mirror of
https://github.com/gravitational/teleport
synced 2024-10-21 09:44:51 +00:00
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
/*
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Copyright 2015 Gravitational, Inc.
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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 service
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"strings"
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"text/template"
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"github.com/gravitational/trace"
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)
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func renderTemplate(data []byte) ([]byte, error) {
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t, err := template.New("tpl").Parse(string(data))
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if err != nil {
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return nil, trace.Wrap(err)
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}
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buf := &bytes.Buffer{}
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c, err := newCtx()
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if err != nil {
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return nil, trace.Wrap(err)
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}
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if err := t.Execute(buf, c); err != nil {
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return nil, trace.Wrap(err)
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}
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return buf.Bytes(), nil
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}
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func newCtx() (*ctx, error) {
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values := os.Environ()
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c := &ctx{
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env: make(map[string]string, len(values)),
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}
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for _, v := range values {
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vals := strings.SplitN(v, "=", 2)
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if len(vals) != 2 {
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return nil, trace.Errorf("failed to parse variable: '%v'", v)
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}
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c.env[vals[0]] = vals[1]
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}
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return c, nil
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}
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type ctx struct {
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env map[string]string
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}
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func (c *ctx) File(path string) (string, error) {
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o, err := ioutil.ReadFile(path)
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if err != nil {
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return "", trace.Wrap(err, fmt.Sprintf("reading file: %v", path))
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}
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return string(o), nil
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}
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