Add podman buildx version support

Fixes: https://github.com/containers/podman/issues/16793

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

cmd/podman/images/version.go

@@ -0,0 +1,35 @@
+package images
+
+import (
+	"fmt"
+
+	"github.com/containers/buildah/define"
+	"github.com/containers/common/pkg/completion"
+	"github.com/containers/podman/v4/cmd/podman/registry"
+	"github.com/containers/podman/v4/cmd/podman/validate"
+	"github.com/spf13/cobra"
+)
+
+var (
+	versionDescription = `Print build version`
+	versionCmd         = &cobra.Command{
+		Use:               "version",
+		Args:              validate.NoArgs,
+		Short:             "Print build version",
+		Long:              versionDescription,
+		RunE:              version,
+		ValidArgsFunction: completion.AutocompleteNone,
+	}
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Command: versionCmd,
+		Parent:  buildxCmd,
+	})
+}
+
+func version(cmd *cobra.Command, args []string) error {
+	fmt.Printf("%s %s\n", define.Package, define.Version)
+	return nil
+}

test/system/070-build.bats

@@ -43,6 +43,12 @@ VOLUME /a/b/c
 VOLUME ['/etc/foo', '/etc/bar']
 EOF
 
+    run_podman info --format '{{ .Host.BuildahVersion}}'
+    BUILDAH_VERSION=$output
+
+    run_podman buildx version
+    is "$output" "buildah ${BUILDAH_VERSION}" "buildx version contains Buildah version"
+
     run_podman buildx build --load -t build_test --format=docker $tmpdir
     is "$output" ".*COMMIT" "COMMIT seen in log"