Add initramfs-login

.gitignore

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+tftp/initramfs-login.img

Makefile

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+all: tftp/initramfs-login.img
+
+login/login: login/*.go
+	GOOS=linux GOARCH=amd64 go build -tags netgo -ldflags '-w -extldflags "-static -lncurses"' -o $@ ./login
+
+tftp/initramfs-login.img: initramfs-login login/login
+	mkdir -p $</{bin,sbin,etc,proc,sys} $</usr/share/udhcpc/
+	cp /bin/busybox $</bin
+	cp /usr/share/udhcpc/default.script $</usr/share/udhcpc/default.script
+	ln -sf busybox $</bin/sh
+	ln -sf busybox $</sbin/hotplug
+
+	mkdir -p $</etc/terminfo/l
+	cp /etc/terminfo/l/linux $</etc/terminfo/l/
+
+	cp login/login $</bin
+	cd $< && find . -print0 | cpio -H newc --null -o | xz --best --check=crc32 > ../$@

initramfs-login/etc/mdev.conf

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+$MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"

initramfs-login/init

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+#!/bin/sh
+
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+
+echo 0 > /proc/sys/kernel/printk
+
+busybox --install -s
+
+mknod /dev/null c 1 3
+mknod /dev/tty c 5 0
+
+mdev -s
+
+exec setsid sh -c 'exec sh /init2 </dev/tty1 >/dev/tty1 2>&1'

initramfs-login/init2

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+#!/bin/sh
+
+for mod in e100 e1000 e1000e 8139cp 8139too r8169 virtio-net; do
+    modprobe "${mod}"
+done
+
+ip link set eth0 up && udhcpc > /dev/null 2> /dev/null &
+
+/bin/login
+
+reboot -f