linux-kernel - Re: [PATCH V2] kbuild: rpm-pkg: add dtb files in kernel rpm

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Date: Fri, 15 Mar 2024 12:00:21 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
Cc: masahiroy@...nel.org, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, nicolas@...sle.eu
Subject: Re: [PATCH V2] kbuild: rpm-pkg: add dtb files in kernel rpm

On Mon, Mar 11, 2024 at 05:22:38PM +0100, Jose Ignacio Tornos Martinez wrote:
> Some architectures, like aarch64 ones, need a dtb file to configure the
> hardware. The default dtb file can be preloaded from u-boot, but the final
> and/or more complete dtb file needs to be able to be loaded later from
> rootfs.
> 
> Add the possible dtb files to the kernel rpm and mimic Fedora shipping
> process, storing the dtb files in the module directory. These dtb files
> will be copied to /boot directory by the install scripts, but add fallback
> just in case, checking if the content in /boot directory is correct.
> 
> Mark the files installed to /boot as %ghost to make sure they will be
> removed when the package is uninstalled.
> 
> Tested with Fedora Rawhide (x86_64 and aarch64) with dnf and rpm tools.
> In addition, fallback was also tested after modifying the install scripts.
> 
> Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>

Tested-by: Nathan Chancellor <nathan@...nel.org>

I can see the new files in my arm64 package using 'rpm -qf'.

> ---
> V1 -> V2:
> - Follow the suggestions from Masahiro Yamada to improve the checks and
> avoid the loop to ghost the dtb files in /boot folder.
> 
>  scripts/package/kernel.spec | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/scripts/package/kernel.spec b/scripts/package/kernel.spec
> index c256b73cca3e..e095eb1e290e 100644
> --- a/scripts/package/kernel.spec
> +++ b/scripts/package/kernel.spec
> @@ -61,6 +61,9 @@ cp $(%{make} %{makeflags} -s image_name) %{buildroot}/lib/modules/%{KERNELRELEAS
>  %{make} %{makeflags} INSTALL_HDR_PATH=%{buildroot}/usr headers_install
>  cp System.map %{buildroot}/lib/modules/%{KERNELRELEASE}
>  cp .config %{buildroot}/lib/modules/%{KERNELRELEASE}/config
> +if %{make} %{makeflags} run-command KBUILD_RUN_COMMAND='test -d ${srctree}/arch/${SRCARCH}/boot/dts' 2>/dev/null; then
> +	%{make} %{makeflags} INSTALL_DTBS_PATH=%{buildroot}/lib/modules/%{KERNELRELEASE}/dtb dtbs_install
> +fi
>  ln -fns /usr/src/kernels/%{KERNELRELEASE} %{buildroot}/lib/modules/%{KERNELRELEASE}/build
>  %if %{with_devel}
>  %{make} %{makeflags} run-command KBUILD_RUN_COMMAND='${srctree}/scripts/package/install-extmod-build %{buildroot}/usr/src/kernels/%{KERNELRELEASE}'
> @@ -81,6 +84,11 @@ ln -fns /usr/src/kernels/%{KERNELRELEASE} %{buildroot}/lib/modules/%{KERNELRELEA
>  		echo "%ghost /boot/${x}-%{KERNELRELEASE}"
>  	done
>  
> +	if [ -d "%{buildroot}/lib/modules/%{KERNELRELEASE}/dtb" ];then
> +		echo "/lib/modules/%{KERNELRELEASE}/dtb"
> +		find "%{buildroot}/lib/modules/%{KERNELRELEASE}/dtb" -printf "%%%ghost /boot/dtb-%{KERNELRELEASE}/%%P\n"
> +	fi
> +
>  	echo "%exclude /lib/modules/%{KERNELRELEASE}/build"
>  } > %{buildroot}/kernel.list
>  
> @@ -96,6 +104,11 @@ for file in vmlinuz System.map config; do
>  		cp "/lib/modules/%{KERNELRELEASE}/${file}" "/boot/${file}-%{KERNELRELEASE}"
>  	fi
>  done
> +if [ -d "/lib/modules/%{KERNELRELEASE}/dtb" ] && \
> +   ! diff -rq "/lib/modules/%{KERNELRELEASE}/dtb" "/boot/dtb-%{KERNELRELEASE}" >/dev/null 2>&1; then
> +	rm -rf "/boot/dtb-%{KERNELRELEASE}"
> +	cp -r "/lib/modules/%{KERNELRELEASE}/dtb" "/boot/dtb-%{KERNELRELEASE}"
> +fi
>  if [ ! -e "/lib/modules/%{KERNELRELEASE}/modules.dep" ]; then
>  	/usr/sbin/depmod %{KERNELRELEASE}
>  fi
> -- 
> 2.44.0
>