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salt/doc/topics/jinja/index.rst

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.. _understanding-jinja:
===================
Understanding Jinja
===================
`Jinja <http://jinja.pocoo.org/docs/>`_ is the default templating language
in SLS files.
Jinja in States
===============
.. _Jinja: http://jinja.pocoo.org/docs/templates/
Jinja is evaluated before YAML, which means it is evaluated before the States
are run.
The most basic usage of Jinja in state files is using control structures to
wrap conditional or redundant state elements:
.. code-block:: jinja
{% if grains['os'] != 'FreeBSD' %}
tcsh:
pkg:
- installed
{% endif %}
motd:
file.managed:
{% if grains['os'] == 'FreeBSD' %}
- name: /etc/motd
{% elif grains['os'] == 'Debian' %}
- name: /etc/motd.tail
{% endif %}
- source: salt://motd
In this example, the first if block will only be evaluated on minions that
aren't running FreeBSD, and the second block changes the file name based on the
*os* grain.
Writing **if-else** blocks can lead to very redundant state files however. In
this case, using :ref:`pillars<pillar>`, or using a previously
defined variable might be easier:
.. code-block:: jinja
{% set motd = ['/etc/motd'] %}
{% if grains['os'] == 'Debian' %}
{% set motd = ['/etc/motd.tail', '/var/run/motd'] %}
{% endif %}
{% for motdfile in motd %}
{{ motdfile }}:
file.managed:
- source: salt://motd
{% endfor %}
Using a variable set by the template, the `for loop`_ will iterate over the
list of MOTD files to update, adding a state block for each file.
The filter_by function can also be used to set variables based on grains:
.. code-block:: jinja
{% set auditd = salt['grains.filter_by']({
'RedHat': { 'package': 'audit' },
'Debian': { 'package': 'auditd' },
}) %}
.. _`for loop`: http://jinja.pocoo.org/docs/templates/#for
Include and Import
==================
Includes and imports_ can be used to share common, reusable state configuration
between state files and between files.
.. code-block:: jinja
{% from 'lib.sls' import test %}
This would import the ``test`` template variable or macro, not the ``test``
state element, from the file ``lib.sls``. In the case that the included file
performs checks against grains, or something else that requires context, passing
the context into the included file is required:
.. code-block:: jinja
{% from 'lib.sls' import test with context %}
Including Context During Include/Import
---------------------------------------
By adding ``with context`` to the include/import directive, the
current context can be passed to an included/imported template.
.. code-block:: jinja
{% import 'openssl/vars.sls' as ssl with context %}
.. _imports: http://jinja.pocoo.org/docs/templates/#import
Macros
======
Macros_ are helpful for eliminating redundant code. Macros are most useful as
mini-templates to repeat blocks of strings with a few parameterized variables.
Be aware that stripping whitespace from the template block, as well as
contained blocks, may be necessary to emulate a variable return from the macro.
.. code-block:: jinja
# init.sls
{% from 'lib.sls' import pythonpkg with context %}
python-virtualenv:
pkg.installed:
- name: {{ pythonpkg('virtualenv') }}
python-fabric:
pkg.installed:
- name: {{ pythonpkg('fabric') }}
.. code-block:: jinja
# lib.sls
{% macro pythonpkg(pkg) -%}
{%- if grains['os'] == 'FreeBSD' -%}
py27-{{ pkg }}
{%- elif grains['os'] == 'Debian' -%}
python-{{ pkg }}
{%- endif -%}
{%- endmacro %}
This would define a macro_ that would return a string of the full package name,
depending on the packaging system's naming convention. The whitespace of the
macro was eliminated, so that the macro would return a string without line
breaks, using `whitespace control`_.
Template Inheritance
====================
`Template inheritance`_ works fine from state files and files. The search path
starts at the root of the state tree or pillar.
