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Sourcing a file with an absolute path and using rsource in it triggered
a relpath() between the absolute path and $srctree. Since e.g.
symlink/../bar/ = bar/ is not guaranteed for symlinks, this could lead
to the rsource'd file not being found if $srctree pointed to a symlink.
Switch to a simpler, more textual method for stripping $srctree from
glob results, which should be robust against symlink shenanigans. This
also makes the code a bit easier to follow.
Discovered by Marc Herbert.
Piggyback some minor cleanup.
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'gsource' works like 'source', but takes a glob pattern and sources all
matching files. Works as a no-op if no files match, and hence doubles as
an include-if-exists function, similar to '-include' in 'make'.
Add a 'grsource' statement as well, mirroring 'rsource'.
Came up in https://github.com/ulfalizer/Kconfiglib/pull/40.
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The 'rsource' statement works like 'source', but looks relative to the
Kconfig file that has the 'rsource' rather than relative to the base
Kconfig file. Using 'rsource' makes it possible to move subtrees with
Kconfig files around without breaking references to other Kconfig files.
So far, this is a Kconfiglib-exclusive feature.
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Previously, $srctree/path/to/defconfig would be looked up before
/path/to/defconfig, and the code wouldn't check if /path/to/defconfig
was an absolute path ($srctree is ignored otherwise). Sloppy old
oversights. The behavior now fully matches the C implementation.
Also fix some related things:
- An 'if m' suffices to select a defconfig. We previously required 'y'.
- Make the code less hacky and possibly more Windows-friendly by using
os.path.relpath() to de-absolutize paths, and stop using
os.path.normpath() as it could change the meaning of paths that
contain symbolic links.
- Explain what happens if 'option defconfig_list' is set on multiple
symbols and print a warning in that case.
- Fix get_srctree(). It would previously return "." instead of None if
$srctree was unset at parse time. Somehow forgot to to test this. The
code is now much more straightforward.
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