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package main
import (
"fmt"
"os"
"strconv"
"sync"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/libpod"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var (
startFlags = []cli.Flag{
cli.BoolFlag{
Name: "attach, a",
Usage: "Attach container's STDOUT and STDERR",
},
cli.StringFlag{
Name: "detach-keys",
Usage: "Override the key sequence for detaching a container. Format is a single character [a-Z] or ctrl-<value> where <value> is one of: a-z, @, ^, [, , or _.",
},
cli.BoolFlag{
Name: "interactive, i",
Usage: "Keep STDIN open even if not attached",
},
LatestFlag,
}
startDescription = `
podman start
Starts one or more containers. The container name or ID can be used.
`
startCommand = cli.Command{
Name: "start",
Usage: "Start one or more containers",
Description: startDescription,
Flags: startFlags,
Action: startCmd,
ArgsUsage: "CONTAINER-NAME [CONTAINER-NAME ...]",
UseShortOptionHandling: true,
}
)
func startCmd(c *cli.Context) error {
args := c.Args()
if len(args) < 1 && !c.Bool("latest") {
return errors.Errorf("you must provide at least one container name or id")
}
attach := c.Bool("attach")
if len(args) > 1 && attach {
return errors.Errorf("you cannot start and attach multiple containers at once")
}
if err := validateFlags(c, startFlags); err != nil {
return err
}
runtime, err := getRuntime(c)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
if c.Bool("latest") {
lastCtr, err := runtime.GetLatestContainer()
if err != nil {
return errors.Wrapf(err, "unable to get latest container")
}
args = append(args, lastCtr.ID())
}
var lastError error
for _, container := range args {
// Create a bool channel to track that the console socket attach
// is successful.
attached := make(chan bool)
// Create a waitgroup so we can sync and wait for all goroutines
// to finish before exiting main
var wg sync.WaitGroup
ctr, err := runtime.LookupContainer(container)
if err != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = errors.Wrapf(err, "unable to find container %s", container)
continue
}
if err := ctr.Init(); err != nil && errors.Cause(err) != libpod.ErrCtrExists {
return err
}
// We can only be interactive if both the config and the command-line say so
if c.Bool("interactive") && !ctr.Config().Stdin {
return errors.Errorf("the container was not created with the interactive option")
}
noStdIn := c.Bool("interactive")
tty, err := strconv.ParseBool(ctr.Spec().Annotations["io.kubernetes.cri-o.TTY"])
if err != nil {
return errors.Wrapf(err, "unable to parse annotations in %s", ctr.ID())
}
err = ctr.Start()
if err != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = errors.Wrapf(err, "unable to start %s", container)
continue
}
// We only get a terminal session if both a tty was specified in the spec and
// -a on the command-line was given.
// Must be done after Start() because we might be restarting
// If so, the attach socket might be removed & recreated
if attach && tty {
// We increment the wg counter because we need to do the attach
wg.Add(1)
// Attach to the running container
go func() {
logrus.Debugf("trying to attach to the container %s", ctr.ID())
defer wg.Done()
if err := ctr.Attach(noStdIn, c.String("detach-keys"), attached); err != nil {
logrus.Errorf("unable to attach to container %s: %q", ctr.ID(), err)
}
}()
if !<-attached {
return errors.Errorf("unable to attach to container %s", ctr.ID())
}
}
if !attach {
fmt.Println(ctr.ID())
}
wg.Wait()
if ecode, err := ctr.ExitCode(); err != nil {
logrus.Errorf("unable to get exit code of container %s: %q", ctr.ID(), err)
} else {
exitCode = int(ecode)
}
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
// We can only do this if we attached
// Otherwise the container is probably still running
if attach && tty {
lastError = ctr.Cleanup()
}
}
return lastError
}
|