.. _`Template inheritance`: http://jinja.pocoo.org/docs/templates/#template-inheritance
.. _`Macros`: http://jinja.pocoo.org/docs/templates/#macros
.. _`macro`: http://jinja.pocoo.org/docs/templates/#macros
.. _`whitespace control`: http://jinja.pocoo.org/docs/templates/#whitespace-control
Filters
=======
Saltstack extends `builtin filters`_ with these custom filters:
.. jinja_ref:: strftime
``strftime``
------------
Converts any time related object into a time based string. It requires a
valid :ref:`strftime directives <python2:strftime-strptime-behavior>`. An
:ref:`exhaustive list <python2:strftime-strptime-behavior>` can be found in
the official Python documentation.
.. code-block:: jinja
{% set curtime = None | strftime() %}
Fuzzy dates require the `timelib`_ Python module is installed.
.. code-block:: jinja
{{ "2002/12/25"|strftime("%y") }}
{{ "1040814000"|strftime("%Y-%m-%d") }}
{{ datetime|strftime("%u") }}
{{ "tomorrow"|strftime }}
.. jinja_ref:: sequence
``sequence``
------------
Ensure that parsed data is a sequence.
.. jinja_ref:: yaml_encode
``yaml_encode``
---------------
Serializes a single object into a YAML scalar with any necessary
handling for escaping special characters. This will work for any
scalar YAML data type: ints, floats, timestamps, booleans, strings,
unicode. It will *not* work for multi-objects such as sequences or
maps.
.. code-block:: jinja
{%- set bar = 7 %}
{%- set baz = none %}
{%- set zip = true %}
{%- set zap = 'The word of the day is "salty"' %}
{%- load_yaml as foo %}
bar: {{ bar|yaml_encode }}
baz: {{ baz|yaml_encode }}
baz: {{ zip|yaml_encode }}
baz: {{ zap|yaml_encode }}
{%- endload %}
In the above case ``{{ bar }}`` and ``{{ foo.bar }}`` should be
identical and ``{{ baz }}`` and ``{{ foo.baz }}`` should be
identical.
.. jinja_ref:: yaml_dquote
``yaml_dquote``
---------------
Serializes a string into a properly-escaped YAML double-quoted
string. This is useful when the contents of a string are unknown
and may contain quotes or unicode that needs to be preserved. The
resulting string will be emitted with opening and closing double
quotes.
.. code-block:: jinja
{%- set bar = '"The quick brown fox . . ."' %}
{%- set baz = 'The word of the day is "salty".' %}
{%- load_yaml as foo %}
bar: {{ bar|yaml_dquote }}
baz: {{ baz|yaml_dquote }}
{%- endload %}
In the above case ``{{ bar }}`` and ``{{ foo.bar }}`` should be
identical and ``{{ baz }}`` and ``{{ foo.baz }}`` should be
identical. If variable contents are not guaranteed to be a string
then it is better to use ``yaml_encode`` which handles all YAML
scalar types.
.. jinja_ref:: yaml_squote
``yaml_squote``
---------------
Similar to the ``yaml_dquote`` filter but with single quotes. Note
that YAML only allows special escapes inside double quotes so
``yaml_squote`` is not nearly as useful (viz. you likely want to
use ``yaml_encode`` or ``yaml_dquote``).
.. jinja_ref:: to_bool
``to_bool``
-----------
.. versionadded:: 2017.7.0
Returns the logical value of an element.
Example:
.. code-block:: jinja
{{ 'yes' | to_bool }}
{{ 'true' | to_bool }}
{{ 1 | to_bool }}
{{ 'no' | to_bool }}
Will be rendered as:
.. code-block:: python
True
True
True
False
.. jinja_ref:: exactly_n_true
``exactly_n_true``
------------------
.. versionadded:: 2017.7.0
Tests that exactly N items in an iterable are "truthy" (neither None, False, nor 0).
Example:
.. code-block:: jinja
{{ ['yes', 0, False, 'True'] | exactly_n_true(2) }}
Returns:
.. code-block:: python
True
.. jinja_ref:: exactly_one_true
``exactly_one_true``
--------------------
.. versionadded:: 2017.7.0
Tests that exactly one item in an iterable is "truthy" (neither None, False, nor 0).
