commit f58541dc098bcfef14fa0188bf0354018383ae3f Author: Simon Rieger Date: Thu Jul 17 02:35:36 2025 +0200 first commit diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..2d56db4 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,13 @@ +FROM golang:1.24-alpine AS builder +RUN apk add --no-cache git +WORKDIR /app +COPY go.mod ./ +RUN go mod download +COPY . . +RUN CGO_ENABLED=0 GOOS=linux go build -o image-checker . + +FROM alpine:latest +RUN apk --no-cache add ca-certificates +WORKDIR /app +COPY --from=builder /app/image-checker . +CMD ["./image-checker"] diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..f46ccb3 --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,8 @@ +version: "3" +services: + image-checker: + build: . + #environment: + # - IMAGE_NAME=registry.gitlab.com/mygroup/myrepo/myimage:latest + volumes: + - /var/run/docker.sock:/var/run/docker.sock diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..95a29af --- /dev/null +++ b/go.mod @@ -0,0 +1,35 @@ +module image-checker + +go 1.24.1 + +require github.com/docker/docker v28.3.2+incompatible + +require ( + github.com/Microsoft/go-winio v0.4.14 // indirect + github.com/containerd/errdefs v1.0.0 // indirect + github.com/containerd/errdefs/pkg v0.3.0 // indirect + github.com/containerd/log v0.1.0 // indirect + github.com/distribution/reference v0.6.0 // indirect + github.com/docker/go-connections v0.5.0 // indirect + github.com/docker/go-units v0.5.0 // indirect + github.com/felixge/httpsnoop v1.0.4 // indirect + github.com/go-logr/logr v1.4.3 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/moby/docker-image-spec v1.3.1 // indirect + github.com/moby/sys/atomicwriter v0.1.0 // indirect + github.com/moby/term v0.5.2 // indirect + github.com/morikuni/aec v1.0.0 // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.1.1 // indirect + github.com/pkg/errors v0.9.1 // indirect + go.opentelemetry.io/auto/sdk v1.1.0 // indirect + go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.62.0 // indirect + go.opentelemetry.io/otel v1.37.0 // indirect + go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.37.0 // indirect + go.opentelemetry.io/otel/metric v1.37.0 // indirect + go.opentelemetry.io/otel/trace v1.37.0 // indirect + golang.org/x/sys v0.33.0 // indirect + golang.org/x/time v0.12.0 // indirect + gotest.tools/v3 v3.5.2 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..7032ea7 --- /dev/null +++ b/go.sum @@ -0,0 +1,135 @@ +github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c h1:udKWzYgxTojEKWjV8V+WSxDXJ4NFATAsZjh8iIbsQIg= +github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E= +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/cenkalti/backoff/v5 v5.0.2 h1:rIfFVxEf1QsI7E1ZHfp/B4DF/6QBAUhmgkxc0H7Zss8= +github.com/cenkalti/backoff/v5 v5.0.2/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw= +github.com/containerd/errdefs v1.0.0 h1:tg5yIfIlQIrxYtu9ajqY42W3lpS19XqdxRQeEwYG8PI= +github.com/containerd/errdefs v1.0.0/go.mod h1:+YBYIdtsnF4Iw6nWZhJcqGSg/dwvV7tyJ/kCkyJ2k+M= +github.com/containerd/errdefs/pkg v0.3.0 h1:9IKJ06FvyNlexW690DXuQNx2KA2cUJXx151Xdx3ZPPE= +github.com/containerd/errdefs/pkg v0.3.0/go.mod h1:NJw6s9HwNuRhnjJhM7pylWwMyAkmCQvQ4GpJHEqRLVk= +github.com/containerd/log v0.1.0 h1:TCJt7ioM2cr/tfR8GPbGf9/VRAX8D2B4PjzCpfX540I= +github.com/containerd/log v0.1.0/go.mod h1:VRRf09a7mHDIRezVKTRCrOq78v577GXq3bSa3EhrzVo= +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/distribution/reference v0.6.0 h1:0IXCQ5g4/QMHHkarYzh5l+u8T3t73zM5QvfrDyIgxBk= +github.com/distribution/reference v0.6.0/go.mod h1:BbU0aIcezP1/5jX/8MP0YiH4SdvB5Y4f/wlDRiLyi3E= +github.com/docker/docker v28.3.2+incompatible h1:wn66NJ6pWB1vBZIilP8G3qQPqHy5XymfYn5vsqeA5oA= +github.com/docker/docker v28.3.2+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk= +github.com/docker/go-connections v0.5.0 h1:USnMq7hx7gwdVZq1L49hLXaFtUdTADjXGp+uj1Br63c= +github.com/docker/go-connections v0.5.0/go.mod h1:ov60Kzw0kKElRwhNs9UlUHAE/F9Fe6GLaXnqyDdmEXc= +github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4= +github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk= +github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg= +github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U= +github.com/go-logr/logr v1.2.2/go.mod 