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etcconf.go
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etcconf.go
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// Copyright 2016 VMware, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package etcconf
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"path"
"strings"
log "github.com/Sirupsen/logrus"
)
type EntryConsumer interface {
ConsumeEntry(string) error
}
type EntryWalker interface {
HasNext() bool
Next() string
}
type Conf interface {
Copy(Conf) error
Load() error
Save() error
Path() string
}
func load(filePath string, con EntryConsumer) error {
f, err := os.Open(filePath)
if err != nil {
if os.IsNotExist(err) {
log.Infof("not loading file %s as it does not exist", filePath)
return nil
}
return err
}
// #nosec: Errors unhandled
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
t := strings.TrimSpace(s.Text())
if t == "" || strings.HasPrefix(t, "#") {
continue
}
if err = con.ConsumeEntry(t); err != nil {
return err
}
}
return nil
}
func save(filePath string, walker EntryWalker) error {
f, err := ioutil.TempFile(path.Dir(filePath), path.Base(filePath))
if err != nil {
return err
}
defer os.Remove(f.Name())
w := bufio.NewWriter(f)
for walker.HasNext() {
l := fmt.Sprintf("%s\n", walker.Next())
log.Debugf("writing %q to %s", l, filePath)
var n int
for n < len(l) {
b, err := w.WriteString(l[n:])
if err != nil {
// #nosec: Errors unhandled
_ = f.Close()
return err
}
n += b
}
}
if err = w.Flush(); err != nil {
// #nosec: Errors unhandled
_ = f.Close()
log.Errorf("Unable to flush file content to %s: %s", f.Name(), err)
return err
}
if err = f.Close(); err != nil {
log.Errorf("Error closing file %s: %s", f.Name(), err)
return err
}
if err = os.Rename(f.Name(), filePath); err != nil {
log.Errorf("Unable to rename tempory file into final location %s->%s: %s", f.Name(), filePath, err)
return err
}
return nil
}