Initial v1.0.0 commit

vendor/k8s.io/helm/pkg/version/compatible.go

@@ -0,0 +1,65 @@
+/*
+Copyright The Helm Authors.
+
+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 version // import "k8s.io/helm/pkg/version"
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/Masterminds/semver"
+)
+
+// IsCompatible tests if a client and server version are compatible.
+func IsCompatible(client, server string) bool {
+	if isUnreleased(client) || isUnreleased(server) {
+		return true
+	}
+	cv, err := semver.NewVersion(client)
+	if err != nil {
+		return false
+	}
+	sv, err := semver.NewVersion(server)
+	if err != nil {
+		return false
+	}
+
+	constraint := fmt.Sprintf("^%d.%d.x", cv.Major(), cv.Minor())
+	if cv.Prerelease() != "" || sv.Prerelease() != "" {
+		constraint = cv.String()
+	}
+
+	return IsCompatibleRange(constraint, server)
+}
+
+// IsCompatibleRange compares a version to a constraint.
+// It returns true if the version matches the constraint, and false in all other cases.
+func IsCompatibleRange(constraint, ver string) bool {
+	sv, err := semver.NewVersion(ver)
+	if err != nil {
+		return false
+	}
+
+	c, err := semver.NewConstraint(constraint)
+	if err != nil {
+		return false
+	}
+	return c.Check(sv)
+}
+
+func isUnreleased(v string) bool {
+	return strings.HasSuffix(v, "unreleased")
+}