71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
// +build linux
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package native
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import (
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"fmt"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"github.com/docker/docker/daemon/execdriver"
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"github.com/docker/docker/pkg/reexec"
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"github.com/docker/libcontainer"
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"github.com/docker/libcontainer/namespaces"
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)
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const execCommandName = "nsenter-exec"
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func init() {
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reexec.Register(execCommandName, nsenterExec)
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}
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func nsenterExec() {
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runtime.LockOSThread()
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// User args are passed after '--' in the command line.
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userArgs := findUserArgs()
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config, err := loadConfigFromFd()
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if err != nil {
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log.Fatalf("docker-exec: unable to receive config from sync pipe: %s", err)
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}
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if err := namespaces.FinalizeSetns(config, userArgs); err != nil {
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log.Fatalf("docker-exec: failed to exec: %s", err)
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}
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}
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// TODO(vishh): Add support for running in priviledged mode and running as a different user.
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func (d *driver) Exec(c *execdriver.Command, processConfig *execdriver.ProcessConfig, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
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active := d.activeContainers[c.ID]
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if active == nil {
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return -1, fmt.Errorf("No active container exists with ID %s", c.ID)
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}
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state, err := libcontainer.GetState(filepath.Join(d.root, c.ID))
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if err != nil {
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return -1, fmt.Errorf("State unavailable for container with ID %s. The container may have been cleaned up already. Error: %s", c.ID, err)
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}
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var term execdriver.Terminal
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if processConfig.Tty {
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term, err = NewTtyConsole(processConfig, pipes)
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} else {
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term, err = execdriver.NewStdConsole(processConfig, pipes)
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}
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processConfig.Terminal = term
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args := append([]string{processConfig.Entrypoint}, processConfig.Arguments...)
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return namespaces.ExecIn(active.container, state, args, os.Args[0], "exec", processConfig.Stdin, processConfig.Stdout, processConfig.Stderr, processConfig.Console,
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func(cmd *exec.Cmd) {
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if startCallback != nil {
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startCallback(&c.ProcessConfig, cmd.Process.Pid)
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}
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})
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}
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