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equaeghe
l33t
Joined: 22 Feb 2005
Posts: 637
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 Posted: Mon Apr 15, 2024 8:24 am Post subject: systemd-boot+ukify:How to determine kernel boot label |
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| I am using systemd-boot and this weekend I've moved my kernel setup to one using UKIs generated using ukify (all works semi-automagically upon `make install` by setting the right use flags). However, the kernel boot label is now "Gentoo (2.14)". I would like it to be more informative, i.e., use just or at least include the kernel version string "x.y.z-gentoo-suffix", where 'suffix' is the extra string I set in the kernel itself. This version string is also used to identify the subfolder of /lib/modules where its modules are. Can I configure this and if so, where? |
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gabrielbo954
n00b
Joined: 12 Apr 2024
Posts: 2
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| Posted: Fri Apr 19, 2024 12:41 pm Post subject: |
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Sure, systemd-boot uses the entries in '/boot/loader/entries/' to define what kernels to boot and their labels. The labels are set in each entry file for your kernels.
If you're using UKIs with systemd-boot, your '/boot' might contain a '.conf' file for each kernel. You'd typically see a list of entries like 'title', 'linux', 'initrd', and 'options'.
Here's what you can do:
1. Navigate to the '/boot/loader/entries/' directory.
2. Open the '.conf' file corresponding to your kernel in a text editor.
3. Look for the 'title' line. It might look something like this:
| Code: | | title Gentoo (2.14) |
4. Change it to include your kernel version string like so:
| Code: | | title Gentoo x.y.z-gentoo-suffix |
Replace 'x.y.z-gentoo-suffix' with the actual version string of your kernel.
Save the file and reboot. systemd-boot should now display the new title in the boot menu.
If you want this process to be automated when you use 'make install', you would need to adjust your kernel's makefile or the script that handles the installations to modify this title for you. This could involve a simple 'sed' command to replace the title line in the '.conf' file with your desired label, including the dynamic version string fetched from your kernel build.
Here's an example of what that 'sed' command might look like:
| Code: | | sed -i 's|title.*|title Gentoo x.y.z-gentoo-suffix|' /boot/loader/entries/gentoo.conf |
Make sure to replace the 'gentoo.conf' with the actual name of your kernel's entry file and 'x.y.z-gentoo-suffix' with the command or variable that fetches your current kernel version string.
Remember to test any automated changes carefully to ensure they work as expected and don't disrupt your boot process. |
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AndrewAmmerlaan
Developer
Joined: 25 Jun 2014
Posts: 272
Location: Nijmegen
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| Posted: Fri Apr 19, 2024 9:18 pm Post subject: |
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The method described by the previous post will work, but let me add some more context.
The 2.14 system-boot reads from the os-release section of the UKI, ukify in turn adds this section based on the contents of /etc/os-release. This file is owned by the baselayout package (of which you have version 2.14 installed).
You can change it by either modifying VERSION_ID in /etc/os-release, or by instructing ukify to use a custom os-release file via /etc/kernel/uki.conf. Note though that you don't actually have to do this to distinguish between installed UKIs. As soon as systemd-boot finds two or more UKIs with the same os-release section it will also print the name of the file, containing the kernel version number, in the boot menu.
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