manual: update for multiple global patch dirs
Updating the documentation to reflect that multiple directories can now be specified for BR2_GLOBAL_PATCH_DIR. Along with giving an example use case of how to use multiple global patch directories. [Thomas: fix minor typo mentionned by Thomas De Schampheleire.] Signed-off-by: Ryan Barnett <rjbarnet@rockwellcollins.com> Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com> Cc: Arnout Vandecappelle <arnout@mind.be> Reviewed-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Ryan Barnett
Thomas Petazzoni
parent
bc4f79d665
commit
b3a939367f
|
|
@ -8,16 +8,90 @@ It is sometimes useful to apply 'extra' patches to packages - over and
|
|||
above those provided in Buildroot. This might be used to support custom
|
||||
features in a project, for example, or when working on a new architecture.
|
||||
|
||||
The +BR2_GLOBAL_PATCH_DIR+ configuration file option can be
|
||||
used to specify a directory containing global package patches.
|
||||
The +BR2_GLOBAL_PATCH_DIR+ configuration option can be used to specify
|
||||
a space separated list of one or more directories containing package
|
||||
patches. By specifying multiple global patch directories, a user could
|
||||
implement a layered approach to patches. This could be useful when a
|
||||
user has multiple boards that share a common processor architecture.
|
||||
It is often the case that a subset of patches for a package need to be
|
||||
shared between the different boards a user has. However, each board
|
||||
may require specific patches for the package that build on top of the
|
||||
common subset of patches.
|
||||
|
||||
For a specific version <packageversion> of a specific package <packagename>,
|
||||
patches are applied as follows.
|
||||
For a specific version +<packageversion>+ of a specific package
|
||||
+<packagename>+, patches are applied from +BR2_GLOBAL_PATCH_DIR+ as
|
||||
follows:
|
||||
|
||||
First, the default Buildroot patch set for the package is applied.
|
||||
. For every directory - +<global-patch-dir>+ - that exists in
|
||||
+BR2_GLOBAL_PATCH_DIR+, a +<package-patch-dir>+ will be determined as
|
||||
follows:
|
||||
+
|
||||
* +<global-patch-dir>/<packagename>/<packageversion>/+ if the
|
||||
directory exists.
|
||||
+
|
||||
* Otherwise, +<global-patch-dir>/<packagename>+ if the directory
|
||||
exists.
|
||||
|
||||
If the directory +$(BR2_GLOBAL_PATCH_DIR)/<packagename>/<packageversion>+
|
||||
exists, then all +*.patch+ files in the directory will be applied.
|
||||
. Patches will then be applied from a +<package-patch-dir>+ as
|
||||
follows:
|
||||
+
|
||||
* If a +series+ file exists in the package directory, then patches are
|
||||
applied according to the +series+ file;
|
||||
+
|
||||
* Otherwise, patch files matching +<packagename>-*.patch+
|
||||
are applied in alphabetical order.
|
||||
So, to ensure they are applied in the right order, it is highly
|
||||
recommended to name the patch files like this:
|
||||
+<packagename>-<number>-<description>.patch+, where +<number>+
|
||||
refers to the 'apply order'.
|
||||
|
||||
Otherwise, if the directory +$(BR2_GLOBAL_PATCH_DIR)/<packagename>+
|
||||
exists, then all +*.patch+ files in the directory will be applied.
|
||||
For information about how patches are applied for a package, see
|
||||
xref:patch-apply-order[]
|
||||
|
||||
The +BR2_GLOBAL_PATCH_DIR+ option is the preferred method for
|
||||
specifying a custom patch directory for packages. It can be used to
|
||||
specify a patch directory for any package in buildroot. It should also
|
||||
be used in place of the custom patch directory options that are
|
||||
available for packages such as U-Boot and Barebox. By doing this, it
|
||||
will allow a user to manage their patches from one top-level
|
||||
directory.
