53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package system
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import (
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"fmt"
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"reflect"
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"github.com/coreos/coreos-cloudinit/config"
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)
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// serviceContents generates the contents for a drop-in unit given the config.
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// The argument must be a struct from the 'config' package.
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func serviceContents(e interface{}) string {
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vars := getEnvVars(e)
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if len(vars) == 0 {
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return ""
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}
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out := "[Service]\n"
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for _, v := range vars {
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out += fmt.Sprintf("Environment=\"%s\"\n", v)
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}
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return out
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}
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func getEnvVars(e interface{}) []string {
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et := reflect.TypeOf(e)
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ev := reflect.ValueOf(e)
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vars := []string{}
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for i := 0; i < et.NumField(); i++ {
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if val := ev.Field(i).Interface(); !config.IsZero(val) {
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key := et.Field(i).Tag.Get("env")
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vars = append(vars, fmt.Sprintf("%s=%v", key, val))
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}
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}
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return vars
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}
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