From ced9aa0de94a9e8eeb0502b03bf29bedab126c8b Mon Sep 17 00:00:00 2001
From: Andreas Grapentin <andreas@grapentin.org>
Date: Thu, 28 Dec 2017 16:09:01 +0100
Subject: [PATCH] producing parabola images now

---
 .gitignore    |  7 ++++
 create.sh     | 66 +++++++++-------------------------
 src/stage0.sh |  7 ++++
 src/stage1.sh | 65 ++++++++++++++++++++++++++++++++++
 src/stage2.sh | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++
 start.sh      | 50 +++++++++++++++++++++-----
 6 files changed, 235 insertions(+), 58 deletions(-)
 create mode 100755 src/stage0.sh
 create mode 100755 src/stage1.sh
 create mode 100755 src/stage2.sh

diff --git a/.gitignore b/.gitignore
index ef6b600..13cd0d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,13 @@
 # image files
 *.qcow2
 *.raw
+*.img
 
 # tarballs
 *.tar.*
+
+# build dirs
+build/
+
+# generated ssh keys
+keys/*
diff --git a/create.sh b/create.sh
index e509b86..d1f811b 100755
--- a/create.sh
+++ b/create.sh
@@ -2,63 +2,29 @@
 
 set -eu
 
-# this script prepares an archlinuxarm image for use with start.sh
+# this script prepares an armv7h parabola image for use with start.sh
 
-OUTFILE=${OUTFILE:-armv7h.raw}
-SIZE=${SIZE:-64G}
-
-_builddir=build
-_outfile=$_builddir/$(basename $OUTFILE)
+export OUTFILE=${OUTFILE:-armv7h.img}
+export SIZE=${SIZE:-64G}
+export ARCHTARBALL=${ARCHTARBALL:-ArchLinuxARM-armv7-latest.tar.gz}
 
+export _builddir=build
 mkdir -p $_builddir
 
-# create an empty image
-rm -f $_outfile
-qemu-img create -f raw $_outfile $SIZE
+export _outfile=$_builddir/$(basename $OUTFILE)
 
-# setup an available loop device
-_loopdev=$(losetup -f --show $_outfile)
+# prepare the empty image
+./src/stage0.sh
 
-# setup an error exit handler for cleanup
-function cleanup {
-  echo "exiting due to earlier errors..." >&2
-  for part in p1 p2; do
-    umount $_loopdev$part || true
-  done
-  losetup -d $_loopdev || true
-  rm -rf $_builddir/boot $_builddir/root
-  rm -f $_outfile
-}
-trap cleanup ERR
+# install archlinuxarm in the empty image
+./src/stage1.sh
 
-# fetch latest archlinuxarm tarball
-wget -nc http://os.archlinuxarm.org/os/ArchLinuxARM-armv7-latest.tar.gz
+# migrate the installed image to parabola
+./src/stage2.sh
 
