basic linux image

linux/Makefile

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+CHROOT_CMD := chroot build/rootfs /bin/bash -c
+ITDIR := build/rootfs/etc/initramfs-tools
+
+build/rootfs/initrd.img: build/rootfs initramfs/modules initramfs/download.sh
+	$(CHROOT_CMD) "apt update && apt install -y linux-image-4.19.0-6-amd64"
+	cp initramfs/download.sh $(ITDIR)/scripts/local-top
+	chmod +x $(ITDIR)/scripts/local-top/download.sh
+	cp initramfs/modules $(ITDIR)
+	$(CHROOT_CMD) "update-initramfs -c -kall"
+
+build/rootfs: build/cache
+	rm -r build/rootfs || true
+	cp -r build/cache build/rootfs
+
+build/cache:
+	rm -r build/cache || true
+	debootstrap buster build/cache
+
+clean:
+	rm -r build/rootfs

linux/Readme.md

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+# Linux for cloning
+Run `make` to build.

linux/initramfs/download.sh

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+#!/bin/sh
+. /scripts/functions
+configure_networking
+tftp -g -r root.squashfs 192.168.14.2
+mkdir /mnt
+modprobe loop
+losetup /dev/loop0
+losetup -r /dev/loop0 /root.squashfs

linux/initramfs/modules

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+squashfs