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process.go
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process.go
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// Copyright © 2014 Terry Mao, LiuDing All rights reserved.
// This file is part of gopush-cluster.
// gopush-cluster is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// gopush-cluster is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with gopush-cluster. If not, see <http://www.gnu.org/licenses/>.
package process
import (
"fmt"
"io/ioutil"
"os"
"os/user"
"strconv"
"strings"
"syscall"
)
const (
defaultUser = "nobody"
defaultGroup = "nobody"
)
// Init create pid file, set working dir, setgid and setuid.
func Init(userGroup, dir, pidFile string) error {
// change working dir
if err := os.Chdir(dir); err != nil {
return err
}
// create pid file
if err := ioutil.WriteFile(pidFile, []byte(fmt.Sprintf("%d\n", os.Getpid())), 0644); err != nil {
return err
}
// setuid and setgid
ug := strings.SplitN(userGroup, " ", 2)
usr := defaultUser
grp := defaultGroup
if len(ug) == 0 {
// default user and group (nobody)
} else if len(ug) == 1 {
usr = ug[0]
grp = ""
} else if len(ug) == 2 {
usr = ug[0]
grp = ug[1]
}
uid := 0
gid := 0
ui, err := user.Lookup(usr)
if err != nil {
return err
}
uid, _ = strconv.Atoi(ui.Uid)
// group no set
if grp == "" {
gid, _ = strconv.Atoi(ui.Gid)
} else {
// use user's group instread
// TODO LookupGroup
gid, _ = strconv.Atoi(ui.Gid)
}
if err := syscall.Setgid(gid); err != nil {
return err
}
if err := syscall.Setuid(uid); err != nil {
return err
}
return nil
}