-# following are the installation instructions provided on
-# https://archlinuxarm.org/platforms/armv7/arm/versatile-express
-dd if=/dev/zero of=$_loopdev bs=1M count=8
-parted -s $_loopdev \
-  mklabel gpt \
-  mkpart ESP fat32 1MiB 513MiB \
-  set 1 boot on \
-  mkpart primary ext4 513MiB 100%
-mkfs.vfat -F 32 ${_loopdev}p1
-mkdir -p $_builddir/boot
-mount ${_loopdev}p1 $_builddir/boot
-mkfs.ext4 ${_loopdev}p2
-mkdir $_builddir/root
-mount ${_loopdev}p2 $_builddir/root
-bsdtar -vxpf ArchLinuxARM-armv7-latest.tar.gz -C $_builddir/root
-sync
-mv -v $_builddir/root/boot/* $_builddir/boot
-cat >> $_builddir/root/etc/fstab << EOF
-/dev/mmcblk0p1  /boot   vfat    defaults        0       0
-EOF
-
-# tie up any loose ends
-for part in p1 p2; do
-  umount $_loopdev$part
-done
-losetup -d $_loopdev
+# cleanup
+chown $(logname) $_outfile
 mv -v $_outfile $OUTFILE
 rm -rf $_builddir
+
+echo "all done :)"
diff --git a/src/stage0.sh b/src/stage0.sh
new file mode 100755
index 0000000..970e4a6
--- /dev/null
+++ b/src/stage0.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -eu
+
+# create an empty qemu image
+rm -f $_outfile
+qemu-img create -f raw $_outfile $SIZE
diff --git a/src/stage1.sh b/src/stage1.sh
new file mode 100755
index 0000000..e106288
--- /dev/null
+++ b/src/stage1.sh
@@ -0,0 +1,65 @@
+#!/bin/bash
+
+set -eu
+
+# setup an available loop device
+_loopdev=$(losetup -f --show $_outfile)
+
+# setup an error exit handler for cleanup
+function cleanup {
+  echo "exiting due to earlier errors..." >&2
+  for part in p1 p2; do
+    umount $_loopdev$part || true
+  done
+  losetup -d $_loopdev || true
+  rm -rf $_builddir/boot $_builddir/root
+  rm -f $_outfile
+}
+trap cleanup ERR
+
+# fetch latest archlinuxarm tarball
+wget -nc http://os.archlinuxarm.org/os/$ARCHTARBALL
+
+# the following installation instructions are taken from
+# https://archlinuxarm.org/platforms/armv7/arm/versatile-express
+dd if=/dev/zero of=$_loopdev bs=1M count=8
+parted -s $_loopdev \
+  mklabel gpt \
+  mkpart ESP fat32 1MiB 513MiB \
+  set 1 boot on \
+  mkpart primary ext4 513MiB 100%
+mkfs.vfat -F 32 ${_loopdev}p1
+mkdir -p $_builddir/boot
+mount ${_loopdev}p1 $_builddir/boot
+mkfs.ext4 ${_loopdev}p2
+mkdir $_builddir/root
+mount ${_loopdev}p2 $_builddir/root
+bsdtar -vxpf $ARCHTARBALL -C $_builddir/root
+sync
+mv -v $_builddir/root/boot/* $_builddir/boot
+cat >> $_builddir/root/etc/fstab << EOF
+/dev/mmcblk0p1  /boot   vfat    defaults        0       0
+EOF
+
+# create and install root ssh keys for access
+mkdir -p keys
+test -f keys/id_rsa || ssh-keygen -N '' -f keys/id_rsa
+chown $(logname) keys/id_rsa*
+mkdir -m 700 $_builddir/root/root/.ssh
+install -m 600 -o 0 -g 0 keys/id_rsa.pub $_builddir/root/root/.ssh/authorized_keys
+
+# create and install ssh host keys
+for cipher in dsa ecdsa ed25519 rsa; do
+  if [ ! -f keys/ssh_host_${cipher}_key ]; then
+    ssh-keygen -N '' -t ${cipher} -f keys/ssh_host_${cipher}_key
+  fi
+  install -m 600 -o 0 -g 0 keys/ssh_host_${cipher}_key $_builddir/root/etc/ssh
+  install -m 644 -o 0 -g 0 keys/ssh_host_${cipher}_key.pub $_builddir/root/etc/ssh
+done
+
+# tie up any loose ends
+for part in p1 p2; do
+  umount $_loopdev$part
+done
+losetup -d $_loopdev
+rm -rf $_builddir/boot $_builddir/root
diff --git a/src/stage2.sh b/src/stage2.sh
new file mode 100755
index 0000000..ddc01b4
--- /dev/null
+++ b/src/stage2.sh
@@ -0,0 +1,98 @@
+#!/bin/bash
+
+set -eu
+
+_scriptfile=$_builddir/migrate.sh
+_pidfile=$_builddir/qemu.pid
+
+_loopdev=$(sudo losetup -f --show $_outfile)
+_bootdir=.boot
+
+# register cleanup handler to stop the started VM
+function cleanup {
+  test -f $_pidfile && (kill -9 $(cat $_pidfile) || true)
+  rm -f $_pidfile
+  umount ${_loopdev}p1
+  losetup -d $_loopdev
+  rm -rf $_bootdir
+  rm -f $_scriptfile
+}
+trap cleanup ERR
+
+# create the migration script, adapted from
+# https://wiki.parabola.nu/Migration_from_Arch_ARM
+cat > $_scriptfile << 'EOF'
+#!/bin/bash
+
+set -eu
+
+sed -i 's/^SigLevel.*/SigLevel = Never/' /etc/pacman.conf
+
+pacman --noconfirm -U https://www.parabola.nu/packages/libre/any/parabola-keyring/download/
+pacman --noconfirm -U https://www.parabola.nu/packages/libre/any/archlinux32-keyring/download/
+pacman --noconfirm -U https://www.parabola.nu/packages/core/any/archlinux-keyring/download/
+pacman --noconfirm -U https://www.parabola.nu/packages/libre/any/pacman-mirrorlist/download/
+pacman --noconfirm -S archlinuxarm-keyring
+
+sed -i 's/^SigLevel.*/SigLevel = Required DatabaseOptional/' /etc/pacman.conf
+
+pacman-key --init
+pacman-key --populate archlinuxarm archlinux archlinux32 parabola
+
+test -f /etc/pacman.d/mirrorlist.pacnew && mv /etc/pacman.d/mirrorlist{.pacnew,}
+
+sed -i '/^\[core\]/i \
+[libre] \
+Include = /etc/pacman.d/mirrorlist \
+' /etc/pacman.conf
+sed -Ei '/^\[alarm\]|\[aur\]/,+2d' /etc/pacman.conf
+
+yes | pacman -Scc
+
+sed -i 's/^Architecture.*/Architecture = armv7h/' /etc/pacman.conf
+
+pacman --noconfirm -Syy
+
+pacman --noconfirm -S pacman
+mv /etc/pacman.conf{.pacnew,}
+pacman --noconfirm -Syuu
+
+pacman --noconfirm -S your-freedom
+EOF
+chmod +x $_scriptfile
+
+# start the VM
+mkdir -p $_bootdir
+mount ${_loopdev}p1 $_bootdir
+QEMU_AUDIO_DRV=none qemu-system-arm \
+  -M vexpress-a9 \
+  -m 1G \
+  -dtb $_bootdir/dtbs/vexpress-v2p-ca9.dtb \
+  -kernel $_bootdir/zImage \
+  --append "root=/dev/mmcblk0p2 rw roottype=ext4 console=ttyAMA0" \
+  -drive if=sd,driver=raw,cache=writeback,file=$_outfile \
+  -display none \
+  -net user,hostfwd=tcp::2022-:22 \
+  -net nic \
+  -daemonize \
+  -pidfile $_pidfile
+
+# wait for ssh to be up
+while ! ssh -p 2022 -i keys/id_rsa root@localhost -o StrictHostKeyChecking=no true 2>/dev/null; do
+  echo -n . && sleep 5
+done && echo
+
+# copy and execute the migration script
+scp -P 2022 -i keys/id_rsa $_scriptfile root@localhost:
+ssh -p 2022 -i keys/id_rsa root@localhost "./$(basename $_scriptfile)"
+
+# stop the VM
+ssh -p 2022 -i keys/id_rsa root@localhost "nohup shutdown -h now &>/dev/null & exit"
+while kill -0 $(cat $_pidfile) 2> /dev/null; do echo -n . && sleep 5; done && echo
+rm -f $_pidfile
+
+# cleanup
+umount ${_loopdev}p1
+losetup -d $_loopdev
+rm -rf $_bootdir
+rm $_scriptfile
diff --git a/start.sh b/start.sh
index 8e1bcfb..1d967e1 100755
--- a/start.sh
+++ b/start.sh
@@ -1,25 +1,59 @@
 #!/bin/bash
 
