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5384258f4e
As mentioned in "Assumption:", current grep expression can't catch
font files whose names are changed from upstream "Noto CJK fonts".
To avoid false negatives, use command of the form:
fc-list : file family variable
, where ":" works as a wildcard pattern.
Variable fonts can be detected by filtering the output with
"variable=True" and "Noto CJK" font-family variants.
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/c62ba2e6-c124-4e91-8011-cb1da408a3c5@gmail.com
115 lines
4.7 KiB
Bash
Executable file
115 lines
4.7 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-only
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# Copyright (C) Akira Yokosawa, 2024
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#
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# For "make pdfdocs", reports of build errors of translations.pdf started
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# arriving early 2024 [1, 2]. It turned out that Fedora and openSUSE
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# tumbleweed have started deploying variable-font [3] format of "Noto CJK"
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# fonts [4, 5]. For PDF, a LaTeX package named xeCJK is used for CJK
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# (Chinese, Japanese, Korean) pages. xeCJK requires XeLaTeX/XeTeX, which
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# does not (and likely never will) understand variable fonts for historical
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# reasons.
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#
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# The build error happens even when both of variable- and non-variable-format
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# fonts are found on the build system. To make matters worse, Fedora enlists
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# variable "Noto CJK" fonts in the requirements of langpacks-ja, -ko, -zh_CN,
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# -zh_TW, etc. Hence developers who have interest in CJK pages are more
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# likely to encounter the build errors.
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#
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# This script is invoked from the error path of "make pdfdocs" and emits
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# suggestions if variable-font files of "Noto CJK" fonts are in the list of
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# fonts accessible from XeTeX.
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#
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# References:
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# [1]: https://lore.kernel.org/r/8734tqsrt7.fsf@meer.lwn.net/
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# [2]: https://lore.kernel.org/r/1708585803.600323099@f111.i.mail.ru/
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# [3]: https://en.wikipedia.org/wiki/Variable_font
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# [4]: https://fedoraproject.org/wiki/Changes/Noto_CJK_Variable_Fonts
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# [5]: https://build.opensuse.org/request/show/1157217
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#
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#===========================================================================
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# Workarounds for building translations.pdf
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#===========================================================================
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#
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# * Denylist "variable font" Noto CJK fonts.
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# - Create $HOME/deny-vf/fontconfig/fonts.conf from template below, with
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# tweaks if necessary. Remove leading "# ".
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# - Path of fontconfig/fonts.conf can be overridden by setting an env
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# variable FONTS_CONF_DENY_VF.
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#
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# * Template:
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# -----------------------------------------------------------------
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# <?xml version="1.0"?>
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# <!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
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# <fontconfig>
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# <!--
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# Ignore variable-font glob (not to break xetex)
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# -->
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# <selectfont>
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# <rejectfont>
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# <!--
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# for Fedora
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# -->
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# <glob>/usr/share/fonts/google-noto-*-cjk-vf-fonts</glob>
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# <!--
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# for openSUSE tumbleweed
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# -->
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# <glob>/usr/share/fonts/truetype/Noto*CJK*-VF.otf</glob>
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# </rejectfont>
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# </selectfont>
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# </fontconfig>
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# -----------------------------------------------------------------
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#
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# The denylisting is activated for "make pdfdocs".
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#
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# * For skipping CJK pages in PDF
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# - Uninstall texlive-xecjk.
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# Denylisting is not needed in this case.
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#
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# * For printing CJK pages in PDF
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# - Need non-variable "Noto CJK" fonts.
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# * Fedora
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# - google-noto-sans-cjk-fonts
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# - google-noto-serif-cjk-fonts
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# * openSUSE tumbleweed
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# - Non-variable "Noto CJK" fonts are not available as distro packages
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# as of April, 2024. Fetch a set of font files from upstream Noto
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# CJK Font released at:
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# https://github.com/notofonts/noto-cjk/tree/main/Sans#super-otc
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# and at:
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# https://github.com/notofonts/noto-cjk/tree/main/Serif#super-otc
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# , then uncompress and deploy them.
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# - Remember to update fontconfig cache by running fc-cache.
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#
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# !!! Caution !!!
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# Uninstalling "variable font" packages can be dangerous.
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# They might be depended upon by other packages important for your work.
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# Denylisting should be less invasive, as it is effective only while
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# XeLaTeX runs in "make pdfdocs".
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# Default per-user fontconfig path (overridden by env variable)
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: ${FONTS_CONF_DENY_VF:=$HOME/deny-vf}
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export XDG_CONFIG_HOME=${FONTS_CONF_DENY_VF}
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notocjkvffonts=`fc-list : file family variable | \
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grep 'variable=True' | \
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grep -E -e 'Noto (Sans|Sans Mono|Serif) CJK' | \
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sed -e 's/^/ /' -e 's/: Noto S.*$//' | sort | uniq`
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if [ "x$notocjkvffonts" != "x" ] ; then
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echo '============================================================================='
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echo 'XeTeX is confused by "variable font" files listed below:'
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echo "$notocjkvffonts"
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echo
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echo 'For CJK pages in PDF, they need to be hidden from XeTeX by denylisting.'
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echo 'Or, CJK pages can be skipped by uninstalling texlive-xecjk.'
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echo
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echo 'For more info on denylisting, other options, and variable font, see header'
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echo 'comments of scripts/check-variable-fonts.sh.'
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echo '============================================================================='
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fi
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# As this script is invoked from Makefile's error path, always error exit
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# regardless of whether any variable font is discovered or not.
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exit 1
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