Example:
.. code-block:: jinja
{{ ['yes', False, 0, None] | exactly_one_true }}
Returns:
.. code-block:: python
True
.. jinja_ref:: quote
``quote``
---------
.. versionadded:: 2017.7.0
This text will be wrapped in quotes.
.. jinja_ref:: regex_search
``regex_search``
----------------
.. versionadded:: 2017.7.0
Scan through string looking for a location where this regular expression
produces a match. Returns ``None`` in case there were no matches found
Example:
.. code-block:: jinja
{{ 'abcdefabcdef' | regex_search('BC(.*)', ignorecase=True) }}
Returns:
.. code-block:: python
('defabcdef',)
.. jinja_ref:: regex_match
``regex_match``
---------------
.. versionadded:: 2017.7.0
If zero or more characters at the beginning of string match this regular
expression, otherwise returns ``None``.
Example:
.. code-block:: jinja
{{ 'abcdefabcdef' | regex_match('BC(.*)', ignorecase=True) }}
Returns:
.. code-block:: text
None
.. jinja_ref:: uuid
``uuid``
--------
.. versionadded:: 2017.7.0
Return a UUID.
Example:
.. code-block:: jinja
{{ 'random' | uuid }}
Returns:
.. code-block:: text
3652b285-26ad-588e-a5dc-c2ee65edc804
.. jinja_ref:: is_list
``is_list``
-----------
.. versionadded:: 2017.7.0
Return if an object is list.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | is_list }}
Returns:
.. code-block:: python
True
.. jinja_ref:: is_iter
``is_iter``
-----------
.. versionadded:: 2017.7.0
Return if an object is iterable.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | is_iter }}
Returns:
.. code-block:: python
True
.. jinja_ref:: min
``min``
-------
.. versionadded:: 2017.7.0
Return the minimum value from a list.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | min }}
Returns:
.. code-block:: text
1
.. jinja_ref:: max
``max``
-------
.. versionadded:: 2017.7.0
Returns the maximum value from a list.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | max }}
Returns:
.. code-block:: text
3
.. jinja_ref:: avg
``avg``
-------
.. versionadded:: 2017.7.0
Returns the average value of the elements of a list
Example:
.. code-block:: jinja
{{ [1, 2, 3] | avg }}
Returns:
.. code-block:: text
2
.. jinja_ref:: union
``union``
---------
.. versionadded:: 2017.7.0
Return the union of two lists.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | union([2, 3, 4]) | join(', ') }}
Returns:
.. code-block:: text
1, 2, 3, 4
.. jinja_ref:: intersect
``intersect``
-------------
.. versionadded:: 2017.7.0
Return the intersection of two lists.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | intersect([2, 3, 4]) | join(', ') }}
Returns:
.. code-block:: text
2, 3
.. jinja_ref:: difference
``difference``
--------------
.. versionadded:: 2017.7.0
Return the difference of two lists.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | difference([2, 3, 4]) | join(', ') }}
Returns:
.. code-block:: text
1
.. jinja_ref:: symmetric_difference
``symmetric_difference``
------------------------
.. versionadded:: 2017.7.0
Return the symmetric difference of two lists.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | symmetric_difference([2, 3, 4]) | join(', ') }}
Returns:
.. code-block:: text
1, 4
.. jinja_ref:: is_sorted
``is_sorted``
-------------
.. versionadded:: 2017.7.0
Return is an iterable object is already sorted.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | is_sorted }}
Returns:
.. code-block:: python
True
.. jinja_ref:: compare_lists
``compare_lists``
-----------------
.. versionadded:: 2017.7.0
Compare two lists and return a dictionary with the changes.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | compare_lists([1, 2, 4]) }}
Returns:
.. code-block:: python
{'new': 4, 'old': 3}
.. jinja_ref:: compare_dicts
``compare_dicts``
-----------------
.. versionadded:: 2017.7.0
Compare two dictionaries and return a dictionary with the changes.
