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// +build linux
package main
import (
"fmt"
"os"
"os/exec"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/rootless"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
var (
unshareDescription = "Runs a command in a modified user namespace."
_unshareCommand = &cobra.Command{
Use: "unshare [flags] [COMMAND [ARG]]",
Short: "Run a command in a modified user namespace",
Long: unshareDescription,
RunE: func(cmd *cobra.Command, args []string) error {
unshareCommand.InputArgs = args
unshareCommand.GlobalFlags = MainGlobalOpts
return unshareCmd(&unshareCommand)
},
Example: `podman unshare id
podman unshare cat /proc/self/uid_map,
podman unshare podman-script.sh`,
}
unshareCommand cliconfig.PodmanCommand
)
func init() {
unshareCommand.Command = _unshareCommand
unshareCommand.SetHelpTemplate(HelpTemplate())
unshareCommand.SetUsageTemplate(UsageTemplate())
flags := _unshareCommand.Flags()
flags.SetInterspersed(false)
}
func unshareEnv(config *libpod.RuntimeConfig) []string {
return append(os.Environ(), "_CONTAINERS_USERNS_CONFIGURED=done",
fmt.Sprintf("CONTAINERS_GRAPHROOT=%s", config.StorageConfig.GraphRoot),
fmt.Sprintf("CONTAINERS_RUNROOT=%s", config.StorageConfig.RunRoot))
}
// unshareCmd execs whatever using the ID mappings that we want to use for ourselves
func unshareCmd(c *cliconfig.PodmanCommand) error {
if isRootless := rootless.IsRootless(); !isRootless {
return errors.Errorf("please use unshare with rootless")
}
// exec the specified command, if there is one
if len(c.InputArgs) < 1 {
// try to exec the shell, if one's set
shell, shellSet := os.LookupEnv("SHELL")
if !shellSet {
return errors.Errorf("no command specified and no $SHELL specified")
}
c.InputArgs = []string{shell}
}
runtime, err := libpodruntime.GetRuntime(getContext(), c)
if err != nil {
return err
}
runtimeConfig, err := runtime.GetConfig()
if err != nil {
return err
}
cmd := exec.Command(c.InputArgs[0], c.InputArgs[1:]...)
cmd.Env = unshareEnv(runtimeConfig)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
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