mirror of https://github.com/perkeep/perkeep.git
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// +build !js
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/*
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Copyright 2017 The Perkeep 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 env
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import (
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"sync"
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"cloud.google.com/go/compute/metadata"
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)
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// TODO(mpl): report to the gopherjs project that the
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// generated javascript breaks as soon as we import things such as
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// "cloud.google.com/go/compute/metadata", which is why this whole file exists
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// under this build tag.
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// Keeping https://github.com/perkeep/perkeep/issues/904 open until this
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// is reported.
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// OnGCE reports whether this process is running in a Google Compute
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// Engine (GCE) environment. This only returns true if the
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// "camlistore-config-dir" instance metadata value is defined.
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// Instances running in custom configs on GCE will be unaffected.
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func OnGCE() bool {
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gceOnce.Do(detectGCE)
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return isGCE
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}
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var (
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gceOnce sync.Once
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isGCE bool
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)
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func detectGCE() {
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if !metadata.OnGCE() {
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return
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}
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v, _ := metadata.InstanceAttributeValue("camlistore-config-dir")
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isGCE = v != ""
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}
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