main: exit if no Cgroups v2

Signed-off-by: Lokesh Mandvekar <[email protected]>

Author: lsm5

cmd/buildah/main.go

@@ -18,6 +18,7 @@ import (
 	rspecs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	cgroupv2 "go.podman.io/common/pkg/cgroupv2"
 	"go.podman.io/common/pkg/config"
 	"go.podman.io/storage"
 	"go.podman.io/storage/pkg/unshare"
@@ -231,6 +232,15 @@ func main() {
 		return
 	}
 
+	cgroupsv2, err := cgroupv2.Enabled()
+	if err != nil {
+		logrus.Error(err, "Error reading cgroups mode")
+	}
+	if !cgroupsv2 {
+		fmt.Println("Could not detect Cgroups v2 on your system. Please switch to Cgroups v2.")
+		os.Exit(1)
+	}
+
 	// Hard code TMPDIR functions to use $TMPDIR or /var/tmp
 	os.Setenv("TMPDIR", parse.GetTempDir())
 

info.go

@@ -14,7 +14,6 @@ import (
 	"github.com/containers/buildah/util"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/sirupsen/logrus"
-	"go.podman.io/common/pkg/cgroups"
 	"go.podman.io/storage"
 	"go.podman.io/storage/pkg/system"
 	"go.podman.io/storage/pkg/unshare"
@@ -51,10 +50,6 @@ func hostInfo() map[string]any {
 	info["cpus"] = runtime.NumCPU()
 	info["rootless"] = unshare.IsRootless()
 
-	_, err := cgroups.IsCgroup2UnifiedMode()
-	if err != nil {
-		logrus.Error(err, "err reading cgroups mode")
-	}
 	ociruntime := util.Runtime()
 	info["CgroupVersion"] = "v2"
 	info["OCIRuntime"] = ociruntime

vendor/go.podman.io/common/pkg/cgroupv2/cgroups_linux.go

@@ -489,6 +489,7 @@ go.podman.io/common/pkg/apparmor/internal/supported
 go.podman.io/common/pkg/auth
 go.podman.io/common/pkg/capabilities
 go.podman.io/common/pkg/cgroups
+go.podman.io/common/pkg/cgroupv2
 go.podman.io/common/pkg/chown
 go.podman.io/common/pkg/completion
 go.podman.io/common/pkg/config