf("%s.lb.old", name)
+
+	config := oldContainer.Config
+	config.Image = image
+
+	hostConfig := oldContainer.HostConfig
+	hostConfig.VolumesFrom = []string{tmpOldName}
+
 	fmt.Printf("Renaming container %s\n", lc.Container.ID)
 	err = cli.ContainerRename(ctx, lc.Container.ID, tmpOldName)
 	if err != nil {
@@ -131,29 +137,22 @@ func (lc LabeledContainer) UpdateTo(cli *client.Client, tag Tag) error {
 	}
 
 	fmt.Printf("Creating new container\n")
-	body, err := cli.ContainerCreate(ctx, &container.Config{
-		Image: image,
-		//Cmd: []string{"echo", "hello world"},
-		Labels: lc.Container.Labels,
-		Tty: false,
-	}, &container.HostConfig{
-		VolumesFrom: []string{tmpOldName},
-	}, &network.NetworkingConfig{
-		EndpointsConfig: lc.Container.NetworkSettings.Networks,
+	new, err := cli.ContainerCreate(ctx, oldContainer.Config, hostConfig, &network.NetworkingConfig{
+		EndpointsConfig: oldContainer.NetworkSettings.Networks,
 	}, name)
 
 	if err != nil {
 		return err
 	}
 
-	fmt.Printf("Starting new container id: %s\n", body.ID)
-	err = cli.ContainerStart(ctx, body.ID, types.ContainerStartOptions{})
+	fmt.Printf("Starting new container id: %s\n", new.ID)
+	err = cli.ContainerStart(ctx, new.ID, types.ContainerStartOptions{})
 	if err != nil {
 		return err
 	}
 
 	fmt.Printf("Removing old container\n")
-	err = cli.ContainerRemove(ctx, tmpOldName, types.ContainerRemoveOptions{
+	err = cli.ContainerRemove(ctx, oldContainer.ID, types.ContainerRemoveOptions{
 		RemoveVolumes: false,
 		RemoveLinks:   false,
 		Force:         false,

main.go

@@ -2,12 +2,12 @@ package main
 
 import (
 	"fmt"
+	"net/http"
 
-	//"github.com/sirupsen/logrus" TODO
 	"github.com/docker/docker/client"
 )
 
-func main() {
+func checkForUpdates() {
 	cli, err := client.NewEnvClient()
 	if err != nil {
 		panic(err)
@@ -56,6 +56,28 @@ func main() {
 			if err != nil {
 				panic(err)
 			}
+		} else {
+			fmt.Println("  no update available")
 		}
 	}
+	fmt.Println("all done")
+}
+
+func main() {
+	addr := "0.0.0.0:8000"
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		go checkForUpdates()
+		fmt.Fprintf(w, "OK")
+	})
+
+	fs := http.FileServer(http.Dir("static/"))
+	http.Handle("/static/", http.StripPrefix("/static/", fs))
+
+	fmt.Printf("Listening on %s\n", addr)
+
+	err := http.ListenAndServe(addr, nil)
+	if err != nil {
+		panic(err)
+	}
 }

registry.go

@@ -16,7 +16,7 @@ type Tag struct {
 }
 
 func anonymousClient() (*registry.Registry, error) {
-	url      := "https://registry-1.docker.io/"
+	url := "https://registry-1.docker.io/"
 	username := "" // anonymous
 	password := "" // anonymous
 
@@ -43,7 +43,7 @@ func getDockerRepoTags(hub *registry.Registry, maybe_owner *string, repository s
 
 		svt := parseTagAsSemVer(tag)
 
-		out = append(out, Tag { tag, svt, digest })
+		out = append(out, Tag{tag, svt, digest})
 	}
 
 	return out, nil

semver.go

@@ -12,7 +12,7 @@ var (
 )
 
 type SemVerTag struct {
-	prefix string
+	prefix  string
 	version semver.Version
 }
 
@@ -31,7 +31,7 @@ func parseTagAsSemVer(tag string) *SemVerTag {
 		return nil
 	}
 
-	svt := SemVerTag {
+	svt := SemVerTag{
 		prefix,
 		*version,
 	}
@@ -42,4 +42,3 @@ func parseTagAsSemVer(tag string) *SemVerTag {
 func (SemVerTag) asTag() string {
 	return ""
 }
-

versioning_mode.go

@@ -42,7 +42,7 @@ func (SemVerMajor) ShouldUpdate(currentTag string, availableTags []Tag) *Tag {
 	semverTags := make([]Tag, 0)
 
 	for _, tag := range availableTags {
-		if tag.SemVer != nil {
+		if tag.SemVer != nil && currentSemVer.version.LessThan(tag.SemVer.version) {
 			semverTags = append(semverTags, tag);
 		}
 	}