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99 lines
3.3 KiB
Go
99 lines
3.3 KiB
Go
// +build windows
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package windows
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import (
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"errors"
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"fmt"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/daemon/execdriver"
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"github.com/microsoft/hcsshim"
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)
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// Exec implements the exec driver Driver interface.
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func (d *Driver) Exec(c *execdriver.Command, processConfig *execdriver.ProcessConfig, pipes *execdriver.Pipes, hooks execdriver.Hooks) (int, error) {
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var (
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term execdriver.Terminal
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err error
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exitCode int32
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errno uint32
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)
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active := d.activeContainers[c.ID]
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if active == nil {
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return -1, fmt.Errorf("Exec - No active container exists with ID %s", c.ID)
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}
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createProcessParms := hcsshim.CreateProcessParams{
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EmulateConsole: processConfig.Tty, // Note NOT c.ProcessConfig.Tty
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WorkingDirectory: c.WorkingDir,
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}
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// Configure the environment for the process // Note NOT c.ProcessConfig.Tty
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createProcessParms.Environment = setupEnvironmentVariables(processConfig.Env)
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// While this should get caught earlier, just in case, validate that we
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// have something to run.
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if processConfig.Entrypoint == "" {
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err = errors.New("No entrypoint specified")
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logrus.Error(err)
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return -1, err
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}
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// Build the command line of the process
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createProcessParms.CommandLine = processConfig.Entrypoint
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for _, arg := range processConfig.Arguments {
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logrus.Debugln("appending ", arg)
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createProcessParms.CommandLine += " " + arg
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}
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logrus.Debugln("commandLine: ", createProcessParms.CommandLine)
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// Start the command running in the container.
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pid, stdin, stdout, stderr, rc, err := hcsshim.CreateProcessInComputeSystem(c.ID, pipes.Stdin != nil, true, !processConfig.Tty, createProcessParms)
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if err != nil {
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// TODO Windows: TP4 Workaround. In Hyper-V containers, there is a limitation
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// of one exec per container. This should be fixed post TP4. CreateProcessInComputeSystem
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// will return a specific error which we handle here to give a good error message
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// back to the user instead of an inactionable "An invalid argument was supplied"
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if rc == hcsshim.Win32InvalidArgument {
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return -1, fmt.Errorf("The limit of docker execs per Hyper-V container has been exceeded")
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}
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logrus.Errorf("CreateProcessInComputeSystem() failed %s", err)
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return -1, err
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}
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// Now that the process has been launched, begin copying data to and from
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// the named pipes for the std handles.
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setupPipes(stdin, stdout, stderr, pipes)
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// Note NOT c.ProcessConfig.Tty
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if processConfig.Tty {
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term = NewTtyConsole(c.ID, pid)
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} else {
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term = NewStdConsole()
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}
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processConfig.Terminal = term
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// Invoke the start callback
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if hooks.Start != nil {
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// A closed channel for OOM is returned here as it will be
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// non-blocking and return the correct result when read.
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chOOM := make(chan struct{})
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close(chOOM)
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hooks.Start(&c.ProcessConfig, int(pid), chOOM)
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}
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if exitCode, errno, err = hcsshim.WaitForProcessInComputeSystem(c.ID, pid, hcsshim.TimeoutInfinite); err != nil {
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if errno == hcsshim.Win32PipeHasBeenEnded {
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logrus.Debugf("Exiting Run() after WaitForProcessInComputeSystem failed with recognised error 0x%X", errno)
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return hcsshim.WaitErrExecFailed, nil
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}
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logrus.Warnf("WaitForProcessInComputeSystem failed (container may have been killed): 0x%X %s", errno, err)
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return -1, err
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}
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logrus.Debugln("Exiting Run()", c.ID)
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return int(exitCode), nil
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}
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