Implement pre and post-update command execution.

container/command_info.go

@@ -0,0 +1,27 @@
+package container
+
+import (
+        "encoding/json"
+)
+
+type CommandInfo struct {
+	User         string
+        Privileged   bool
+        Env          []string
+        Cmd          []string
+}
+
+func ReadCommandInfoFromJSON(commandInfoJSON string) (CommandInfo, error) {
+        commandInfo := CommandInfo{}
+
+        err := json.Unmarshal([]byte(commandInfoJSON), &commandInfo)
+        if err != nil {
+		return CommandInfo{}, err
+	}
+
+        return commandInfo, nil
+}
+
+func (commandInfo CommandInfo) IsDefined() bool {
+        return commandInfo.Cmd != nil && len(commandInfo.Cmd) > 0
+}