diff --git a/README.md b/README.md index 8576e93..be13394 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,7 @@ # docker-check-version-updates -Checks current running containers for newer tags according to semver \ No newline at end of file +Checks current running containers for newer tags according to semver + +Usage: + + go run . diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..32cf670 --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,7 @@ +version: "3.4" + +services: + main: + build: . + volumes: + - "/var/run/docker.sock:/var/run/docker.sock" diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..70cd15a --- /dev/null +++ b/go.mod @@ -0,0 +1,17 @@ +module github.com/iamthefij/tag-notifier + +go 1.15 + +require ( + github.com/containerd/containerd v1.4.3 // indirect + github.com/docker/distribution v2.7.1+incompatible // indirect + github.com/docker/docker v17.12.0-ce-rc1.0.20200916142827-bd33bbf0497b+incompatible + github.com/docker/go-connections v0.4.0 // indirect + github.com/docker/go-units v0.4.0 // indirect + github.com/gogo/protobuf v1.3.1 // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.0.1 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/sirupsen/logrus v1.7.0 // indirect + google.golang.org/grpc v1.33.2 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..05a8a23 --- /dev/null +++ b/go.sum @@ -0,0 +1,121 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Microsoft/go-winio v0.4.15 h1:qkLXKzb1QoVatRyd/YlXZ/Kg0m5K3SPuoD82jjSOaBc= +github.com/Microsoft/go-winio v0.4.15/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= 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+++ b/main.go @@ -0,0 +1,223 @@ +package main + +import ( + "context" + "encoding/json" + "fmt" + "net/http" + "os" + "regexp" + "sort" + "strconv" + "strings" + + dockerTypes "github.com/docker/docker/api/types" + dockerClient "github.com/docker/docker/client" +) + +var registryBase = "https://registry.hub.docker.com" +var maxPages = 10 + +var tagRegexp = regexp.MustCompile(`(.*):[vV]{0,1}([0-9.]+)(-(.*)){0,1}`) + +// ImageTag is wraps an image and tag values for a container +type ImageTag struct { + ImageTag string + Image string + TagDesc string + Version string + VersionParts []int +} + +// IsComparable will return true if to images share the same base, description, and version resolution +func (thisTag ImageTag) IsComparable(otherTag ImageTag) bool { + return thisTag.Image == otherTag.Image && thisTag.TagDesc == otherTag.TagDesc && len(thisTag.VersionParts) == len(otherTag.VersionParts) + +} + +// IsNewerThan will return true if two tags are comparable and this tag is newer than the one passed in +func (thisTag ImageTag) IsNewerThan(otherTag ImageTag) bool { + return thisTag.CompareTo(otherTag) == 1 +} + +// CompareTo compares two ImageTags. It will return 0 if they are not-comparable or equal 1 if newer and -1 if less +func (thisTag ImageTag) CompareTo(otherTag ImageTag) int { + if !thisTag.IsComparable(otherTag) { + return 0 + } + + for i := range thisTag.VersionParts { + if thisTag.VersionParts[i] > otherTag.VersionParts[i] { + return 1 + } else if thisTag.VersionParts[i] < otherTag.VersionParts[i] { + return -1 + } + } + + // Everything must be equal + return 0 +} + +// ParseImageTag parses an image and tag name to a struct +func ParseImageTag(imageTag string) (ImageTag, error) { + results := tagRegexp.FindStringSubmatch(imageTag) + if results == nil || results[0] == "" { + return ImageTag{}, fmt.Errorf("could not recognize versions in %s", imageTag) + } + + // Extract image name with repo + image := results[1] + if !strings.Contains(image, "/") { + image = "library/" + image + } + + // Extract version number + version := results[2] + versionParts := []int{} + var verPart int + var err error + for _, v := range strings.Split(version, ".") { + verPart, err = strconv.Atoi(v) + if err != nil { + return ImageTag{}, err + } + versionParts = append(versionParts, verPart) + } + + return ImageTag{ + ImageTag: imageTag, + Image: image, + Version: version, + VersionParts: versionParts, + TagDesc: results[4], + }, nil +} + +// ImageTagSort is an interface for sorting ImageTags +type ImageTagSort []ImageTag + +// Len gives the length of the image sorter interface +func (slice ImageTagSort) Len() int { + return len(slice) +} + +// Less returns true if the first value is less than or equal to the second +func (slice ImageTagSort) Less(i, j int) bool { + return slice[i].CompareTo(slice[j]) == -1 +} + +// Swap two values in slice +func (slice ImageTagSort) Swap(i, j int) { + slice[i], slice[j] = slice[j], slice[i] +} + +func getJSON(url string, response interface{}) error { + resp, err := http.Get(url) + if err != nil { + return err + } + // defer func() { _ = resp.Body.Close() }() + defer resp.Body.Close() + decoder := json.NewDecoder(resp.Body) + err = decoder.Decode(response) + if err != nil { + return err + } + + return nil +} + +func listTags(current ImageTag) ([]ImageTag, error) { + var err error + results := []ImageTag{} + + type tagsResponse struct { + Count int + Next string + Previous string + Results []struct { + ID int + LastUpdated string `json:"last_updated"` + Name string + } + } + + url := fmt.Sprintf("%s/v2/repositories/%s/tags", registryBase, current.Image) + pageCount := 0 + var response tagsResponse + var newTag ImageTag + for url != "" && pageCount <= maxPages { + err = getJSON(url, &response) + if err != nil { + return results, err + } + + for _, tag := range response.Results { + newTag, err = ParseImageTag(fmt.Sprintf("%s:%s", current.Image, tag.Name)) + if err == nil { + results = append(results, newTag) + } + } + url = response.Next + pageCount++ + } + + return results, nil +} + +func getNewerTags(current ImageTag) ([]ImageTag, error) { + newerTags := []ImageTag{} + tags, err := listTags(current) + if err != nil { + return newerTags, err + } + for _, tag := range tags { + if tag.IsNewerThan(current) { + newerTags = append(newerTags, tag) + } + } + // Sort tags with newest first + sort.Sort(sort.Reverse(ImageTagSort(newerTags))) + return newerTags, nil +} + +func main() { + dockerClient, err := dockerClient.NewClientWithOpts(dockerClient.FromEnv) + if err != nil { + panic(err) + } + + containers, err := dockerClient.ContainerList(context.Background(), dockerTypes.ContainerListOptions{}) + if err != nil { + panic(err) + } + + hasUpdate := false + images := map[string]bool{} + for _, container := range containers { + images[container.Image] = true + } + for image := range images { + fmt.Printf("[%s] Checking for updates...\n", image) + it, err := ParseImageTag(image) + if err != nil { + fmt.Printf("[%s] Can't parse tag: %v\n", image, err) + continue + } + newerTags, err := getNewerTags(it) + if err != nil { + fmt.Printf("[%s] Panic getting new tags: %v\n", image, err) + panic(err) + } + if len(newerTags) == 0 { + fmt.Printf("[%s] No newer versions found\n", image) + continue + } + hasUpdate = true + fmt.Printf("[%s] Newer version found. Recommend update to %s\n", image, newerTags[0].ImageTag) + } + + if hasUpdate { + os.Exit(10) + } +}