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86a415df8a
Asciidoc supports two syntaxes for section titles: two-line titles (title
plus underline consisting of a particular symbol), and one-line titles
(title prefixed with a specific number of = signs).
The two-line title underlines are:
Level 0 (top level): ======================
Level 1: ----------------------
Level 2: ~~~~~~~~~~~~~~~~~~~~~~
Level 3: ^^^^^^^^^^^^^^^^^^^^^^
Level 4 (bottom level): ++++++++++++++++++++++
and the one-line title prefixes:
= Document Title (level 0) =
== Section title (level 1) ==
=== Section title (level 2) ===
==== Section title (level 3) ====
===== Section title (level 4) =====
The buildroot manual is currenly using the two-line titles, but this has
multiple disadvantages:
- asciidoc also uses some of the underline symbols for other purposes (like
preformatted code, example blocks, ...), which makes it difficult to do
mass replacements, such as a planned follow-up patch that needs to move
all sections one level down.
- it is difficult to remember which level a given underline symbol (=-~^+)
corresponds to, while counting = signs is easy.
This patch changes all two-level titles to one-level titles in the manual.
The bulk of the change was done with the following Python script, except for
the level 1 titles (-----) as these underlines are also used for literal
code blocks.
This patch only changes the titles, no other changes. In
adding-packages-directory.txt, I did add missing newlines between some
titles and their content.
----------------------------------------------------------------------------
#!/usr/bin/env python
import sys
import mmap
import re
for input in sys.argv[1:]:
f = open(input, 'r+')
f.flush()
s = mmap.mmap(f.fileno(), 0)
# Level 0 (top level): ====================== =
# Level 1: ---------------------- ==
# Level 2: ~~~~~~~~~~~~~~~~~~~~~~ ===
# Level 3: ^^^^^^^^^^^^^^^^^^^^^^ ====
# Level 4 (bottom level): ++++++++++++++++++++++ =====
def replace_title(s, symbol, replacement):
pattern = re.compile(r'(.+\n)\%s{2,}\n' % symbol, re.MULTILINE)
return pattern.sub(r'%s \1' % replacement, s)
new = s
new = replace_title(new, '=', '=')
new = replace_title(new, '+', '=====')
new = replace_title(new, '^', '====')
new = replace_title(new, '~', '===')
#new = replace_title(new, '-', '==')
s.seek(0)
s.write(new)
s.resize(s.tell())
s.close()
f.close()
----------------------------------------------------------------------------
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
135 lines
4.7 KiB
Plaintext
135 lines
4.7 KiB
Plaintext
// -*- mode:doc -*- ;
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[[outside-br-custom]]
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=== Keeping customizations outside Buildroot
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The Buildroot community recommends and encourages upstreaming to the
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official Buildroot version the packages and board support that are
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written by developers. However, it is sometimes not possible or
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desirable because some of these packages or board support are highly
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specific or proprietary.
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In this case, Buildroot users are offered two choices:
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* They can add their packages, board support and configuration files
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directly within the Buildroot tree, and maintain them by using
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branches in a version control system.
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* They can use the +BR2_EXTERNAL+ mechanism, which allows to keep
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package recipes, board support and configuration files outside of
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the Buildroot tree, while still having them nicely integrated in
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the build logic. The following paragraphs give details on how to
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use +BR2_EXTERNAL+.
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+BR2_EXTERNAL+ is an environment variable that can be used to point to
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a directory that contains Buildroot customizations. It can be passed
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to any Buildroot +make+ invocation. It is automatically saved in the
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hidden +.br-external+ file in the output directory. By doing this,
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there is no need to pass +BR2_EXTERNAL+ at every +make+ invocation. It
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can however be changed at any time by passing a new value, and can be
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removed by passing an empty value.
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*Note:* the +BR2_EXTERNAL+ path can be either an absolute or a relative path,
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but if it's passed as a relative path, it is important to note that it
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is interpreted relative to the main Buildroot source directory, *not*
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the Buildroot output directory.
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Some examples:
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-----
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buildroot/ $ make BR2_EXTERNAL=/path/to/foobar menuconfig
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-----
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Starting from now on, external definitions from the +/path/to/foobar+
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directory will be used:
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-----
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buildroot/ $ make
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buildroot/ $ make legal-info
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-----
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We can switch to another external definitions directory at any time:
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-----
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buildroot/ $ make BR2_EXTERNAL=/where/we/have/barfoo xconfig
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-----
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Or disable the usage of external definitions:
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-----
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buildroot/ $ make BR2_EXTERNAL= xconfig
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-----
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+BR2_EXTERNAL+ then allows three different things:
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* One can store all the board-specific configuration files there,
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such as the kernel configuration, the root filesystem overlay, or
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any other configuration file for which Buildroot allows to set its
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location. The +BR2_EXTERNAL+ value is available within the
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Buildroot configuration using +$(BR2_EXTERNAL)+. As an example, one
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could set the +BR2_ROOTFS_OVERLAY+ Buildroot option to
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+$(BR2_EXTERNAL)/board/<boardname>/overlay/+ (to specify a root
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filesystem overlay), or the +BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE+
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Buildroot option to
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+$(BR2_EXTERNAL)/board/<boardname>/kernel.config+ (to specify the
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location of the kernel configuration file). To achieve this, it is
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recommended but not mandatory, to store those details in
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directories called +board/<boardname>/+ under +BR2_EXTERNAL+. This
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matches the directory structure used within Buildroot.
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* One can store package recipes (i.e. +Config.in+ and
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+<packagename>.mk+), or even custom configuration options and make
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logic. Buildroot automatically includes +BR2_EXTERNAL/Config.in+ to
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make it appear in the top-level configuration menu, and includes
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+BR2_EXTERNAL/external.mk+ with the rest of the makefile logic.
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Providing those two files is mandatory, but they can be empty.
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+
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The main usage of this is to store package recipes. The recommended
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way to do this is to write a +BR2_EXTERNAL/Config.in+ that looks
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like:
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+
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------
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source "$BR2_EXTERNAL/package/package1/Config.in"
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source "$BR2_EXTERNAL/package/package2/Config.in"
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------
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+
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Then, have a +BR2_EXTERNAL/external.mk+ file that looks like:
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+
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------
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include $(sort $(wildcard $(BR2_EXTERNAL)/package/*/*.mk))
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------
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+
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And then in +BR2_EXTERNAL/package/package1+ and
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+BR2_EXTERNAL/package/package2+ create normal Buildroot package
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recipes, as explained in xref:adding-packages[].
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* One can store Buildroot defconfigs in the +configs+ subdirectory of
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+BR2_EXTERNAL+. Buildroot will automatically show them in the
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output of +make help+ and allow them to be loaded with the normal
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+make <name>_defconfig+ command. They will be visible under the
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+User-provided configs:+' label in the 'make help' output.
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In the end, a typical +BR2_EXTERNAL+ directory organization would
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generally be:
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-----
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$(BR2_EXTERNAL)/
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+-- Config.in
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+-- external.mk
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+-- board/
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| +-- <boardname>/
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| +-- linux.config
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| +-- overlay/
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| +-- etc/
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| +-- <some file>
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+-- configs/
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| +-- <boardname>_defconfig
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+-- package/
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+-- package1/
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| +-- Config.in
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| +-- package1.mk
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+-- package2/
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+-- Config.in
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+-- package2.mk
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------
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