Example:
.. code-block:: jinja
{{ {'a': 'b'} | compare_lists({'a': 'c'}) }}
Returns:
.. code-block:: python
{'a': {'new': 'c', 'old': 'b'}}
.. jinja_ref:: is_hex
``is_hex``
----------
.. versionadded:: 2017.7.0
Return True if the value is hexazecimal.
Example:
.. code-block:: jinja
{{ '0xabcd' | is_hex }}
{{ 'xyzt' | is_hex }}
Returns:
.. code-block:: python
True
False
.. jinja_ref:: contains_whitespace
``contains_whitespace``
-----------------------
.. versionadded:: 2017.7.0
Return True if a text contains whitespaces.
Example:
.. code-block:: jinja
{{ 'abcd' | contains_whitespace }}
{{ 'ab cd' | contains_whitespace }}
Returns:
.. code-block:: python
False
True
.. jinja_ref:: substring_in_list
``substring_in_list``
---------------------
.. versionadded:: 2017.7.0
Return is a substring is found in a list of string values.
Example:
.. code-block:: jinja
{{ 'abcd' | substring_in_list(['this', 'is', 'an abcd example']) }}
Returns:
.. code-block:: python
True
.. jinja_ref:: check_whitelist_blacklist
``check_whitelist_blacklist``
-----------------------------
.. versionadded:: 2017.7.0
Check a whitelist and/or blacklist to see if the value matches it.
This filter can be used with either a whitelist or a blacklist individually,
or a whitelist and a blacklist can be passed simultaneously.
If whitelist is used alone, value membership is checked against the
whitelist only. If the value is found, the function returns ``True``.
Otherwise, it returns ``False``.
If blacklist is used alone, value membership is checked against the
blacklist only. If the value is found, the function returns ``False``.
Otherwise, it returns ``True``.
If both a whitelist and a blacklist are provided, value membership in the
blacklist will be examined first. If the value is not found in the blacklist,
then the whitelist is checked. If the value isn't found in the whitelist,
the function returns ``False``.
Whitelist Example:
.. code-block:: jinja
{{ 5 | check_whitelist_blacklist(whitelist=[5, 6, 7]) }}
Returns:
.. code-block:: python
True
Blacklist Example:
.. code-block:: jinja
{{ 5 | check_whitelist_blacklist(blacklist=[5, 6, 7]) }}
.. code-block:: python
False
.. jinja_ref:: date_format
``date_format``
---------------
.. versionadded:: 2017.7.0
Converts unix timestamp into human-readable string.
Example:
.. code-block:: jinja
{{ 1457456400 | date_format }}
{{ 1457456400 | date_format('%d.%m.%Y %H:%M') }}
Returns:
.. code-block:: text
2017-03-08
08.03.2017 17:00
.. jinja_ref:: str_to_num
``str_to_num``
--------------
.. versionadded:: 2017.7.0
Converts a string to its numerical value.
Example:
.. code-block:: jinja
{{ '5' | str_to_num }}
Returns:
.. code-block:: python
5
.. jinja_ref:: to_bytes
``to_bytes``
------------
.. versionadded:: 2017.7.0
Converts string-type object to bytes.
Example:
.. code-block:: jinja
{{ 'wall of text' | to_bytes }}
.. note::
This option may have adverse effects when using the default renderer, ``yaml_jinja``.
This is due to the fact that YAML requires proper handling in regard to special
characters. Please see the section on :ref:`YAML ASCII support <yaml_plain_ascii>`
in the :ref:`YAML Idiosyncracies <yaml-idiosyncrasies>` documentation for more
information.
.. jinja_ref:: json_decode_list
``json_decode_list``
--------------------
.. versionadded:: 2017.7.0
JSON decodes as unicode, Jinja needs bytes.
Example:
.. code-block:: jinja
{{ [1, 2, 3] | json_decode_list }}
Returns:
.. code-block:: python
[1, 2, 3]
.. jinja_ref:: json_decode_dict
``json_decode_dict``
--------------------
.. versionadded:: 2017.7.0
JSON decodes as unicode, Jinja needs bytes.
