Only allow Rootless runs of Podman Machine

Podman Machine crashes if run as root. When creating the machine, we write the ignition so that the UID of the core user matches the UID of the user on the host. We by default, create the root user on the machine with UID 0. If the user on the host is root, the core UID and the Root UID collide, causing a the VM not to boot.

[NO NEW TESTS NEEDED]

Signed-off-by: Ashley Cui <acui@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/cmd/podman/machine/machine.go b/cmd/podman/machine/machine.go
index 5a8a06b9d..d3d44b45e 100644
--- a/cmd/podman/machine/machine.go
+++ b/cmd/podman/machine/machine.go
@@ -5,6 +5,7 @@ package machine
 
 import (
 	"errors"
+	"fmt"
 	"net"
 	"os"
 	"path/filepath"
@@ -17,6 +18,7 @@ import (
 	"github.com/containers/podman/v4/cmd/podman/validate"
 	"github.com/containers/podman/v4/libpod/events"
 	"github.com/containers/podman/v4/pkg/machine"
+	"github.com/containers/podman/v4/pkg/rootless"
 	"github.com/containers/podman/v4/pkg/util"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -162,3 +164,10 @@ func closeMachineEvents(cmd *cobra.Command, _ []string) error {
 	}
 	return nil
 }
+
+func rootlessOnly(cmd *cobra.Command, args []string) error {
+	if !rootless.IsRootless() {
+		return fmt.Errorf("cannot run command %q as root", cmd.CommandPath())
+	}
+	return nil
+}