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#!/bin/sh
BUILD=/tmp/ramfs
OUT=${1-/boot/initramfs-linux.img}
# create base directory structure
printf "creating directories..."
[ -e $BUILD ] && rm -rf $BUILD
mkdir -p $BUILD/tmp
cd $BUILD
mkdir -p bin dev etc lib proc run sbin sys usr
mkdir -p lib/firmware lib/modules lib/udev
mkdir -p etc/modprobe.d etc/udev
ln -s lib lib64
ln -s ../bin usr/bin
ln -s ../sbin usr/sbin
printf "OK\n"
# copy binaries
printf "populating /bin..."
for b in dash cat cp dd killall kmod ln ls mkdir \
mknod mount rm sed sleep umount uname \
basename readlink printf echo udevadm; do
cp -a /bin/$b bin/
done
ln -s dash bin/sh
ln -s kmod bin/insmod
ln -s kmod bin/lsmod
printf "OK\n"
# create nodes for udev to mount
printf "creating nodes..."
mknod -m 600 dev/console c 5 1
mknod -m 666 dev/null c 1 3
printf "OK\n"
# Copy udev configuration
printf "configuring udev..."
cp /etc/udev/udev.conf etc/udev/
cp -r /etc/udev/rules.d etc/udev/
cp -r /lib/udev/* lib/udev/
printf "OK\n"
# set module order
touch etc/modprobe.d/modprobe.conf
# copy the init script
printf "installing init script..."
cp /sbin/initramfs-init sbin/init
printf "OK\n"
# copy required libraries
printf "populating /lib..."
for l in c acl attr blkid cap kmod lzma mount ncursesw readline z curses history zstd; do
cp /lib/lib$l.so lib/
done
ln -s libc.so /ld-musl-$(uname -m).so.1
printf "OK\n"
# copy any firmware
[ -d /lib/firmware ] && {
printf "installing firmware..."
cp -r /lib/firmware/* lib/firmware/
printf "OK\n"
}
# copy any modules
printf "installing modules..."
cp -r /lib/modules/* lib/modules/
printf "OK\n"
# create the initramfs image
printf "creating initramfs image..."
find ./ | cpio -o -H newc | gzip -9 > $OUT
printf "OK\n"
printf "Written initramfs image to $OUT\n"
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