Example:
.. code-block:: jinja
{{ {'a': 'b'} | json_decode_dict }}
Returns:
.. code-block:: python
{'a': 'b'}
.. jinja_ref:: rand_str
``rand_str``
------------
.. versionadded:: 2017.7.0
Generate a random string and applies a hash. Default hashing: md5.
Example:
.. code-block:: jinja
{% set passwd_length = 17 %}
{{ passwd_length | rand_str }}
{{ passwd_length | rand_str('sha512') }}
Returns:
.. code-block:: text
43ec517d68b6edd3015b3edc9a11367b
d94a45acd81f8e3107d237dbc0d5d195f6a52a0d188bc0284c0763ece1eac9f9496fb6a531a296074c87b3540398dace1222b42e150e67c9301383fde3d66ae5
.. jinja_ref:: md5
``md5``
-------
.. versionadded:: 2017.7.0
Return the md5 digest of a string.
Example:
.. code-block:: jinja
{{ 'random' | md5 }}
Returns:
.. code-block:: text
7ddf32e17a6ac5ce04a8ecbf782ca509
.. jinja_ref:: sha256
``sha256``
----------
.. versionadded:: 2017.7.0
Return the sha256 digest of a string.
Example:
.. code-block:: jinja
{{ 'random' | sha256 }}
Returns:
.. code-block:: text
a441b15fe9a3cf56661190a0b93b9dec7d04127288cc87250967cf3b52894d11
.. jinja_ref:: sha512
``sha512``
----------
.. versionadded:: 2017.7.0
Return the sha512 digest of a string.
Example:
.. code-block:: jinja
{{ 'random' | sha512 }}
Returns:
.. code-block:: text
811a90e1c8e86c7b4c0eef5b2c0bf0ec1b19c4b1b5a242e6455be93787cb473cb7bc9b0fdeb960d00d5c6881c2094dd63c5c900ce9057255e2a4e271fc25fef1
.. jinja_ref:: base64_encode
``base64_encode``
-----------------
.. versionadded:: 2017.7.0
Encode a string as base64.
Example:
.. code-block:: jinja
{{ 'random' | base64_encode }}
Returns:
.. code-block:: text
cmFuZG9t
.. jinja_ref:: base64_decode
``base64_decode``
-----------------
.. versionadded:: 2017.7.0
Decode a base64-encoded string.
.. code-block:: jinja
{{ 'Z2V0IHNhbHRlZA==' | base64_decode }}
Returns:
.. code-block:: text
get salted
.. jinja_ref:: hmac
``hmac``
--------
.. versionadded:: 2017.7.0
Verify a challenging hmac signature against a string / shared-secret. Returns
a boolean value.
Example:
.. code-block:: jinja
{{ 'get salted' | hmac('shared secret', 'eBWf9bstXg+NiP5AOwppB5HMvZiYMPzEM9W5YMm/AmQ=') }}
Returns:
.. code-block:: python
True
.. jinja_ref:: http_query
``http_query``
--------------
.. versionadded:: 2017.7.0
Return the HTTP reply object from a URL.
Example:
.. code-block:: jinja
{{ 'http://jsonplaceholder.typicode.com/posts/1' | http_query }}
Returns:
.. code-block:: python
{
'body': '{
"userId": 1,
"id": 1,
"title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
"body": "quia et suscipit\\nsuscipit recusandae consequuntur expedita et cum\\nreprehenderit molestiae ut ut quas totam\\nnostrum rerum est autem sunt rem eveniet architecto"
}'
}
.. _`builtin filters`: http://jinja.pocoo.org/docs/templates/#builtin-filters
.. _`timelib`: https://github.com/pediapress/timelib/
Networking Filters
------------------
The following networking-related filters are supported:
.. jinja_ref:: is_ip
``is_ip``
---------
.. versionadded:: 2017.7.0
Return if a string is a valid IP Address.