|
||||
|
||||
The exception to +BR2_GLOBAL_PATCH_DIR+ being the preferred method for
|
||||
specifying custom patches is +BR2_LINUX_KERNEL_PATCH+.
|
||||
+BR2_LINUX_KERNEL_PATCH+ should be used to specify kernel patches that
|
||||
are available at an URL. *Note:* +BR2_LINUX_KERNEL_PATCHES+ are applied
|
||||
after patches available in +BR2_GLOBAL_PATCH_DIR+, as it is done
|
||||
from a post-patch hook of the Linux package.
|
||||
|
||||
An example directory structure for where a user has multiple
|
||||
directories specified for +BR2_GLOBAL_PATCH_DIR+ may look like this:
|
||||
|
||||
-----
|
||||
board/
|
||||
+-- common-fooarch
|
||||
| +-- patches
|
||||
| +-- linux
|
||||
| | +-- linux-patch1.patch
|
||||
| | +-- linux-patch2.patch
|
||||
| +-- u-boot
|
||||
| +-- foopkg
|
||||
+-- fooarch-board
|
||||
+-- patches
|
||||
+-- linux
|
||||
| +-- linux-patch3.patch
|
||||
+-- u-boot
|
||||
+-- foopkg
|
||||
-----
|
||||
|
||||
If the user has the +BR2_GLOBAL_PATCH_DIR+ configuration option set as
|
||||
follows:
|
||||
|
||||
-----
|
||||
BR2_GLOBAL_PATCH_DIR="board/common-fooarch board/fooarch-board"
|
||||
-----
|
||||
|
||||
Then the patches would applied as follows for the Linux kernel:
|
||||
|
||||
. board/common-fooarch/patches/linux/linux-patch1.patch
|
||||
. board/common-fooarch/patches/linux/linux-patch2.patch
|
||||
. board/fooarch-board/patches/linux/linux-patch3.patch
|
||||
|
|
|
|||
|
|
@ -50,10 +50,11 @@ Global patch directory
|
|||
^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
The +BR2_GLOBAL_PATCH_DIR+ configuration file option can be
|
||||
used to specify a directory containing global package patches. See
|
||||
xref:packages-custom[] for details.
|
||||
|
||||
used to specify a space separated list of one or more directories
|
||||
containing global package patches. See xref:packages-custom[] for
|
||||
details.
|
||||
|
||||
[[patch-apply-order]]
|
||||
How patches are applied
|
||||
~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
|
|
@ -64,19 +65,24 @@ How patches are applied
|
|||
. If +<packagename>_PATCH+ is defined, then patches from these
|
||||
tarballs are applied;
|
||||
|
||||
. If there are some +*.patch+ files in the package directory or in the
|
||||
a package subdirectory named +<packageversion>+, then:
|
||||
. If there are some +*.patch+ files in the package's Buildroot
|
||||
directory or in a package subdirectory named +<packageversion>+,
|
||||
then:
|
||||
+
|
||||
* If a +series+ file exists in the package directory, then patches are
|
||||
applied according to the +series+ file;
|
||||
+
|
||||
* Otherwise, patch files matching +<packagename>-*.patch+
|
||||
are applied in alphabetical order.
|
||||
So, to ensure they are applied in the right order, it is hightly
|
||||
recommended to named the patch files like this:
|
||||
So, to ensure they are applied in the right order, it is highly
|
||||
recommended to name the patch files like this:
|
||||
+<packagename>-<number>-<description>.patch+, where +<number>+
|
||||
refers to the 'apply order'.
|
||||
|
||||
. If +BR2_GLOBAL_PATCH_DIR+ is defined, the directories will be
|
||||
enumerated in the order they are specified. The patches are applied
|
||||
as described in the previous step.
|
||||
|
||||
. Run the +<packagename>_POST_PATCH_HOOKS+ commands if defined.
|
||||
|
||||
If something goes wrong in the steps _3_ or _4_, then the build fails.
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user