[chef] Re: Template value from script output

[Daniel DeLeo < >]

On Friday, June 24, 2011 at 10:50 AM, Matthew Drobnak wrote:

> If I have a template file, that I need to get a value only when it’s 
> changed, how do I set that up in the recipe?
> 
> For example:
> 
> script “get_appserverval”
>  interpreter “bash”
>  cwd “/tmp”
>  code <<-EOH
> SERVERURL=$1
> SERVERPORT=$2
> USERNAME=$3
> PASSWORD=$4
> 
> URL=`wget --user-agent="Mozilla/5.0 (Windows NT 6.1; U; en; rv:1.9.1.6) 
> Gecko/20091201 Firefox/3.5.6" --keep-session-cookies 
> --save-cookies=mycookie ${SERVERURL}:${SERVERPORT} -O - |grep 
> "action/Login" | awk -Faction= '{print $2}' |awk '{print $1}' |sed 
> "s/:80/:${SERVERPORT}/g"`
> 
> BASEURL=`wget --user-agent="Mozilla/5.0 (Windows NT 6.1; U; en; rv:1.9.1.6) 
> Gecko/20091201 Firefox/3.5.6" --keep-session-cookies 
> --load-cookies=mycookie --save-cookies=mycookie2 ${URL} 
> --post-data=UserName=${USERNAME}\&Password=${PASSWORD}\&F_LOCALE=en_us\&submitButton=\&page=submit
>  -O - | grep "var gBaseActionURL" | sed 's/\r//g' | sed 
> "s/:80/:${SERVERPORT}/g" | awk -F= '{print $2}' |sed 's/ //g' | sed 
> 's/\"//g' | sed 's/;//g'`
> 
> APPSERVERVAL=`wget --user-agent="Mozilla/5.0 (Windows NT 6.1; U; en; 
> rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6" --keep-session-cookies 
> --load-cookies=mycookie2 --save-cookies=mycookie3 
> ${BASEURL}Report.Open?F_REPORTID=11 -O - | grep APPSERVERVALUE |awk 
> -FVALUE= '{print $2}' |sed 's/>//g' | sed 's/\"//g'`
> 
> echo $APPSERVERVAL
> EOH
> end
> 
> So I have a few problems:
> 
> Need to pass some values to the script.
You can "interpolate" values into a heredoc in ruby via the normal syntax:

mystring=<<-EOH
this is a variable: #{my_variable}
EOH

> Need to get a value from the script, to pass to a template resource.
This is contrary to Chef's design and philosophy. You should be declaring 
what the state of the system should be from the top down (like a boss, if you 
will ;). You should see if you can design your system not to require this. 
Could you summarize why you need this?

> How do I run this script only if the affected template changes, or it’s a 
> new deploy?

template "path/to/file" do
# other stuff
notifies(:run, "script[get_appserverval")
end

> 
> This is a Java WebApp. I’m using application to deploy the war file. I 
> modified the tomcat cookbook to take a parameter for Path to tell the 
> deployment path, and the app[id] is set as the Context name.
> I also modified the application cookbook to allow me to override the db 
> setup parameters, but I would like to know if there’s a better way to do 
> it… I’ll post a diff shortly.
> 
> So right now I have a role, which has a run list of application, and 
> appname. This code would be called in the appname recipe, which copies over 
> the supporting template files and restarts tomcat when done (each file has 
> a restart tomcat notification, which works fine). Should I use the apps 
> data bag, or use a different one?
> 
> Thanks.
> 
> -Matt


-- 
Dan DeLeo