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// +build linux
package main
import (
"os"
"os/exec"
"github.com/containers/buildah/pkg/unshare"
"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: unshareCmd,
Example: `podman unshare id
podman unshare cat /proc/self/uid_map,
podman unshare podman-script.sh`,
}
)
func init() {
_unshareCommand.SetUsageTemplate(UsageTemplate())
flags := _unshareCommand.Flags()
flags.SetInterspersed(false)
}
// unshareCmd execs whatever using the ID mappings that we want to use for ourselves
func unshareCmd(c *cobra.Command, args []string) error {
if isRootless := unshare.IsRootless(); !isRootless {
return errors.Errorf("please use unshare with rootless")
}
// exec the specified command, if there is one
if len(args) < 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")
}
args = []string{shell}
}
cmd := exec.Command(args[0], args[1:]...)
cmd.Env = unshare.RootlessEnv()
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
unshare.ExecRunnable(cmd)
return nil
}
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