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package main
import (
"fmt"
"os"
liblxc "gopkg.in/lxc/go-lxc.v2"
"github.com/spf13/cobra"
"golang.org/x/sys/unix"
"github.com/canonical/lxd/shared"
"github.com/canonical/lxd/shared/linux"
)
type cmdForkstart struct {
global *cmdGlobal
}
func (c *cmdForkstart) Command() *cobra.Command {
// Main subcommand
cmd := &cobra.Command{}
cmd.Use = "forkstart <container name> <containers path> <config>"
cmd.Short = "Start the container"
cmd.Long = `Description:
Start the container
This internal command is used to start the container as a separate
process.
`
cmd.RunE = c.Run
cmd.Hidden = true
return cmd
}
func (c *cmdForkstart) Run(cmd *cobra.Command, args []string) error {
// Quick checks.
if len(args) != 3 {
_ = cmd.Help()
if len(args) == 0 {
return nil
}
return fmt.Errorf("Missing required arguments")
}
// Only root should run this
if os.Geteuid() != 0 {
return fmt.Errorf("This must be run as root")
}
name := args[0]
lxcpath := args[1]
configPath := args[2]
err := linux.CloseRange(uint32(os.Stderr.Fd())+1, ^uint32(0), linux.CLOSE_RANGE_CLOEXEC)
if err != nil {
return fmt.Errorf("Aborting attach to prevent leaking file descriptors into container")
}
d, err := liblxc.NewContainer(name, lxcpath)
if err != nil {
return fmt.Errorf("Error initializing container for start: %q", err)
}
err = d.LoadConfigFile(configPath)
if err != nil {
return fmt.Errorf("Error opening startup config file: %q", err)
}
/* due to https://github.com/golang/go/issues/13155 and the
* CollectOutput call we make for the forkstart process, we need to
* close our stdin/stdout/stderr here. Collecting some of the logs is
* better than collecting no logs, though.
*/
_ = os.Stdin.Close()
_ = os.Stderr.Close()
_ = os.Stdout.Close()
// Redirect stdout and stderr to a log file
logPath := shared.LogPath(name, "forkstart.log")
if shared.PathExists(logPath) {
_ = os.Remove(logPath)
}
logFile, err := os.OpenFile(logPath, os.O_WRONLY|os.O_CREATE|os.O_SYNC, 0644)
if err == nil {
_ = unix.Dup3(int(logFile.Fd()), 1, 0)
_ = unix.Dup3(int(logFile.Fd()), 2, 0)
}
return d.Start()
}
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