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util.go
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/
util.go
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// Copyright 2018 Percona LLC
//
// 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 internal
import (
"io/ioutil"
"os"
"os/user"
"path/filepath"
"runtime"
"strconv"
"strings"
log "github.com/sirupsen/logrus"
)
// GetUserID returns the numeric ID of a system user
func GetUserID(userName string) (int, error) {
u, err := user.Lookup(userName)
if err != nil {
return -1, err
}
return strconv.Atoi(u.Uid)
}
// GetGroupID returns the numeric ID of a system group
func GetGroupID(groupName string) (int, error) {
g, err := user.LookupGroup(groupName)
if err != nil {
return -1, err
}
return strconv.Atoi(g.Gid)
}
// RelPathToAbs returns a string containing a absolute to the provided path, relative to the caller directory
func RelPathToAbs(relPath string) string {
_, filename, _, ok := runtime.Caller(1)
if !ok {
return ""
}
baseDir := filepath.Dir(filename)
path, err := filepath.Abs(filepath.Join(baseDir, relPath))
if err == nil {
if _, err := os.Stat(path); err == nil {
return path
}
}
return ""
}
// StringFromFile returns a string using the contents of an existing filename
func StringFromFile(fileName string) *string {
if _, err := os.Stat(fileName); err == nil {
file, err := os.Open(fileName)
if err != nil {
return nil
}
defer file.Close()
bytes, err := ioutil.ReadAll(file)
if err == nil {
data := strings.TrimSpace(string(bytes))
return &data
}
}
return nil
}
// PasswordFromFile loads a password from file
func PasswordFromFile(baseDir, password, passwordName string) string {
passwordFile := filepath.Join(baseDir, password)
passwd := StringFromFile(passwordFile)
if passwd != nil {
log.Infof("Loaded %s password from file %s", passwordName, passwordFile)
return *passwd
}
log.Errorf("Cannot load %s password from file %s", passwordName, passwordFile)
return ""
}