Chef solo setting default values


#1

Hi,

Can someone help me to understand this strange behaviour? As you can see bellow, value of node[:test_value2][“name”] magically disappears after I reference it for the first time. It should print:
[2012-08-29T09:25:43+02:00] INFO: [jan] value, value.
But it prints:
[2012-08-29T09:25:43+02:00] INFO: [jan] value, .

If this is known limitation of Chef, how can I reuse configuration data without retyping them?

Thanks, Jan

attributes/default.rb

default[:test1] = "test"
default[:test_value1] = default[:test1]

default[:test2] = {“name” => “value”}
default[:test_value2] = default[:test2]

recipes/default.rb

Chef::Log.info("[jan] #{node[:test_value1]}, #{node[:test_value1]}.")
Chef::Log.info("[jan] #{node[:test_value2][“name”]}, #{node[:test_value2][“name”]}.")

Output

[2012-08-29T09:25:42+02:00] INFO: *** Chef 10.12.0 ***
[2012-08-29T09:25:43+02:00] INFO: Setting the run_list to [“recipe[soa::default]
”] from JSON
[2012-08-29T09:25:43+02:00] INFO: Run List is [recipe[soa::default]]
[2012-08-29T09:25:43+02:00] INFO: Run List expands to [soa::default]
[2012-08-29T09:25:43+02:00] INFO: Starting Chef Run for prgsoa001
[2012-08-29T09:25:43+02:00] INFO: Running start handlers
[2012-08-29T09:25:43+02:00] INFO: Start handlers complete.
[2012-08-29T09:25:43+02:00] INFO: [jan] test, test.
[2012-08-29T09:25:43+02:00] INFO: [jan] value, .
[2012-08-29T09:25:43+02:00] INFO: Chef Run complete in 0.010143 seconds
[2012-08-29T09:25:43+02:00] INFO: Running report handlers
[2012-08-29T09:25:43+02:00] INFO: Report handlers complete

As you can see, the

Jan Bareš
Calypso Lead Developer

In association with
WOOD & Company Financial Services, a.s.
Palladium, Náměstí Republiky 1079/1a
110 00 Prague, Czech Republic
Tel. +420 222 096 111
Direct +420 222 096 378
Fax. +420 222 096 222

DISCLAIMER
WOOD & Company Financial Services, a.s. and its branches are authorized and regulated by the CNB as Home State regulator and in Poland by the KNF, in Romania by the CNVM, in Slovakia by the NBS and in the UK by the FSA as Host State regulators. For further information about WOOD & Co., its investment services, financial instruments and associated risks, safeguard client assets (incl. compensation schemes) and contractual relationship please see our website at www.wood.cz under section Corporate Governance.

Unless otherwise stated, this transmission is neither an offer nor the solicitation of an offer to sell or purchase any investment. All estimates, opinions and other information contained herein are subject to change without notice and are provided in good faith but without legal responsibility or liability. Opinion may be personal to the author and may not reflect the opinions of WOOD & Co. Communications from sales persons, sales traders or traders should not be regarded as investment research and may contain opinions or trading ideas which are different from WOOD & Co. investment research opinions.

This e-mail and any attachments are confidential and may be privileged or otherwise protected from disclosure. If you are not a named addressee you must not use, disclose, distribute, copy, print or rely on this e-mail and any of its attachments. Please notify the sender that you have received this email by mistake by replying to the email, and then delete the email and any copies of it. Although WOOD & Co. routinely screens e-mails for viruses, addressees should scan this e-mail and any attachments for viruses. WOOD & Co. makes no representation or warranty as to the absence of viruses in this e-mail or any attachments. Please note that to ensure regulatory compliance and for the protection of our clients and business, we may monitor and read e-mails sent to and from our server(s).


#2

Hi Jan,

This is indeed an interesting question.

I’ve simulated this in shef, and here’s the output: http://pastebin.com/SYaGZptX

A few things come to mind.

test2 is an attribute, not a Hash, so accessing it is slightly
different than a hash, as in there is logic inside for things like
@has_been_read, @current_nesting_level.

These probably have to do with “deep merging” of attributes and such,
and calling node[:test2_value2][‘name’] seems to create another
attribute, and step into that attribute.