.. code-block:: jinja
{{ '192.168.0.1' | is_ip }}
Additionally accepts the following options:
- global
- link-local
- loopback
- multicast
- private
- public
- reserved
- site-local
- unspecified
Example - test if a string is a valid loopback IP address.
.. code-block:: jinja
{{ '192.168.0.1' | is_ip(options='loopback') }}
.. jinja_ref:: is_ipv4
``is_ipv4``
-----------
.. versionadded:: 2017.7.0
Returns if a string is a valid IPv4 address. Supports the same options
as ``is_ip``.
.. code-block:: jinja
{{ '192.168.0.1' | is_ipv4 }}
.. jinja_ref:: is_ipv6
``is_ipv6``
-----------
.. versionadded:: 2017.7.0
Returns if a string is a valid IPv6 address. Supports the same options
as ``is_ip``.
.. code-block:: jinja
{{ 'fe80::' | is_ipv6 }}
.. jinja_ref:: ipaddr
``ipaddr``
----------
.. versionadded:: 2017.7.0
From a list, returns only valid IP entries. Supports the same options
as ``is_ip``. The list can contains also IP interfaces/networks.
Example:
.. code-block:: jinja
{{ ['192.168.0.1', 'foo', 'bar', 'fe80::'] | ipaddr }}
Returns:
.. code-block:: python
['192.168.0.1', 'fe80::']
.. jinja_ref:: ipv4
``ipv4``
--------
.. versionadded:: 2017.7.0
From a list, returns only valid IPv4 entries. Supports the same options
as ``is_ip``. The list can contains also IP interfaces/networks.
Example:
.. code-block:: jinja
{{ ['192.168.0.1', 'foo', 'bar', 'fe80::'] | ipv4 }}
Returns:
.. code-block:: python
['192.168.0.1']
.. jinja_ref:: ipv6
``ipv6``
--------
.. versionadded:: 2017.7.0
From a list, returns only valid IPv6 entries. Supports the same options
as ``is_ip``. The list can contains also IP interfaces/networks.
Example:
.. code-block:: jinja
{{ ['192.168.0.1', 'foo', 'bar', 'fe80::'] | ipv6 }}
Returns:
.. code-block:: python
['fe80::']
.. jinja_ref:: network_hosts
``network_hosts``
-----------------
.. versionadded:: 2017.7.0
Return the list of hosts within a networks.
Example:
.. code-block:: jinja
{{ '192.168.0.1/30' | network_hosts }}
Returns:
.. code-block:: python
['192.168.0.1', '192.168.0.2']
.. jinja_ref:: network_size
``network_size``
----------------
.. versionadded:: 2017.7.0
Return the size of the network. This utility works for both IPv4 and IPv6.
Example:
.. code-block:: jinja
{{ '192.168.0.1/8' | network_size }}
Returns:
.. code-block:: python
16777216
.. jinja_ref:: gen_mac
``gen_mac``
-----------
.. versionadded:: 2017.7.0
Generates a MAC address with the defined OUI prefix.
Common prefixes:
- ``00:16:3E`` -- Xen
- ``00:18:51`` -- OpenVZ
- ``00:50:56`` -- VMware (manually generated)
- ``52:54:00`` -- QEMU/KVM
- ``AC:DE:48`` -- PRIVATE
Example:
.. code-block:: jinja
{{ '00:50' | gen_mac }}
Returns:
.. code-block:: text
00:50:71:52:1C
.. jinja_ref:: mac_str_to_bytes
``mac_str_to_bytes``
--------------------
.. versionadded:: 2017.7.0
Converts a string representing a valid MAC address to bytes.
Example:
.. code-block:: jinja
{{ '00:11:22:33:44:55' | mac_str_to_bytes }}
.. note::
This option may have adverse effects when using the default renderer, ``yaml_jinja``.
This is due to the fact that YAML requires proper handling in regard to special
characters. Please see the section on :ref:`YAML ASCII support <yaml_plain_ascii>`
in the :ref:`YAML Idiosyncracies <yaml-idiosyncrasies>` documentation for more
information.
