A caretaker government is a government during the period between when parliament is dissolved by a Governor General who calls an election, throughout the campaign period and continues until a new government is appointed after the election.
The authority of this care taker government is typically limited. Canada currently has a caretaker government in place at the federal level because telhe country is in the middle of an election.
The National Post has a article on an unusual move by the Clerk of the Privy Council, the most senior public servant in the federal public service, to release the rules that guide a caretaker government. The prime minister and other ministers of thr crown (cabinet ministers) must follow these rules.
You can find the “rulebook” here: http://www.pco-bcp.gc.ca/index.asp?lang=eng&page=convention&doc=convention-eng.htm
The rulebook also explains the caretaker convention or practice in detail as well as the impacts on public servants-the non-partisan, permanent staff which administer the day to day business of the federal government