73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
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// +build linux
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package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"github.com/Sirupsen/logrus"
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"github.com/codegangsta/cli"
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"github.com/opencontainers/specs"
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)
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var execCommand = cli.Command{
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Name: "exec",
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Usage: "execute new process inside the container",
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Action: func(context *cli.Context) {
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config, err := loadProcessConfig(context.Args().First())
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if err != nil {
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fatal(err)
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}
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if os.Geteuid() != 0 {
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logrus.Fatal("runc should be run as root")
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}
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status, err := execProcess(context, config)
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if err != nil {
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logrus.Fatalf("exec failed: %v", err)
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}
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os.Exit(status)
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},
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}
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func execProcess(context *cli.Context, config *specs.Process) (int, error) {
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container, err := getContainer(context)
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if err != nil {
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return -1, err
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}
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process := newProcess(*config)
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rootuid, err := container.Config().HostUID()
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if err != nil {
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return -1, err
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}
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tty, err := newTty(config.Terminal, process, rootuid)
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if err != nil {
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return -1, err
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}
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handler := newSignalHandler(tty)
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defer handler.Close()
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if err := container.Start(process); err != nil {
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return -1, err
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}
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return handler.forward(process)
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}
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// loadProcessConfig loads the process configuration from the provided path.
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func loadProcessConfig(path string) (*specs.Process, error) {
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f, err := os.Open(path)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, fmt.Errorf("JSON configuration file for %s not found", path)
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}
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return nil, err
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}
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defer f.Close()
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var s *specs.Process
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if err := json.NewDecoder(f).Decode(&s); err != nil {
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return nil, err
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}
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return s, nil
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}
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