The Mercurial Update action updates the Pull, which update the repository metadata but not the files in the working directory.
Update is also useful for reverting the working directory to a previous revision.
Revision
The revision to update to. It none is specified, the working directory is updated to the head of the current branch.
Date
Update to the tipmost revision matching the date. See for more information.
Clean
Discard any uncommitted changes.
Check
Check for uncommitted changes.