Setting an attribute to a variable, instead of into another attribute
structure, may achieve what you’re after. Maybe something like this:

chef:attributes > node[:test3] = {“foo” => “bar”}
=> {“foo”=>“bar”}
chef:attributes > node[:test3].class
=> Chef::Node::Attribute
chef:attributes > my_test_attribute = node[:test3]
=> #<Chef::Node::Attribute @current_automatic=nil, @default={…},
@set_unless_value_present=false, @current_override=nil,
@auto_vivifiy_on_read=false, @automatic={…}, @override={…},
@current_default=nil, @has_been_read=false,
@current_nesting_level=[:test3], @normal={…},
@current_normal={“foo”=>“bar”}, @set_type=nil>
chef:attributes > my_test_attribute.class
=> Chef::Node::Attribute
chef:attributes > my_test_attribute[‘foo’]
=> "bar"
chef:attributes > my_test_attribute[‘foo’]
=> “bar”

Hope this helps,
-Mike

On Wed, Aug 29, 2012 at 3:31 AM, Jan Bares jan.bares@wood.cz wrote:

Hi,

Can someone help me to understand this strange behaviour? As you can see bellow, value of node[:test_value2][“name”] magically disappears after I reference it for the first time. It should print:
[2012-08-29T09:25:43+02:00] INFO: [jan] value, value.
But it prints:
[2012-08-29T09:25:43+02:00] INFO: [jan] value, .

If this is known limitation of Chef, how can I reuse configuration data without retyping them?

Thanks, Jan

attributes/default.rb

default[:test1] = "test"
default[:test_value1] = default[:test1]

default[:test2] = {“name” => “value”}
default[:test_value2] = default[:test2]

recipes/default.rb

Chef::Log.info("[jan] #{node[:test_value1]}, #{node[:test_value1]}.")
Chef::Log.info("[jan] #{node[:test_value2][“name”]}, #{node[:test_value2][“name”]}.")

Output

[2012-08-29T09:25:42+02:00] INFO: *** Chef 10.12.0 ***
[2012-08-29T09:25:43+02:00] INFO: Setting the run_list to [“recipe[soa::default]
”] from JSON
[2012-08-29T09:25:43+02:00] INFO: Run List is [recipe[soa::default]]
[2012-08-29T09:25:43+02:00] INFO: Run List expands to [soa::default]
[2012-08-29T09:25:43+02:00] INFO: Starting Chef Run for prgsoa001
[2012-08-29T09:25:43+02:00] INFO: Running start handlers
[2012-08-29T09:25:43+02:00] INFO: Start handlers complete.
[2012-08-29T09:25:43+02:00] INFO: [jan] test, test.
[2012-08-29T09:25:43+02:00] INFO: [jan] value, .
[2012-08-29T09:25:43+02:00] INFO: Chef Run complete in 0.010143 seconds
[2012-08-29T09:25:43+02:00] INFO: Running report handlers
[2012-08-29T09:25:43+02:00] INFO: Report handlers complete

As you can see, the

Jan Bareš
Calypso Lead Developer

In association with
WOOD & Company Financial Services, a.s.
Palladium, Náměstí Republiky 1079/1a
110 00 Prague, Czech Republic
Tel. +420 222 096 111
Direct +420 222 096 378
Fax. +420 222 096 222

DISCLAIMER
WOOD & Company Financial Services, a.s. and its branches are authorized and regulated by the CNB as Home State regulator and in Poland by the KNF, in Romania by the CNVM, in Slovakia by the NBS and in the UK by the FSA as Host State regulators. For further information about WOOD & Co., its investment services, financial instruments and associated risks, safeguard client assets (incl. compensation schemes) and contractual relationship please see our website at www.wood.cz under section Corporate Governance.

Unless otherwise stated, this transmission is neither an offer nor the solicitation of an offer to sell or purchase any investment. All estimates, opinions and other information contained herein are subject to change without notice and are provided in good faith but without legal responsibility or liability. Opinion may be personal to the author and may not reflect the opinions of WOOD & Co. Communications from sales persons, sales traders or traders should not be regarded as investment research and may contain opinions or trading ideas which are different from WOOD & Co. investment research opinions.

