-bool CheckAuth(pkgAcquire& Fetcher, bool const PromptUser);
-bool AcquireRun(pkgAcquire &Fetcher, int const PulseInterval, bool * const Failure, bool * const TransientNetworkFailure);
+#include <string>
+#include <vector>
+
+class pkgAcquire;
+
+APT_PUBLIC bool CheckDropPrivsMustBeDisabled(pkgAcquire &Fetcher);
+
+// Check if all files in the fetcher are authenticated
+APT_PUBLIC bool CheckAuth(pkgAcquire& Fetcher, bool const PromptUser);
+
+// show a authentication warning prompt and return true if the system
+// should continue
+APT_PUBLIC bool AuthPrompt(std::vector<std::string> const &UntrustedList, bool const PromptUser);
+
+APT_PUBLIC bool AcquireRun(pkgAcquire &Fetcher, int const PulseInterval, bool * const Failure, bool * const TransientNetworkFailure);
+
+APT_PUBLIC bool CheckFreeSpaceBeforeDownload(std::string const &Dir, unsigned long long FetchBytes);