Merge "Add more mounting options to updater mount function." am: ac1ae4fd2e am: 609b8b5360 (7ab5d7f2) · Commits · e / os / android_bootable_recovery

updater/updater_runtime.cpp

+58 −2

Original line number	Diff line number	Diff line
		@@ -43,10 +43,62 @@ std::string UpdaterRuntime::FindBlockDeviceName(const std::string_view name) con
		return std::string(name);
		}

		static struct {
		const char* name;
		unsigned flag;
		} mount_flags_list[] = {
		{ "noatime", MS_NOATIME },
		{ "noexec", MS_NOEXEC },
		{ "nosuid", MS_NOSUID },
		{ "nodev", MS_NODEV },
		{ "nodiratime", MS_NODIRATIME },
		{ "ro", MS_RDONLY },
		{ "rw", 0 },
		{ "remount", MS_REMOUNT },
		{ "bind", MS_BIND },
		{ "rec", MS_REC },
		{ "unbindable", MS_UNBINDABLE },
		{ "private", MS_PRIVATE },
		{ "slave", MS_SLAVE },
		{ "shared", MS_SHARED },
		{ "defaults", 0 },
		{ 0, 0 },
		};

		static bool setMountFlag(const std::string& flag, unsigned* mount_flags) {
		for (const auto& [name, value] : mount_flags_list) {
		if (flag == name) {
		*mount_flags \|= value;
		return true;
		}
		}
		return false;
		}

		static bool parseMountFlags(const std::string& flags, unsigned* mount_flags,
		std::string* fs_options) {
		bool is_flag_set = false;
		std::vector<std::string> flag_list;
		for (const auto& flag : android::base::Split(flags, ",")) {
		if (!setMountFlag(flag, mount_flags)) {
		// Unknown flag, so it must be a filesystem specific option.
		flag_list.push_back(flag);
		} else {
		is_flag_set = true;
		}
		}
		*fs_options = android::base::Join(flag_list, ',');
		return is_flag_set;
		}

		int UpdaterRuntime::Mount(const std::string_view location, const std::string_view mount_point,
		const std::string_view fs_type, const std::string_view mount_options) {
		std::string mount_point_string(mount_point);
		std::string mount_options_string(mount_options);
		char* secontext = nullptr;
		unsigned mount_flags = 0;
		std::string fs_options;

		if (sehandle_) {
		selabel_lookup(sehandle_, &secontext, mount_point_string.c_str(), 0755);
		setfscreatecon(secontext);
		@@ -59,9 +111,13 @@ int UpdaterRuntime::Mount(const std::string_view location, const std::string_vie
		setfscreatecon(nullptr);
		}

		if (!parseMountFlags(mount_options_string, &mount_flags, &fs_options)) {
		// Fall back to default
		mount_flags = MS_NOATIME \| MS_NODEV \| MS_NODIRATIME;
		}

		return mount(std::string(location).c_str(), mount_point_string.c_str(),
		std::string(fs_type).c_str(), MS_NOATIME \| MS_NODEV \| MS_NODIRATIME,
		std::string(mount_options).c_str());
		std::string(fs_type).c_str(), mount_flags, fs_options.c_str());
		}

		bool UpdaterRuntime::IsMounted(const std::string_view mount_point) const {