commit 45bcaa9172790390a4ac2b38575128ae6a39b0b9
Author: Benjamin Böhmke <benjamin@boehmke.net>
Date:   Sat Nov 2 14:41:03 2019 +0100

    initial version

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..16cb457
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,27 @@
+FROM alpine:3.10
+
+RUN apk update && \
+    apk add automake build-base git autoconf confuse-dev linux-headers \
+            findutils mtools e2fsprogs-extra alpine-sdk dosfstools && \
+    rm -rf /var/cache/apk/*
+
+RUN git clone https://github.com/pengutronix/genimage.git /tmp/genimage && \
+    cd /tmp/genimage && \
+    ./autogen.sh && \
+    ./configure CFLAGS='-g -O0' --prefix=/usr && \
+    make install && \
+    cd && \
+    rm -rf /tmp/genimage
+
+
+ADD ./resources/genext2fs /genext2fs
+
+RUN cd /genext2fs && \
+    abuild-keygen -a -i -q && \
+    abuild -F -P /tmp/pkg && \
+    apk add /tmp/pkg/x86_64/genext2fs-1*.apk && \
+    rm -rf /tmp/pkg/
+
+ADD ./resources /resources
+
+WORKDIR /work
diff --git a/resources/build.sh b/resources/build.sh
new file mode 100755
index 0000000..f6bac4c
--- /dev/null
+++ b/resources/build.sh
@@ -0,0 +1,283 @@
+ #!/bin/bash
+set -e
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+# User config
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+: ${ALPINE_BRANCH:="3.10"}
+: ${ALPINE_MIRROR:="http://dl-cdn.alpinelinux.org/alpine"}
+
+: ${TIME_ZONE:="Etc/UTC"}
+: ${HOST_NAME:="alpine"}
+: ${ROOT_PASSWORD:="alpine"}
+: ${IMG_NAME:="alpine-${ALPINE_BRANCH}-sdcard.img"}
+
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+# static config
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+RES_PATH=/resources/
+BASE_PACKAGES="alpine-base tzdata parted ifupdown e2fsprogs-extra util-linux coreutils linux-rpi2"
+
+WORK_PATH="/work"
+OUTPUT_PATH="/output"
+ROOTFS_PATH="${WORK_PATH}/root_fs"
+BOOTFS_PATH="${WORK_PATH}/boot_fs"
+DATAFS_PATH="${WORK_PATH}/data_fs"
+IMAGE_PATH="${WORK_PATH}/img"
+
+
+# ensure work directory is clean
+rm -rf ${WORK_PATH}/*
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+# functions
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+
+chroot_exec() {
+    chroot "${ROOTFS_PATH}" "$@" 1>&2
+}
+
+make_image() {
+    [ -d /tmp/genimage ] && rm -rf /tmp/genimage
+    genimage --rootpath $1 \
+      --tmppath /tmp/genimage \
+      --inputpath ${IMAGE_PATH} \
+      --outputpath ${IMAGE_PATH} \
+      --config $2
+}
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+# create root FS
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+
+echo ">> Prepare root FS"
+
+# update local repositories to destination ones to ensure the right packages where installed
+cat >/etc/apk/repositories <<EOF
+${ALPINE_MIRROR}/v${ALPINE_BRANCH}/main
+${ALPINE_MIRROR}/v${ALPINE_BRANCH}/community
+EOF
+
+# copy apk keys to new root (required for initial apk add run)
+mkdir -p ${ROOTFS_PATH}/etc/apk/keys/
+cp /usr/share/apk/keys/*.rsa.pub ${ROOTFS_PATH}/etc/apk/keys/
+
+# copy repositories to new root
