Docker Buildx support

.drone.yml

@@ -0,0 +1,83 @@
+---
+kind: pipeline
+name: testing
+type: vm
+
+pool:
+  use: ubuntu
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+  - name: vet
+    image: golang:1.17
+    commands:
+      - go vet ./...
+    environment:
+
+    volumes:
+      - name: gopath
+        path: /go
+
+volumes:
+  - name: gopath
+    temp: {}
+
+trigger:
+  ref:
+    - refs/heads/main
+    - "refs/tags/**"
+    - "refs/pull/**"
+
+---
+
+kind: pipeline
+name: release-binaries
+type: vm
+
+pool:
+  use: ubuntu
+
+steps:
+  - name: build
+    pull: always
+    image: golang:1.19
+    commands:
+      - GOOS=linux   GOARCH=amd64   go build -ldflags "-s -w" -a -tags netgo -o release/drone-buildx-gcr-linux-amd64 ./cmd/drone-buildx-gcr
+      - GOOS=linux   GOARCH=arm64   go build -ldflags "-s -w" -a -tags netgo -o release/drone-buildx-gcr-linux-arm64 ./cmd/drone-buildx-gcr
+      - GOOS=darwin  GOARCH=amd64   go build -ldflags "-s -w" -a -tags netgo -o release/drone-buildx-gcr-darwin-amd64 ./cmd/drone-buildx-gcr
+      - GOOS=darwin  GOARCH=arm64   go build -ldflags "-s -w" -a -tags netgo -o release/drone-buildx-gcr-darwin-arm64 ./cmd/drone-buildx-gcr
+      - GOOS=windows GOARCH=amd64   go build -ldflags "-s -w" -a -tags netgo -o release/drone-buildx-gcr-windows-amd64.exe ./cmd/drone-buildx-gcr
+
+    environment:
+      CGO_ENABLED: 0
+      GO111MODULE: on
+
+  - name: zstd-compress
+    commands:
+      - sudo apt-get update -y
+      - sudo apt-get install -y zstd
+      - zstd release/drone-buildx-gcr-linux-amd64
+      - zstd release/drone-buildx-gcr-linux-arm64
+      - zstd release/drone-buildx-gcr-darwin-arm64
+      - zstd release/drone-buildx-gcr-darwin-amd64
+      - zstd release/drone-buildx-gcr-windows-amd64.exe
+
+  - name: release
+    image: plugins/github-release
+    settings:
+      files:
+        - release/drone-buildx-gcr-linux-amd64.zst
+        - release/drone-buildx-gcr-linux-arm64.zst
+        - release/drone-buildx-gcr-darwin-arm64.zst
+        - release/drone-buildx-gcr-darwin-amd64.zst
+        - release/drone-buildx-gcr-windows-amd64.exe.zst
+      api_key:
+        from_secret: github_token
+    when:
+      event:
+        - tag
+depends_on:
+  - testing

cmd/drone-buildx-gcr/main.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"encoding/base64"
+	"os"
+	"path"
+	"strings"
+
+	docker "github.com/drone-plugins/drone-buildx"
+	"github.com/joho/godotenv"
+)
+
+// gcr default username
+const username = "_json_key"
+
+func main() {
+	// Load env-file if it exists first
+	if env := os.Getenv("PLUGIN_ENV_FILE"); env != "" {
+		godotenv.Load(env)
+	}
+
+	var (
+		repo     = getenv("PLUGIN_REPO")
+		registry = getenv("PLUGIN_REGISTRY")
+		password = getenv(
+			"PLUGIN_JSON_KEY",
+			"GCR_JSON_KEY",
+			"GOOGLE_CREDENTIALS",
+			"TOKEN",
+		)
+	)
+
+	// decode the token if base64 encoded
+	decoded, err := base64.StdEncoding.DecodeString(password)
+	if err == nil {
+		password = string(decoded)
+	}
+
+	// default registry value
+	if registry == "" {
+		registry = "gcr.io"
+	}
+
+	// must use the fully qualified repo name. If the
+	// repo name does not have the registry prefix we
+	// should prepend.
+	if !strings.HasPrefix(repo, registry) {
+		repo = path.Join(registry, repo)
+	}
+
+	os.Setenv("PLUGIN_REPO", repo)
+	os.Setenv("PLUGIN_REGISTRY", registry)
+	os.Setenv("DOCKER_USERNAME", username)
+	os.Setenv("DOCKER_PASSWORD", password)
+	os.Setenv("PLUGIN_REGISTRY_TYPE", "GCR")
+
+	// invoke the base docker plugin binary
+	docker.Run()
+}
+
+func getenv(key ...string) (s string) {
+	for _, k := range key {
+		s = os.Getenv(k)
+		if s != "" {
+			return
+		}
+	}
+	return
+}

go.mod

@@ -0,0 +1,20 @@
+module github.com/drone-plugins/drone-buildx-gcr
+
+go 1.19
+
+require (
+	github.com/joho/godotenv v1.5.1
+)
+
+require (
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/drone-plugins/drone-buildx v1.0.2-0.20230512061850-99d0da95877e // indirect
+	github.com/drone-plugins/drone-plugin-lib v0.4.1 // indirect
+	github.com/drone/drone-go v1.7.1 // indirect
+	github.com/inhies/go-bytesize v0.0.0-20210819104631-275770b98743 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/urfave/cli v1.22.2 // indirect
+	golang.org/x/sys v0.0.0-20220731174439-a90be440212d // indirect
+)

go.sum

@@ -0,0 +1,42 @@
+github.com/99designs/httpsignatures-go v0.0.0-20170731043157-88528bf4ca7e/go.mod h1:Xa6lInWHNQnuWoF0YPSsx+INFA9qk7/7pTjwb3PInkY=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
+github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
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