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grub: save ang read default menu item

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If the ISO image has a FAT partition and the image is written
to a flash drive, then it is possible to write to this partition
of the flash drive.
This is necessary, for example, if the user
does not want to install the system, but wants to constantly work
in LiveCD mode with or without recording sessions.
In order for this code to work, you need to make changes
to the FAT partition of the image on the flash drive:
Add the 1st line to the grub.cfg file:
set pfxfat=${prefix}
Write a 1kb file grubenv.
If grub.cfg contains a line like '^default=id',
then the read value is not used.
This commit is contained in:
Dmitriy Terekhin 2021-05-19 15:55:44 +04:00
parent aed27a30f8
commit efec47fa42
7 changed files with 20 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
features.in/grub/cfg.in/00defaults.cfg
View File

@ -10,3 +10,15 @@ if [ "$grub_platform" = "efi" -a "$grub_cpu" = "x86_64" ]; then
fi
if [ "$grub_platform" = "pc" ]; then set linux_suffix='16'; fi
if [ ! "$lang" ]; then lang=@LOCALE@; fi
if [ -s $pfxfat/grubenv ]; then
load_env --file $pfxfat/grubenv
set default="${saved_entry}"
else
default=@default_id@
fi
function savedefault {
if [ -z "${boot_once}" -a -s $pfxfat/grubenv ]; then
saved_entry="${chosen}"
save_env --file $pfxfat/grubenv saved_entry
fi
}

2
features.in/grub/cfg.in/20install2.cfg
View File

@ -1,6 +1,4 @@
default='linux'
menuentry $"Install "'@distro@' --hotkey 'i' --id 'linux' {
echo $"Loading Linux vmlinuz$KFLAVOUR ..."
linux$linux_suffix /boot/vmlinuz$KFLAVOUR fastboot @initrd_bootargs@ @stagename@=altinst ramdisk_size=@altinst_size@ vga=@bootvga@ @bootargs@ $EFI_BOOTARGS lang=$lang

1
features.in/grub/cfg.in/30live.cfg
View File

@ -1,4 +1,5 @@
menuentry $"LiveCD (no hard disk needed)" --id 'live' {
savedefault
echo $"Loading Linux vmlinuz$KFLAVOUR ..."
linux$linux_suffix /boot/vmlinuz$KFLAVOUR fastboot live @initrd_bootargs@ @stagename@=live ramdisk_size=@live_size@ showopts lowmem vga=@bootvga@ @bootargs@ $EFI_BOOTARGS lang=$lang
echo $"Loading initial ramdisk ..."

1
features.in/grub/cfg.in/32live_rw.cfg
View File

@ -1,4 +1,5 @@
menuentry $"LiveCD with sessions support" --id 'session' {
savedefault
echo $"Loading Linux vmlinuz$KFLAVOUR ..."
linux$linux_suffix /boot/vmlinuz$KFLAVOUR fastboot live @initrd_bootargs@ @stagename@=live ramdisk_size=@live_size@ showopts live_rw vga=@bootvga@ @bootargs@ $EFI_BOOTARGS lang=$lang
echo $"Loading initial ramdisk ..."

1
features.in/grub/cfg.in/80rescue.cfg
View File

@ -1,4 +1,5 @@
menuentry $"Rescue LiveCD" --id 'rescue' {
savedefault
echo $"Loading Linux vmlinuz$KFLAVOUR ..."
linux$linux_suffix /boot/vmlinuz$KFLAVOUR changedisk fastboot live @initrd_bootargs@ @stagename@=rescue ramdisk_size=@rescue_size@ splash=0 showopts @rescue_bootargs@ $EFI_BOOTARGS
echo $"Loading initial ramdisk ..."

1
features.in/grub/cfg.in/82rescue_rw.cfg
View File

@ -1,4 +1,5 @@
menuentry $"Rescue with sessions support" --id 'rescue_session' {
savedefault
echo $"Loading Linux vmlinuz$KFLAVOUR ..."
linux$linux_suffix /boot/vmlinuz$KFLAVOUR changedisk fastboot live @initrd_bootargs@ @stagename@=rescue ramdisk_size=@rescue_size@ splash=0 showopts @rescue_bootargs@ $EFI_BOOTARGS live_rw
echo $"Loading initial ramdisk ..."

5
features.in/grub/stage1/scripts.d/01-grub
View File

@ -36,8 +36,11 @@ if [ -n "$GLOBAL_GRUB_DEFAULT" ]; then
exit 1
fi
fi
DEFAULT="$(grep -i '\-\-id ' "$CFG" | head -1 | rev| cut -f2 -d' ' |rev)"
if grep -i '@default_id@' "$CFG"; then
sed -i "s/@default_id@/$DEFAULT/" "$CFG"
fi
if ! grep -i '^\s*\(set\s\+\)\?default=' "$CFG"; then
DEFAULT="$(grep -i '\-\-id ' "$CFG" | head -1 | rev| cut -f2 -d' ' |rev)"
if [ -n "$DEFAULT" ]; then
echo "default=$DEFAULT" >> "$CFG"
else