Change: Rewrite Dockerhost scripts in Go

docker-host/Dockerfile

@@ -1,5 +1,15 @@
-FROM uselagoon/commons:latest as commons
+FROM golang:1.18-alpine3.17 as builder
+
+WORKDIR /build
+
+COPY main.go .
+COPY go.mod .
+COPY go.sum .
+
+# compile
+RUN CGO_ENABLED=0  GOOS=linux GOARCH=amd64 go build docker-host .
 
+FROM uselagoon/commons:latest as commons
 FROM docker:20.10.24-dind
 
 LABEL org.opencontainers.image.authors="The Lagoon Authors" maintainer="The Lagoon Authors"
@@ -11,6 +21,8 @@ COPY --from=commons /bin/fix-permissions /bin/ep /bin/docker-sleep /bin/
 COPY --from=commons /sbin/tini /sbin/
 COPY --from=commons /home /home
 
+COPY --from=builder /build/docker-host /docker-host
+
 ENV TMPDIR=/tmp \
     TMP=/tmp \
     HOME=/home \
@@ -29,11 +41,6 @@ ENV DOCKER_HOST=docker-host \
 
 RUN fix-permissions /home
 
-COPY update-push-images.sh /update-push-images.sh
-COPY update-images.sh /update-images.sh
-COPY prune-images.sh /prune-images.sh
-COPY remove-exited.sh /remove-exited.sh
-
 ENTRYPOINT ["/sbin/tini", "--", "/lagoon/entrypoints.sh"]
 
-CMD ["sh", "-c", "sh /usr/local/bin/dind /usr/local/bin/dockerd --host=tcp://0.0.0.0:2375 --host=unix:///var/run/docker.sock --insecure-registry=${REGISTRY} --insecure-registry=harbor-harbor-core.harbor.svc.cluster.local:80 --bip=${BIP} --storage-driver=overlay2 --storage-opt=overlay2.override_kernel_check=1 --registry-mirror=${REGISTRY_MIRROR}"]
+CMD ["sh", "-c", "/docker-host"]

docker-host/go.mod

@@ -0,0 +1,29 @@
+module docker-host
+
+go 1.19
+
+require (
+	github.com/docker/docker v23.0.3+incompatible
+	github.com/robfig/cron/v3 v3.0.1
+)
+
+require (
+	github.com/Microsoft/go-winio v0.6.0 // indirect
+	github.com/docker/distribution v2.8.1+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/moby/term v0.0.0-20221205130635-1aeaba878587 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.0.2 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/stretchr/testify v1.8.2 // indirect
+	github.com/uselagoon/machinery v0.0.7 // indirect
+	golang.org/x/mod v0.10.0 // indirect
+	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/sys v0.7.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	golang.org/x/tools v0.8.0 // indirect
+	gotest.tools/v3 v3.4.0 // indirect
+)

docker-host/go.sum

@@ -0,0 +1,101 @@
+github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8=
+github.com/Microsoft/go-winio v0.6.0 h1:slsWYD/zyx7lCXoZVlvQrj0hPTM1HI4+v1sIda2yDvg=
+github.com/Microsoft/go-winio v0.6.0/go.mod h1:cTAf44im0RAYeL23bpB+fzCyDH2MJiz2BO69KH/soAE=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+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 v2.8.1+incompatible h1:Q50tZOPR6T/hjNsyc9g8/syEs6bk8XXApsHjKukMl68=
+github.com/docker/distribution v2.8.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
+github.com/docker/docker v23.0.2+incompatible h1:q81C2qQ/EhPm8COZMUGOQYh4qLv4Xu6CXELJ3WK/mlU=
+github.com/docker/docker v23.0.2+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/docker v23.0.3+incompatible h1:9GhVsShNWz1hO//9BNg/dpMnZW25KydO4wtVxWAIbho=
+github.com/docker/docker v23.0.3+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKohAFqRJQ=
+github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
+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=
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docker-host/main.go

