[Armbian build PR] - Add compatibility to package kernel-debs that use a localversion-X file

[RSS Bot]

Description

The current kernel.sh build system uses the grab_version() function in utils-compilation.sh to determine the version string of the kernel and locate the build artifacts after make has completed.

grab_version is a simple implementation that parses the makefile to guess the final kernel version, but if a userpatch has been applied to the kernel that includes a localversion-xx file (the PREEMPT_RT patch does this, for example), the returned value will be wrong (grab_version returns 5.10.110 when the true value used to name the vmlinuz image is 5.10.110-rt53-rockchip-rk3588)

Thank you to @rpardini on Discord for helping me identify a fix for this issue.

This patch switches kernel.sh to use the built in make kernelrelease command to return the kernel version, which takes into account any localversion-xx files in the kernel tree, as well as the LOCALVERSION=-${LINUXFAMILY} value appended by the armbian kernel-make.sh code.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• [x] Compile kernel on current HEAD with localversion-rt file present. Expected result: build failure Packaging fails at kernel_package_callback_linux_image() --> lib/functions/compilation/kernel-debs.sh:213 which is run_host_command_logged ls -la "${kernel_pre_package_path}" "${kernel_image_pre_package_path}" This fails because kernel_image_pre_package_path is derived from grab_version
• [x] Compile kernel with this patch and no localverison-rt files: vmlinuz filenames are unchanged from current functionality and correctly located by kernel-debs.sh to be built into .deb files. Output from run_host_command_logged ls -la "${kernel_pre_package_path}" "${kernel_image_pre_package_path}":

-rw-rw-r-- 1 root root   215715 May 10 19:33 config-5.10.110-rockchip-rk3588
-rw-rw-r-- 1 root root  7779350 May 10 19:33 System.map-5.10.110-rockchip-rk3588
-rw-rw-r-- 1 root root 34013696 May 10 19:33 vmlinuz-5.10.110-rockchip-rk3588

.deb creation is correct:

linux-image-legacy-rockchip-rk3588_23.05.0-trunk--5.10.110-Sad1f-D4008-Pbb66-Cc2a1Hfe66-HK01ba-Vc222-B049d_arm64.deb
linux-headers-legacy-rockchip-rk3588_23.05.0-trunk--5.10.110-Sad1f-D4008-Pbb66-Cc2a1Hfe66-HK01ba-Vc222-B049d_arm64.deb
linux-dtb-legacy-rockchip-rk3588_23.05.0-trunk--5.10.110-Sad1f-D4008-Pbb66-Cc2a1Hfe66-HK01ba-Vc222-B049d_arm64.deb

• [x] Compile kernel with this patch and localverison-rt files: vmlinuz files are correctly named with both the localversion-xx file and the armbian localversion appended in kernel-make.sh. Output from run_host_command_logged ls -la "${kernel_pre_package_path}" "${kernel_image_pre_package_path}":

-rw-rw-r-- 1 root root   210209 May 10 19:48 config-5.10.110-rt53-rockchip-rk3588
-rw-rw-r-- 1 root root  7777472 May 10 19:48 System.map-5.10.110-rt53-rockchip-rk3588
-rw-rw-r-- 1 root root 33714688 May 10 19:48 vmlinuz-5.10.110-rt53-rockchip-rk3588

.debs are created as expected:

linux-image-legacy-rockchip-rk3588_23.05.0-trunk--5.10.110-Scbae-D4008-Pbb66-C3f61Hfe66-HK01ba-Vc222-B049d_arm64.deb
linux-headers-legacy-rockchip-rk3588_23.05.0-trunk--5.10.110-Scbae-D4008-Pbb66-C3f61Hfe66-HK01ba-Vc222-B049d_arm64.deb
linux-dtb-legacy-rockchip-rk3588_23.05.0-trunk--5.10.110-Scbae-D4008-Pbb66-C3f61Hfe66-HK01ba-Vc222-B049d_arm64.deb

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules

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