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A user may wish to use an image that is not sorted as the "latest" version as the top-level entry. For example, in Arch Linux, if a user has the LTS and regular kernels installed, "/boot/vmlinuz-linux-lts" gets sorted as the "latest" compared to "/boot/vmlinuz-linux", meaning the LTS kernel becomes the top-level entry. However, a user may wish to use the regular kernel as the top-level default with the LTS only existing as a backup. This need can be seen in Arch Linux's AUR with two user-submitted packages[0][1] providing an update hook which patches /etc/grub.d/10_linux to move the desired kernel to the top-level. This patch serves to solve this in a more generic way. Introduce the GRUB_TOP_LEVEL, GRUB_TOP_LEVEL_XEN and GRUB_TOP_LEVEL_OS_PROBER variables to allow users to specify the top-level entry. Create grub_move_to_front() as a helper function which moves entries to the front of a list. This function does the heavy lifting of moving the menu entry to the front in each script. In 10_netbsd, since there isn't an explicit list variable, extract the items that are being iterated through into a list so that we can optionally apply grub_move_to_front() to the list before the loop. [0]: https://aur.archlinux.org/packages/grub-linux-default-hook [1]: https://aur.archlinux.org/packages/grub-linux-rt-default-hook Signed-off-by: Denton Liu <liu.denton@gmail.com> Reviewed-by: Oskari Pirhonen <xxc3ncoredxx@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'