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#!/usr/bin/env bash
# -*- coding: utf-8 -*-
type emergency_shell >/dev/null 2>&1 || source /lib/dracut-lib.sh
# Needed to be able to go back to dracut at system shutdown.
# only do this if there is enough space in /run since systemd decided to limit
# some tmpfs to 10% of the memory size breaking the system with low memory...
# See: https://github.com/systemd/systemd/commit/b67ec8e5b2e1a74d7e9a3a2b3ac60b7b2e39d4ea
_run_size_kb="$(slx-tools fs_path_space /run | cut -d' ' -f2)"
_initrd_block_size="$( stat -f / -c%S)"
_initrd_total_blocks="$(stat -f / -c%b)"
_initrd_free_blocks="$(stat -f / -c%a)"
_initrd_used_blocks="$(( _initrd_total_blocks - _initrd_free_blocks ))"
_initrd_size_kb="$(( ( _initrd_used_blocks * _initrd_block_size ) / 1024 ))"
if [ "$(( _run_size_kb - _initrd_size_kb ))" -ge "200000" ]; then
# more than 200MB space, should be safe to copy initramfs over
temporary_directory_path="$(mktemp --directory)"
mount --options bind / "$temporary_directory_path"
cp --recursive --no-target-directory "$temporary_directory_path" /run/initramfs
umount "$temporary_directory_path"
rm --dir "$temporary_directory_path"
fi
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