kxtzownsu/PicoShim
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i hate loop0

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kxtzownsu 2025-01-08 10:50:40 -05:00
parent c1bfe8446a
commit 9438aff508
1 changed files with 18 additions and 4 deletions
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22
builder/picoshim.sh
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@ -21,7 +21,6 @@ ARCHITECTURE="$(uname -m)"
case "$ARCHITECTURE" in
*x86_64* | *x86-64*) ARCHITECTURE=x86_64 ;;
*aarch64* | *armv8*) ARCHITECTURE=aarch64 ;;
*i[3-6]86*) ARCHITECTURE=i386 ;;
*) fail "Unsupported architecture $ARCHITECTURE" ;;
esac
@ -36,7 +35,6 @@ SHIM="$1"
initramfs="/tmp/picoshim_initramfs"
rootfs_mnt="/tmp/picoshim_rootfsmnt"
state_mnt="/tmp/picoshim_statemnt"
loopdev=$(losetup -f)
CGPT="${SCRIPT_DIR}/bins/$ARCHITECTURE/cgpt"
SFDISK="${SCRIPT_DIR}/bins/$ARCHITECTURE/sfdisk"
@ -44,6 +42,8 @@ SFDISK="${SCRIPT_DIR}/bins/$ARCHITECTURE/sfdisk"
state_size="1"
rm -rf /tmp/kernel*
losetup -D
rm -rf $initramfs # cleanup previous instances of picoshim, if they existed.
mkdir -p $initramfs
@ -54,6 +54,17 @@ mkdir -p $rootfs_mnt
rm -rf $state_mnt # cleanup previous instances of picoshim, if they existed.
mkdir -p $state_mnt
rm -rf /tmp/loop0
# the amount of headaches loop0 has caused me....
if ! $(losetup | grep loop0); then
touch /tmp/loop0
dd if=/dev/urandom of=/tmp/loop0 bs=1 count=512 status=none > /dev/null 2>&1
losetup -P /dev/loop0 /tmp/loop0
fi
loopdev=$(losetup -f)
if [ -f "$SHIM" ]; then
shrink_partitions "$SHIM"
losetup -P "$loopdev" "$SHIM"
@ -63,13 +74,16 @@ fi
arch=$(detect_arch $loopdev)
extract_initramfs_full "$loopdev" "$initramfs" "/tmp/shim_kernel/kernel.img" "$arch"
dd if="${loopdev}p2" of=/tmp/kernel-new.bin bs=1M oflag=direct status=none
dd if="${loopdev}p2" of=/tmp/kernel-new.bin bs=1M status=none
# gets the initramfs size, e.g: 6.5M, and rounds it to the nearest whole number, e.g: 7M
# we're giving it 5 extra MBs to allow the busybox binaries to be installed & our bootstrapped stuff
initramfs_size=$(($(du -sb "$initramfs" | awk '{print $1}' | numfmt --to=iec | awk '{print int($1) + ($1 > int($1))}') + 3))
kernsize=$(($(fdisk -l ${loopdev}p2 | head -n 1 | awk '{printf $3}')))
kernsize=$(($(du -sb /tmp/kernel-new.bin | awk '{print $1}' | numfmt --to=iec | awk '{print int($1) + ($1 > int($1))}')))
# add another meg to the kernel just incase of resigning issues (:spoob:)
echo "fdisk!"
fdisk "$loopdev" <<EOF > /dev/null 2>&1
d
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