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Romain Courteaud
slapos.recipe.template
Commits
776b21d6
Commit
776b21d6
authored
Jan 17, 2017
by
Vincent Pelletier
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recipe.template.jinja2: Add render-once support.
To be used for zope's inituser file, for example.
parent
dbb27169
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slapos/recipe/template/README.jinja2.txt
slapos/recipe/template/README.jinja2.txt
+62
-0
slapos/recipe/template/jinja2_template.py
slapos/recipe/template/jinja2_template.py
+6
-0
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slapos/recipe/template/README.jinja2.txt
View file @
776b21d6
...
...
@@ -116,6 +116,9 @@ Optional:
Mode, in octal representation (no need for 0-prefix) to set output file to.
This is applied before storing anything in output file.
``once``
Path of a marker file to prevents rendering altogether.
``extensions``
Jinja2 extensions to enable when rendering the template,
whitespace-separated. By default, none is loaded.
...
...
@@ -525,3 +528,62 @@ Let's just use ``buildout.cfg`` using this egg::
>>> cat('foo')
foobar
Avoiding file re-creation
~~~~~~~~~~~~~~~~~~~~~~~~~
Normally, each time the section is installed/updated the file gets
re-generated. This may be undesirable in some cases.
``once`` allows specifying a marker file, which when present prevents template
rendering.
>>> import os
>>> write('buildout.cfg',
... '''
... [buildout]
... parts = template
...
... [template]
... recipe = slapos.recipe.template:jinja2
... template = inline:dummy
... rendered = foo_once
... once = foo_flag
... ''')
>>> print system(join('bin', 'buildout')),
Uninstalling template.
Installing template.
Template was rendered::
>>> cat('foo_once')
dummy
And canary exists::
>>> os.path.exists('foo_flag')
True
Remove rendered file and re-render::
>>> import os
>>> os.unlink('foo_once')
>>> open('buildout.cfg', 'a').writelines(['extra = useless'])
>>> print system(join('bin', 'buildout')),
Uninstalling template.
Installing template.
Template was not rendered::
>>> os.path.exists('foo_once')
False
Removing the canary allows template to be re-rendered::
>>> os.unlink('foo_flag')
>>> open('buildout.cfg', 'a').writelines(['moreextra = still useless'])
>>> print system(join('bin', 'buildout')),
Uninstalling template.
Installing template.
>>> cat('foo_once')
dummy
slapos/recipe/template/jinja2_template.py
View file @
776b21d6
...
...
@@ -209,8 +209,11 @@ class Recipe(object):
self
.
template
=
env
.
template_class
.
from_code
(
env
,
env
.
compile
(
source
,
filename
=
template
),
env
.
make_globals
(
None
),
None
)
self
.
once
=
options
.
get
(
'once'
)
def
install
(
self
):
if
self
.
once
and
os
.
path
.
exists
(
self
.
once
):
return
# Unlink any existing file, so umask is always applied.
try
:
os
.
unlink
(
self
.
rendered
)
...
...
@@ -228,6 +231,9 @@ class Recipe(object):
self
.
mode
),
'w'
)
as
out
:
out
.
write
(
self
.
template
.
render
(
**
self
.
context
)
.
encode
(
self
.
encoding
))
if
self
.
once
:
open
(
self
.
once
,
'w'
).
close
()
return
return
self
.
rendered
update
=
install
...
...
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