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h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A= +google.golang.org/grpc v1.73.0 h1:VIWSmpI2MegBtTuFt5/JWy2oXxtjJ/e89Z70ImfD2ok= +google.golang.org/grpc v1.73.0/go.mod h1:50sbHOUqWoCQGI8V2HQLJM0B+LMlIUjNSZmow7EVBQc= +google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY= +google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gotest.tools/v3 v3.5.2 h1:7koQfIKdy+I8UTetycgUqXWSDwpgv193Ka+qRsmBY8Q= +gotest.tools/v3 v3.5.2/go.mod h1:LtdLGcnqToBH83WByAAi/wiwSFCArdFIUV/xxN4pcjA= diff --git a/main.go b/main.go new file mode 100644 index 0000000..2a862d4 --- /dev/null +++ b/main.go @@ -0,0 +1,129 @@ +package main + +import ( + "context" + "encoding/json" + "fmt" + "io" + "net/http" + "regexp" + + "github.com/docker/docker/api/types/container" + "github.com/docker/docker/api/types/image" + "github.com/docker/docker/client" +) + +// Zerlegt einen Image-Namen in Registry, Repository und Tag +func parseImageName(imageName string) (registry, repo, tag string) { + defaultRegistry := "registry-1.docker.io" + tag = "latest" + r := regexp.MustCompile(`^(?:(?P[^/]+)/)?(?P[^:]+)(?::(?P.+))?$`) + match := r.FindStringSubmatch(imageName) + if len(match) == 0 { + return defaultRegistry, imageName, tag + } + index := r.SubexpIndex("registry") + if match[index] != "" { + registry = match[index] + } else { + registry = defaultRegistry + } + index = r.SubexpIndex("repo") + repo = match[index] + index = r.SubexpIndex("tag") + if match[index] != "" { + tag = match[index] + } + return +} + +// Holt Digest aus Registry (funktioniert für öffentliche OCI-kompatible Registries) +func getRemoteDigest(registry, repo, tag string) (string, error) { + manifestURL := fmt.Sprintf("https://%s/v2/%s/manifests/%s", registry, repo, tag) + req, err := http.NewRequest("GET", manifestURL, nil) + if err != nil { + return "", err + } + req.Header.Set("Accept", "application/vnd.docker.distribution.manifest.v2+json") + resp, err := http.DefaultClient.Do(req) + if err != nil { + return "", err + } + defer resp.Body.Close() + if resp.StatusCode != http.StatusOK { + body, _ := io.ReadAll(resp.Body) + return "", fmt.Errorf("%s [%d]: %s", manifestURL, resp.StatusCode, body) + } + digest := resp.Header.Get("Docker-Content-Digest") + if digest == "" { + var manifest map[string]interface{} + if err := json.NewDecoder(resp.Body).Decode(&manifest); err == nil { + if config, ok := manifest["config"].(map[string]interface{}); ok { + if dgst, ok := config["digest"].(string); ok { + return dgst, nil + } + } + } + return "", fmt.Errorf("Kein Digest in Registry-Manifest gefunden") + } + return digest, nil +} + +// Gibt den Digest zu einem Image-Namen zurück (verwendet image.ListOptions) +func getLocalDigestOfImage(ctx context.Context, apiClient *client.Client, imageName string) (string, error) { + images, err := apiClient.ImageList(ctx, image.ListOptions{All: true}) + if err != nil { + return "", err + } + for _, img := range images { + for _, t := range img.RepoTags { + if t == imageName { + if len(img.RepoDigests) > 0 { + return img.RepoDigests[0], nil + } + return img.ID, nil + } + } + } + return "", fmt.Errorf("Image %s nicht lokal gefunden", imageName) +} + +func main() { + apiClient, err := client.NewClientWithOpts(client.FromEnv) + if err != nil { + panic(err) + } + defer apiClient.Close() + + ctx := context.Background() + containers, err := apiClient.ContainerList(ctx, container.ListOptions{All: true}) + if err != nil { + panic(err) + } + + for _, ctr := range containers { + fmt.Printf("%s %s (status: %s)\n", ctr.ID, ctr.Image, ctr.Status) + registry, repo, tag := parseImageName(ctr.Image) + fmt.Printf(" Registry: %s\n Repo: %s\n Tag: %s\n", registry, repo, tag) + + localDigest, err := getLocalDigestOfImage(ctx, apiClient, ctr.Image) + if err != nil { + fmt.Printf(" Fehler beim lokalen Digest: %v\n", err) + continue + } + + remoteDigest, err := getRemoteDigest(registry, repo, tag) + if err != nil { + fmt.Printf(" Fehler beim Registry-Digest: %v\n", err) + continue + } + + fmt.Println(" Local Digest: ", localDigest) + fmt.Println(" Remote Digest:", remoteDigest) + if localDigest == remoteDigest { + fmt.Println(" -> Image ist aktuell") + } else { + fmt.Println(" -> Update verfügbar!") + } + } +}