+cp /etc/apk/repositories ${ROOTFS_PATH}/etc/apk/repositories
+
+# initial package installation
+apk --root ${ROOTFS_PATH} --update-cache --initdb --arch armhf add $BASE_PACKAGES
+
+# add google DNS to enable network access inside chroot
+echo "nameserver 8.8.8.8" > ${ROOTFS_PATH}/etc/resolv.conf
+
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+echo ">> Configure root FS"
+
+# set root password
+chroot_exec passwd << EOF
+${ROOT_PASSWORD}
+${ROOT_PASSWORD}
+EOF
+
+# Set time zone
+echo "${TIME_ZONE}" > ${ROOTFS_PATH}/etc/timezone
+chroot_exec ln -fs /usr/share/zoneinfo/${TIME_ZONE} /etc/localtime
+
+# Set host name
+chroot_exec rc-update add hostname default
+cat >${ROOTFS_PATH}/etc/hosts <<EOF
+127.0.0.1   localhost ${HOST_NAME}
+::1     localhost ${HOST_NAME}
+EOF
+cat >${ROOTFS_PATH}/etc/hostname <<EOF
+${HOST_NAME}
+EOF
+
+# enable local startup files (stored in /etc/local.d/)
+chroot_exec rc-update add local default
+cat >${ROOTFS_PATH}/etc/conf.d/local <<EOF
+rc_verbose=yes
+EOF
+
+# prepare network
+chroot_exec rc-update add networking default
+cat >${ROOTFS_PATH}/etc/network/interfaces <<EOF
+# interfaces(5) file used by ifup(8) and ifdown(8)
+# Include files from /etc/network/interfaces.d:
+source-directory /etc/network/interfaces.d
+
+auto lo
+iface lo inet loopback
+
+auto eth0
+iface eth0 inet dhcp
+EOF
+
+# networking should not wait for local -> local brings up the interface
+sed -i '/^\tneed/ s/$/ local/' ${ROOTFS_PATH}/etc/init.d/networking
+
+# bring up eth0 on startup
+cat >${ROOTFS_PATH}/etc/local.d/11-up_eth0.start <<EOF
+#!/bin/sh
+ifconfig eth0 up
+EOF
+chmod +x ${ROOTFS_PATH}/etc/local.d/11-up_eth0.start
+
+# make root file system writeable 
+cat >${ROOTFS_PATH}/etc/local.d/10-remount_root.start <<EOF
+#!/bin/sh
+mount -o remount,rw /
+EOF
+chmod +x ${ROOTFS_PATH}/etc/local.d/10-remount_root.start
+
+# add script to resize data partition 
+cp ${RES_PATH}/resizedata.sh ${ROOTFS_PATH}/etc/local.d/90-resizedata.start
+chmod +x ${ROOTFS_PATH}/etc/local.d/90-resizedata.start
+
+# mount data and boot partition (root is already mounted)
+cat >${ROOTFS_PATH}/etc/fstab <<EOF
+/dev/mmcblk0p1   /boot  vfat    defaults,ro    0       2
+/dev/mmcblk0p3   /data  ext4    defaults       0       1
+EOF
+
+# custom
+chroot_exec apk add dropbear
+chroot_exec rc-update add dropbear
+
+
+rm -rf ${ROOTFS_PATH}/var/cache/apk/*
+
+# TODO /etc/motd
+
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+# create boot FS
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+
+echo ">> Configure boot FS"
+
+# download base firmware
+mkdir -p ${BOOTFS_PATH}
+wget -P ${BOOTFS_PATH} https://github.com/raspberrypi/firmware/raw/master/boot/bootcode.bin
+wget -P ${BOOTFS_PATH} https://github.com/raspberrypi/firmware/raw/master/boot/fixup.dat
+wget -P ${BOOTFS_PATH} https://github.com/raspberrypi/firmware/raw/master/boot/fixup_cd.dat
+wget -P ${BOOTFS_PATH} https://github.com/raspberrypi/firmware/raw/master/boot/fixup_x.dat
