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package main
import (
"os"
"github.com/moby/sys/user"
"golang.org/x/sys/unix"
)
// this function comes from libcontainer/init_linux.go
// we don't use that directly because we don't want the whole namespaces package imported here
// (also, because we need minor modifications and it's not even exported)
// SetupUser changes the groups, gid, and uid for the user inside the container
func SetupUser(u string) error {
// Set up defaults.
defaultExecUser := user.ExecUser{
Uid: unix.Getuid(),
Gid: unix.Getgid(),
Home: "/",
}
passwdPath, err := user.GetPasswdPath()
if err != nil {
return err
}
groupPath, err := user.GetGroupPath()
if err != nil {
return err
}
execUser, err := user.GetExecUserPath(u, &defaultExecUser, passwdPath, groupPath)
if err != nil {
return err
}
if err := unix.Setgroups(execUser.Sgids); err != nil {
return err
}
if err := unix.Setgid(execUser.Gid); err != nil {
return err
}
if err := unix.Setuid(execUser.Uid); err != nil {
return err
}
// if we didn't get HOME already, set it based on the user's HOME
if envHome := os.Getenv("HOME"); envHome == "" {
if err := os.Setenv("HOME", execUser.Home); err != nil {
return err
}
}
return nil
}
|
