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cfengine classes and shellcommands

06 Oct 2005

cfengine is great, it really is. But there are some things that tripped me up. Often you want to set up a daemon to run The Right Way, which involves changing its config file. After that, of course, you want to restart it. What to do? The naive way (ie, the first way I tried) of doing things is:

control::
        sequence ( editfiles shellcommands )

editfiles::
        debian:
                { /etc/foo.conf
                        BeginGroupIfNoLineMatching "bar"
                                AddLine "bar"
                                Define restart_foo
                        EndGroup
                }

        freebsd:

                { /usr/local/etc/foo.conf
                        BeginGroupIfNoLineMatching "bar"
                                AddLine "bar"
                                Define restart_foo
                        EndGroup
                }

shellcommands::
        debian.restart_foo:
                "/etc/init.d/foo restart"

        freebsd.restart_foo:
                "/usr/local/etc/rc.d/foo restart"

However, the correct way of doing this is:

control::
        sequence = ( editfiles shellcommands )
        AddInstallable = ( restart_foo )

editfiles::
        debian:
                { /etc/foo.conf
                        BeginGroupIfNoLineMatching "bar"
                                AddLine "bar"
                                DefineInGroup "restart_foo"
                        EndGroup
                }

        freebsd:
                { /usr/local/etc/foo.conf
                        BeginGroupIfNoLineMatching "bar"
                                AddLine "bar"
                                DefineInGroup "restart_foo"
                        EndGroup
                }

shellcommands::
        debian.restart_foo:
                "/etc/init.d/foo restart"

        freebsd.restart_foo:
                "/usr/local/etc/rc.d/foo restart"

Without both the enumeration of all your made-up classes in AddInstallable and the enclosing of that class in quotes, cfengine will fail to do what you want -- and will do so quietly and with no clue about why. God, that took me a long time to find.

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