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Allow users to provide '## template: jinja' as the first line or their
#cloud-config or custom script user-data parts. When this header exists,
the cloud-config or script will be rendered as a jinja template.
All instance metadata keys and values present in
/run/cloud-init/instance-data.json will be available as jinja variables
for the template. This means any cloud-config module or script can
reference any standardized instance data in templates and scripts.
Additionally, any standardized instance-data.json keys scoped below a
'<v#>' key will be promoted as a top-level key for ease of reference in
templates. This means that '{{ local_hostname }}' is the same as using the
latest '{{ v#.local_hostname }}'.
Since instance-data is written to /run/cloud-init/instance-data.json, make
sure it is persisted across reboots when the cached datasource opject is
reloaded.
LP: #1791781
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This enables warnings produced by pylint for unused variables (W0612),
and fixes the existing errors.
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If a file passed to render_from_file had non-ascii text then
jinja in python2 would decode as ascii, which would cause
UnicodeDecodeError. This issue can be re-created in python2
with just:
'can\xe2\x80\x99t'.decode()
The solution here is to explicitly pass in unicode supporting
type (py3 str, py2 unicode). Those are six.text_type.
Then jinja does not try to decode.
The reason we hit this is that load_file calls decode_binary.
decode_binary believes it has no work to do if it got a six.string_types.
isinstance('can\xe2\x80\x99t', six.string_types) == True
So it returns the original string which will blow up for jinja.
Our fix here then is to load the file in binary mode and explicitly
decode it to utf-8. Then in python2 we'll have a unicode type
and in python3 we'll have a string type.
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This will change all instances of LOG.warn to LOG.warning as warn
is now a deprecated method. It will also make sure any logging
uses lazy logging by passing string format arguments as function
parameters.
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This has been a recurring ask and we had initially just made the change to
the cloud-init 2.0 codebase. As the current thinking is we'll just
continue to enhance the current codebase, its desirable to relicense to
match what we'd intended as part of the 2.0 plan here.
- put a brief description of license in LICENSE file
- put full license versions in LICENSE-GPLv3 and LICENSE-Apache2.0
- simplify the per-file header to reference LICENSE
- tox: ignore H102 (Apache License Header check)
Add license header to files that ship.
Reformat headers, make sure everything has vi: at end of file.
Non-shipping files do not need the copyright header,
but at the moment tests/ have it.
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In the absence of cheetah, which is a fairly heavy templating engine, and not
strictly needed by anything in cloud-init, the only warning we saw in the logs
was this one from the templater. Degrading this to a debug message makes
any other warnings more relevant.
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sources.list was where this showed itself, but all rendered files
would have their newline stripped.
LP: #1355343
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Mako is a python 2.6->3.x compatible
templating engine, allow its optional
usage (until we can depricate cheetah)
by allowing for specifying a template
file header that can define which template
engine to use.
For now support cheetah (the default) and
if specified support mako as well.
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At this point there is a mixture of "double hash" cheetah comments and '#*'
cheetah comments.
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importing, constant usage.
1. Move all datasources to a new sources directory
1. Rename some files to be more consistent with python file/module naming.
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