Marc,
at the first glance it looks like getting installed packages can be
simplified a bit:
bundle agent packages
{
vars:
"pkg_list" string => execresult("/usr/bin/dpkg -l | /usr/bin/awk
'/^ii/ {print $2}'", "useshell");
"installed" string => splitstring("$(pkg_list)", "[\n]" , "10000");
...
The idea of crossing promises that way looks dubious, but if cfengine
handles that correctly - well, okay...
2010/5/7 Marc Baudoin <baud...@stg-interactive.com>:
> [ Replying to myself. ]
>
> Marc Baudoin <baud...@stg-interactive.com> écrit :
>>
>> I'm assessing Cfengine 3 (community edition) to manage a bunch of
>> servers. It seems to have all the required features but I can't
>> figure out how to manage packages (at least in the way I want).
>> I believe package management is quite new in Cfengine 3 so what I
>> need may not exist yet.
>>
>> I'd like to be able to list explicitely what packages has to be
>> installed on each server. This is easy:
>>
>> bundle agent packages
>> {
>> vars:
>> "match_package" slist => { "pkg1" , "pkg2" } ;
>>
>> packages:
>> "$(match_package)"
>> package_policy => "add" ,
>> package_method => generic ;
>> }
>>
>> But I also want other packages to be removed. Ideally, packages
>> installed as dependencies of those listed in $(match_package)
>> should be handled automatically so they don't have to be listed
>> explicitely but it depends heavily on which package manager is
>> used. So, supposing every required package (and their
>> dependencies) is listed in $(match_package), how can I have any
>> other one removed?
>>
>> Intuitively, I'd like to be able to add something like that to my
>> bundle:
>>
>> packages:
>> not "$(match_package)"
>> package_policy => "delete" ,
>> package_method => generic ;
>>
>> But I haven't found the right syntax to use (I may have missed
>> something in the documentation, as it's quite hard for a
>> newcomer).
>>
>> Is there a way to do that?
>
> After spending some time reading the documentation and testing
> different aspects of Cfengine, I came up with the following
> bundle, which seems to do what I want, which is make sure no
> other package than those listed in $(packages) are installed:
>
> bundle agent software
> {
> vars:
>
> "packages" slist => { "pkg1" , "pkg2" } ;
>
> "installed"
> slist =>
> {
> readstringlist ( "/tmp/installed" ,
> "#.*" , "[\n]" , "10000" , "100000" )
> } ;
>
> packages:
>
> "$(packages)"
> package_method => generic ,
> package_policy => "add" ;
>
> "$(installed)"
> package_method => generic ,
> package_policy => "delete" ;
>
> commands:
>
> "/usr/bin/dpkg -l | /usr/bin/awk '/^ii/ {print $2}' > /tmp/installed"
> contain => in_shell ;
>
> files:
> "/tmp/installed"
> edit_line => delete_lines_matching ( "$(packages)" ) ;
> }
>
> Can somebody more experienced in the ways of Cfengine tell me if
> this is correct? Is it optimal or are there things to improve?
>
> --
> Marc Baudoin
> STG Interactive
> _______________________________________________
> Help-cfengine mailing list
> Help-cfengine@cfengine.org
> https://cfengine.org/mailman/listinfo/help-cfengine
>
--
SY, Seva Gluschenko.
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