Lay the foundations for logging Podman in Go

https://github.com/containers/toolbox/pull/318

src/meson.build

@@ -4,6 +4,7 @@ go_build_wrapper_program = find_program('go-build-wrapper')
 sources = files(
   'toolbox.go',
   'cmd/root.go',
+  'pkg/podman/podman.go',
   'pkg/shell/shell.go',
   'pkg/utils/utils.go',
   'pkg/version/version.go',

src/pkg/podman/podman.go

@@ -0,0 +1,29 @@
+/*
+ * Copyright © 2019 – 2020 Red Hat Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package podman
+
+import (
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	LogLevel = logrus.ErrorLevel
+)
+
+func SetLogLevel(logLevel logrus.Level) {
+	LogLevel = logLevel
+}