From 3b8ad1593a12bef4e3e2d9ab240b0fba16093199 Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Sat, 1 Jan 2011 23:00:49 +0100
Subject: initial version

---
 .gitignore  |   4 ++++
 Makefile    |  62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 bin/sh      |   1 +
 dev/vc/0    |   1 +
 etc/kmap-de | Bin 0 -> 2823 bytes
 init        |  47 +++++++++++++++++++++++++++++++++++++++++++++
 root/.keep  |   0
 7 files changed, 115 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 120000 bin/sh
 create mode 120000 dev/vc/0
 create mode 100644 etc/kmap-de
 create mode 100755 init
 create mode 100644 root/.keep

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3c19e1c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.root-done
+initramfs
+initramfs.cpio
+root/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b17e9a7
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,62 @@
+CONTENT=/sbin/lvm /sbin/vgchange /sbin/vgscan /bin/busybox init /dev/console etc/kmap-de
+CONTENT-LINKS=bin/sh
+CONTENT-MARKER=$(addprefix .root-done/,$(CONTENT))
+DATE=$(shell date +%F_%T)
+
+all:	initramfs
+
+initramfs:	initramfs.cpio
+	gzip > initramfs < initramfs.cpio
+
+initramfs.cpio:	.root-done/.complete
+	cd root ;\
+	find . | cpio -H newc -o > ../initramfs.cpio
+
+.root-done/.complete:	$(CONTENT-MARKER) .root-done/.links
+	touch .root-done/.complete
+
+$(CONTENT-MARKER): .root-done/%: %
+	-ldd $* | cut -d" " -f 3 | while read i ; do \
+		if [ -n "$$i" ]; then \
+			mkdir -p $$(dirname $$i) ;\
+			cp --parents $$i root/ ;\
+		fi ;\
+	done
+
+	-ldd $* | grep -v "=>" | cut -f1 -d" " | while read i ; do \
+		if [ -n "$$i" ]; then \
+			mkdir -p $$(dirname $$i) ;\
+			cp --parents $$i root/ ;\
+		fi ;\
+ 	done
+
+	mkdir -p $(shell dirname $*) 
+	cp -a --parents $* root/
+
+	mkdir -p $(dir .root-done/$*)
+	touch .root-done/$*
+
+.root-done/.links:	Makefile
+	for i in $(CONTENT-LINKS) ; do \
+		mkdir -p $$(dirname $$i) ;\
+		cp -a --parents $$i root/ ;\
+	done
+
+	touch .root-done/.static
+
+$(CONTENT-MARKER): Makefile
+
+clean:
+	${RM} initramfs initramfs.cpio
+	${RM} -r root/*
+	${RM} -r .root-done/
+
+install:
+	if [ ! -d "/boot/grub" ]; then \
+		mount /boot ;\
+	fi
+
+	if [ -r /boot/initramfs ]; then \
+		mv /boot/initramfs /boot/initramfs-$(DATE) ;\
+	fi
+	cp initramfs /boot/initramfs
diff --git a/bin/sh b/bin/sh
new file mode 120000
index 0000000..c3fa810
--- /dev/null
+++ b/bin/sh
@@ -0,0 +1 @@
+busybox
\ No newline at end of file
diff --git a/dev/vc/0 b/dev/vc/0
new file mode 120000
index 0000000..bea71cc
--- /dev/null
+++ b/dev/vc/0
@@ -0,0 +1 @@
+../console
\ No newline at end of file
diff --git a/etc/kmap-de b/etc/kmap-de
new file mode 100644
index 0000000..bdef348
Binary files /dev/null and b/etc/kmap-de differ
diff --git a/init b/init
new file mode 100755
index 0000000..1bbb6df
--- /dev/null
+++ b/init
@@ -0,0 +1,47 @@
+#!/bin/sh
+
+# make dirs
+/bin/busybox mkdir -p /dev /proc /sys /newroot
+
+# mount needed filesystems
+mount -t proc none /proc
+mount -t sysfs none /sys
+
+busybox --install -s
+mdev -s
+
+# lvm stuff
+vgscan
+vgchange -a y lvm
+
+# process command line options
+init="/sbin/init"
+root="/dev/lvm/root"
+
+CMDLINE=$(cat /proc/cmdline)
+
+for i in ${CMDLINE}; do
+	case $i in
+		root\=*)
+			root=$(echo "$i" | cut -d "=" -f 2)
+			;;
+		init\=*)
+			init=$(echo "$i" | cut -d "=" -f 2)
+			;;
+	esac
+done
+
+# switch to new root or fallback to sh
+mount -r ${root} /newroot
+if [ -x "/newroot/${init}" ]; then
+	umount /sys
+	umount /proc
+	exec /bin/busybox switch_root /newroot ${init} ${CMDLINE}
+else
+	echo "Something went wrong..."
+	echo "After fixing it you may want to execute:"
+	echo "exec /bin/busybox switch_root /newroot ${init} ${CMDLINE}"
+
+	loadkmap < /etc/kmap-de
+	exec /bin/sh
+fi
diff --git a/root/.keep b/root/.keep
new file mode 100644
index 0000000..e69de29
-- 
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