mirror of https://github.com/perkeep/perkeep.git
46 lines
1.2 KiB
Go
46 lines
1.2 KiB
Go
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/*
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Copyright 2014 The Camlistore 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 main
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import (
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"errors"
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"fmt"
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"camlistore.org/pkg/jsonconfig"
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"camlistore.org/third_party/github.com/bradfitz/gce"
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)
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func init() {
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if !gce.OnGCE() {
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return
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}
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jsonconfig.RegisterFunc("_gce_instance_meta", func(c *jsonconfig.ConfigParser, v []interface{}) (interface{}, error) {
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if len(v) != 1 {
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return nil, errors.New("only 1 argument supported after _gce_instance_meta")
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}
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attr, ok := v[0].(string)
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if !ok {
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return nil, errors.New("expected argument after _gce_instance_meta to be a string")
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}
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val, err := gce.InstanceAttributeValue(attr)
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if err != nil {
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return nil, fmt.Errorf("error reading GCE instance attribute %q: %v", attr, err)
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}
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return val, nil
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})
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}
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