add ResticRepository CRD and move repo-level actions to a controller

Signed-off-by: Steve Kriss <steve@heptio.com>

pkg/restic/config.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2018 the Heptio Ark contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package restic
+
+import (
+	"fmt"
+	"strings"
+
+	arkv1api "github.com/heptio/ark/pkg/apis/ark/v1"
+)
+
+// getRepoPrefix returns the prefix of the value of the --repo flag for
+// restic commands, i.e. everything except the "/<repo-name>".
+func getRepoPrefix(config arkv1api.ObjectStorageProviderConfig) string {
+	if BackendType(config.Name) == AWSBackend {
+		var url string
+		switch {
+		// non-AWS, S3-compatible object store
+		case config.Config["s3Url"] != "":
+			url = config.Config["s3Url"]
+		default:
+			url = "s3.amazonaws.com"
+		}
+
+		return fmt.Sprintf("s3:%s/%s", url, config.ResticLocation)
+	}
+
+	var (
+		parts        = strings.SplitN(config.ResticLocation, "/", 2)
+		bucket, path string
+	)
+
+	if len(parts) >= 1 {
+		bucket = parts[0]
+	}
+	if len(parts) >= 2 {
+		path = parts[1]
+	}
+
+	var prefix string
+	switch BackendType(config.Name) {
+	case AzureBackend:
+		prefix = "azure"
+	case GCPBackend:
+		prefix = "gs"
+	}
+
+	return fmt.Sprintf("%s:%s:/%s", prefix, bucket, path)
+}
+
+// GetRepoIdentifier returns the string to be used as the value of the --repo flag in
+// restic commands for the given repository.
+func GetRepoIdentifier(config arkv1api.ObjectStorageProviderConfig, name string) string {
+	prefix := getRepoPrefix(config)
+
+	return fmt.Sprintf("%s/%s", strings.TrimSuffix(prefix, "/"), name)
+}