Package: grub-common Version: 2.02~beta2-11
Severity: wishlist I (and apparently a number of others, see e.g. http://askubuntu.com/questions/216398/set-older-kernel-as-default-grub-entry) found myself needing to change the Linux kernel version GRUB sets as default. The process is rather clunky and error-prone; you have to figure out where in the GRUB menu it will appear, then enter that in /etc/default/grub, and if the menu position changes due to new kernels added to the system you have to do it all over again. I had older kernels with a distinctive local version naming scheme that I wanted preferred over the stock kernels, but it could also be used to specify a particular kernel version. Testing: Kernels that do not have the substring from GRUB_LINUX_PREF_VERSION_SUBSTR should be ordered below kernels that do. The group of kernels with the substring should be sorted by version, as should kernels without. Specify GRUB_LINUX_PREF_VERSION_SUBSTR=foo in /etc/default/grub and run update-grub. Patch against git c5b76152c1f9d0cdb999e27a82ea520ab5c4faa4 to implement change follows: --- diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in index ccce9e5..d31f65c 100644 --- a/util/grub-mkconfig.in +++ b/util/grub-mkconfig.in @@ -242,7 +242,8 @@ export GRUB_DEFAULT \ GRUB_OS_PROBER_SKIP_LIST \ GRUB_DISABLE_SUBMENU \ GRUB_RECORDFAIL_TIMEOUT \ - GRUB_RECOVERY_TITLE + GRUB_RECOVERY_TITLE \ + GRUB_LINUX_PREF_VERSION_SUBSTR if test "x${grub_cfg}" != "x"; then rm -f "${grub_cfg}.new" diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in index 79fa03a..74b26b6 100644 --- a/util/grub.d/10_linux.in +++ b/util/grub.d/10_linux.in @@ -269,13 +269,28 @@ EOF # yet, so it's empty. In a submenu it will be equal to '\t' (one tab). submenu_indentation="" +pref_list="" +non_pref_list="" +for entry in $list; do + if [[ "$entry" == *$GRUB_LINUX_PREF_VERSION_SUBSTR* ]]; then + pref_list="$pref_list $entry" + else + non_pref_list="$non_pref_list $entry" + fi +done + is_top_level=true -while [ "x$list" != "x" ] ; do - linux=`version_find_latest $list` +while [ "x$pref_list$non_pref_list" != "x" ] ; do + if [ "x$pref_list" != "x" ]; then + linux=`version_find_latest $pref_list` + pref_list=`echo $pref_list | tr ' ' '\n' | fgrep -vx "$linux" | tr '\n' ' '` + else + linux=`version_find_latest $non_pref_list` + non_pref_list=`echo $non_pref_list | tr ' ' '\n' | fgrep -vx "$linux" | tr '\n' ' '` + fi case $linux in *.efi.signed) # We handle these in linux_entry. - list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr '\n' ' '` continue ;; esac