add http head based digest comparison to avoid dockerhub rate limits

pkg/registry/digest/digest_test.go

@@ -0,0 +1,87 @@
+package digest_test
+
+import (
+	"fmt"
+	"github.com/containrrr/watchtower/internal/actions/mocks"
+	"github.com/containrrr/watchtower/pkg/registry/digest"
+	wtTypes "github.com/containrrr/watchtower/pkg/types"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestDigest(t *testing.T) {
+
+	RegisterFailHandler(Fail)
+	RunSpecs(GinkgoT(), "Digest Suite")
+}
+
+var DockerHubCredentials = &wtTypes.RegistryCredentials{
+	Username: os.Getenv("CI_INTEGRATION_TEST_REGISTRY_DH_USERNAME"),
+	Password: os.Getenv("CI_INTEGRATION_TEST_REGISTRY_DH_PASSWORD"),
+}
+var GHCRCredentials = &wtTypes.RegistryCredentials{
+	Username: os.Getenv("CI_INTEGRATION_TEST_REGISTRY_GH_USERNAME"),
+	Password: os.Getenv("CI_INTEGRATION_TEST_REGISTRY_GH_PASSWORD"),
+}
+
+func SkipIfCredentialsEmpty(credentials *wtTypes.RegistryCredentials, fn func()) func() {
+	if credentials.Username == "" {
+		return func() {
+			Skip("Username missing. Skipping integration test")
+		}
+	} else if credentials.Password == "" {
+		return func() {
+			Skip("Password missing. Skipping integration test")
+		}
+	} else {
+		return fn
+	}
+}
+
+var _ = Describe("Digests", func() {
+	mockId := "mock-id"
+	mockName := "mock-container"
+	mockImage := "ghcr.io/k6io/operator:latest"
+	mockCreated := time.Now()
+	mockDigest := "ghcr.io/k6io/operator@sha256:d68e1e532088964195ad3a0a71526bc2f11a78de0def85629beb75e2265f0547"
+
+	mockContainer := mocks.CreateMockContainerWithDigest(
+		mockId,
+		mockName,
+		mockImage,
+		mockCreated,
+		mockDigest)
+
+	When("a digest comparison is done", func() {
+		It("should return true if digests match",
+			SkipIfCredentialsEmpty(GHCRCredentials, func() {
+				creds := fmt.Sprintf("%s:%s", GHCRCredentials.Username, GHCRCredentials.Password)
+				matches, err := digest.CompareDigest(mockContainer, creds)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(matches).To(Equal(true))
+			}),
+		)
+
+		It("should return false if digests differ", func() {
+
+		})
+		It("should return an error if the registry isn't available", func() {
+
+		})
+	})
+	When("using different registries", func() {
+		It("should work with DockerHub",
+			SkipIfCredentialsEmpty(DockerHubCredentials, func() {
+				fmt.Println(DockerHubCredentials != nil) // to avoid crying linters
+			}),
+		)
+		It("should work with GitHub Container Registry",
+			SkipIfCredentialsEmpty(GHCRCredentials, func() {
+				fmt.Println(GHCRCredentials != nil) // to avoid crying linters
+			}),
+		)
+	})
+})