@@ -0,0 +1,140 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/client"
+	"github.com/robfig/cron/v3"
+	machineryvars "github.com/uselagoon/machinery/utils/variables"
+)
+
+const EnvOverrideHost = "DOCKER_HOST"
+
+var dockerHost = machineryvars.GetEnv("DOCKER_HOST", "docker-host")
+var repo = machineryvars.GetEnv("REPOSITORY_TO_UPDATE", "amazeeio")
+var REGISTRY = machineryvars.GetEnv("REGISTRY", "docker-registry.default.svc:5000")
+var BIP = machineryvars.GetEnv("BIP", "172.16.0.1/16")
+var REGISTRY_MIRROR = machineryvars.GetEnv("REGISTRY_MIRROR", "https://imagecache.amazeeio.cloud")
+var pruneImagesSchedule = machineryvars.GetEnv("PRUNE_SCHEDULE", "22 1 * * *")
+var removeExitedSchedule = machineryvars.GetEnv("REMOVE_EXITED_SCHEDULE", "22 */4 * * *")
+var updateImagesSchedule = machineryvars.GetEnv("UPDATE_IMAGES_SCHEDULE", "*/15 * * * *")
+var pruneImagesUntil = machineryvars.GetEnv("PRUNE_IMAGES_UNTIL", "168h")
+var danglingFilter = machineryvars.GetEnv("DANGLING_FILTER", "true")
+
+func main() {
+	cli, err := client.NewClientWithOpts(
+		client.WithHostFromEnv(),
+		client.WithAPIVersionNegotiation(),
+	)
+	if err != nil {
+		fmt.Println("Error", err)
+	}
+	defer cli.Close()
+
+	var command = fmt.Sprintf("/usr/local/bin/dind /usr/local/bin/dockerd --host=tcp://0.0.0.0:2375 --host=unix:///var/run/docker.sock --insecure-registry=%s --insecure-registry=harbor-harbor-core.harbor.svc.cluster.local:80 --bip=%s --storage-driver=overlay2 --storage-opt=overlay2.override_kernel_check=1 --registry-mirror=%s", REGISTRY, BIP, REGISTRY_MIRROR)
+	var cmd = exec.Command("sh", "-c", command)
+
+	if dockerHost != cli.DaemonHost() {
+		fmt.Sprintf("Could not connect to %s", dockerHost)
+	}
+	c := cron.New()
+	pruneImages(cli, c)
+	removeExited(cli, c)
+	updateImages(cli, c)
+	c.Start()
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		fmt.Println("could not run command: ", err)
+	}
+}
+
+func pruneImages(client *client.Client, c *cron.Cron) {
+	c.AddFunc(pruneImagesSchedule, func() {
+		log.Println("Starting image prune")
+		ageFilter := filters.NewArgs()
+		pruneDanglingFilter := filters.NewArgs()
+		ageFilter.Add("until", pruneImagesUntil)
+		pruneDanglingFilter.Add("dangling", danglingFilter)
+
+		// # prune all images older than 7 days or what is specified in the environment variable
+		_, err := client.ImagesPrune(context.Background(), ageFilter)
+		if err != nil {
+			log.Println(err)
+		}
+		// # prune all docker build cache images older than 7 days or what is specified in the environment variable
+		_, buildErr := client.BuildCachePrune(context.Background(), types.BuildCachePruneOptions{Filters: ageFilter})
+		if buildErr != nil {
+			log.Println(buildErr)
+		}
+		// # after old images are pruned, clean up dangling images
+		_, pruneErr := client.ImagesPrune(context.Background(), pruneDanglingFilter)
+		if pruneErr != nil {
+			log.Println(pruneErr)
+		}
+		log.Println("Prune complete")
+	})
+}
+
+func removeExited(client *client.Client, c *cron.Cron) {
+	c.AddFunc(removeExitedSchedule, func() {
+		log.Println("Starting removeExited")
+		ctx := context.Background()
+		statusFilter := filters.NewArgs()
+		statusFilter.Add("status", "exited")
+		containers, err := client.ContainerList(ctx, types.ContainerListOptions{
+			Filters: statusFilter,
+		})
+		if err != nil {
+			log.Println(err)
+		}
+
+		// # remove all exited containers
+		for _, container := range containers {
+			err := client.ContainerRemove(ctx, container.ID, types.ContainerRemoveOptions{
+				Force:         true,
+				RemoveVolumes: true,
+			})
+			if err != nil {
+				log.Println(err)
+			}
+		}
+		log.Println("removeExited complete")
+	})
+}
+
+func updateImages(client *client.Client, c *cron.Cron) {
+	c.AddFunc(updateImagesSchedule, func() {
+		log.Println("Starting update images")
+		ctx := context.Background()
+		filters := filters.NewArgs()
+		filters.Add("reference", fmt.Sprintf("%s/*:*", repo))
+		images, err := client.ImageList(ctx, types.ImageListOptions{Filters: filters})
+		if err != nil {
+			log.Println(err)
+		}
+
+		var imgRepoTags []string
+		for _, img := range images {
+			imgRepoTags = append(imgRepoTags, img.RepoTags...)
+		}
+
+		// # Iterates through all images that have the name of the repository we are interested in in it
+		for _, image := range imgRepoTags {
+			out, err := client.ImagePull(ctx, image, types.ImagePullOptions{})
+			if err != nil {
+				log.Println(err)
+			}
+			defer out.Close()
+			io.Copy(os.Stdout, out)
+		}
+		log.Println("Update images complete")
+	})
+}