HOW IT WORKSWhen a developer attempts to connect to a repository via ssh, the SSHdaemon searches for a match for that user's key in~hg/.ssh/authorized_keys. If the developer is authorised to connect to therepository they will have an entry in this file. The entry includes a"command" prefix which specifies that the restricted shell"/usr/local/share/mercurial-server/hg-ssh" should be used; this shell ispassed an argument identifying the developer. The shell parses the commandthe developer is trying to execute, and consults a rules file to see ifthat developer is allowed to perform that action on that repository.The file ~hg/.ssh/authorized_keys is generated by "refresh-auth", whichrecurses through two directories of files containing SSH keys and generatesan entry in authorized_keys for each one, using the name of the key file asthe identifier for the developer. These keys will live in the "keys"subdirectory "/etc/mercurial-server" and the "keys" subdirectory of arepository called "hgadmin". A hook in this repository re-runs"refresh-auth" on the most recent version after every push.Finally, hook in an extension is run for each changeset that is remotelycommitted, which uses the rules file to determine whether to allow thechangeset.