This e-mail and any attachments are confidential and may be privileged or otherwise protected from disclosure. If you are not a named addressee you must not use, disclose, distribute, copy, print or rely on this e-mail and any of its attachments. Please notify the sender that you have received this email by mistake by replying to the email, and then delete the email and any copies of it. Although WOOD & Co. routinely screens e-mails for viruses, addressees should scan this e-mail and any attachments for viruses. WOOD & Co. makes no representation or warranty as to the absence of viruses in this e-mail or any attachments. Please note that to ensure regulatory compliance and for the protection of our clients and business, we may monitor and read e-mails sent to and from our server(s).


#3

Hi,

I met same problem and am hoping to find answer from here.

Thank you.

Tetsu

On Aug 29, 2012, at 4:31 PM, Jan Bares jan.bares@wood.cz wrote:

Hi,

Can someone help me to understand this strange behaviour? As you can see bellow, value of node[:test_value2][“name”] magically disappears after I reference it for the first time. It should print:
[2012-08-29T09:25:43+02:00] INFO: [jan] value, value.
But it prints:
[2012-08-29T09:25:43+02:00] INFO: [jan] value, .

If this is known limitation of Chef, how can I reuse configuration data without retyping them?

Thanks, Jan

attributes/default.rb

default[:test1] = "test"
default[:test_value1] = default[:test1]

default[:test2] = {“name” => “value”}
default[:test_value2] = default[:test2]

recipes/default.rb

Chef::Log.info("[jan] #{node[:test_value1]}, #{node[:test_value1]}.")
Chef::Log.info("[jan] #{node[:test_value2][“name”]}, #{node[:test_value2][“name”]}.")

Output

[2012-08-29T09:25:42+02:00] INFO: *** Chef 10.12.0 ***
[2012-08-29T09:25:43+02:00] INFO: Setting the run_list to [“recipe[soa::default]
”] from JSON
[2012-08-29T09:25:43+02:00] INFO: Run List is [recipe[soa::default]]
[2012-08-29T09:25:43+02:00] INFO: Run List expands to [soa::default]
[2012-08-29T09:25:43+02:00] INFO: Starting Chef Run for prgsoa001
[2012-08-29T09:25:43+02:00] INFO: Running start handlers
[2012-08-29T09:25:43+02:00] INFO: Start handlers complete.
[2012-08-29T09:25:43+02:00] INFO: [jan] test, test.
[2012-08-29T09:25:43+02:00] INFO: [jan] value, .
[2012-08-29T09:25:43+02:00] INFO: Chef Run complete in 0.010143 seconds
[2012-08-29T09:25:43+02:00] INFO: Running report handlers
[2012-08-29T09:25:43+02:00] INFO: Report handlers complete

As you can see, the

Jan Bareš
Calypso Lead Developer

In association with
WOOD & Company Financial Services, a.s.
Palladium, Náměstí Republiky 1079/1a
110 00 Prague, Czech Republic
Tel. +420 222 096 111
Direct +420 222 096 378
Fax. +420 222 096 222

DISCLAIMER
WOOD & Company Financial Services, a.s. and its branches are authorized and regulated by the CNB as Home State regulator and in Poland by the KNF, in Romania by the CNVM, in Slovakia by the NBS and in the UK by the FSA as Host State regulators. For further information about WOOD & Co., its investment services, financial instruments and associated risks, safeguard client assets (incl. compensation schemes) and contractual relationship please see our website at www.wood.cz under section Corporate Governance.

Unless otherwise stated, this transmission is neither an offer nor the solicitation of an offer to sell or purchase any investment. All estimates, opinions and other information contained herein are subject to change without notice and are provided in good faith but without legal responsibility or liability. Opinion may be personal to the author and may not reflect the opinions of WOOD & Co. Communications from sales persons, sales traders or traders should not be regarded as investment research and may contain opinions or trading ideas which are different from WOOD & Co. investment research opinions.

This e-mail and any attachments are confidential and may be privileged or otherwise protected from disclosure. If you are not a named addressee you must not use, disclose, distribute, copy, print or rely on this e-mail and any of its attachments. Please notify the sender that you have received this email by mistake by replying to the email, and then delete the email and any copies of it. Although WOOD & Co. routinely screens e-mails for viruses, addressees should scan this e-mail and any attachments for viruses. WOOD & Co. makes no representation or warranty as to the absence of viruses in this e-mail or any attachments. Please note that to ensure regulatory compliance and for the protection of our clients and business, we may monitor and read e-mails sent to and from our server(s).