blob: dcf0eddf56eecc3626fb5fc77f814528e42b69fc [file] [log] [blame]
package sysinit
import (
"encoding/json"
"flag"
"fmt"
"github.com/dotcloud/docker/execdriver"
_ "github.com/dotcloud/docker/execdriver/chroot"
_ "github.com/dotcloud/docker/execdriver/lxc"
"io/ioutil"
"log"
"os"
"strings"
)
// Clear environment pollution introduced by lxc-start
func setupEnv(args *execdriver.InitArgs) {
os.Clearenv()
for _, kv := range args.Env {
parts := strings.SplitN(kv, "=", 2)
if len(parts) == 1 {
parts = append(parts, "")
}
os.Setenv(parts[0], parts[1])
}
}
func executeProgram(args *execdriver.InitArgs) error {
setupEnv(args)
dockerInitFct, err := execdriver.GetInitFunc(args.Driver)
if err != nil {
panic(err)
}
return dockerInitFct(args)
if args.Driver == "lxc" {
// Will never reach
} else if args.Driver == "chroot" {
}
return nil
}
// Sys Init code
// This code is run INSIDE the container and is responsible for setting
// up the environment before running the actual process
func SysInit() {
if len(os.Args) <= 1 {
fmt.Println("You should not invoke dockerinit manually")
os.Exit(1)
}
var (
// Get cmdline arguments
user = flag.String("u", "", "username or uid")
gateway = flag.String("g", "", "gateway address")
ip = flag.String("i", "", "ip address")
workDir = flag.String("w", "", "workdir")
privileged = flag.Bool("privileged", false, "privileged mode")
mtu = flag.Int("mtu", 1500, "interface mtu")
driver = flag.String("driver", "", "exec driver")
)
flag.Parse()
// Get env
var env []string
content, err := ioutil.ReadFile("/.dockerenv")
if err != nil {
log.Fatalf("Unable to load environment variables: %v", err)
}
if err := json.Unmarshal(content, &env); err != nil {
log.Fatalf("Unable to unmarshal environment variables: %v", err)
}
// Propagate the plugin-specific container env variable
env = append(env, "container="+os.Getenv("container"))
args := &execdriver.InitArgs{
User: *user,
Gateway: *gateway,
Ip: *ip,
WorkDir: *workDir,
Privileged: *privileged,
Env: env,
Args: flag.Args(),
Mtu: *mtu,
Driver: *driver,
}
if err := executeProgram(args); err != nil {
log.Fatal(err)
}
}