Add myinitramfs

3 files changed, 168 insertions, 0 deletions

diff --git a/sys-boot/myinitramfs/files/init b/sys-boot/myinitramfs/files/init
new file mode 100755
index 0000000..3cd6ce9
--- /dev/null
+++ b/sys-boot/myinitramfs/files/init
@@ -0,0 +1,93 @@
+#!/bin/busybox sh
+# vim:ft=sh
+
+# Init must have pid 1 otherwise switch_root won't work.
+if [ $$ -ne 1 ]; then
+	echo "init must have pid 1!"
+	exit 1
+fi
+
+# Predefice colors
+C_NO="\e[0m"
+C_GRAY="\e[1;30m"
+C_RED="\e[1;31m"
+C_GREEN="\e[1;32m"
+C_YELLOW="\e[1;33m"
+
+PATH="$PATH:/bin:/sbin"
+
+# disable kernel message from terminal and clear screen
+echo 0 > /proc/sys/kernel/printk
+clear
+
+# TODO print some welcome ascii art :-)
+
+# Function called if we fail. Argument is error message.
+fail() {
+	echo -e "${C_RED}$@${C_NO}"
+	echo -e "${C_YELLOW}Dropping to interactive shell${C_NO}"
+	busybox --install -s
+	while true; do
+		echo -e "${C_GRAY}Mount root to /mnt/root and exit shell to switch root.${C_NO}"
+		# Note this is hack to enable job control
+		setsid sh -c 'exec sh </dev/tty1 >/dev/tty1 2>&1'
+		echo
+		exec switch_root /mnt/root /sbin/init || echo -e "${C_RED}Root switch failed!${C_NO}"
+	done
+}
+
+# Preliminary mounts
+busybox mount -t proc none /proc || fail "/proc mount failed!"
+busybox mount -t sysfs none /sys || fail "/sys mount failed!"
+busybox mount -t devtmpfs none /dev || fail "/dev mount failed!"
+
+# Now open and mount root
+root=""
+rootflags=""
+
+for opt in $(cat /proc/cmdline); do
+	case "$opt" in
+		root=*)
+			root=${opt:5}
+			;;
+		rootflags=*)
+			rootflags=${opt:10}
+			;;
+		BOOT_IMAGE=*|initrd=*)
+			# Ignore those
+			;;
+		*)
+			echo -e "${C_YELLOW}Unknown kernel argument: $opt${C_NO}"
+			;;
+	esac
+done
+
+[ -z "$root" ] && fail "Missing root argument!"
+
+echo -ne "${C_GRAY}Waiting for root ($root)..."
+CNT=10
+while [ ! -e "$root" ] && [ $CNT -gt 0 ]; do
+	CNT=$(expr $CNT - 1)
+	sleep 1
+	echo -n " $CNT"
+done
+echo -e "${C_NO}"
+[ -e "$root" ] || fail "Root not located!"
+
+# TODO mount boot parition and look for key saved there (on unlock remove it)
+
+echo -e "${C_GREEN}Unlocking root...${C_NO}"
+cryptsetup open "$root" encroot || fail "Unlocking root failed! /proc/cmdline=$(cat /proc/cmdline)"
+
+echo -e "${C_GREEN}Mounting root...${C_NO}"
+mount -t btrfs -o "$rootflags" /dev/mapper/encroot /mnt/root \
+	|| fail "Mounting root failed! /proc/cmdline=$(cat /proc/cmdline)"
+
+
+echo -e "${C_GREEN}Switching to real root${C_NO}"
+
+# First clean up. The init process will remount proc, sys and dev later on
+busybox umount /dev /sys /proc || fail "Unmouns failed!"
+
+# Now do switch
+exec switch_root /mnt/root /sbin/init || fail "Root switch failed!"
diff --git a/sys-boot/myinitramfs/files/list b/sys-boot/myinitramfs/files/list
new file mode 100644
index 0000000..9645521
--- /dev/null
+++ b/sys-boot/myinitramfs/files/list
@@ -0,0 +1,35 @@
+# Dirs
+dir /bin	755 0 0
+dir /dev	755 0 0
+dir /etc	755 0 0
+dir /lib	755 0 0
+dir /lib64	755 0 0
+dir /mnt	755 0 0
+dir /mnt/root	755 0 0
+dir /proc	755 0 0
+dir /root	755 0 0
+dir /sbin	755 0 0
+dir /sys	755 0 0
+
+# Binaries
+file /bin/busybox	/bin/busybox	755 0 0
+file /sbin/cryptsetup	/sbin/cryptsetup	755 0 0
+file /sbin/btrfs	/sbin/btrfs	755 0 0
+
+# Ld
+file /lib64/ld-linux-x86-64.so.2	/lib64/ld-linux-x86-64.so.2	755 0 0
+# Libraries
+file /lib64/libblkid.so.1	/lib64/libblkid.so.1	755 0 0
+file /lib64/libc.so.6	/lib64/libc.so.6	755 0 0
+file /lib64/libdevmapper.so.1.02	/lib64/libdevmapper.so.1.02	755 0 0
+file /lib64/liblzo2.so.2	/lib64/liblzo2.so.2	755 0 0
+file /lib64/libm.so.6	/lib64/libm.so.6	755 0 0
+file /lib64/libpthread.so.0	/lib64/libpthread.so.0	755 0 0
+file /lib64/librt.so.1	/lib64/librt.so.1	755 0 0
+file /lib64/libudev.so.1	/lib64/libudev.so.1	755 0 0
+file /lib64/libuuid.so.1	/lib64/libuuid.so.1	755 0 0
+file /lib64/libz.so.1	/lib64/libz.so.1	755 0 0
+file /lib64/libcryptsetup.so.4	/usr/lib64/libcryptsetup.so.4	755 0 0
+file /lib64/libgcrypt.so.20	/usr/lib64/libgcrypt.so.20	755 0 0
+file /lib64/libgpg-error.so.0	/usr/lib64/libgpg-error.so.0	755 0 0
+file /lib64/libpopt.so.0	/usr/lib64/libpopt.so.0	755 0 0
diff --git a/sys-boot/myinitramfs/myinitramfs-1.0.ebuild b/sys-boot/myinitramfs/myinitramfs-1.0.ebuild
new file mode 100644
index 0000000..9e8e999
--- /dev/null
+++ b/sys-boot/myinitramfs/myinitramfs-1.0.ebuild
@@ -0,0 +1,40 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+# TODO support encrytion and btrfs only as option
+
+EAPI=6
+
+DESCRIPTION="My personal initramfs (verry simple with encryption support)"
+HOMEPAGE=""
+SRC_URI=""
+
+LICENSE="GPLv2"
+SLOT="0"
+KEYWORDS="amd64 x86"
+IUSE=""
+
+DEPEND="sys-fs/cryptsetup
+sys-fs/btrfs-progs
+sys-apps/linux-misc-apps
+sys-apps/busybox[static]"
+RDEPEND="${DEPENDS}"
+
+src_unpack() {
+	# Well we have no sources so just create empty directory
+	mkdir -p "${S}"
+}
+
+src_compile() {
+	# TODO generate list dynamically
+	cp "${FILESDIR}"/list list
+	echo "file /init ${FILESDIR}/init 755 0 0" >> list
+	gen_init_cpio list > initramfs.cpio
+	gzip initramfs.cpio
+}
+
+src_install() {
+	dodir /boot
+	insinto /boot
+	newins initramfs.cpio.gz initramfs-gentoo
+}