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In 6abe882bae1bb12827ef395c60f21ab8bb1bc61b the renderer was made to
unconditionally append a newline to output. This works, but is ugly. A nicer
solution is to tell jinja2 to not strip the newline in the first place, via
keep_trailing_newline=True. It seems that the result is unchanged because all
our source files have exactly one trailing newline.
Also, enable lstrip_blocks=True. This would cause whitespace on the line before
an {%if block to be automatically stripped. It seems reasonable to enable that
if trim_blocks=True.
Overall, no change is expected, though I didn't test combinations of
configurations, so there might be a change in some cases. But now the rules of
rendering are more logical, e.g. we should be able to indent nested conditional
statements without getting unexpected whitespace in the output.
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GIT_VERSION is not available as a config.h variable, because it's rendered
into version.h during builds. Let's rework jinja2 rendering to also
parse version.h. No functional change, the new variable is so far unused.
I guess this will make partial rebuilds a bit slower, but it's useful
to be able to use the full version string.
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I think this might be caused by trim_blocks=True. We were
missing the final newline everywhere.
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When using "capture : true" in custom_target()s the mode of the source
file is not preserved when the generated file is not installed and so
needs to be tweaked manually. Switch from output capture to creating the
target file and copy the permissions from the input file.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
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Imports are sorted in the usual fashion: stdlib first.
literal_eval() parses string/numbers/lists/sets/dicts, and nothing else, while
eval will execute any python code. Using literal_eval() is generally more
correct, because it avoids the risk of side effects from the parsed expression.
In this case, we generate the parsed strings ourselves, so it's very unlikely
to have anything unexpected in the expressions. But let's do the correct thing
anyway.
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https://spdx.dev/ids/#:~:text=Allowing%20later%20versions%20of%20a%20license
https://spdx.org/licenses/LGPL-2.1-or-later.html
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m4 was nice in '85, but the syntax feels a bit dated. Since we use python for
meson, let's use a popular python templating engine to replace some m4 usage.
A little nicety is that typos are caught:
FAILED: sysusers.d/systemd-remote.conf
/usr/bin/meson --internal exe --capture sysusers.d/systemd-remote.conf -- /home/zbyszek/src/systemd/tools/meson-render-jinja2.py config.h ../sysusers.d/systemd-remote.conf.j2
Traceback (most recent call last):
File "/home/zbyszek/src/systemd/tools/meson-render-jinja2.py", line 28, in <module>
print(render(sys.argv[2], defines))
File "/home/zbyszek/src/systemd/tools/meson-render-jinja2.py", line 24, in render
return template.render(defines)
File "/usr/lib/python3.9/site-packages/jinja2/environment.py", line 1090, in render
self.environment.handle_exception()
File "/usr/lib/python3.9/site-packages/jinja2/environment.py", line 832, in handle_exception
reraise(*rewrite_traceback_stack(source=source))
File "/usr/lib/python3.9/site-packages/jinja2/_compat.py", line 28, in reraise
raise value.with_traceback(tb)
File "<template>", line 8, in top-level template code
jinja2.exceptions.UndefinedError: 'HAVE_MICROHTTP' is undefined
This checking mirrors what 349cc4a507c4d84fcadf61f42159ea6412717896 did for C defines.
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