1 files changed, 50 insertions, 0 deletions
diff --git a/cmd/podman/system/unshare.go b/cmd/podman/system/unshare.go
new file mode 100644
index 000000000..7db5d36d2
--- /dev/null
+++ b/cmd/podman/system/unshare.go
@@ -0,0 +1,50 @@
+package system
+
+import (
+	"os"
+
+	"github.com/containers/libpod/cmd/podman/registry"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"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:  unshare,
+		Example: `podman unshare id
+  podman unshare cat /proc/self/uid_map,
+  podman unshare podman-script.sh`,
+	}
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode},
+		Command: unshareCommand,
+	})
+	flags := unshareCommand.Flags()
+	flags.SetInterspersed(false)
+}
+
+func unshare(cmd *cobra.Command, args []string) error {
+	if isRootless := rootless.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}
+	}
+
+	return registry.ContainerEngine().Unshare(registry.Context(), args)
+}