英文:
How to switch user in Go from username?
问题
我必须使用给定的用户名执行此命令；在bash中，它应该是这样的：
$su devrim -c "touch miki"
我猜，首先我需要从用户名获取uid，并在执行ForkExec之前使用setuid。
你能给些建议吗？我该如何做？（附注：我没有uid，只有用户名）
func exec(cmd *Command, async bool) os.Error {
parts := strings.Fields(cmd.Command)
command := parts[0]
// cmd.Su holds the username "root" or "myUser"
pid, err := os.ForkExec(command, parts, os.Environ(), "", []*os.File{nil, cmd.Stdout, cmd.Stderr})
cmd.Pid = pid
if !async {
os.Wait(pid, 0)
}
return nil
}
编辑：由于sysuser的方法不起作用，并且我发现它只解析/etc/passwd，所以我决定自己做：
func getUid(su string) int{
passwd,_ := os.Open("/etc/passwd", os.O_RDONLY , 0600)
reader := bufio.NewReader(passwd)
for {
line,err := reader.ReadString('\n')
if err != nil {
println(err.String())
break
}
parsed := strings.Split(line,":",4)
if parsed[0] == su {
value,_ := strconv.Atoi(parsed[2])
return value
}
}
return -1
}
我不确定所有的/etc/passwd在*nix系统中是否都是相同的格式，我们使用Debian和Ubuntu，请小心操作。
英文:
I have to execute this command with given username; in bash it'd be,
$su devrim -c "touch miki"
i guess, first i need to get the uid from the username and use setuid before doing ForkExec.
can u advice? how do i do this ? (ps: i don't have the uid, only username)
func exec(cmd *Command, async bool) os.Error {
parts := strings.Fields(cmd.Command)
command := parts[0]
// cmd.Su holds the username "root" or "myUser"
pid, err := os.ForkExec(command, parts, os.Environ(), "", []*os.File{nil, cmd.Stdout, cmd.Stderr})
cmd.Pid = pid
if !async {
os.Wait(pid, 0)
}
return nil
}
edit: since that sysuser thing didn't work, and i saw that it's only parsing the /etc/passwd i decided to do it myself:
func getUid(su string) int{
passwd,_ := os.Open("/etc/passwd", os.O_RDONLY , 0600)
reader := bufio.NewReader(passwd)
for {
line,err := reader.ReadString('\n')
if err != nil {
println(err.String())
break
}
parsed := strings.Split(line,":",4)
if parsed[0] == su {
value,_ := strconv.Atoi(parsed[2])
return value
}
}
return -1
}
i'm not sure if all /etc/passwd's are formed the same accross *nix's, we use debian and ubuntu, proceed with care.
答案1
得分: 3
这个包 http://github.com/kless/go-sysuser 可以访问用户名等信息。
syscall包有用于设置/获取UID等的调用。
英文:
This package http://github.com/kless/go-sysuser can access the usernames, etc.
The syscall package has calls for Set/Get UID, etc.
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