Create an init process in Rust that can mount the initial file systems appropriately.

docker/Dockerfile.kernel

@@ -20,5 +20,5 @@ RUN dnf install -y \
 RUN mkdir -p /build/ramfs
 RUN curl https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-${KERNEL_VERSION}.tar.xz | tar xJC /build
 RUN mv /build/linux* /build/kernel
-COPY buildramfs.sh /build/ramfs/buildramfs.sh
 COPY lam.config /build/kernel/.config
+COPY buildramfs.sh  /build/ramfs/buildramfs.sh

docker/Dockerfile.rust

@@ -0,0 +1,12 @@
+FROM fedora:latest
+ENV USER=lam
+ENV PASS=lampass
+
+RUN useradd -m -G wheel -p ${PASS} ${USER}
+RUN dnf install -y \
+        clang \
+        gcc
+USER ${USER}
+WORKDIR /home/${USER}
+RUN mkdir -p /home/${USER}/lam
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain stable -t x86_64-unknown-linux-musl -y

docker/buildramfs.sh

@@ -1,40 +1,12 @@
 #!/bin/bash
  
-ARCH="x86_64"
-BB_VER="1.31.0"
- 
 # Dirs
-mkdir -p root
-cd root
-mkdir -p bin dev etc lib mnt proc sbin sys tmp var
+mkdir -p image/{bin,dev,etc,lib,mnt,proc,sbin,sys,tmp,var}
+cd image
+mkdir -p 
 cd -
  
-# Utils
-if [ ! -f "root/bin/busybox" ]; then
-    curl -L "https://www.busybox.net/downloads/binaries/${BB_VER}-defconfig-multiarch-musl/busybox-${ARCH}" >root/bin/busybox
-fi
-cd root/bin
-chmod +x busybox
-ln -s busybox mount
-ln -s busybox sh
-cd -
- 
-# Init process
- 
-cat >>root/init << EOF
-#!/bin/busybox sh
-/bin/busybox --install -s /bin
-mount -t devtmpfs  devtmpfs  /dev
-mount -t proc      proc      /proc
-mount -t sysfs     sysfs     /sys
-mount -t tmpfs     tmpfs     /tmp
-setsid cttyhack sh
-exec /bin/sh
-EOF
-chmod +x root/init
- 
 # initramfs creation
- 
-cd root
+cd image
 find . | cpio -ov --format=newc | gzip -9 >../initramfs
 cd -