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package main
import (
"fmt"
"io"
"os"
"strings"
"github.com/containers/image/types"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/cmd/podman/shared"
"github.com/containers/libpod/libpod/image"
"github.com/containers/libpod/pkg/util"
"github.com/containers/libpod/utils"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var (
runlabelFlags = []cli.Flag{
cli.StringFlag{
Name: "authfile",
Usage: "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json",
},
cli.BoolFlag{
Name: "display",
Usage: "preview the command that the label would run",
},
cli.StringFlag{
Name: "cert-dir",
Usage: "`pathname` of a directory containing TLS certificates and keys",
},
cli.StringFlag{
Name: "creds",
Usage: "`credentials` (USERNAME:PASSWORD) to use for authenticating to a registry",
},
cli.StringFlag{
Name: "name",
Usage: "Assign a name to the container",
},
cli.StringFlag{
Name: "opt1",
Usage: "Optional parameter to pass for install",
Hidden: true,
},
cli.StringFlag{
Name: "opt2",
Usage: "Optional parameter to pass for install",
Hidden: true,
},
cli.StringFlag{
Name: "opt3",
Usage: "Optional parameter to pass for install",
Hidden: true,
},
cli.BoolFlag{
Name: "quiet, q",
Usage: "Suppress output information when installing images",
},
cli.BoolFlag{
Name: "pull, p",
Usage: "pull the image if it does not exist locally prior to executing the label contents",
},
cli.StringFlag{
Name: "signature-policy",
Usage: "`pathname` of signature policy file (not usually used)",
},
cli.BoolTFlag{
Name: "tls-verify",
Usage: "require HTTPS and verify certificates when contacting registries (default: true)",
},
}
runlabelDescription = `
Executes a command as described by a container image label.
`
runlabelCommand = cli.Command{
Name: "runlabel",
Usage: "Execute the command described by an image label",
Description: runlabelDescription,
Flags: runlabelFlags,
Action: runlabelCmd,
ArgsUsage: "",
SkipArgReorder: true,
OnUsageError: usageErrorHandler,
}
)
// installCmd gets the data from the command line and calls installImage
// to copy an image from a registry to a local machine
func runlabelCmd(c *cli.Context) error {
var (
imageName string
stdErr, stdOut io.Writer
stdIn io.Reader
newImage *image.Image
)
// Evil images could trick into recursively executing the runlabel
// command. Avoid this by setting the "PODMAN_RUNLABEL_NESTED" env
// variable when executing a label first.
nested := os.Getenv("PODMAN_RUNLABEL_NESTED")
if nested == "1" {
return fmt.Errorf("nested runlabel calls: runlabels cannot execute the runlabel command")
}
opts := make(map[string]string)
runtime, err := libpodruntime.GetRuntime(c)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
args := c.Args()
if len(args) < 2 {
logrus.Errorf("the runlabel command requires at least 2 arguments: LABEL IMAGE")
return nil
}
if err := validateFlags(c, runlabelFlags); err != nil {
return err
}
if c.Bool("display") && c.Bool("quiet") {
return errors.Errorf("the display and quiet flags cannot be used together.")
}
pull := c.Bool("pull")
label := args[0]
runlabelImage := args[1]
if c.IsSet("opt1") {
opts["opt1"] = c.String("opt1")
}
if c.IsSet("opt2") {
opts["opt2"] = c.String("opt2")
}
if c.IsSet("opt3") {
opts["opt3"] = c.String("opt3")
}
ctx := getContext()
stdErr = os.Stderr
stdOut = os.Stdout
stdIn = os.Stdin
if c.Bool("quiet") {
stdErr = nil
stdOut = nil
stdIn = nil
}
if pull {
var registryCreds *types.DockerAuthConfig
if c.IsSet("creds") {
creds, err := util.ParseRegistryCreds(c.String("creds"))
if err != nil {
return err
}
registryCreds = creds
}
dockerRegistryOptions := image.DockerRegistryOptions{
DockerRegistryCreds: registryCreds,
DockerCertPath: c.String("cert-dir"),
DockerInsecureSkipTLSVerify: !c.BoolT("tls-verify"),
}
newImage, err = runtime.ImageRuntime().New(ctx, runlabelImage, c.String("signature-policy"), c.String("authfile"), stdOut, &dockerRegistryOptions, image.SigningOptions{}, false, false)
} else {
newImage, err = runtime.ImageRuntime().NewFromLocal(runlabelImage)
}
if err != nil {
return errors.Wrapf(err, "unable to find image")
}
if len(newImage.Names()) < 1 {
imageName = newImage.ID()
} else {
imageName = newImage.Names()[0]
}
runLabel, err := newImage.GetLabel(ctx, label)
if err != nil {
return err
}
// If no label to execute, we return
if runLabel == "" {
return nil
}
// The user provided extra arguments that need to be tacked onto the label's command
if len(args) > 2 {
runLabel = fmt.Sprintf("%s %s", runLabel, strings.Join(args[2:], " "))
}
cmd := shared.GenerateCommand(runLabel, imageName, c.String("name"))
env := shared.GenerateRunEnvironment(c.String("name"), imageName, opts)
env = append(env, "PODMAN_RUNLABEL_NESTED=1")
envmap := envSliceToMap(env)
envmapper := func(k string) string {
switch k {
case "OPT1":
return envmap["OPT1"]
case "OPT2":
return envmap["OPT2"]
case "OPT3":
return envmap["OPT3"]
}
return ""
}
newS := os.Expand(strings.Join(cmd, " "), envmapper)
cmd = strings.Split(newS, " ")
if !c.Bool("quiet") {
fmt.Printf("Command: %s\n", strings.Join(cmd, " "))
if c.Bool("display") {
return nil
}
}
return utils.ExecCmdWithStdStreams(stdIn, stdOut, stdErr, env, cmd[0], cmd[1:]...)
}
func envSliceToMap(env []string) map[string]string {
m := make(map[string]string)
for _, i := range env {
split := strings.Split(i, "=")
m[split[0]] = strings.Join(split[1:], " ")
}
return m
}
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