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{
fetchurl,
writeText,
libguestfs-with-appliance-nix,
pkgsCross,
qemu,
runCommand,
cpio,
writeShellApplication,
sshPassword,
sshPort,
httpPort,
writeScript,
}:
let
updateName = "remarkable-production-image-3.27.1.0-rm2-public";
updateArchive = fetchurl {
url =
# TODO: this is not an official source. might be worth authenticating the updates
"https://remarkable-software.s3.us-east-2.amazonaws.com/${updateName}.swu";
hash = "sha256-QPS2n/S1RqkXe0Tg8bAODnvcG5aUOYsAtPvKYwEYGsI=";
};
xochitlConfig = writeText "xochitl.conf" ''
[General]
DeveloperPassword=${sshPassword}
AirplaneMode=true
WebInterfaceEnabled=true
IdleSuspendDelay=0
SuspendPowerOffDelay=0
'';
usbMacAddr = "52:54:00:12:34:56";
ifnameUdevRule = writeText "70-persistent-net.rules" ''
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", \
ATTR{address}=="${usbMacAddr}", \
ATTR{type}=="1", KERNEL=="eth*", NAME="usb0"
'';
mmcSymlinkUdevRule = writeText "" ''
ACTION=="add", KERNEL=="vda", SYMLINK+="mmcblk2"
ACTION=="add", KERNEL=="vda[0-9]", SYMLINK+="mmcblk2p%n"
'';
usbNetworkConfig = writeText "10-usb.network" ''
[Match]
Name=usb*
[Network]
DHCP=yes
'';
usbWaitOnlineService = writeText "usb0-wait-online.service" ''
[Unit]
Description=Wait for usb0 to be routable
Before=network-online.target
[Service]
Type=oneshot
ExecStart=/bin/sh -c 'until ip -4 addr show usb0 | grep -q "inet "; do sleep 1; done'
RemainAfterExit=yes
[Install]
WantedBy=network-online.target
'';
xochitlService = writeText "xochitl.service" ''
[Unit]
Description=reMarkable main application
DefaultDependencies=no
Conflicts=shutdown.target
Before=shutdown.target
# add network-online.target to the original dependencies so that xochitl
# can bind to the usb0 interface when it starts
Wants=rm-sync.service network-online.target
After=var-lib-uboot.mount dbus.socket network-online.target
Requires=dbus.socket
[Service]
ExecStart=/usr/bin/xochitl --system
Restart=on-failure
NotifyAccess=all
# required to make xochitl run
Environment=LD_PRELOAD=/usr/lib/libfakefbdev.so
[Install]
WantedBy=multi-user.target
'';
fakefbdev = pkgsCross.armv7l-hf-multiplatform.stdenv.mkDerivation {
name = "fakefbdev";
src = ./fakefbdev;
installFlags = [ "DESTDIR=${placeholder "out"}" ];
};
doNothing = writeScript "do-nothing" ''
#!/bin/sh
'';
kernel = pkgsCross.armv7l-hf-multiplatform.linux;
rootfsImage = runCommand "rm-rootfs.ext4" { nativeBuildInputs = [ cpio ]; } ''
cpio -i --file ${updateArchive}
gzip -dc ${updateName}.ext4.gz > $out
'';
diskImage =
runCommand "rm-disk.qcow2"
{
nativeBuildInputs = [
qemu
libguestfs-with-appliance-nix
];
}
''
qemu-img create -f qcow2 $out 8G
guestfish --rw --blocksize=512 --add $out <<EOF
run
# not the original partition table of the RM2, sizes differ
part-init /dev/sda gpt
part-add /dev/sda p 2048 2099199
part-add /dev/sda p 2099200 10487807
part-add /dev/sda p 10487808 12584959
part-add /dev/sda p 12584960 16775167
mkfs vfat /dev/sda1
upload ${rootfsImage} /dev/sda2
resize2fs /dev/sda2
# we disable the orphan_file feature to avoid the error
# 'unsupported feature(s): FEATURE_C12' when e2fsck runs at boot
mkfs ext4 /dev/sda4 features:^orphan_file
mount /dev/sda2 /
download /etc/fstab fstab
! sed -i /unknown/d fstab
upload fstab /etc/fstab
copy-in ${kernel.modules}/lib/modules /usr/lib
upload ${ifnameUdevRule} /etc/udev/rules.d/70-persistent-net.rules
upload ${mmcSymlinkUdevRule} /etc/udev/rules.d/70-mmc-symlinks.rules
upload ${usbNetworkConfig} /etc/systemd/network/10-usb.network
upload ${xochitlService} /usr/lib/systemd/system/xochitl.service
upload ${usbWaitOnlineService} /etc/systemd/system/usb0-wait-online.service
mkdir-p /etc/systemd/system/network-online.target.wants
ln-s /etc/systemd/system/usb0-wait-online.service /etc/systemd/system/network-online.target.wants/usb0-wait-online.service
# delete any systemd units that hinder or delay startup
rm /usr/lib/systemd/system/wacom_flash.service
rm /usr/lib/systemd/system/memfaultd.service
rm /usr/lib/systemd/system/memfault-attributes.service
rm /usr/lib/systemd/system/swupdate.service
rm /usr/lib/systemd/system/swupdate.socket
rm /usr/lib/systemd/system/system-hardening.service
rm /usr/lib/systemd/system/wpa_supplicant.service
# stub the usb-ether-once script
upload ${doNothing} /usr/sbin/usb-ether-once
chmod 0755 /usr/sbin/usb-ether-once
upload ${fakefbdev}/lib/libfakefbdev.so /usr/lib/libfakefbdev.so
chmod 0755 /usr/lib/libfakefbdev.so
mount /dev/sda4 /home
cp-a /etc/skel /home/root
mkdir-p /home/root/.local/share/remarkable/xochitl
mkdir-p /home/root/.config/remarkable
upload ${xochitlConfig} /home/root/.config/remarkable/xochitl.conf
EOF
'';
in
writeShellApplication {
name = "reMder-server";
runtimeInputs = [ qemu ];
text = ''
rm -f ./reMder.qcow2
qemu-img create -b ${diskImage} -F qcow2 -f qcow2 ./reMder.qcow2
qemu-system-aarch64 \
-machine virt \
-m 2048 \
-kernel ${kernel}/zImage \
-drive if=none,file=./reMder.qcow2,format=qcow2,id=hd \
-device virtio-blk-device,drive=hd \
-netdev user,net=10.11.99.0/27,host=10.11.99.2,dhcpstart=10.11.99.1,hostfwd=tcp::${toString sshPort}-:22,hostfwd=tcp::${toString httpPort}-:80,id=net \
-device virtio-net-device,netdev=net,mac=${usbMacAddr} \
-append "console=ttyAMA0 rootfstype=ext4 root=/dev/vda2 rw rootwait init=/sbin/init" \
-serial mon:stdio \
-nographic
'';
}
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