And why do not support 'break' ......
在 2019年1月3日星期四 UTC+8下午4:30:34，Simon Jones写道：
>
> Hi all,
>
> I'm using Jinja2 template to generate config files, but I found a BUG,
> which is I could not assign value in a loop, like this:
>
> 1) use this template, could generate 'uuusevrf'
>
> {% block vrf_mgmt_interface %}
> {% set usevrf = 'no' %}
> {% set usevrf = 'nono' %}
> {% if MGMT_INTERFACE %}
> {% set uuusevrf = 'yes' %}
> {% for (name, prefix) in MGMT_INTERFACE %}
> {% if name == 'eth0' %}
> {% if MGMT_INTERFACE[(name, prefix)].has_key('vrfname') %}
> {% if prefix | ipv4 %}
> USE_VRF=2
> IP_VERSION=4
> ETH_NAME=eth0
> ETH_IP={{ prefix | ip }}
> ETH_SUB_NET={{ prefix | network }}/{{ prefix | prefixlen }}
> ETH_LOOKUP_IP={{ prefix | ip }}
> VRFNAME={{ MGMT_INTERFACE[(name, prefix)]['vrfname'] }}
> GWADDR={{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }}
> {% else %}
> USE_VRF=2
> IP_VERSION=6
> ETH_NAME=eth0
> ETH_IP={{ prefix | ip }}
> ETH_SUB_NET={{ prefix | network }}/{{ prefix | prefixlen }}
> ETH_LOOKUP_IP={{ prefix | ip }}
> VRFNAME={{ MGMT_INTERFACE[(name, prefix)]['vrfname'] }}
> GWADDR={{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }}
> {% endif %}
> {% else %}
> USE_VRF=1
> {% endif %}
> {% endif %}
> {% endfor %}
> {% endif %}
> {{ usevrf }}
> {{ uuusevrf }}
> {% endblock vrf_mgmt_interface %}
>
>
> 2) could generate 'uuusevrf', this is result:
>
> rfaces.j211:~# sonic-cfggen -d -t
> /usr/share/sonic/templates/vrf_management_inter
> USE_VRF=2
> IP_VERSION=4
> ETH_NAME=eth0
> ETH_IP=172.18.8.211
> ETH_SUB_NET=172.18.8.0/24
> ETH_LOOKUP_IP=172.18.8.211
> VRFNAME=mgmtvrf
> GWADDR=172.18.8.1
> nono
> yes
>
>
> 2) use this template, could NOT generate 'uuusevrf'
>
> {% block vrf_mgmt_interface %}
> {% set usevrf = 'no' %}
> {% set usevrf = 'nono' %}
> {% if MGMT_INTERFACE %}
> {% for (name, prefix) in MGMT_INTERFACE %}
> {% set uuusevrf = 'yes' %}
> {% if name == 'eth0' %}
> {% if MGMT_INTERFACE[(name, prefix)].has_key('vrfname') %}
> {% if prefix | ipv4 %}
> USE_VRF=2
> IP_VERSION=4
> ETH_NAME=eth0
> ETH_IP={{ prefix | ip }}
> ETH_SUB_NET={{ prefix | network }}/{{ prefix | prefixlen }}
> ETH_LOOKUP_IP={{ prefix | ip }}
> VRFNAME={{ MGMT_INTERFACE[(name, prefix)]['vrfname'] }}
> GWADDR={{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }}
> {% else %}
> USE_VRF=2
> IP_VERSION=6
> ETH_NAME=eth0
> ETH_IP={{ prefix | ip }}
> ETH_SUB_NET={{ prefix | network }}/{{ prefix | prefixlen }}
> ETH_LOOKUP_IP={{ prefix | ip }}
> VRFNAME={{ MGMT_INTERFACE[(name, prefix)]['vrfname'] }}
> GWADDR={{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }}
> {% endif %}
> {% else %}
> USE_VRF=1
> {% endif %}
> {% endif %}
> {% endfor %}
> {% endif %}
> {{ usevrf }}
> {{ uuusevrf }}
> {% endblock vrf_mgmt_interface %}
>
> 4) could NOT generate, this is result:
>
> rfaces.j211:~# sonic-cfggen -d -t
> /usr/share/sonic/templates/vrf_management_inter
> USE_VRF=2
> IP_VERSION=4
> ETH_NAME=eth0
> ETH_IP=172.18.8.211
> ETH_SUB_NET=172.18.8.0/24
> ETH_LOOKUP_IP=172.18.8.211
> VRFNAME=mgmtvrf
> GWADDR=172.18.8.1
> nono
>
> So, why ???
>
> You could see that, same data, just the position of this line ({% set
> uuusevrf = 'yes' %}) is different. And the result show it definitely go
> into loop, but why this line NOT work ???
>
> BTW, It's hard to debug !!!!!!
>
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