+wget -P ${BOOTFS_PATH} https://github.com/raspberrypi/firmware/raw/master/boot/start.elf
+wget -P ${BOOTFS_PATH} https://github.com/raspberrypi/firmware/raw/master/boot/start_cd.elf
+wget -P ${BOOTFS_PATH} https://github.com/raspberrypi/firmware/raw/master/boot/start_x.elf
+
+# copy linux kernel and overlays
+cp ${ROOTFS_PATH}/usr/lib/linux-*-rpi2/*.dtb ${BOOTFS_PATH}/
+cp -r ${ROOTFS_PATH}/usr/lib/linux-*-rpi2/overlays ${BOOTFS_PATH}/
+cp ${ROOTFS_PATH}/boot/initramfs-rpi2 ${BOOTFS_PATH}/
+cp ${ROOTFS_PATH}/boot/vmlinuz-rpi2 ${BOOTFS_PATH}/
+
+# write boot config
+cat >${BOOTFS_PATH}/config.txt <<EOF
+disable_splash=1
+boot_delay=0
+
+gpu_mem=256
+gpu_mem_256=64
+
+hdmi_drive=1
+hdmi_group=2
+hdmi_mode=1
+hdmi_mode=87
+hdmi_cvt 800 480 60 6 0 0 0
+
+[pi2]
+kernel=vmlinuz-rpi2
+initramfs initramfs-rpi2
+
+[pi3]
+kernel=vmlinuz-rpi2
+initramfs initramfs-rpi2
+
+[all]
+include usercfg.txt
+
+EOF
+
+cat >${BOOTFS_PATH}/cmdline.txt <<EOF
+console=serial0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 fsck.repair=yes rw rootwait quiet
+
+EOF
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+# create data FS
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+
+echo ">> Configure data FS"
+mkdir -p ${DATAFS_PATH}
+
+
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+# create image
+# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
+
+echo ">> Create SD card image"
+
+# boot partition
+cat >${WORK_PATH}/genimage_boot.cfg <<EOF
+image boot.vfat {
+  name = "boot"
+  vfat {
+  }
+  size = 32M
+}
+EOF
+make_image ${BOOTFS_PATH} ${WORK_PATH}/genimage_boot.cfg
+
+# root partition
+cat >${WORK_PATH}/genimage_root.cfg <<EOF
+image rootfs.ext4 {
+  name = "root"
+  ext4 {
+  }
+  size = 150MB
+}
+EOF
+make_image ${ROOTFS_PATH} ${WORK_PATH}/genimage_root.cfg
+
+# data partition
+cat >${WORK_PATH}/genimage_data.cfg <<EOF
+image datafs.ext4 {
+  name = "data"
+  ext4 {
+  }
+  size = 20MB
+}
+EOF
+make_image ${DATAFS_PATH} ${WORK_PATH}/genimage_data.cfg
+
+# sd card image
+cat >${WORK_PATH}/genimage_sdcard.cfg <<EOF
+image sdcard.img {
+  hdimage {
+  }
+
+  partition boot {
+    partition-type = 0xC
+    bootable = "true"
+    image = "boot.vfat"
+  }
+
+  partition rootfs {
+    partition-type = 0x83
+    image = "rootfs.ext4"
+  }
+
+  partition datafs {
+    partition-type = 0x83
+    image = "datafs.ext4"
+  }
+}
+EOF
+make_image ${IMAGE_PATH} ${WORK_PATH}/genimage_sdcard.cfg
+
+# copy final image
+cp ${IMAGE_PATH}/sdcard.img ${OUTPUT_PATH}/${IMG_NAME}
diff --git a/resources/genext2fs/APKBUILD b/resources/genext2fs/APKBUILD
new file mode 100644
index 0000000..2341f9a
--- /dev/null
+++ b/resources/genext2fs/APKBUILD
@@ -0,0 +1,44 @@
+# Maintainer: Natanael Copa <ncopa@alpinelinux.org>
+pkgname=genext2fs
+pkgver=1.4.1
+pkgrel=0
+pkgdesc="Tool for generating an ext2 filesystem as non-root"
+url="http://genext2fs.sourceforge.net/"
+arch="all"
+license="GPLv2"
+depends=""
+depends_dev=""
+makedepends="$depends_dev"
