mirror of https://github.com/knative/caching.git
63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
/*
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Copyright 2019 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package system
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import (
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"fmt"
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"os"
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)
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const (
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// NamespaceEnvKey is the environment variable that specifies the system namespace.
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NamespaceEnvKey = "SYSTEM_NAMESPACE"
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// ResourceLabelEnvKey is the environment variable that specifies the system resource
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// label.
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ResourceLabelEnvKey = "SYSTEM_RESOURCE_LABEL"
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)
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// Namespace returns the name of the K8s namespace where our system components
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// run.
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func Namespace() string {
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if ns := os.Getenv(NamespaceEnvKey); ns != "" {
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return ns
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}
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panic(fmt.Sprintf(`The environment variable %q is not set
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If this is a process running on Kubernetes, then it should be using the downward
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API to initialize this variable via:
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env:
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- name: %s
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valueFrom:
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fieldRef:
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fieldPath: metadata.namespace
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If this is a Go unit test consuming system.Namespace() then it should add the
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following import:
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import (
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_ "knative.dev/pkg/system/testing"
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)`, NamespaceEnvKey, NamespaceEnvKey))
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}
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// ResourceLabel returns the label key identifying K8s objects our system
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// components source their configuration from.
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func ResourceLabel() string {
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return os.Getenv(ResourceLabelEnvKey)
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}
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