105 lines
2.9 KiB
Bash
105 lines
2.9 KiB
Bash
#!/usr/bin/env bash
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OS_NAME="Void Linux USB"
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GRUB_PREFIX="/boot/efi/LOADER/grub"
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CFG_CUSTOM_BEFORE="custom_before.cfg"
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CFG_CUSTOM_AFTER="custom_after.cfg"
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LINUX_CMDLINE="root=/dev/loop0 ro"
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DEFAULT_LINUX=/boot/vmlinu?
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if [ ! -f "$DEFAULT_LINUX" ]; then
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# in cases where it’s a .gz or .xz or whatever
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DEFAULT_LINUX=$(find /boot -type l -name "vmlinu*" 2>/dev/null | sort | head -n1)
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fi
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DEFAULT_LINUX="$(sed 's|^/boot/||' <<< "$DEFAULT_LINUX")"
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DEFAULT_INITRAMFS=/boot/initramfs.img
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if [ ! -f "$DEFAULT_INITRAMFS" ]; then
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# hope to find anything named initramfs or initrd
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DEFAULT_INITRAMFS=$(find /boot -type l -name "init*" 2>/dev/null | sort | head -n1)
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fi
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DEFAULT_INITRAMFS="$(sed 's|^/boot/||' <<< "$DEFAULT_INITRAMFS")"
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function make_menuentry {
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# $1 is the kernel path
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# We don’t want duplicate entries for /boot/vmlinuz symlink
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if [ -L "$1" ]; then
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return 0
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fi
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# exclude garbage globbing results
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if [ ! -f "$1" ]; then
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return 0
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fi
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LINUX="$(basename "$1")"
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LINUX_VERSION="$(sed 's/^kernel//;s/^vm//;s/^linuz//;s/^linux//;s/^-//' <<< "$LINUX")"
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if grep -e ".gz$" -e ".xz$" -e ".bz$" -e ".bz2$" -e ".lzma$" -e ".lz$" -e ".img$" >/dev/null 2>&1 <<< "$LINUX"; then
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LINUX_VERSION="$(sed 's/[^.]*$//;s/.$//' <<< "$LINUX_VERSION")"
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fi
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INITRAMFS="$(basename "$(find /boot -name "init*$LINUX_VERSION*" 2>/dev/null | sort | head -n1)")"
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# user output
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echo " -> Found $LINUX (version $LINUX_VERSION, initramfs $INITRAMFS)"
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# grub.cfg
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echo "
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menuentry 'Linux $LINUX_VERSION' {
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echo 'Loading $LINUX...'
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linux /$LINUX $LINUX_CMDLINE
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echo 'Loading initial ramdisk...'
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initrd /$INITRAMFS
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}" >> "$GRUB_PREFIX/grub.cfg"
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}
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# user output
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echo "Generating grub config..."
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# grub.cfg
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echo "# This file is auto-generated by $0.
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# Changes will be overwritten automatically.
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# If you want to add custom entries or other changes, add them to
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# $GRUB_PREFIX/$CFG_CUSTOM_BEFORE or
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# $GRUB_PREFIX/$CFG_CUSTOM_AFTER
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search --fs-uuid --set=root $(blkid --output value --match-tag UUID "$(grep " /boot " /proc/mounts | sed -e 's/ .*//')")
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set menu_color_normal=white/black
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set menu_color_highlight=black/light-gray
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timeout=5
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if [ -f \${config_directory}/$CFG_CUSTOM_BEFORE ]; then
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source \${config_directory}/$CFG_CUSTOM_BEFORE
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elif [ -z \"\${config_directory}\" -a -f \$prefix/$CFG_CUSTOM_BEFORE ]; then
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source \$prefix/$CFG_CUSTOM_BEFORE
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fi
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menuentry '$OS_NAME' {
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echo 'Loading Linux...'
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linux /$DEFAULT_LINUX
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echo 'Loading initial ramdisk...'
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initrd /$DEFAULT_INITRAMFS
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}
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submenu 'Choose kernel version...' {" > "$GRUB_PREFIX/grub.cfg"
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for FILE in /boot/{vm,}linu{x,z}* /boot/kernel*; do
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make_menuentry "$FILE"
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done
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# grub.cfg
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echo "
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}
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if [ -f \${config_directory}/$CFG_CUSTOM_AFTER ]; then
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source \${config_directory}/$CFG_CUSTOM_AFTER
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elif [ -z \"\${config_directory}\" -a -f \$prefix/$CFG_CUSTOM_AFTER ]; then
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source \$prefix/$CFG_CUSTOM_AFTER
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fi" >> "$GRUB_PREFIX/grub.cfg"
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# user output
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echo "done"
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