.. jinja_ref:: dns_check
``dns_check``
-------------
.. versionadded:: 2017.7.0
Return the ip resolved by dns, but do not exit on failure, only raise an
exception. Obeys system preference for IPv4/6 address resolution.
Example:
.. code-block:: jinja
{{ 'www.google.com' | dns_check }}
Returns:
.. code-block:: text
'172.217.3.196'
File filters
------------
.. jinja_ref:: is_text_file
``is_text_file``
----------------
.. versionadded:: 2017.7.0
Return if a file is text.
Uses heuristics to guess whether the given file is text or binary,
by reading a single block of bytes from the file.
If more than 30% of the chars in the block are non-text, or there
are NUL ('\x00') bytes in the block, assume this is a binary file.
Example:
.. code-block:: jinja
{{ '/etc/salt/master' | is_text_file }}
Returns:
.. code-block:: python
True
.. jinja_ref:: is_binary_file
``is_binary_file``
------------------
.. versionadded:: 2017.7.0
Return if a file is binary.
Detects if the file is a binary, returns bool. Returns True if the file is
a bin, False if the file is not and None if the file is not available.
Example:
.. code-block:: jinja
{{ '/etc/salt/master' | is_binary_file }}
Returns:
.. code-block:: python
False
.. jinja_ref:: is_empty_file
``is_empty_file``
-----------------
.. versionadded:: 2017.7.0
Return if a file is empty.
Example:
.. code-block:: jinja
{{ '/etc/salt/master' | is_empty_file }}
Returns:
.. code-block:: python
False
.. jinja_ref:: file_hashsum
``file_hashsum``
----------------
.. versionadded:: 2017.7.0
Return the hashsum of a file.
Example:
.. code-block:: jinja
{{ '/etc/salt/master' | file_hashsum }}
Returns:
.. code-block:: text
02d4ef135514934759634f10079653252c7ad594ea97bd385480c532bca0fdda
.. jinja_ref:: list_files
``list_files``
--------------
.. versionadded:: 2017.7.0
Return a recursive list of files under a specific path.
Example:
.. code-block:: jinja
{{ '/etc/salt/' | list_files | join('\n') }}
Returns:
.. code-block:: text
/etc/salt/master
/etc/salt/proxy
/etc/salt/minion
/etc/salt/pillar/top.sls
/etc/salt/pillar/device1.sls
.. jinja_ref:: path_join
``path_join``
-------------
.. versionadded:: 2017.7.0
Joins absolute paths.
Example:
.. code-block:: jinja
{{ '/etc/salt/' | path_join('pillar', 'device1.sls') }}
Returns:
.. code-block:: text
/etc/salt/pillar/device1.sls
.. jinja_ref:: which
``which``
---------
.. versionadded:: 2017.7.0
Python clone of /usr/bin/which.
Example:
.. code-block:: jinja
{{ 'salt-master' | which }}
Returns:
.. code-block:: text
/usr/local/salt/virtualenv/bin/salt-master
.. jinja_ref:: jinja-in-files
Jinja in Files
==============
Jinja_ can be used in the same way in managed files:
.. code-block:: yaml
# redis.sls
/etc/redis/redis.conf:
file.managed:
- source: salt://redis.conf
- template: jinja
- context:
bind: 127.0.0.1
.. code-block:: jinja
# lib.sls
{% set port = 6379 %}
.. code-block:: ini
# redis.conf
{% from 'lib.sls' import port with context %}
port {{ port }}
bind {{ bind }}
As an example, configuration was pulled from the file context and from an
external template file.
.. note::
Macros and variables can be shared across templates. They should not be
starting with one or more underscores, and should be managed by one of the
following tags: `macro`, `set`, `load_yaml`, `load_json`, `import_yaml` and
`import_json`.
.. jinja_ref:: escaping-jinja
Escaping Jinja
==============
Occasionally, it may be necessary to escape Jinja syntax. There are two ways
to do this in Jinja. One is escaping individual variables or strings and the
other is to escape entire blocks.
