Carlos, lastexitcode does not give you the exit status of the last
powershell cmdlet, it gives you the last exit status of a Windows process
that you executed. Since get-website is a cmdlet, lastexitcode tells you
nothing about its success or failure. For cmdlet status, use ?, which is
$true if the last cmdlet succeeded, $false otherwise.
Powershell_script actually has a feature to make your scenario easy – just
provide a boolean expression to your guard, something like (get-website |
where-object { $_.name -eq ‘My_Web_App’ }).length > 0, which will return
$true if there’s a web site satisfying the query (assuming get-website
returns a collection with a length property) and $false otherwise.
You can read more about this capability in this documentation from
http://docs.getchef.com/resource_powershell_script.html – see the excerpt
below:
convert_boolean_return
Use to return 0 if the last line of a command is evaluated to be true or to
return 1 if the last line is evaluated to be false. Default value: false.
When the guard_intrepreter common attribute is set to :powershell_script, a
string command will be evaluated as if this value were set to true. This is
because the behavior of this attribute is similar to the value of the "$?"
expression common in UNIX interpreters. For example, this:
powershell_script ‘make_safe_backup’ do
guard_interpreter :powershell_script
code ‘cp ~/data/nodes.json ~/data/nodes.bak’
not_if ‘test-path ~/data/nodes.bak’
end
is similar to:
bash ‘make_safe_backup’ do
code ‘cp ~/data/nodes.json ~/data/nodes.bak’
not_if ‘test -e ~/data/nodes.bak’
end
From: Seth Vargo [mailto:sethvargo@getchef.com]
Sent: Wednesday, August 20, 2014 7:55 AM
To: chef@lists.opscode.com
Subject: [chef] Re: Re: NOT_IF and ONLY_IF validation problem.
Hi Carlos,
You also posted this question on StackOverflow:
.
I understand that you are trying to get the fastest answer possible, but
posting the same question in multiple channels, you may discourage the
chances of getting an answer. It gives a wry impression. Here’s what I
would recommend:
-
If you have a question and you need an answer NOW, IRC is the best bet.
You will get real-time communication with members of Chef and the Chef
community.
-
If you have a question that is about process, best practice, or opinion,
this mailing list is probably your best bet. If you need to show code on
the mailing list, using a service like PasteBin or GitHub Gist can make the
email more readable.
-
If you have a specific code example (i.e. why is this failing),
StackOverflow/ServerFault are usually the best.
I realize there are definitely areas for overlap, so please use your best
judgement.
Thanks,
Seth
On Aug 20, 2014, at 10:40 AM, Julian C. Dunn jdunn@aquezada.com wrote:
On Wed, Aug 20, 2014 at 8:16 AM, Carlos Camacho
carlos.camacho@frontiersin.org wrote:
Hello!
Im runing this simple recipe block to create a web app in IIS
powershell_script “create_site_my_site” do
code "New-webapppool -name ‘My_Web_App’; New-Website -Name
’My_Web_App’ -applicationpool ‘My_Web_App’ -Port ‘80’ -IPAddress *
-PhysicalPath ‘c:\webs\My_Web_App’ "
action :run
not_if "get-website | where-object { $_.name -eq ‘My_Web_App’ }"
end
The problem here its that the NOT_IF part its allways True
PS C:\Users\carlos>
PS C:\Users\carlos> get-website | where-object { $.name -eq ‘asdfasdfasdf’
}
PS C:\Users\carlos> echo lastexitcode
1
PS C:\Users\carlos> get-website | where-object { .name -eq ‘My_Web_App’ }
Name ID State Physical Path
Bindings
--------
My_Web_App 6 Stopped c:\webs\My_Web_App http *:80:
https *:443:
PS C:\Users\carlos.camacho> echo $lastexitcode
1
Now, my question is about how to return True or False in the NOT_IF
depending on my code return value ??
Use the convert_boolean_return attribute in the powershell_script
resource to do the right thing. See the documentation for information
about what that does & why.
http://docs.getchef.com/resource_powershell_script.html
I imagine that this will become the default when :guard_interpreter
becomes :powershell by default for powershell_script.
–
[ Julian C. Dunn jdunn@aquezada.com * Sorry, I’m ]
[ WWW: http://www.aquezada.com/staff/julian * only Web 1.0 ]
[ gopher://sdf.org/1/users/keymaker/ * compliant! ]
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