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Bug #17703

closed

Jinja2 vars.sys.ipv4 issue

Added by Alexander Brunhirl over 4 years ago. Updated over 4 years ago.

Status:
Resolved
Priority:
N/A
Assignee:
-
Category:
System techniques
Target version:
-
Pull Request:
Severity:
UX impact:
User visibility:
Effort required:
Priority:
0
Name check:
To do
Fix check:
To do
Regression:

Description

Hi,

it seems like via Jinja2 the 'sys.ipv4[eth0]' is not properly resolved.

# cf-promises --show-vars  |grep sys.ipv4
default:sys.ipv4            192.168.1.22         inventory,source=agent,attribute_name=none
default:sys.ipv4[eth0]      192.168.1.22         source=agent
default:sys.ipv4[eth1]      10.0.1.22            source=agent
default:sys.ipv4[lo]        127.0.0.1            source=agent
        [...]
# rudder agent run -qu
        [...]
E| repaired      fileTemplate              Load Template from a fil| /root/ips.txt    | The copy of the file /var/rudder/configuration-repository/shared-files/ips.tpl from the policy server to /var/rudder/tmp/templates/ips.tpl was repaired
E| repaired      fileTemplate              Expand template           /root/ips.txt    | The expansion of the template /var/rudder/tmp/templates/ips.tpl in /root/ips.txt was repaired
        [...]
# cat /var/rudder/configuration-repository/shared-files/ips.tpl
eth0: {{ vars.sys.ipv4[eth0] }}
eth1: {{ vars.sys.ipv4[eth1] }}
# cat /root/ips.txt
#

Tried so far:

{{ vars.sys.ipv4[eth0] }}
{{ vars.sys.ipv4.eth0 }}
{{ vars.sys.ipv4'['eth0']' }}
{{ vars.sys.ipv4'[eth0]' }}

Best regards,
Alex

[1] https://jinja.palletsprojects.com/en/2.11.x/templates/#variables

Rudder agent: 6.0.5.release
Jinja2:
  • python36-jinja2-2.11.1-1.el7.noarch (CentOS 7)
  • python3-Jinja2-2.8-19.17.1.noarch (SLES12 SP4)
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 #1

Updated by François ARMAND over 4 years ago

In jinja, access to variable is all doted: {{vars.sys.ipv4.eth0}}

We clarified all this difference in new variable documentation here: https://docs.rudder.io/reference/6.1/usage/variables.html (it's for 6.1, but that part is the same in previous version).

Hope it helps

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 #2

Updated by Alexander Brunhirl over 4 years ago

In jinja, access to variable is all doted: {{vars.sys.ipv4.eth0}}

I tried it but didn't work as expected. The output file is still rendered empty

# rudder agent run -qu
        [...]
E| repaired      fileTemplate              Load Template from a fil| /root/ips.txt    | The copy of the file /var/rudder/configuration-repository/shared-files/ips.tpl from the policy server to /var/rudder/tmp/templates/ips.tpl was repaired
E| repaired      fileTemplate              Expand template           /root/ips.txt    | The expansion of the template /var/rudder/tmp/templates/ips.tpl in /root/ips.txt was repaired
        [...]
# cat /var/rudder/configuration-repository/shared-files/ips.tpl
eth0: {{ vars.sys.ipv4.eth0 }}
eth1: {{ vars.sys.ipv4.eth1 }}
# cat /root/ips.txt
#
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 #3

Updated by Alexis Mousset over 4 years ago

The problem is that the system variable is not an array:

      "ipv4": "10.0.2.15",
      "ipv4[enp0s3]": "10.0.2.15",
      "ipv4[enp0s8]": "192.168.41.2",
      "ipv4[lo]": "127.0.0.1",
      "ipv4_1[enp0s3]": "10",
      "ipv4_1[enp0s8]": "192",
      "ipv4_1[lo]": "127",
      "ipv4_2[enp0s3]": "10.0",
      "ipv4_2[enp0s8]": "192.168",
      "ipv4_2[lo]": "127.0",
      "ipv4_3[enp0s3]": "10.0.2",
      "ipv4_3[enp0s8]": "192.168.41",
      "ipv4_3[lo]": "127.0.0",

so we need to access ipv4_3[lo] as key name.

jinja2 has actually two syntaxes for key access : . or [''] (with quotes), so as the variable name contains [] we need to use the second one

{{ vars.sys['ipv4[enp0s3]'] }} should work.

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 #4

Updated by Alexander Brunhirl over 4 years ago

jinja2 has actually two syntaxes for key access : . or [''] (with quotes), so as the variable name contains [] we need to use the second one
{{ vars.sys['ipv4[enp0s3]'] }} should work.

perfect, now it works like a charm. I thank you :)

# rudder agent run -qu
        [...]
E| repaired      fileTemplate              Load Template from a fil| /root/ips.txt    | The copy of the file /var/rudder/configuration-repository/shared-files/ips.tpl from the policy server to /var/rudder/tmp/templates/ips.tpl was repaired
E| repaired      fileTemplate              Expand template           /root/ips.txt    | The expansion of the template /var/rudder/tmp/templates/ips.tpl in /root/ips.txt was repaired
        [...]
# cat /var/rudder/configuration-repository/shared-files/ips.tpl
eth0: {{ vars.sys['ipv4[eth0]'] }}
eth1: {{ vars.sys['ipv4[eth1]'] }}
# cat /root/ips.txt
192.168.1.22
10.0.1.22
#
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 #5

Updated by François ARMAND over 4 years ago

  • Status changed from New to Resolved
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