f1f97b3a05
It can be useful to have different configuration use the same post-build and/or post-image scripts as they share a common infrastructure, but yet have minor differentiation. This option allows passing zero or more additional arguments to each post-build or post-image script. The same set of extra arguments are passed to all scripts, it is not possible to pass different arguments to each script. [Peter: fix help text, post-image gets called with the images dir] Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
89 lines
4.7 KiB
Plaintext
89 lines
4.7 KiB
Plaintext
// -*- mode:doc; -*-
|
|
// vim: set syntax=asciidoc:
|
|
|
|
[[rootfs-custom]]
|
|
Customizing the generated target filesystem
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Besides changing one or another configuration through +make *config+,
|
|
there are a few ways to customize the resulting target filesystem.
|
|
|
|
* Customize the target filesystem directly and rebuild the image. The
|
|
target filesystem is available under +output/target/+. You can
|
|
simply make your changes here and run make afterwards - this will
|
|
rebuild the target filesystem image. This method allows you to do
|
|
anything to the target filesystem, but if you decide to completely
|
|
rebuild your toolchain and tools, these changes will be lost. This
|
|
solution is therefore only useful for quick tests only: _changes do
|
|
not survive the +make clean+ command_. Once you have validated your
|
|
changes, you should make sure that they will persist after a +make
|
|
clean+ by using one of the following methods.
|
|
|
|
* Create a filesystem overlay: a tree of files that are copied directly
|
|
over the target filesystem after it has been built. Set
|
|
+BR2_ROOTFS_OVERLAY+ to the top of the tree. +.git+, +.svn+, +.hg+
|
|
directories, +.empty+ files and files ending with +~+ are excluded.
|
|
_Among these first 3 methods, this one should be preferred_.
|
|
|
|
* In the Buildroot configuration, you can specify the paths to one or
|
|
more *post-build scripts*. These scripts are called in the given order,
|
|
'after' Buildroot builds all the selected software, but 'before' the
|
|
rootfs images are assembled. The +BR2_ROOTFS_POST_BUILD_SCRIPT+ allows
|
|
you to specify the location of your post-build scripts. This option can be
|
|
found in the +System configuration+ menu. The destination root
|
|
filesystem folder is given as the first argument to these scripts,
|
|
and these scripts can then be used to remove or modify any file in your
|
|
target filesystem. You should, however, use this feature with care.
|
|
Whenever you find that a certain package generates wrong or unneeded
|
|
files, you should fix that package rather than work around it with some
|
|
post-build cleanup scripts.
|
|
You may also use these variables in your post-build script:
|
|
- +BUILDROOT_CONFIG+: the path to the Buildroot .config file
|
|
- +HOST_DIR+, +STAGING_DIR+, +TARGET_DIR+: see
|
|
xref:generic-package-reference[]
|
|
- +BINARIES_DIR+: the place where all binary files (aka images) are
|
|
stored
|
|
- +BASE_DIR+: the base output directory
|
|
|
|
* Create your own 'target skeleton'. You can start with the default
|
|
skeleton available under +system/skeleton+ and then customize it to
|
|
suit your needs. The +BR2_ROOTFS_SKELETON_CUSTOM+ and
|
|
+BR2_ROOTFS_SKELETON_CUSTOM_PATH+ will allow you to specify the
|
|
location of your custom skeleton. These options can be found in the
|
|
+System configuration+ menu. At build time, the contents of the
|
|
skeleton are copied to output/target before any package
|
|
installation. Note that this method is *not recommended*, as it
|
|
duplicates the entire skeleton, which prevents from taking advantage
|
|
of the fixes or improvements brought to the default Buildroot
|
|
skeleton. The recommended method is to use the _post-build scripts_
|
|
mechanism described in the previous item.
|
|
|
|
Note also that you can use the *post-image scripts*
|
|
if you want to perform some specific actions 'after' all
|
|
filesystem images have been created (for example to automatically
|
|
extract your root filesystem tarball in a location exported by your
|
|
NFS server, or to create a special firmware image that bundles your
|
|
root filesystem and kernel image, or any other custom action), you can
|
|
specify a space-separated list of scripts in the
|
|
+BR2_ROOTFS_POST_IMAGE_SCRIPT+ configuration option. This option can be
|
|
found in the +System configuration+ menu as well.
|
|
|
|
Each of those scripts will be called with the path to the +images+
|
|
output directory as first argument, and will be executed with the main
|
|
Buildroot source directory as the current directory. Those scripts will
|
|
be executed as the user that executes Buildroot, which should normally
|
|
not be the root user. Therefore, any action requiring root permissions
|
|
in one of these _post-image scripts_ will require special handling
|
|
(usage of fakeroot or sudo), which is left to the script developer.
|
|
|
|
Just like for the _post-build scripts_ mentioned above, you also have
|
|
access to the following environment variables from your _post-image
|
|
scripts_: +BUILDROOT_CONFIG+, +HOST_DIR+, +STAGING_DIR+, +TARGET_DIR+,
|
|
+BINARIES_DIR+ and +BASE_DIR+.
|
|
|
|
Additionally, each of the +BR2_ROOTFS_POST_BUILD_SCRIPT+ and
|
|
+BR2_ROOTFS_POST_IMAGE_SCRIPT+ scripts will be passed the arguments
|
|
specified in +BR2_ROOTFS_POST_SCRIPT_ARGS+ (if that is not empty).
|
|
All the scripts will be passed the exact same set of arguments, it
|
|
is not possible to pass different sets of arguments to each script.
|