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package main
import (
"fmt"
"io/ioutil"
"os"
"strconv"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/cmd/podman/shared/parse"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/rootless"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
var (
execCommand cliconfig.ExecValues
execDescription = `Execute the specified command inside a running container.
`
_execCommand = &cobra.Command{
Use: "exec [flags] CONTAINER [COMMAND [ARG...]]",
Short: "Run a process in a running container",
Long: execDescription,
RunE: func(cmd *cobra.Command, args []string) error {
execCommand.InputArgs = args
execCommand.GlobalFlags = MainGlobalOpts
return execCmd(&execCommand)
},
Example: `podman exec -it ctrID ls
podman exec -it -w /tmp myCtr pwd
podman exec --user root ctrID ls`,
}
)
func init() {
execCommand.Command = _execCommand
execCommand.SetHelpTemplate(HelpTemplate())
execCommand.SetUsageTemplate(UsageTemplate())
flags := execCommand.Flags()
flags.SetInterspersed(false)
flags.StringArrayVarP(&execCommand.Env, "env", "e", []string{}, "Set environment variables")
flags.BoolVarP(&execCommand.Interfactive, "interactive", "i", false, "Not supported. All exec commands are interactive by default")
flags.BoolVarP(&execCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of")
flags.BoolVar(&execCommand.Privileged, "privileged", false, "Give the process extended Linux capabilities inside the container. The default is false")
flags.BoolVarP(&execCommand.Tty, "tty", "t", false, "Allocate a pseudo-TTY. The default is false")
flags.StringVarP(&execCommand.User, "user", "u", "", "Sets the username or UID used and optionally the groupname or GID for the specified command")
flags.IntVar(&execCommand.PreserveFDs, "preserve-fds", 0, "Pass N additional file descriptors to the container")
flags.StringVarP(&execCommand.Workdir, "workdir", "w", "", "Working directory inside the container")
markFlagHiddenForRemoteClient("latest", flags)
}
func execCmd(c *cliconfig.ExecValues) error {
args := c.InputArgs
var ctr *libpod.Container
var err error
argStart := 1
if len(args) < 1 && !c.Latest {
return errors.Errorf("you must provide one container name or id")
}
if len(args) < 2 && !c.Latest {
return errors.Errorf("you must provide a command to exec")
}
if c.Latest {
argStart = 0
}
cmd := args[argStart:]
runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
if c.Latest {
ctr, err = runtime.GetLatestContainer()
} else {
ctr, err = runtime.LookupContainer(args[0])
}
if err != nil {
return errors.Wrapf(err, "unable to exec into %s", args[0])
}
if c.PreserveFDs > 0 {
entries, err := ioutil.ReadDir("/proc/self/fd")
if err != nil {
return errors.Wrapf(err, "unable to read /proc/self/fd")
}
m := make(map[int]bool)
for _, e := range entries {
i, err := strconv.Atoi(e.Name())
if err != nil {
if err != nil {
return errors.Wrapf(err, "cannot parse %s in /proc/self/fd", e.Name())
}
}
m[i] = true
}
for i := 3; i < 3+c.PreserveFDs; i++ {
if _, found := m[i]; !found {
return errors.New("invalid --preserve-fds=N specified. Not enough FDs available")
}
}
}
if os.Geteuid() != 0 {
var became bool
var ret int
data, err := ioutil.ReadFile(ctr.Config().ConmonPidFile)
if err == nil {
conmonPid, err := strconv.Atoi(string(data))
if err != nil {
return errors.Wrapf(err, "cannot parse PID %q", data)
}
became, ret, err = rootless.JoinDirectUserAndMountNS(uint(conmonPid))
} else {
pid, err := ctr.PID()
if err != nil {
return err
}
became, ret, err = rootless.JoinNS(uint(pid), c.PreserveFDs)
}
if err != nil {
return err
}
if became {
os.Exit(ret)
}
}
// ENVIRONMENT VARIABLES
env := map[string]string{}
if err := parse.ReadKVStrings(env, []string{}, c.Env); err != nil {
return errors.Wrapf(err, "unable to process environment variables")
}
envs := []string{}
for k, v := range env {
envs = append(envs, fmt.Sprintf("%s=%s", k, v))
}
streams := new(libpod.AttachStreams)
streams.OutputStream = os.Stdout
streams.ErrorStream = os.Stderr
streams.InputStream = os.Stdin
streams.AttachOutput = true
streams.AttachError = true
streams.AttachInput = true
return ctr.Exec(c.Tty, c.Privileged, envs, cmd, c.User, c.Workdir, streams, c.PreserveFDs)
}
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