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#!/bin/bash
if [[ ! -e /usr/bin/extlinux ]]
then
echo "syslinux is not installed: nothing to do."
exit 1
fi
mklinuxpba-initramfs
kernel_release="$(uname -r)"
case "${kernel_release##*-}" in
"ARCH")
kernel_image="vmlinuz-linux"
;;
"lts")
kernel_image="vmlinuz-linux-lts"
;;
*)
echo "The currenly running kernel is not supported."
exit 1
;;
esac
linux_size=$(stat --printf="%s" /boot/$kernel_image)
pba_size=$(stat --printf="%s" /boot/linuxpba.img)
fallback_pba_size=$(stat --printf="%s" /boot/linuxpba-fallback.img)
if [[ -e /boot/intel-ucode.img ]]
then
intelucode_size=$(stat --printf="%s" /boot/intel-ucode.img)
else
intelucode_size=0
fi
diskimg_size=$(( (linux_size+pba_size+intelucode_size)/1024+3072 ))
fallback_diskimg_size=$(( (linux_size+fallback_pba_size+intelucode_size)/1024+3072 ))
mkdir -p "/tmp/linuxpba/mnt"
pushd "/tmp/linuxpba/"
cp /usr/lib/syslinux/bios/mbr.bin linuxpba.diskimg
truncate -s "${diskimg_size}k" linuxpba.diskimg
echo -e "8,,,*\nwrite" | sfdisk linuxpba.diskimg
loopdev="$(losetup --show -f -o 4096 linuxpba.diskimg)"
sync
mkfs.ext4 -L linuxpba "$loopdev"
mount "$loopdev" mnt
extlinux -i mnt
if [[ -e /boot/intel-ucode.img ]]
then
cp /boot/intel-ucode.img mnt
cp /etc/linuxpba/extlinux.conf mnt
else
sed 's/intel-ucode.img,//' /etc/linuxpba/extlinux.conf > mnt/extlinux.conf
fi
cp /boot/linuxpba.img mnt
cp /boot/$kernel_image mnt
umount mnt
losetup -d "$loopdev"
cp /usr/lib/syslinux/bios/mbr.bin linuxpba-fallback.diskimg
truncate -s "${fallback_diskimg_size}k" linuxpba-fallback.diskimg
echo -e "8,,,*\nwrite" | sfdisk linuxpba-fallback.diskimg
loopdev="$(losetup --show -f -o 4096 linuxpba-fallback.diskimg)"
sync
mkfs.ext4 -L linuxpba "$loopdev"
mount "$loopdev" mnt
extlinux -i mnt
if [[ -e /boot/intel-ucode.img ]]
then
cp /boot/intel-ucode.img mnt
cp /etc/linuxpba/extlinux.conf mnt
else
sed 's/intel-ucode.img,//' /etc/linuxpba/extlinux.conf > mnt/extlinux.conf
fi
cp /boot/linuxpba-fallback.img mnt/linuxpba.img
cp /boot/$kernel_image mnt
umount mnt
losetup -d "$loopdev"
mv linuxpba.diskimg linuxpba-fallback.diskimg /boot
cd /tmp
rmdir -p linuxpba/mnt
popd
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