112 lines
3.3 KiB
Bash
112 lines
3.3 KiB
Bash
#!/bin/bash
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set -euxo pipefail
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nexus_domain=$(hostname --fqdn)
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docker_group_registry_host="$nexus_domain:5001"
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docker_hosted_registry_host="$nexus_domain:5003"
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registry_username='alice.doe'
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registry_password='password'
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# login into the registry.
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echo "logging in the registry $docker_group_registry_host..."
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docker login $docker_group_registry_host --username "$registry_username" --password-stdin <<EOF
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$registry_password
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EOF
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echo "logging in the registry $docker_hosted_registry_host..."
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docker login $docker_hosted_registry_host --username "$registry_username" --password-stdin <<EOF
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$registry_password
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EOF
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mkdir -p tmp/use-docker-repository && cd tmp/use-docker-repository
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#
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# test the docker repository.
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# see https://github.com/golang/go/tags
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# renovate: datasource=github-tags depName=golang/go extractVersion=go(?<version>.+)
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go_version='1.25.1'
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cat >main.go <<'EOF'
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package main
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import (
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"fmt"
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"flag"
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"log"
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"net/http"
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)
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func main() {
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log.SetFlags(0)
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var listenAddress = flag.String("listen", ":8000", "Listen address.")
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flag.Parse()
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if flag.NArg() != 0 {
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flag.Usage()
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log.Fatalf("\nERROR You MUST NOT pass any positional arguments")
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}
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain")
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fmt.Printf("%s %s%s\n", r.Method, r.Host, r.URL)
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fmt.Fprintf(w, "%s %s%s\n", r.Method, r.Host, r.URL)
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})
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fmt.Printf("Listening at http://%s\n", *listenAddress)
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err := http.ListenAndServe(*listenAddress, nil)
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if err != nil {
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log.Fatalf("Failed to ListenAndServe: %v", err)
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}
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}
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EOF
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cat >go.mod <<EOF
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module example.com/go-hello
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go $go_version
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EOF
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cat >Dockerfile <<EOF
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FROM golang:$go_version-bookworm AS builder
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WORKDIR /app
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COPY go.* main.go ./
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RUN CGO_ENABLED=0 go build -ldflags="-s"
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# NB we use the buster-slim (instead of scratch) image so we
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# can enter the container to execute bash etc.
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FROM debian:bookworm-slim
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COPY --from=builder /app/go-hello .
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WORKDIR /
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EXPOSE 8000
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ENTRYPOINT ["/go-hello"]
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EOF
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# build the image.
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docker build -t go-hello:1.0.0 .
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docker image ls go-hello:1.0.0
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# push the image to the docker-hosted registry.
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docker tag go-hello:1.0.0 $docker_hosted_registry_host/go-hello:1.0.0
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docker push $docker_hosted_registry_host/go-hello:1.0.0
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# show the repository (image) details directly from the docker-hosted registry.
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# see https://docs.docker.com/registry/spec/api/
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# see https://docs.docker.com/registry/spec/manifest-v2-2/
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wget -qO- --user "$registry_username" --password "$registry_password" \
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"https://$docker_hosted_registry_host/v2/go-hello/tags/list" | jq .
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manifest=$(wget -qO- --user "$registry_username" --password "$registry_password" \
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'--header=Accept: application/vnd.docker.distribution.manifest.v2+json' \
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"https://$docker_hosted_registry_host/v2/go-hello/manifests/1.0.0")
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config_digest=$(echo "$manifest" | jq -r .config.digest)
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echo "$manifest" | jq .
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wget -qO- --user "$registry_username" --password "$registry_password" \
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"https://$docker_hosted_registry_host/v2/go-hello/blobs/$config_digest" | jq .
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# remove it from local cache.
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docker image remove go-hello:1.0.0
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docker image remove $docker_hosted_registry_host/go-hello:1.0.0
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# pull it from the docker-group registry.
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docker pull $docker_group_registry_host/go-hello:1.0.0
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