[Buildroot] [PATCH v3 1/7] package/Makefile.in: expose CONFIG_DIR to post-build/post-image scripts

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2021-05-04 22:51 +0200, Thomas Petazzoni spake thusly:
> Sometimes, post-build or post-image scripts need to reinvoke
> Buildroot's make, for example to execute "make printvars".
> 
> However, so far none of the variables exposed to post-build/post-image
> scripts allowed to do that in a way that worked for both in-tree and
> out-of-tree builds. Indeed:

As we discussed on IRC, there is in fact one possibility to do that:

    make -C ${BR2_CONFIG%/*} printvars

Indeed, BR2_CONFIG points to the full path of the .config file, so by
removing the last path component of BR2_CONFIG, we end up with the
directory that is CONFIG_DIR.

However, it is not ver convenient to extract info from Br2_CONFIG, so
exposing CONFIG_DIR is a godd adition.

Applied to master, after referencing BR2_CONFIG, thanks.

Regards,
Yann E. MORIN.

>  * "make printvars" would work for in-tree builds, but not out of tree
>    builds
> 
>  * "make -C ${O} printvars" would work for out-of-tree builds, but not
>    in-tree builds
> 
> In order to solve this, this commit exposes $(CONFIG_DIR) to
> post-build/post-image scripts, through the EXTRA_ENV variable.
> 
> The documentation is updated accordingly.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> ---
>  docs/manual/customize-post-image.txt | 3 ++-
>  docs/manual/customize-rootfs.txt     | 3 +++
>  package/Makefile.in                  | 1 +
>  3 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/docs/manual/customize-post-image.txt b/docs/manual/customize-post-image.txt
> index 90ea2b9328..5308093d06 100644
> --- a/docs/manual/customize-post-image.txt
> +++ b/docs/manual/customize-post-image.txt
> @@ -28,7 +28,8 @@ different sets of arguments to each script.
>  
>  Again just like for the post-build scripts, the scripts have access to
>  the environment variables +BR2_CONFIG+, +HOST_DIR+, +STAGING_DIR+,
> -+TARGET_DIR+, +BUILD_DIR+, +BINARIES_DIR+ and +BASE_DIR+.
> ++TARGET_DIR+, +BUILD_DIR+, +BINARIES_DIR+, +CONFIG_DIR+ and
> ++BASE_DIR+.
>  
>  The post-image scripts will be executed as the user that executes
>  Buildroot, which should normally _not_ be the root user. Therefore, any
> diff --git a/docs/manual/customize-rootfs.txt b/docs/manual/customize-rootfs.txt
> index e1dbadda5b..8b361f8621 100644
> --- a/docs/manual/customize-rootfs.txt
> +++ b/docs/manual/customize-rootfs.txt
> @@ -65,6 +65,9 @@ In addition, you may also use these environment variables:
>    - +BUILD_DIR+: the directory where packages are extracted and built
>    - +BINARIES_DIR+: the place where all binary files (aka images) are
>      stored
> +  - +CONFIG_DIR+: the directory containing the .config file, and
> +    therefore the top-level Buildroot Makefile to use (which is
> +    correct for both in-tree and out-of-tree builds)
>    - +BASE_DIR+: the base output directory
>  
>  Below three more methods of customizing the target filesystem are
> diff --git a/package/Makefile.in b/package/Makefile.in
> index 51f5cbce4f..f4028bc67c 100644
> --- a/package/Makefile.in
> +++ b/package/Makefile.in
> @@ -318,6 +318,7 @@ EXTRA_ENV = \
>  	PATH=$(BR_PATH) \
>  	BR2_DL_DIR=$(BR2_DL_DIR) \
>  	BUILD_DIR=$(BUILD_DIR) \
> +	CONFIG_DIR=$(CONFIG_DIR) \
>  	O=$(CANONICAL_O)
>  
>  ################################################################################
> -- 
> 2.30.2
> 
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 561 099 427 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'