feat: Add ability to push to multiple registries (#303)

Co-authored-by: Robert Kaussow <xoxys@rknet.org>

_docs/content/_index.md

@@ -95,6 +95,36 @@ steps:
       tags: latest
 ```
 
+**Multiple registries:**
+
+```yaml
+kind: pipeline
+name: default
+
+steps:
+  - name: docker
+    image: thegeeklab/drone-docker-buildx:23
+    privileged: true
+    environment:
+      DOCKER_REGISTRY_PASSWORD:
+        from_secret: docker_registry_password
+      GITHUB_REGISTRY_PASSWORD:
+        from_secret: github_registry_password
+    settings:
+      repo: 
+        - octocat/example
+        - ghcr.io/octocat/example
+      tags: latest
+      registries: |
+      registries:                                                                                                                                              
+        - username: "octocat"
+          password: "$DOCKER_REGISTRY_PASSWORD"
+        - registry: "ghcr.io"
+          username: "octocat"
+          password: "$GITHUB_REGISTRY_PASSWORD"
+```
+
+
 ## Build
 
 Build the binary with the following command:

_docs/data/data.yaml

@@ -208,7 +208,7 @@ properties:
     description: |
       Repository name for the image. If the image is to be pushed to registries other than the default DockerHub,
       it is necessary to set `repo` as fully-qualified name.
-    type: string
+    type: list
     required: false
 
   - name: registry
@@ -293,3 +293,8 @@ properties:
       This should be used with caution and avoided whenever possible.
     type: list
     required: false
+
+  - name: registries
+    description: Credentials for multiple registries described in YAML format. Check out the Examples for more information.
+    type: string
+    required: false

cmd/drone-docker-buildx/config.go

@@ -235,7 +235,7 @@ func settingsFlags(settings *plugin.Settings, category string) []cli.Flag {
 			Destination: &settings.Build.Compress,
 			Category:    category,
 		},
-		&cli.StringFlag{
+		&cli.StringSliceFlag{
 			Name:        "repo",
 			EnvVars:     []string{"PLUGIN_REPO"},
 			Usage:       "repository name for the image",
@@ -328,5 +328,12 @@ func settingsFlags(settings *plugin.Settings, category string) []cli.Flag {
 			Value:    &drone.StringSliceFlag{},
 			Category: category,
 		},
+		&cli.StringFlag{
+			Name:        "docker.registries",
+			EnvVars:     []string{"PLUGIN_REGISTRIES"},
+			Usage:       "credentials for registries",
+			Destination: &settings.Login.RegistriesYaml,
+			Category:    category,
+		},
 	}
 }

go.mod

@@ -15,4 +15,5 @@ require (
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+	gopkg.in/yaml.v3 v3.0.1
 )

plugin/docker.go

@@ -11,7 +11,7 @@ import (
 )
 
 // helper function to create the docker login command.
-func commandLogin(login Login) *execabs.Cmd {
+func commandLogin(login RegistryData) *execabs.Cmd {
 	if login.Email != "" {
 		return commandLoginEmail(login)
 	}
@@ -28,7 +28,7 @@ func commandLogin(login Login) *execabs.Cmd {
 	)
 }
 
-func commandLoginEmail(login Login) *execabs.Cmd {
+func commandLoginEmail(login RegistryData) *execabs.Cmd {
 	args := []string{
 		"login",
 		"-u", login.Username,
@@ -140,8 +140,10 @@ func commandBuild(build Build, dryrun bool) *execabs.Cmd {
 		args = append(args, "--platform", strings.Join(build.Platforms.Value(), ","))
 	}
 
-	for _, arg := range build.Tags.Value() {
+	for _, repo := range build.Repo.Value() {
-		args = append(args, "-t", fmt.Sprintf("%s:%s", build.Repo, arg))
+		for _, arg := range build.Tags.Value() {
+			args = append(args, "-t", fmt.Sprintf("%s:%s", repo, arg))
+		}
 	}
 
 	for _, arg := range build.ExtraTags.Value() {

plugin/impl.go

@@ -9,6 +9,7 @@ import (
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 	"golang.org/x/sys/execabs"
+	"gopkg.in/yaml.v3"
 )
 
 // Daemon defines Docker daemon parameters.
@@ -31,11 +32,20 @@ type Daemon struct {
 
 // Login defines Docker login parameters.
 type Login struct {
+	RegistryData
+	Config         string // Docker Auth Config
+	RegistriesYaml string // Docker Auth with YAML config
+}
+
+type RegistryData struct {
 	Registry string // Docker registry address
 	Username string // Docker registry username
 	Password string // Docker registry password
 	Email    string // Docker registry email
-	Config   string // Docker Auth Config
+}
+
+type RegistriesYaml struct {
+	Registries []RegistryData `yaml:"registries"`
 }
 
 // Build defines Docker build parameters.
@@ -56,7 +66,7 @@ type Build struct {
 	CacheFrom    []string        // Docker build cache-from
 	CacheTo      string          // Docker build cache-to
 	Compress     bool            // Docker build compress
-	Repo         string          // Docker build repository
+	Repo         cli.StringSlice // Docker build repositories
 	NoCache      bool            // Docker build no-cache
 	AddHost      cli.StringSlice // Docker build add-host
 	Quiet        bool            // Docker build quiet
@@ -167,7 +177,7 @@ func (p *Plugin) Execute() error {
 
 	// login to the Docker registry
 	if p.settings.Login.Password != "" {
-		cmd := commandLogin(p.settings.Login)
+		cmd := commandLogin(p.settings.Login.RegistryData)
 
 		err := cmd.Run()
 		if err != nil {
@@ -175,6 +185,28 @@ func (p *Plugin) Execute() error {
 		}
 	}
 
+	if p.settings.Login.RegistriesYaml != "" {
+		var t RegistriesYaml
+
+		err := yaml.Unmarshal([]byte(p.settings.Login.RegistriesYaml), &t)
+		if err != nil {
+			return fmt.Errorf("error unmarshal registries: %w", err)
+		}
+
+		for _, registryData := range t.Registries {
+			if registryData.Registry == "" {
+				registryData.Registry = "https://index.docker.io/v1/"
+			}
+
+			cmd := commandLogin(registryData)
+
+			err := cmd.Run()
+			if err != nil {
+				return fmt.Errorf("error authenticating: %w", err)
+			}
+		}
+	}
+
 	if p.settings.Daemon.BuildkitConfig != "" {
 		err := os.WriteFile(buildkitConfig, []byte(p.settings.Daemon.BuildkitConfig), strictFilePerm)
 		if err != nil {
@@ -185,6 +217,8 @@ func (p *Plugin) Execute() error {
 	switch {
 	case p.settings.Login.Password != "":
 		logrus.Info("Detected registry credentials")
+	case p.settings.Login.RegistriesYaml != "":
+		logrus.Info("Detected multiple registry credentials")
 	case p.settings.Login.Config != "":
 		logrus.Info("Detected registry credentials file")
 	default: