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package main
import (
"fmt"
"os"
"strings"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/rootless"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
var (
execFlags = []cli.Flag{
cli.StringSliceFlag{
Name: "env, e",
Usage: "Set environment variables",
},
cli.BoolFlag{
Name: "privileged",
Usage: "Give the process extended Linux capabilities inside the container. The default is false",
},
cli.BoolFlag{
Name: "interactive, i",
Usage: "Not supported. All exec commands are interactive by default.",
},
cli.BoolFlag{
Name: "tty, t",
Usage: "Allocate a pseudo-TTY. The default is false",
},
cli.StringFlag{
Name: "user, u",
Usage: "Sets the username or UID used and optionally the groupname or GID for the specified command",
},
LatestFlag,
}
execDescription = `
podman exec
Run a command in a running container
`
execCommand = cli.Command{
Name: "exec",
Usage: "Run a process in a running container",
Description: execDescription,
Flags: sortFlags(execFlags),
Action: execCmd,
ArgsUsage: "CONTAINER-NAME",
SkipArgReorder: true,
UseShortOptionHandling: true,
OnUsageError: usageErrorHandler,
}
)
func execCmd(c *cli.Context) error {
args := c.Args()
var ctr *libpod.Container
var err error
argStart := 1
if len(args) < 1 && !c.Bool("latest") {
return errors.Errorf("you must provide one container name or id")
}
if len(args) < 2 && !c.Bool("latest") {
return errors.Errorf("you must provide a command to exec")
}
if c.Bool("latest") {
argStart = 0
}
rootless.SetSkipStorageSetup(true)
cmd := args[argStart:]
runtime, err := libpodruntime.GetRuntime(c)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
if c.Bool("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])
}
pid, err := ctr.PID()
if err != nil {
return err
}
became, ret, err := rootless.JoinNS(uint(pid))
if err != nil {
return err
}
if became {
os.Exit(ret)
}
// ENVIRONMENT VARIABLES
env := defaultEnvVariables
for _, e := range c.StringSlice("env") {
split := strings.SplitN(e, "=", 2)
if len(split) > 1 {
env[split[0]] = split[1]
} else {
env[split[0]] = ""
}
}
if err := readKVStrings(env, []string{}, c.StringSlice("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))
}
return ctr.Exec(c.Bool("tty"), c.Bool("privileged"), envs, cmd, c.String("user"))
}
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