+install=""
+subpackages="$pkgname-doc"
+source="http://downloads.sourceforge.net/project/genext2fs/genext2fs/$pkgver/genext2fs-$pkgver.tar.gz"
+_builddir="$srcdir"/genext2fs-$pkgver
+prepare() {
+	local i
+	cd "$_builddir"
+	for i in $source; do
+		case $i in
+		*.patch) msg $i; patch -p1 -i "$srcdir"/$i || return 1;;
+		esac
+	done
+}
+build() {
+	cd "$_builddir"
+	./configure \
+		--build=$CBUILD \
+		--host=$CHOST \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		--mandir=/usr/share/man \
+		--infodir=/usr/share/info \
+		--localstatedir=/var \
+		|| return 1
+	make || return 1
+}
+package() {
+	cd "$_builddir"
+	make DESTDIR="$pkgdir" install || return 1
+}
+md5sums="b7b6361bcce2cedff1ae437fadafe53b  genext2fs-1.4.1.tar.gz"
+sha256sums="404dbbfa7a86a6c3de8225c8da254d026b17fd288e05cec4df2cc7e1f4feecfc  genext2fs-1.4.1.tar.gz"
+sha512sums="1b9ec7044014423345ae6b09862ba6903f5b3e0f68fb8bbcf97daf2705471cc1633a9fdbc5e00afe1b191e1af7bed87bde2e538bc7365469218f2a00b062845c  genext2fs-1.4.1.tar.gz"
diff --git a/resources/resizedata.sh b/resources/resizedata.sh
new file mode 100755
index 0000000..a43544e
--- /dev/null
+++ b/resources/resizedata.sh
@@ -0,0 +1,63 @@
+#!/bin/sh -e
+logger -t "rc.resizedata" "Expanding root partition"
+
+# Detect root partition device
+ROOT_PART=$(mount | sed -n 's|^/dev/\(.*\) on / .*|\1|p')
+if [ -z "$ROOT_PART" ] ; then
+  log_warning_msg "unable to detect root partition device"
+  return 1
+fi
+
+# Extract root device name
+case "${ROOT_PART}" in
+  mmcblk0*) ROOT_DEV=mmcblk0 ;;
+  sda*)     ROOT_DEV=sda ;;
+esac
+
+# get last partition
+LAST_PART_NUM=$(parted /dev/${ROOT_DEV} -ms unit s p | tail -n 1 | cut -f 1 -d:)
+LAST_PART="${ROOT_DEV}p${LAST_PART_NUM}"
+
+
+# unmount if mounted
+if grep -qs "/dev/${LAST_PART}" /proc/mounts; then
+  umount /dev/${LAST_PART}
+fi
+
+# Get the starting offset of last partition
+PART_START=$(parted /dev/${ROOT_DEV} -ms unit s p | grep "^${LAST_PART_NUM}" | cut -f 2 -d: | sed 's/[^0-9]//g')
+if [ -z "$PART_START" ] ; then
+  logger -t "rc.resizedata" "${ROOT_DEV} unable to get starting sector of the partition"
+  return 1
+fi
+
+# Get the possible last sector for the root partition
+PART_LAST=$(fdisk -l /dev/${ROOT_DEV} | grep '^Disk.*sectors' | awk '{ print $7 - 1 }')
+if [ -z "$PART_LAST" ] ; then
+  logger -t "rc.resizedata" "${ROOT_DEV} unable to get last sector of the partition"
+  return 1
+fi
+
+### Since rc.local is run with "sh -e", let's add "|| true" to prevent premature exit
+echo "resize partition"
+fdisk /dev/${ROOT_DEV} > /dev/null <<EOF2 || true
+p
+d
+$LAST_PART_NUM
+n
+p
+$LAST_PART_NUM
+$PART_START
+$PART_LAST
+p
+w
+EOF2
+
+# Reload the partition table, resize root filesystem then remove resizing code from this file
+partprobe /dev/${ROOT_DEV} &&
+  resize2fs -p /dev/${LAST_PART} &&
+  logger -t "rc.resizedata" "Root partition successfully resized."
+
+mount -a
+
+rm -f /etc/local.d/90-resizedata.start
\ No newline at end of file