Thomas Bellman wrote:
> Allan Marcus wrote:
>
>> This has probably been discussed, but I would like an exec to only be
>> executed if a facter variable is true. Seems there are two ways of
>> doing this, but I can only get the "if" way to work.
>>
>> # $lanl_sav_defdate is a custom fact
>> # make sure the live update file is correct, then force a liveupdate
>> class forceLiveupdate {
>> if $lanl_sav_defdate == 'February13,2008'{
>> # execute the live update command
>> exec {"liveupdate-now":
>> command => "[long command omited]",
>> }
>> }
>> }
>
> That is the easiest way.
>
>> Is this the "right" way of using a conditional, or should I use an
>> onlyif? Something like this, which doesn't seem to work for me:
>>
>> class forceLiveupdate {
>> # execute the live update command
>> exec {"liveupdate-now":
>> command => "[long command omited]",
>> onlyif => "match $lanl_sav_defdate == 'February13,2008'",
>> }
>> }
>
> The 'onlyif' and 'unless' parameters are shell commands, whose exit status
> determines if the shell command in the 'command' parameter will be run.
> Neither my CentOS, Fedora, Gentoo nor Solaris machines have a command named
> 'match', so that would return non-zero, and your command will not be run.
>
> A working version would rather use
>
> onlyif => "[ '$lanl_sav_defdate' = 'February13,2008' ]"
>
> However, there are several problems with this. First of all, you will have
> worse performance, since it will involve a fork() and exec(), which aren't
> the cheapest things one can do. Second, you have quoting problems; if your
> lanl_sav_defdate happens to contain a single quote, you will have problems.
> (In the upcoming 0.25 there is a function 'shellquote()' which can help you
> with that.)
>
> On the other hand, if you have requires or subscribes elsewhere that points
> to Exec[liveupdate-now], then those won't work if you wrap the exec in an
> if statement.
There is an easy workaround for the last problem: define an exec with
/bin/true in the else-branch:
| exec { "liveupdate-now":
| command => "/bin/true # fake",
| }
This allows one to ignore wether or not the exec is "active".
Regards, DavidS
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