add support for azure blob storage

Author: Keerthan Mala

README.md

@@ -44,19 +44,21 @@ Before deploying your custom image you must update the container image specifica
               value: "true"
 ```
 
-By default registry uses the filesystem as the storage medium. To use a custom object store like s3 or gcs:
+By default registry uses the filesystem as the storage medium. To use a custom object store like s3, gcs or azure:
 - First provide the details required for authenticating to object store in base64 format by updating the secret file which can be found at `contrib/kubernetes/manifests/registry-{STORAGE_TYPE}-secret.yaml`.
-- Set the STORAGE_TYPE environment variable.
-```
-$ export STORAGE_TYPE = {s3/gcs}
-```
-- Update the secret to be used in the pod manifest. This file is found at `contrib/kubernetes/manifests/registry-rc.yaml`:
+- Update the storage type and secret to be used in the pod manifest. This file is found at `contrib/kubernetes/manifests/registry-rc.yaml`:
 ```yaml
+        - name: REGISTRY_STORAGE
+          value: filesystem
+          
         - name: registry-creds
           secret:
             secretName: fs-keyfile
 ```
-
+- Set the STORAGE_TYPE environment variable.
+```
+$ export STORAGE_TYPE = {s3/gcs/azure}
+```
 
 Once updated, deploy the registry to your kubernetes cluster with:
 

contrib/kubernetes/manifests/registry-azure-secret.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: azure-keyfile
+type: Opaque
+data:
+  accountname : {base64-encoded account name}
+  accountkey : {base64-encoded primary or secondary account key}
+  container : {base64-encoded container name}

main.go

@@ -49,6 +49,25 @@ func main() {
 		} else {
 			os.Setenv("REGISTRY_STORAGE_S3_BUCKET", string(bucket))
 		}
+	} else if storageType == "azure" {
+		if accountname, err := ioutil.ReadFile("/var/run/secrets/deis/registry/creds/accountname"); err != nil {
+			log.Fatal(err)
+		} else {
+			os.Setenv("REGISTRY_STORAGE_AZURE_ACCOUNTNAME", string(accountname))
+		}
+
+		if accountkey, err := ioutil.ReadFile("/var/run/secrets/deis/registry/creds/accountkey"); err != nil {
+			log.Fatal(err)
+		} else {
+			os.Setenv("REGISTRY_STORAGE_AZURE_ACCOUNTKEY", string(accountkey))
+		}
+
+		if container, err := ioutil.ReadFile("/var/run/secrets/deis/registry/creds/container"); err != nil {
+			log.Fatal(err)
+		} else {
+			os.Setenv("REGISTRY_STORAGE_AZURE_CONTAINER", string(container))
+		}
+
 	}
 
 	cmd := exec.Command(registryBinary, registryConfig)