-IMAGE=${IMAGE:-armv7h.raw}
+set -eu
 
-_loopdev=$(sudo losetup -f --show $IMAGE)
+
+_builddir=build
+mkdir -p $_builddir
+
+_imagefile=$1
+_pidfile=$_builddir/qemu.pid
+
+_loopdev=$(sudo losetup -f --show $_imagefile)
 _bootdir=.boot
 
+# register a cleanup error handler
 function cleanup {
+  test -f $_pidfile && (sudo kill -9 $(cat $_pidfile) || true)
+  rm -f $_pidfile
   sudo umount ${_loopdev}p1
   sudo losetup -d $_loopdev
   rm -rf $_bootdir
 }
-trap cleanup EXIT
+trap cleanup ERR
 
+# start the VM
 mkdir -p $_bootdir
 sudo mount ${_loopdev}p1 $_bootdir
-
-qemu-system-arm \
+QEMU_AUDIO_DRV=none qemu-system-arm \
   -M vexpress-a9 \
+  -m 1G \
   -dtb $_bootdir/dtbs/vexpress-v2p-ca9.dtb \
   -kernel $_bootdir/zImage \
   --append "root=/dev/mmcblk0p2 rw roottype=ext4 console=ttyAMA0" \
-  -drive if=sd,driver=raw,cache=writeback,file=$IMAGE \
-  --nographic \
-  -snapshot
+  -drive if=sd,driver=raw,cache=writeback,file=$_imagefile \
+  -display none \
+  -net user,hostfwd=tcp::2022-:22 \
+  -net nic \
+  -daemonize \
+  -snapshot \
+  -pidfile $_pidfile
+
+# wait for ssh to be up
+_sshopts="-o StrictHostKeyChecking=no -o ConnectTimeout=5"
+while ! ssh -p 2022 -i keys/id_rsa root@localhost $_sshopts true 2>/dev/null; do
+  echo -n . && sleep 5
+done && echo
+
+# open a session
+ssh -p 2022 -i keys/id_rsa root@localhost
+
+# shutdown the VM
+ssh -p 2022 -i keys/id_rsa root@localhost "nohup shutdown -h now &>/dev/null & exit"
+while sudo kill -0 $(cat $_pidfile) 2> /dev/null; do echo -n . && sleep 5; done && echo
+rm -f $_pidfile
+
+# cleanup
+sudo umount ${_loopdev}p1
+sudo losetup -d $_loopdev
+rm -rf $_bootdir