To escape a string commonly used in Jinja syntax such as ``{{``, you can use the
following syntax:
.. code-block:: jinja
{{ '{{' }}
For larger blocks that contain Jinja syntax that needs to be escaped, you can use
raw blocks:
.. code-block:: jinja
{% raw %}
some text that contains jinja characters that need to be escaped
{% endraw %}
See the `Escaping`_ section of Jinja's documentation to learn more.
A real-word example of needing to use raw tags to escape a larger block of code
is when using ``file.managed`` with the ``contents_pillar`` option to manage
files that contain something like consul-template, which shares a syntax subset
with Jinja. Raw blocks are necessary here because the Jinja in the pillar would
be rendered before the file.managed is ever called, so the Jinja syntax must be
escaped:
.. code-block:: jinja
{% raw %}
- contents_pillar: |
job "example-job" {
<snipped>
task "example" {
driver = "docker"
config {
image = "docker-registry.service.consul:5000/example-job:{{key "nomad/jobs/example-job/version"}}"
<snipped>
{% endraw %}
.. _`Escaping`: http://jinja.pocoo.org/docs/dev/templates/#escaping
.. jinja_ref:: calling-salt-functions
Calling Salt Functions
======================
The Jinja renderer provides a shorthand lookup syntax for the ``salt``
dictionary of :term:`execution function <Execution Function>`.
.. versionadded:: 2014.7.0
.. code-block:: jinja
# The following two function calls are equivalent.
{{ salt['cmd.run']('whoami') }}
{{ salt.cmd.run('whoami') }}
.. jinja_ref:: debugging
Debugging
=========
The ``show_full_context`` function can be used to output all variables present
in the current Jinja context.
.. versionadded:: 2014.7.0
.. code-block:: jinja
Context is: {{ show_full_context() }}
.. jinja_ref:: logs
Logs
----
.. versionadded:: 2017.7.0
Yes, in Salt, one is able to debug a complex Jinja template using the logs.
For example, making the call:
.. code-block:: yaml
{%- do salt.log.error('testing jinja logging') -%}
Will insert the following message in the minion logs:
.. code-block:: text
2017-02-01 01:24:40,728 [salt.module.logmod][ERROR ][3779] testing jinja logging
.. jinja_ref:: custom-execution-modules
Custom Execution Modules
========================
Custom execution modules can be used to supplement or replace complex Jinja. Many
tasks that require complex looping and logic are trivial when using Python
in a Salt execution module. Salt execution modules are easy to write and
distribute to Salt minions.
Functions in custom execution modules are available in the Salt execution
module dictionary just like the built-in execution modules:
.. code-block:: jinja
{{ salt['my_custom_module.my_custom_function']() }}
- :ref:`How to Convert Jinja Logic to an Execution Module <tutorial-jinja_to_execution-module>`
- :ref:`Writing Execution Modules <writing-execution-modules>`
.. jinja_ref:: custom-jinja-filters
Custom Jinja filters
====================
Given that all execution modules are available in the Jinja template,
one can easily define a custom module as in the previous paragraph
and use it as a Jinja filter.
However, please note that it will not be accessible through the pipe.
For example, instead of:
.. code-block:: jinja
{{ my_variable | my_jinja_filter }}
The user will need to define ``my_jinja_filter`` function under an extension
module, say ``my_filters`` and use as:
.. code-block:: jinja
{{ salt.my_filters.my_jinja_filter(my_variable) }}
The greatest benefit is that you are able to access thousands of existing functions, e.g.:
- get the DNS AAAA records for a specific address using the :mod:`dnsutil <salt.modules.dnsutil>`:
.. code-block:: jinja
{{ salt.dnsutil.AAAA('www.google.com') }}
- retrieve a specific field value from a :mod:`Redis <salt.modules.modredis>` hash:
.. code-block:: jinja
{{ salt.redis.hget('foo_hash', 'bar_field') }}
- get the routes to ``0.0.0.0/0`` using the :mod:`NAPALM route <salt.modules.napalm_route>`:
.. code-block:: jinja
{{ salt.route.show('0.0.0.0/0') }}
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